drivers/usb/core/devio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      devio.c  --  User space communication with USB devices.
   6  *
   7  *      Copyright (C) 1999-2000  Thomas Sailer ([email protected])
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/usb/quirks.h>
  36 #include <linux/cdev.h>
  37 #include <linux/notifier.h>
  38 #include <linux/security.h>
  39 #include <linux/user_namespace.h>
  40 #include <linux/scatterlist.h>
  41 #include <linux/uaccess.h>
  42 #include <linux/dma-mapping.h>
  43 #include <asm/byteorder.h>
  44 #include <linux/moduleparam.h>
  45
  46 #include "usb.h"
  47
  48 #ifdef CONFIG_PM
  49 #define MAYBE_CAP_SUSPEND       USBDEVFS_CAP_SUSPEND
  50 #else
  51 #define MAYBE_CAP_SUSPEND       0
  52 #endif
  53
  54 #define USB_MAXBUS                      64
  55 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  56 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  57
  58 /* Mutual exclusion for ps->list in resume vs. release and remove */
  59 static DEFINE_MUTEX(usbfs_mutex);
  60
  61 struct usb_dev_state {
  62         struct list_head list;      /* state list */
  63         struct usb_device *dev;
  64         struct file *file;
  65         spinlock_t lock;            /* protects the async urb lists */
  66         struct list_head async_pending;
  67         struct list_head async_completed;
  68         struct list_head memory_list;
  69         wait_queue_head_t wait;     /* wake up if a request completed */
  70         wait_queue_head_t wait_for_resume;   /* wake up upon runtime resume */
  71         unsigned int discsignr;
  72         struct pid *disc_pid;
  73         const struct cred *cred;
  74         sigval_t disccontext;
  75         unsigned long ifclaimed;
  76         u32 disabled_bulk_eps;
  77         unsigned long interface_allowed_mask;
  78         int not_yet_resumed;
  79         bool suspend_allowed;
  80         bool privileges_dropped;
  81 };
  82
  83 struct usb_memory {
  84         struct list_head memlist;
  85         int vma_use_count;
  86         int urb_use_count;
  87         u32 size;
  88         void *mem;
  89         dma_addr_t dma_handle;
  90         unsigned long vm_start;
  91         struct usb_dev_state *ps;
  92 };
  93
  94 struct async {
  95         struct list_head asynclist;
  96         struct usb_dev_state *ps;
  97         struct pid *pid;
  98         const struct cred *cred;
  99         unsigned int signr;
 100         unsigned int ifnum;
 101         void __user *userbuffer;
 102         void __user *userurb;
 103         sigval_t userurb_sigval;
 104         struct urb *urb;
 105         struct usb_memory *usbm;
 106         unsigned int mem_usage;
 107         int status;
 108         u8 bulk_addr;
 109         u8 bulk_status;
 110 };
 111
 112 static bool usbfs_snoop;
 113 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 114 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 115
 116 static unsigned usbfs_snoop_max = 65536;
 117 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 118 MODULE_PARM_DESC(usbfs_snoop_max,
 119                 "maximum number of bytes to print while snooping");
 120
 121 #define snoop(dev, format, arg...)                              \
 122         do {                                                    \
 123                 if (usbfs_snoop)                                \
 124                         dev_info(dev, format, ## arg);          \
 125         } while (0)
 126
 127 enum snoop_when {
 128         SUBMIT, COMPLETE
 129 };
 130
 131 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 132
 133 /* Limit on the total amount of memory we can allocate for transfers */
 134 static u32 usbfs_memory_mb = 16;
 135 module_param(usbfs_memory_mb, uint, 0644);
 136 MODULE_PARM_DESC(usbfs_memory_mb,
 137                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 138
 139 /* Hard limit, necessary to avoid arithmetic overflow */
 140 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 141
 142 static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
 143 static u64 usbfs_memory_usage;  /* Total memory currently allocated */
 144
 145 /* Check whether it's okay to allocate more memory for a transfer */
 146 static int usbfs_increase_memory_usage(u64 amount)
 147 {
 148         u64 lim, total_mem;
 149         unsigned long flags;
 150         int ret;
 151
 152         lim = READ_ONCE(usbfs_memory_mb);
 153         lim <<= 20;
 154
 155         ret = 0;
 156         spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
 157         total_mem = usbfs_memory_usage + amount;
 158         if (lim > 0 && total_mem > lim)
 159                 ret = -ENOMEM;
 160         else
 161                 usbfs_memory_usage = total_mem;
 162         spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
 163
 164         return ret;
 165 }
 166
 167 /* Memory for a transfer is being deallocated */
 168 static void usbfs_decrease_memory_usage(u64 amount)
 169 {
 170         unsigned long flags;
 171
 172         spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
 173         if (amount > usbfs_memory_usage)
 174                 usbfs_memory_usage = 0;
 175         else
 176                 usbfs_memory_usage -= amount;
 177         spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
 178 }
 179
 180 static int connected(struct usb_dev_state *ps)
 181 {
 182         return (!list_empty(&ps->list) &&
 183                         ps->dev->state != USB_STATE_NOTATTACHED);
 184 }
 185
 186 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 187 {
 188         struct usb_dev_state *ps = usbm->ps;
 189         unsigned long flags;
 190
 191         spin_lock_irqsave(&ps->lock, flags);
 192         --*count;
 193         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 194                 list_del(&usbm->memlist);
 195                 spin_unlock_irqrestore(&ps->lock, flags);
 196
 197                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 198                                 usbm->dma_handle);
 199                 usbfs_decrease_memory_usage(
 200                         usbm->size + sizeof(struct usb_memory));
 201                 kfree(usbm);
 202         } else {
 203                 spin_unlock_irqrestore(&ps->lock, flags);
 204         }
 205 }
 206
 207 static void usbdev_vm_open(struct vm_area_struct *vma)
 208 {
 209         struct usb_memory *usbm = vma->vm_private_data;
 210         unsigned long flags;
 211
 212         spin_lock_irqsave(&usbm->ps->lock, flags);
 213         ++usbm->vma_use_count;
 214         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 215 }
 216
 217 static void usbdev_vm_close(struct vm_area_struct *vma)
 218 {
 219         struct usb_memory *usbm = vma->vm_private_data;
 220
 221         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 222 }
 223
 224 static const struct vm_operations_struct usbdev_vm_ops = {
 225         .open = usbdev_vm_open,
 226         .close = usbdev_vm_close
 227 };
 228
 229 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 230 {
 231         struct usb_memory *usbm = NULL;
 232         struct usb_dev_state *ps = file->private_data;
 233         struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
 234         size_t size = vma->vm_end - vma->vm_start;
 235         void *mem;
 236         unsigned long flags;
 237         dma_addr_t dma_handle;
 238         int ret;
 239
 240         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 241         if (ret)
 242                 goto error;
 243
 244         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 245         if (!usbm) {
 246                 ret = -ENOMEM;
 247                 goto error_decrease_mem;
 248         }
 249
 250         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 251                         &dma_handle);
 252         if (!mem) {
 253                 ret = -ENOMEM;
 254                 goto error_free_usbm;
 255         }
 256
 257         memset(mem, 0, size);
 258
 259         usbm->mem = mem;
 260         usbm->dma_handle = dma_handle;
 261         usbm->size = size;
 262         usbm->ps = ps;
 263         usbm->vm_start = vma->vm_start;
 264         usbm->vma_use_count = 1;
 265         INIT_LIST_HEAD(&usbm->memlist);
 266
 267         if (hcd->localmem_pool || !hcd_uses_dma(hcd)) {
 268                 if (remap_pfn_range(vma, vma->vm_start,
 269                                     virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 270                                     size, vma->vm_page_prot) < 0) {
 271                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 272                         return -EAGAIN;
 273                 }
 274         } else {
 275                 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
 276                                       size)) {
 277                         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 278                         return -EAGAIN;
 279                 }
 280         }
 281
 282         vma->vm_flags |= VM_IO;
 283         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 284         vma->vm_ops = &usbdev_vm_ops;
 285         vma->vm_private_data = usbm;
 286
 287         spin_lock_irqsave(&ps->lock, flags);
 288         list_add_tail(&usbm->memlist, &ps->memory_list);
 289         spin_unlock_irqrestore(&ps->lock, flags);
 290
 291         return 0;
 292
 293 error_free_usbm:
 294         kfree(usbm);
 295 error_decrease_mem:
 296         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 297 error:
 298         return ret;
 299 }
 300
 301 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 302                            loff_t *ppos)
 303 {
 304         struct usb_dev_state *ps = file->private_data;
 305         struct usb_device *dev = ps->dev;
 306         ssize_t ret = 0;
 307         unsigned len;
 308         loff_t pos;
 309         int i;
 310
 311         pos = *ppos;
 312         usb_lock_device(dev);
 313         if (!connected(ps)) {
 314                 ret = -ENODEV;
 315                 goto err;
 316         } else if (pos < 0) {
 317                 ret = -EINVAL;
 318                 goto err;
 319         }
 320
 321         if (pos < sizeof(struct usb_device_descriptor)) {
 322                 /* 18 bytes - fits on the stack */
 323                 struct usb_device_descriptor temp_desc;
 324
 325                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 326                 le16_to_cpus(&temp_desc.bcdUSB);
 327                 le16_to_cpus(&temp_desc.idVendor);
 328                 le16_to_cpus(&temp_desc.idProduct);
 329                 le16_to_cpus(&temp_desc.bcdDevice);
 330
 331                 len = sizeof(struct usb_device_descriptor) - pos;
 332                 if (len > nbytes)
 333                         len = nbytes;
 334                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 335                         ret = -EFAULT;
 336                         goto err;
 337                 }
 338
 339                 *ppos += len;
 340                 buf += len;
 341                 nbytes -= len;
 342                 ret += len;
 343         }
 344
 345         pos = sizeof(struct usb_device_descriptor);
 346         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 347                 struct usb_config_descriptor *config =
 348                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 349                 unsigned int length = le16_to_cpu(config->wTotalLength);
 350
 351                 if (*ppos < pos + length) {
 352
 353                         /* The descriptor may claim to be longer than it
 354                          * really is.  Here is the actual allocated length. */
 355                         unsigned alloclen =
 356                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 357
 358                         len = length - (*ppos - pos);
 359                         if (len > nbytes)
 360                                 len = nbytes;
 361
 362                         /* Simply don't write (skip over) unallocated parts */
 363                         if (alloclen > (*ppos - pos)) {
 364                                 alloclen -= (*ppos - pos);
 365                                 if (copy_to_user(buf,
 366                                     dev->rawdescriptors[i] + (*ppos - pos),
 367                                     min(len, alloclen))) {
 368                                         ret = -EFAULT;
 369                                         goto err;
 370                                 }
 371                         }
 372
 373                         *ppos += len;
 374                         buf += len;
 375                         nbytes -= len;
 376                         ret += len;
 377                 }
 378
 379                 pos += length;
 380         }
 381
 382 err:
 383         usb_unlock_device(dev);
 384         return ret;
 385 }
 386
 387 /*
 388  * async list handling
 389  */
 390
 391 static struct async *alloc_async(unsigned int numisoframes)
 392 {
 393         struct async *as;
 394
 395         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 396         if (!as)
 397                 return NULL;
 398         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 399         if (!as->urb) {
 400                 kfree(as);
 401                 return NULL;
 402         }
 403         return as;
 404 }
 405
 406 static void free_async(struct async *as)
 407 {
 408         int i;
 409
 410         put_pid(as->pid);
 411         if (as->cred)
 412                 put_cred(as->cred);
 413         for (i = 0; i < as->urb->num_sgs; i++) {
 414                 if (sg_page(&as->urb->sg[i]))
 415                         kfree(sg_virt(&as->urb->sg[i]));
 416         }
 417
 418         kfree(as->urb->sg);
 419         if (as->usbm == NULL)
 420                 kfree(as->urb->transfer_buffer);
 421         else
 422                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 423
 424         kfree(as->urb->setup_packet);
 425         usb_free_urb(as->urb);
 426         usbfs_decrease_memory_usage(as->mem_usage);
 427         kfree(as);
 428 }
 429
 430 static void async_newpending(struct async *as)
 431 {
 432         struct usb_dev_state *ps = as->ps;
 433         unsigned long flags;
 434
 435         spin_lock_irqsave(&ps->lock, flags);
 436         list_add_tail(&as->asynclist, &ps->async_pending);
 437         spin_unlock_irqrestore(&ps->lock, flags);
 438 }
 439
 440 static void async_removepending(struct async *as)
 441 {
 442         struct usb_dev_state *ps = as->ps;
 443         unsigned long flags;
 444
 445         spin_lock_irqsave(&ps->lock, flags);
 446         list_del_init(&as->asynclist);
 447         spin_unlock_irqrestore(&ps->lock, flags);
 448 }
 449
 450 static struct async *async_getcompleted(struct usb_dev_state *ps)
 451 {
 452         unsigned long flags;
 453         struct async *as = NULL;
 454
 455         spin_lock_irqsave(&ps->lock, flags);
 456         if (!list_empty(&ps->async_completed)) {
 457                 as = list_entry(ps->async_completed.next, struct async,
 458                                 asynclist);
 459                 list_del_init(&as->asynclist);
 460         }
 461         spin_unlock_irqrestore(&ps->lock, flags);
 462         return as;
 463 }
 464
 465 static struct async *async_getpending(struct usb_dev_state *ps,
 466                                              void __user *userurb)
 467 {
 468         struct async *as;
 469
 470         list_for_each_entry(as, &ps->async_pending, asynclist)
 471                 if (as->userurb == userurb) {
 472                         list_del_init(&as->asynclist);
 473                         return as;
 474                 }
 475
 476         return NULL;
 477 }
 478
 479 static void snoop_urb(struct usb_device *udev,
 480                 void __user *userurb, int pipe, unsigned length,
 481                 int timeout_or_status, enum snoop_when when,
 482                 unsigned char *data, unsigned data_len)
 483 {
 484         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 485         static const char *dirs[] = {"out", "in"};
 486         int ep;
 487         const char *t, *d;
 488
 489         if (!usbfs_snoop)
 490                 return;
 491
 492         ep = usb_pipeendpoint(pipe);
 493         t = types[usb_pipetype(pipe)];
 494         d = dirs[!!usb_pipein(pipe)];
 495
 496         if (userurb) {          /* Async */
 497                 if (when == SUBMIT)
 498                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 499                                         "length %u\n",
 500                                         userurb, ep, t, d, length);
 501                 else
 502                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 503                                         "actual_length %u status %d\n",
 504                                         userurb, ep, t, d, length,
 505                                         timeout_or_status);
 506         } else {
 507                 if (when == SUBMIT)
 508                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 509                                         "timeout %d\n",
 510                                         ep, t, d, length, timeout_or_status);
 511                 else
 512                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 513                                         "status %d\n",
 514                                         ep, t, d, length, timeout_or_status);
 515         }
 516
 517         data_len = min(data_len, usbfs_snoop_max);
 518         if (data && data_len > 0) {
 519                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 520                         data, data_len, 1);
 521         }
 522 }
 523
 524 static void snoop_urb_data(struct urb *urb, unsigned len)
 525 {
 526         int i, size;
 527
 528         len = min(len, usbfs_snoop_max);
 529         if (!usbfs_snoop || len == 0)
 530                 return;
 531
 532         if (urb->num_sgs == 0) {
 533                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 534                         urb->transfer_buffer, len, 1);
 535                 return;
 536         }
 537
 538         for (i = 0; i < urb->num_sgs && len; i++) {
 539                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 540                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 541                         sg_virt(&urb->sg[i]), size, 1);
 542                 len -= size;
 543         }
 544 }
 545
 546 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 547 {
 548         unsigned i, len, size;
 549
 550         if (urb->number_of_packets > 0)         /* Isochronous */
 551                 len = urb->transfer_buffer_length;
 552         else                                    /* Non-Isoc */
 553                 len = urb->actual_length;
 554
 555         if (urb->num_sgs == 0) {
 556                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 557                         return -EFAULT;
 558                 return 0;
 559         }
 560
 561         for (i = 0; i < urb->num_sgs && len; i++) {
 562                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 563                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 564                         return -EFAULT;
 565                 userbuffer += size;
 566                 len -= size;
 567         }
 568
 569         return 0;
 570 }
 571
 572 #define AS_CONTINUATION 1
 573 #define AS_UNLINK       2
 574
 575 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 576 __releases(ps->lock)
 577 __acquires(ps->lock)
 578 {
 579         struct urb *urb;
 580         struct async *as;
 581
 582         /* Mark all the pending URBs that match bulk_addr, up to but not
 583          * including the first one without AS_CONTINUATION.  If such an
 584          * URB is encountered then a new transfer has already started so
 585          * the endpoint doesn't need to be disabled; otherwise it does.
 586          */
 587         list_for_each_entry(as, &ps->async_pending, asynclist) {
 588                 if (as->bulk_addr == bulk_addr) {
 589                         if (as->bulk_status != AS_CONTINUATION)
 590                                 goto rescan;
 591                         as->bulk_status = AS_UNLINK;
 592                         as->bulk_addr = 0;
 593                 }
 594         }
 595         ps->disabled_bulk_eps |= (1 << bulk_addr);
 596
 597         /* Now carefully unlink all the marked pending URBs */
 598  rescan:
 599         list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
 600                 if (as->bulk_status == AS_UNLINK) {
 601                         as->bulk_status = 0;            /* Only once */
 602                         urb = as->urb;
 603                         usb_get_urb(urb);
 604                         spin_unlock(&ps->lock);         /* Allow completions */
 605                         usb_unlink_urb(urb);
 606                         usb_put_urb(urb);
 607                         spin_lock(&ps->lock);
 608                         goto rescan;
 609                 }
 610         }
 611 }
 612
 613 static void async_completed(struct urb *urb)
 614 {
 615         struct async *as = urb->context;
 616         struct usb_dev_state *ps = as->ps;
 617         struct pid *pid = NULL;
 618         const struct cred *cred = NULL;
 619         unsigned long flags;
 620         sigval_t addr;
 621         int signr, errno;
 622
 623         spin_lock_irqsave(&ps->lock, flags);
 624         list_move_tail(&as->asynclist, &ps->async_completed);
 625         as->status = urb->status;
 626         signr = as->signr;
 627         if (signr) {
 628                 errno = as->status;
 629                 addr = as->userurb_sigval;
 630                 pid = get_pid(as->pid);
 631                 cred = get_cred(as->cred);
 632         }
 633         snoop(&urb->dev->dev, "urb complete\n");
 634         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 635                         as->status, COMPLETE, NULL, 0);
 636         if (usb_urb_dir_in(urb))
 637                 snoop_urb_data(urb, urb->actual_length);
 638
 639         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 640                         as->status != -ENOENT)
 641                 cancel_bulk_urbs(ps, as->bulk_addr);
 642
 643         wake_up(&ps->wait);
 644         spin_unlock_irqrestore(&ps->lock, flags);
 645
 646         if (signr) {
 647                 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
 648                 put_pid(pid);
 649                 put_cred(cred);
 650         }
 651 }
 652
 653 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 654 {
 655         struct urb *urb;
 656         struct async *as;
 657         unsigned long flags;
 658
 659         spin_lock_irqsave(&ps->lock, flags);
 660         while (!list_empty(list)) {
 661                 as = list_last_entry(list, struct async, asynclist);
 662                 list_del_init(&as->asynclist);
 663                 urb = as->urb;
 664                 usb_get_urb(urb);
 665
 666                 /* drop the spinlock so the completion handler can run */
 667                 spin_unlock_irqrestore(&ps->lock, flags);
 668                 usb_kill_urb(urb);
 669                 usb_put_urb(urb);
 670                 spin_lock_irqsave(&ps->lock, flags);
 671         }
 672         spin_unlock_irqrestore(&ps->lock, flags);
 673 }
 674
 675 static void destroy_async_on_interface(struct usb_dev_state *ps,
 676                                        unsigned int ifnum)
 677 {
 678         struct list_head *p, *q, hitlist;
 679         unsigned long flags;
 680
 681         INIT_LIST_HEAD(&hitlist);
 682         spin_lock_irqsave(&ps->lock, flags);
 683         list_for_each_safe(p, q, &ps->async_pending)
 684                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 685                         list_move_tail(p, &hitlist);
 686         spin_unlock_irqrestore(&ps->lock, flags);
 687         destroy_async(ps, &hitlist);
 688 }
 689
 690 static void destroy_all_async(struct usb_dev_state *ps)
 691 {
 692         destroy_async(ps, &ps->async_pending);
 693 }
 694
 695 /*
 696  * interface claims are made only at the request of user level code,
 697  * which can also release them (explicitly or by closing files).
 698  * they're also undone when devices disconnect.
 699  */
 700
 701 static int driver_probe(struct usb_interface *intf,
 702                         const struct usb_device_id *id)
 703 {
 704         return -ENODEV;
 705 }
 706
 707 static void driver_disconnect(struct usb_interface *intf)
 708 {
 709         struct usb_dev_state *ps = usb_get_intfdata(intf);
 710         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 711
 712         if (!ps)
 713                 return;
 714
 715         /* NOTE:  this relies on usbcore having canceled and completed
 716          * all pending I/O requests; 2.6 does that.
 717          */
 718
 719         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 720                 clear_bit(ifnum, &ps->ifclaimed);
 721         else
 722                 dev_warn(&intf->dev, "interface number %u out of range\n",
 723                          ifnum);
 724
 725         usb_set_intfdata(intf, NULL);
 726
 727         /* force async requests to complete */
 728         destroy_async_on_interface(ps, ifnum);
 729 }
 730
 731 /* We don't care about suspend/resume of claimed interfaces */
 732 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 733 {
 734         return 0;
 735 }
 736
 737 static int driver_resume(struct usb_interface *intf)
 738 {
 739         return 0;
 740 }
 741
 742 /* The following routines apply to the entire device, not interfaces */
 743 void usbfs_notify_suspend(struct usb_device *udev)
 744 {
 745         /* We don't need to handle this */
 746 }
 747
 748 void usbfs_notify_resume(struct usb_device *udev)
 749 {
 750         struct usb_dev_state *ps;
 751
 752         /* Protect against simultaneous remove or release */
 753         mutex_lock(&usbfs_mutex);
 754         list_for_each_entry(ps, &udev->filelist, list) {
 755                 WRITE_ONCE(ps->not_yet_resumed, 0);
 756                 wake_up_all(&ps->wait_for_resume);
 757         }
 758         mutex_unlock(&usbfs_mutex);
 759 }
 760
 761 struct usb_driver usbfs_driver = {
 762         .name =         "usbfs",
 763         .probe =        driver_probe,
 764         .disconnect =   driver_disconnect,
 765         .suspend =      driver_suspend,
 766         .resume =       driver_resume,
 767         .supports_autosuspend = 1,
 768 };
 769
 770 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 771 {
 772         struct usb_device *dev = ps->dev;
 773         struct usb_interface *intf;
 774         int err;
 775
 776         if (ifnum >= 8*sizeof(ps->ifclaimed))
 777                 return -EINVAL;
 778         /* already claimed */
 779         if (test_bit(ifnum, &ps->ifclaimed))
 780                 return 0;
 781
 782         if (ps->privileges_dropped &&
 783                         !test_bit(ifnum, &ps->interface_allowed_mask))
 784                 return -EACCES;
 785
 786         intf = usb_ifnum_to_if(dev, ifnum);
 787         if (!intf)
 788                 err = -ENOENT;
 789         else {
 790                 unsigned int old_suppress;
 791
 792                 /* suppress uevents while claiming interface */
 793                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 794                 dev_set_uevent_suppress(&intf->dev, 1);
 795                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 796                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 797         }
 798         if (err == 0)
 799                 set_bit(ifnum, &ps->ifclaimed);
 800         return err;
 801 }
 802
 803 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 804 {
 805         struct usb_device *dev;
 806         struct usb_interface *intf;
 807         int err;
 808
 809         err = -EINVAL;
 810         if (ifnum >= 8*sizeof(ps->ifclaimed))
 811                 return err;
 812         dev = ps->dev;
 813         intf = usb_ifnum_to_if(dev, ifnum);
 814         if (!intf)
 815                 err = -ENOENT;
 816         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 817                 unsigned int old_suppress;
 818
 819                 /* suppress uevents while releasing interface */
 820                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 821                 dev_set_uevent_suppress(&intf->dev, 1);
 822                 usb_driver_release_interface(&usbfs_driver, intf);
 823                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 824                 err = 0;
 825         }
 826         return err;
 827 }
 828
 829 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 830 {
 831         if (ps->dev->state != USB_STATE_CONFIGURED)
 832                 return -EHOSTUNREACH;
 833         if (ifnum >= 8*sizeof(ps->ifclaimed))
 834                 return -EINVAL;
 835         if (test_bit(ifnum, &ps->ifclaimed))
 836                 return 0;
 837         /* if not yet claimed, claim it for the driver */
 838         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 839                  "interface %u before use\n", task_pid_nr(current),
 840                  current->comm, ifnum);
 841         return claimintf(ps, ifnum);
 842 }
 843
 844 static int findintfep(struct usb_device *dev, unsigned int ep)
 845 {
 846         unsigned int i, j, e;
 847         struct usb_interface *intf;
 848         struct usb_host_interface *alts;
 849         struct usb_endpoint_descriptor *endpt;
 850
 851         if (ep & ~(USB_DIR_IN|0xf))
 852                 return -EINVAL;
 853         if (!dev->actconfig)
 854                 return -ESRCH;
 855         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 856                 intf = dev->actconfig->interface[i];
 857                 for (j = 0; j < intf->num_altsetting; j++) {
 858                         alts = &intf->altsetting[j];
 859                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 860                                 endpt = &alts->endpoint[e].desc;
 861                                 if (endpt->bEndpointAddress == ep)
 862                                         return alts->desc.bInterfaceNumber;
 863                         }
 864                 }
 865         }
 866         return -ENOENT;
 867 }
 868
 869 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 870                            unsigned int request, unsigned int index)
 871 {
 872         int ret = 0;
 873         struct usb_host_interface *alt_setting;
 874
 875         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 876          && ps->dev->state != USB_STATE_ADDRESS
 877          && ps->dev->state != USB_STATE_CONFIGURED)
 878                 return -EHOSTUNREACH;
 879         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 880                 return 0;
 881
 882         /*
 883          * check for the special corner case 'get_device_id' in the printer
 884          * class specification, which we always want to allow as it is used
 885          * to query things like ink level, etc.
 886          */
 887         if (requesttype == 0xa1 && request == 0) {
 888                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 889                                                    index >> 8, index & 0xff);
 890                 if (alt_setting
 891                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 892                         return 0;
 893         }
 894
 895         index &= 0xff;
 896         switch (requesttype & USB_RECIP_MASK) {
 897         case USB_RECIP_ENDPOINT:
 898                 if ((index & ~USB_DIR_IN) == 0)
 899                         return 0;
 900                 ret = findintfep(ps->dev, index);
 901                 if (ret < 0) {
 902                         /*
 903                          * Some not fully compliant Win apps seem to get
 904                          * index wrong and have the endpoint number here
 905                          * rather than the endpoint address (with the
 906                          * correct direction). Win does let this through,
 907                          * so we'll not reject it here but leave it to
 908                          * the device to not break KVM. But we warn.
 909                          */
 910                         ret = findintfep(ps->dev, index ^ 0x80);
 911                         if (ret >= 0)
 912                                 dev_info(&ps->dev->dev,
 913                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 914                                         __func__, task_pid_nr(current),
 915                                         current->comm, index, index ^ 0x80);
 916                 }
 917                 if (ret >= 0)
 918                         ret = checkintf(ps, ret);
 919                 break;
 920
 921         case USB_RECIP_INTERFACE:
 922                 ret = checkintf(ps, index);
 923                 break;
 924         }
 925         return ret;
 926 }
 927
 928 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 929                                                      unsigned char ep)
 930 {
 931         if (ep & USB_ENDPOINT_DIR_MASK)
 932                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 933         else
 934                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 935 }
 936
 937 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 938                                   struct usbdevfs_streams __user *streams,
 939                                   unsigned int *num_streams_ret,
 940                                   unsigned int *num_eps_ret,
 941                                   struct usb_host_endpoint ***eps_ret,
 942                                   struct usb_interface **intf_ret)
 943 {
 944         unsigned int i, num_streams, num_eps;
 945         struct usb_host_endpoint **eps;
 946         struct usb_interface *intf = NULL;
 947         unsigned char ep;
 948         int ifnum, ret;
 949
 950         if (get_user(num_streams, &streams->num_streams) ||
 951             get_user(num_eps, &streams->num_eps))
 952                 return -EFAULT;
 953
 954         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 955                 return -EINVAL;
 956
 957         /* The XHCI controller allows max 2 ^ 16 streams */
 958         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 959                 return -EINVAL;
 960
 961         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 962         if (!eps)
 963                 return -ENOMEM;
 964
 965         for (i = 0; i < num_eps; i++) {
 966                 if (get_user(ep, &streams->eps[i])) {
 967                         ret = -EFAULT;
 968                         goto error;
 969                 }
 970                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 971                 if (!eps[i]) {
 972                         ret = -EINVAL;
 973                         goto error;
 974                 }
 975
 976                 /* usb_alloc/free_streams operate on an usb_interface */
 977                 ifnum = findintfep(ps->dev, ep);
 978                 if (ifnum < 0) {
 979                         ret = ifnum;
 980                         goto error;
 981                 }
 982
 983                 if (i == 0) {
 984                         ret = checkintf(ps, ifnum);
 985                         if (ret < 0)
 986                                 goto error;
 987                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 988                 } else {
 989                         /* Verify all eps belong to the same interface */
 990                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 991                                 ret = -EINVAL;
 992                                 goto error;
 993                         }
 994                 }
 995         }
 996
 997         if (num_streams_ret)
 998                 *num_streams_ret = num_streams;
 999         *num_eps_ret = num_eps;
1000         *eps_ret = eps;
1001         *intf_ret = intf;
1002
1003         return 0;
1004
1005 error:
1006         kfree(eps);
1007         return ret;
1008 }
1009
1010 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1011 {
1012         struct device *dev;
1013
1014         dev = bus_find_device_by_devt(&usb_bus_type, devt);
1015         if (!dev)
1016                 return NULL;
1017         return to_usb_device(dev);
1018 }
1019
1020 /*
1021  * file operations
1022  */
1023 static int usbdev_open(struct inode *inode, struct file *file)
1024 {
1025         struct usb_device *dev = NULL;
1026         struct usb_dev_state *ps;
1027         int ret;
1028
1029         ret = -ENOMEM;
1030         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1031         if (!ps)
1032                 goto out_free_ps;
1033
1034         ret = -ENODEV;
1035
1036         /* usbdev device-node */
1037         if (imajor(inode) == USB_DEVICE_MAJOR)
1038                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1039         if (!dev)
1040                 goto out_free_ps;
1041
1042         usb_lock_device(dev);
1043         if (dev->state == USB_STATE_NOTATTACHED)
1044                 goto out_unlock_device;
1045
1046         ret = usb_autoresume_device(dev);
1047         if (ret)
1048                 goto out_unlock_device;
1049
1050         ps->dev = dev;
1051         ps->file = file;
1052         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1053         spin_lock_init(&ps->lock);
1054         INIT_LIST_HEAD(&ps->list);
1055         INIT_LIST_HEAD(&ps->async_pending);
1056         INIT_LIST_HEAD(&ps->async_completed);
1057         INIT_LIST_HEAD(&ps->memory_list);
1058         init_waitqueue_head(&ps->wait);
1059         init_waitqueue_head(&ps->wait_for_resume);
1060         ps->disc_pid = get_pid(task_pid(current));
1061         ps->cred = get_current_cred();
1062         smp_wmb();
1063
1064         /* Can't race with resume; the device is already active */
1065         list_add_tail(&ps->list, &dev->filelist);
1066         file->private_data = ps;
1067         usb_unlock_device(dev);
1068         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1069                         current->comm);
1070         return ret;
1071
1072  out_unlock_device:
1073         usb_unlock_device(dev);
1074         usb_put_dev(dev);
1075  out_free_ps:
1076         kfree(ps);
1077         return ret;
1078 }
1079
1080 static int usbdev_release(struct inode *inode, struct file *file)
1081 {
1082         struct usb_dev_state *ps = file->private_data;
1083         struct usb_device *dev = ps->dev;
1084         unsigned int ifnum;
1085         struct async *as;
1086
1087         usb_lock_device(dev);
1088         usb_hub_release_all_ports(dev, ps);
1089
1090         /* Protect against simultaneous resume */
1091         mutex_lock(&usbfs_mutex);
1092         list_del_init(&ps->list);
1093         mutex_unlock(&usbfs_mutex);
1094
1095         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1096                         ifnum++) {
1097                 if (test_bit(ifnum, &ps->ifclaimed))
1098                         releaseintf(ps, ifnum);
1099         }
1100         destroy_all_async(ps);
1101         if (!ps->suspend_allowed)
1102                 usb_autosuspend_device(dev);
1103         usb_unlock_device(dev);
1104         usb_put_dev(dev);
1105         put_pid(ps->disc_pid);
1106         put_cred(ps->cred);
1107
1108         as = async_getcompleted(ps);
1109         while (as) {
1110                 free_async(as);
1111                 as = async_getcompleted(ps);
1112         }
1113
1114         kfree(ps);
1115         return 0;
1116 }
1117
1118 static void usbfs_blocking_completion(struct urb *urb)
1119 {
1120         complete((struct completion *) urb->context);
1121 }
1122
1123 /*
1124  * Much like usb_start_wait_urb, but returns status separately from
1125  * actual_length and uses a killable wait.
1126  */
1127 static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1128                 unsigned int *actlen)
1129 {
1130         DECLARE_COMPLETION_ONSTACK(ctx);
1131         unsigned long expire;
1132         int rc;
1133
1134         urb->context = &ctx;
1135         urb->complete = usbfs_blocking_completion;
1136         *actlen = 0;
1137         rc = usb_submit_urb(urb, GFP_KERNEL);
1138         if (unlikely(rc))
1139                 return rc;
1140
1141         expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1142         rc = wait_for_completion_killable_timeout(&ctx, expire);
1143         if (rc <= 0) {
1144                 usb_kill_urb(urb);
1145                 *actlen = urb->actual_length;
1146                 if (urb->status != -ENOENT)
1147                         ;       /* Completed before it was killed */
1148                 else if (rc < 0)
1149                         return -EINTR;
1150                 else
1151                         return -ETIMEDOUT;
1152         }
1153         *actlen = urb->actual_length;
1154         return urb->status;
1155 }
1156
1157 static int do_proc_control(struct usb_dev_state *ps,
1158                 struct usbdevfs_ctrltransfer *ctrl)
1159 {
1160         struct usb_device *dev = ps->dev;
1161         unsigned int tmo;
1162         unsigned char *tbuf;
1163         unsigned int wLength, actlen;
1164         int i, pipe, ret;
1165         struct urb *urb = NULL;
1166         struct usb_ctrlrequest *dr = NULL;
1167
1168         ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1169                               ctrl->wIndex);
1170         if (ret)
1171                 return ret;
1172         wLength = ctrl->wLength;        /* To suppress 64k PAGE_SIZE warning */
1173         if (wLength > PAGE_SIZE)
1174                 return -EINVAL;
1175         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1176                         sizeof(struct usb_ctrlrequest));
1177         if (ret)
1178                 return ret;
1179
1180         ret = -ENOMEM;
1181         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1182         if (!tbuf)
1183                 goto done;
1184         urb = usb_alloc_urb(0, GFP_NOIO);
1185         if (!urb)
1186                 goto done;
1187         dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
1188         if (!dr)
1189                 goto done;
1190
1191         dr->bRequestType = ctrl->bRequestType;
1192         dr->bRequest = ctrl->bRequest;
1193         dr->wValue = cpu_to_le16(ctrl->wValue);
1194         dr->wIndex = cpu_to_le16(ctrl->wIndex);
1195         dr->wLength = cpu_to_le16(ctrl->wLength);
1196
1197         tmo = ctrl->timeout;
1198         snoop(&dev->dev, "control urb: bRequestType=%02x "
1199                 "bRequest=%02x wValue=%04x "
1200                 "wIndex=%04x wLength=%04x\n",
1201                 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1202                 ctrl->wIndex, ctrl->wLength);
1203
1204         if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1205                 pipe = usb_rcvctrlpipe(dev, 0);
1206                 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1207                                 wLength, NULL, NULL);
1208                 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1209
1210                 usb_unlock_device(dev);
1211                 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1212
1213                 /* Linger a bit, prior to the next control message. */
1214                 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1215                         msleep(200);
1216                 usb_lock_device(dev);
1217                 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1218                 if (!i && actlen) {
1219                         if (copy_to_user(ctrl->data, tbuf, actlen)) {
1220                                 ret = -EFAULT;
1221                                 goto done;
1222                         }
1223                 }
1224         } else {
1225                 if (wLength) {
1226                         if (copy_from_user(tbuf, ctrl->data, wLength)) {
1227                                 ret = -EFAULT;
1228                                 goto done;
1229                         }
1230                 }
1231                 pipe = usb_sndctrlpipe(dev, 0);
1232                 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1233                                 wLength, NULL, NULL);
1234                 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1235
1236                 usb_unlock_device(dev);
1237                 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1238
1239                 /* Linger a bit, prior to the next control message. */
1240                 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1241                         msleep(200);
1242                 usb_lock_device(dev);
1243                 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1244         }
1245         if (i < 0 && i != -EPIPE) {
1246                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1247                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1248                            current->comm, ctrl->bRequestType, ctrl->bRequest,
1249                            ctrl->wLength, i);
1250         }
1251         ret = (i < 0 ? i : actlen);
1252
1253  done:
1254         kfree(dr);
1255         usb_free_urb(urb);
1256         free_page((unsigned long) tbuf);
1257         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1258                         sizeof(struct usb_ctrlrequest));
1259         return ret;
1260 }
1261
1262 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1263 {
1264         struct usbdevfs_ctrltransfer ctrl;
1265
1266         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1267                 return -EFAULT;
1268         return do_proc_control(ps, &ctrl);
1269 }
1270
1271 static int do_proc_bulk(struct usb_dev_state *ps,
1272                 struct usbdevfs_bulktransfer *bulk)
1273 {
1274         struct usb_device *dev = ps->dev;
1275         unsigned int tmo, len1, len2, pipe;
1276         unsigned char *tbuf;
1277         int i, ret;
1278         struct urb *urb = NULL;
1279         struct usb_host_endpoint *ep;
1280
1281         ret = findintfep(ps->dev, bulk->ep);
1282         if (ret < 0)
1283                 return ret;
1284         ret = checkintf(ps, ret);
1285         if (ret)
1286                 return ret;
1287
1288         len1 = bulk->len;
1289         if (len1 < 0 || len1 >= (INT_MAX - sizeof(struct urb)))
1290                 return -EINVAL;
1291
1292         if (bulk->ep & USB_DIR_IN)
1293                 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1294         else
1295                 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1296         ep = usb_pipe_endpoint(dev, pipe);
1297         if (!ep || !usb_endpoint_maxp(&ep->desc))
1298                 return -EINVAL;
1299         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1300         if (ret)
1301                 return ret;
1302
1303         /*
1304          * len1 can be almost arbitrarily large.  Don't WARN if it's
1305          * too big, just fail the request.
1306          */
1307         ret = -ENOMEM;
1308         tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1309         if (!tbuf)
1310                 goto done;
1311         urb = usb_alloc_urb(0, GFP_KERNEL);
1312         if (!urb)
1313                 goto done;
1314
1315         if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1316                         USB_ENDPOINT_XFER_INT) {
1317                 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1318                 usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1319                                 NULL, NULL, ep->desc.bInterval);
1320         } else {
1321                 usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1322         }
1323
1324         tmo = bulk->timeout;
1325         if (bulk->ep & 0x80) {
1326                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1327
1328                 usb_unlock_device(dev);
1329                 i = usbfs_start_wait_urb(urb, tmo, &len2);
1330                 usb_lock_device(dev);
1331                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1332
1333                 if (!i && len2) {
1334                         if (copy_to_user(bulk->data, tbuf, len2)) {
1335                                 ret = -EFAULT;
1336                                 goto done;
1337                         }
1338                 }
1339         } else {
1340                 if (len1) {
1341                         if (copy_from_user(tbuf, bulk->data, len1)) {
1342                                 ret = -EFAULT;
1343                                 goto done;
1344                         }
1345                 }
1346                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1347
1348                 usb_unlock_device(dev);
1349                 i = usbfs_start_wait_urb(urb, tmo, &len2);
1350                 usb_lock_device(dev);
1351                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1352         }
1353         ret = (i < 0 ? i : len2);
1354  done:
1355         usb_free_urb(urb);
1356         kfree(tbuf);
1357         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1358         return ret;
1359 }
1360
1361 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1362 {
1363         struct usbdevfs_bulktransfer bulk;
1364
1365         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1366                 return -EFAULT;
1367         return do_proc_bulk(ps, &bulk);
1368 }
1369
1370 static void check_reset_of_active_ep(struct usb_device *udev,
1371                 unsigned int epnum, char *ioctl_name)
1372 {
1373         struct usb_host_endpoint **eps;
1374         struct usb_host_endpoint *ep;
1375
1376         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1377         ep = eps[epnum & 0x0f];
1378         if (ep && !list_empty(&ep->urb_list))
1379                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1380                                 task_pid_nr(current), current->comm,
1381                                 ioctl_name, epnum);
1382 }
1383
1384 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1385 {
1386         unsigned int ep;
1387         int ret;
1388
1389         if (get_user(ep, (unsigned int __user *)arg))
1390                 return -EFAULT;
1391         ret = findintfep(ps->dev, ep);
1392         if (ret < 0)
1393                 return ret;
1394         ret = checkintf(ps, ret);
1395         if (ret)
1396                 return ret;
1397         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1398         usb_reset_endpoint(ps->dev, ep);
1399         return 0;
1400 }
1401
1402 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1403 {
1404         unsigned int ep;
1405         int pipe;
1406         int ret;
1407
1408         if (get_user(ep, (unsigned int __user *)arg))
1409                 return -EFAULT;
1410         ret = findintfep(ps->dev, ep);
1411         if (ret < 0)
1412                 return ret;
1413         ret = checkintf(ps, ret);
1414         if (ret)
1415                 return ret;
1416         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1417         if (ep & USB_DIR_IN)
1418                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1419         else
1420                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1421
1422         return usb_clear_halt(ps->dev, pipe);
1423 }
1424
1425 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1426 {
1427         struct usbdevfs_getdriver gd;
1428         struct usb_interface *intf;
1429         int ret;
1430
1431         if (copy_from_user(&gd, arg, sizeof(gd)))
1432                 return -EFAULT;
1433         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1434         if (!intf || !intf->dev.driver)
1435                 ret = -ENODATA;
1436         else {
1437                 strscpy(gd.driver, intf->dev.driver->name,
1438                                 sizeof(gd.driver));
1439                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1440         }
1441         return ret;
1442 }
1443
1444 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1445 {
1446         struct usbdevfs_connectinfo ci;
1447
1448         memset(&ci, 0, sizeof(ci));
1449         ci.devnum = ps->dev->devnum;
1450         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1451
1452         if (copy_to_user(arg, &ci, sizeof(ci)))
1453                 return -EFAULT;
1454         return 0;
1455 }
1456
1457 static int proc_conninfo_ex(struct usb_dev_state *ps,
1458                             void __user *arg, size_t size)
1459 {
1460         struct usbdevfs_conninfo_ex ci;
1461         struct usb_device *udev = ps->dev;
1462
1463         if (size < sizeof(ci.size))
1464                 return -EINVAL;
1465
1466         memset(&ci, 0, sizeof(ci));
1467         ci.size = sizeof(ci);
1468         ci.busnum = udev->bus->busnum;
1469         ci.devnum = udev->devnum;
1470         ci.speed = udev->speed;
1471
1472         while (udev && udev->portnum != 0) {
1473                 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1474                         ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1475                                         udev->portnum;
1476                 udev = udev->parent;
1477         }
1478
1479         if (ci.num_ports < ARRAY_SIZE(ci.ports))
1480                 memmove(&ci.ports[0],
1481                         &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1482                         ci.num_ports);
1483
1484         if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1485                 return -EFAULT;
1486
1487         return 0;
1488 }
1489
1490 static int proc_resetdevice(struct usb_dev_state *ps)
1491 {
1492         struct usb_host_config *actconfig = ps->dev->actconfig;
1493         struct usb_interface *interface;
1494         int i, number;
1495
1496         /* Don't allow a device reset if the process has dropped the
1497          * privilege to do such things and any of the interfaces are
1498          * currently claimed.
1499          */
1500         if (ps->privileges_dropped && actconfig) {
1501                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1502                         interface = actconfig->interface[i];
1503                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1504                         if (usb_interface_claimed(interface) &&
1505                                         !test_bit(number, &ps->ifclaimed)) {
1506                                 dev_warn(&ps->dev->dev,
1507                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1508                                         number, interface->dev.driver->name, current->comm);
1509                                 return -EACCES;
1510                         }
1511                 }
1512         }
1513
1514         return usb_reset_device(ps->dev);
1515 }
1516
1517 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1518 {
1519         struct usbdevfs_setinterface setintf;
1520         int ret;
1521
1522         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1523                 return -EFAULT;
1524         ret = checkintf(ps, setintf.interface);
1525         if (ret)
1526                 return ret;
1527
1528         destroy_async_on_interface(ps, setintf.interface);
1529
1530         return usb_set_interface(ps->dev, setintf.interface,
1531                         setintf.altsetting);
1532 }
1533
1534 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1535 {
1536         int u;
1537         int status = 0;
1538         struct usb_host_config *actconfig;
1539
1540         if (get_user(u, (int __user *)arg))
1541                 return -EFAULT;
1542
1543         actconfig = ps->dev->actconfig;
1544
1545         /* Don't touch the device if any interfaces are claimed.
1546          * It could interfere with other drivers' operations, and if
1547          * an interface is claimed by usbfs it could easily deadlock.
1548          */
1549         if (actconfig) {
1550                 int i;
1551
1552                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1553                         if (usb_interface_claimed(actconfig->interface[i])) {
1554                                 dev_warn(&ps->dev->dev,
1555                                         "usbfs: interface %d claimed by %s "
1556                                         "while '%s' sets config #%d\n",
1557                                         actconfig->interface[i]
1558                                                 ->cur_altsetting
1559                                                 ->desc.bInterfaceNumber,
1560                                         actconfig->interface[i]
1561                                                 ->dev.driver->name,
1562                                         current->comm, u);
1563                                 status = -EBUSY;
1564                                 break;
1565                         }
1566                 }
1567         }
1568
1569         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1570          * so avoid usb_set_configuration()'s kick to sysfs
1571          */
1572         if (status == 0) {
1573                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1574                         status = usb_reset_configuration(ps->dev);
1575                 else
1576                         status = usb_set_configuration(ps->dev, u);
1577         }
1578
1579         return status;
1580 }
1581
1582 static struct usb_memory *
1583 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1584 {
1585         struct usb_memory *usbm = NULL, *iter;
1586         unsigned long flags;
1587         unsigned long uurb_start = (unsigned long)uurb->buffer;
1588
1589         spin_lock_irqsave(&ps->lock, flags);
1590         list_for_each_entry(iter, &ps->memory_list, memlist) {
1591                 if (uurb_start >= iter->vm_start &&
1592                                 uurb_start < iter->vm_start + iter->size) {
1593                         if (uurb->buffer_length > iter->vm_start + iter->size -
1594                                         uurb_start) {
1595                                 usbm = ERR_PTR(-EINVAL);
1596                         } else {
1597                                 usbm = iter;
1598                                 usbm->urb_use_count++;
1599                         }
1600                         break;
1601                 }
1602         }
1603         spin_unlock_irqrestore(&ps->lock, flags);
1604         return usbm;
1605 }
1606
1607 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1608                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1609                         void __user *arg, sigval_t userurb_sigval)
1610 {
1611         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1612         struct usb_host_endpoint *ep;
1613         struct async *as = NULL;
1614         struct usb_ctrlrequest *dr = NULL;
1615         unsigned int u, totlen, isofrmlen;
1616         int i, ret, num_sgs = 0, ifnum = -1;
1617         int number_of_packets = 0;
1618         unsigned int stream_id = 0;
1619         void *buf;
1620         bool is_in;
1621         bool allow_short = false;
1622         bool allow_zero = false;
1623         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1624                                 USBDEVFS_URB_BULK_CONTINUATION |
1625                                 USBDEVFS_URB_NO_FSBR |
1626                                 USBDEVFS_URB_ZERO_PACKET |
1627                                 USBDEVFS_URB_NO_INTERRUPT;
1628         /* USBDEVFS_URB_ISO_ASAP is a special case */
1629         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1630                 mask |= USBDEVFS_URB_ISO_ASAP;
1631
1632         if (uurb->flags & ~mask)
1633                         return -EINVAL;
1634
1635         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1636                 return -EINVAL;
1637         if (uurb->buffer_length > 0 && !uurb->buffer)
1638                 return -EINVAL;
1639         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1640             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1641                 ifnum = findintfep(ps->dev, uurb->endpoint);
1642                 if (ifnum < 0)
1643                         return ifnum;
1644                 ret = checkintf(ps, ifnum);
1645                 if (ret)
1646                         return ret;
1647         }
1648         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1649         if (!ep)
1650                 return -ENOENT;
1651         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1652
1653         u = 0;
1654         switch (uurb->type) {
1655         case USBDEVFS_URB_TYPE_CONTROL:
1656                 if (!usb_endpoint_xfer_control(&ep->desc))
1657                         return -EINVAL;
1658                 /* min 8 byte setup packet */
1659                 if (uurb->buffer_length < 8)
1660                         return -EINVAL;
1661                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1662                 if (!dr)
1663                         return -ENOMEM;
1664                 if (copy_from_user(dr, uurb->buffer, 8)) {
1665                         ret = -EFAULT;
1666                         goto error;
1667                 }
1668                 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1669                         ret = -EINVAL;
1670                         goto error;
1671                 }
1672                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1673                                       le16_to_cpu(dr->wIndex));
1674                 if (ret)
1675                         goto error;
1676                 uurb->buffer_length = le16_to_cpu(dr->wLength);
1677                 uurb->buffer += 8;
1678                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1679                         is_in = true;
1680                         uurb->endpoint |= USB_DIR_IN;
1681                 } else {
1682                         is_in = false;
1683                         uurb->endpoint &= ~USB_DIR_IN;
1684                 }
1685                 if (is_in)
1686                         allow_short = true;
1687                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1688                         "bRequest=%02x wValue=%04x "
1689                         "wIndex=%04x wLength=%04x\n",
1690                         dr->bRequestType, dr->bRequest,
1691                         __le16_to_cpu(dr->wValue),
1692                         __le16_to_cpu(dr->wIndex),
1693                         __le16_to_cpu(dr->wLength));
1694                 u = sizeof(struct usb_ctrlrequest);
1695                 break;
1696
1697         case USBDEVFS_URB_TYPE_BULK:
1698                 if (!is_in)
1699                         allow_zero = true;
1700                 else
1701                         allow_short = true;
1702                 switch (usb_endpoint_type(&ep->desc)) {
1703                 case USB_ENDPOINT_XFER_CONTROL:
1704                 case USB_ENDPOINT_XFER_ISOC:
1705                         return -EINVAL;
1706                 case USB_ENDPOINT_XFER_INT:
1707                         /* allow single-shot interrupt transfers */
1708                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1709                         goto interrupt_urb;
1710                 }
1711                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1712                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1713                         num_sgs = 0;
1714                 if (ep->streams)
1715                         stream_id = uurb->stream_id;
1716                 break;
1717
1718         case USBDEVFS_URB_TYPE_INTERRUPT:
1719                 if (!usb_endpoint_xfer_int(&ep->desc))
1720                         return -EINVAL;
1721  interrupt_urb:
1722                 if (!is_in)
1723                         allow_zero = true;
1724                 else
1725                         allow_short = true;
1726                 break;
1727
1728         case USBDEVFS_URB_TYPE_ISO:
1729                 /* arbitrary limit */
1730                 if (uurb->number_of_packets < 1 ||
1731                     uurb->number_of_packets > 128)
1732                         return -EINVAL;
1733                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1734                         return -EINVAL;
1735                 number_of_packets = uurb->number_of_packets;
1736                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1737                                    number_of_packets;
1738                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1739                 if (IS_ERR(isopkt)) {
1740                         ret = PTR_ERR(isopkt);
1741                         isopkt = NULL;
1742                         goto error;
1743                 }
1744                 for (totlen = u = 0; u < number_of_packets; u++) {
1745                         /*
1746                          * arbitrary limit need for USB 3.1 Gen2
1747                          * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1748                          */
1749                         if (isopkt[u].length > 98304) {
1750                                 ret = -EINVAL;
1751                                 goto error;
1752                         }
1753                         totlen += isopkt[u].length;
1754                 }
1755                 u *= sizeof(struct usb_iso_packet_descriptor);
1756                 uurb->buffer_length = totlen;
1757                 break;
1758
1759         default:
1760                 return -EINVAL;
1761         }
1762
1763         if (uurb->buffer_length > 0 &&
1764                         !access_ok(uurb->buffer, uurb->buffer_length)) {
1765                 ret = -EFAULT;
1766                 goto error;
1767         }
1768         as = alloc_async(number_of_packets);
1769         if (!as) {
1770                 ret = -ENOMEM;
1771                 goto error;
1772         }
1773
1774         as->usbm = find_memory_area(ps, uurb);
1775         if (IS_ERR(as->usbm)) {
1776                 ret = PTR_ERR(as->usbm);
1777                 as->usbm = NULL;
1778                 goto error;
1779         }
1780
1781         /* do not use SG buffers when memory mapped segments
1782          * are in use
1783          */
1784         if (as->usbm)
1785                 num_sgs = 0;
1786
1787         u += sizeof(struct async) + sizeof(struct urb) +
1788              (as->usbm ? 0 : uurb->buffer_length) +
1789              num_sgs * sizeof(struct scatterlist);
1790         ret = usbfs_increase_memory_usage(u);
1791         if (ret)
1792                 goto error;
1793         as->mem_usage = u;
1794
1795         if (num_sgs) {
1796                 as->urb->sg = kmalloc_array(num_sgs,
1797                                             sizeof(struct scatterlist),
1798                                             GFP_KERNEL | __GFP_NOWARN);
1799                 if (!as->urb->sg) {
1800                         ret = -ENOMEM;
1801                         goto error;
1802                 }
1803                 as->urb->num_sgs = num_sgs;
1804                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1805
1806                 totlen = uurb->buffer_length;
1807                 for (i = 0; i < as->urb->num_sgs; i++) {
1808                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1809                         buf = kmalloc(u, GFP_KERNEL);
1810                         if (!buf) {
1811                                 ret = -ENOMEM;
1812                                 goto error;
1813                         }
1814                         sg_set_buf(&as->urb->sg[i], buf, u);
1815
1816                         if (!is_in) {
1817                                 if (copy_from_user(buf, uurb->buffer, u)) {
1818                                         ret = -EFAULT;
1819                                         goto error;
1820                                 }
1821                                 uurb->buffer += u;
1822                         }
1823                         totlen -= u;
1824                 }
1825         } else if (uurb->buffer_length > 0) {
1826                 if (as->usbm) {
1827                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1828
1829                         as->urb->transfer_buffer = as->usbm->mem +
1830                                         (uurb_start - as->usbm->vm_start);
1831                 } else {
1832                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1833                                         GFP_KERNEL | __GFP_NOWARN);
1834                         if (!as->urb->transfer_buffer) {
1835                                 ret = -ENOMEM;
1836                                 goto error;
1837                         }
1838                         if (!is_in) {
1839                                 if (copy_from_user(as->urb->transfer_buffer,
1840                                                    uurb->buffer,
1841                                                    uurb->buffer_length)) {
1842                                         ret = -EFAULT;
1843                                         goto error;
1844                                 }
1845                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1846                                 /*
1847                                  * Isochronous input data may end up being
1848                                  * discontiguous if some of the packets are
1849                                  * short. Clear the buffer so that the gaps
1850                                  * don't leak kernel data to userspace.
1851                                  */
1852                                 memset(as->urb->transfer_buffer, 0,
1853                                                 uurb->buffer_length);
1854                         }
1855                 }
1856         }
1857         as->urb->dev = ps->dev;
1858         as->urb->pipe = (uurb->type << 30) |
1859                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1860                         (uurb->endpoint & USB_DIR_IN);
1861
1862         /* This tedious sequence is necessary because the URB_* flags
1863          * are internal to the kernel and subject to change, whereas
1864          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1865          */
1866         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1867         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1868                 u |= URB_ISO_ASAP;
1869         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1870                 u |= URB_SHORT_NOT_OK;
1871         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1872                 u |= URB_ZERO_PACKET;
1873         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1874                 u |= URB_NO_INTERRUPT;
1875         as->urb->transfer_flags = u;
1876
1877         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1878                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1879         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1880                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1881
1882         as->urb->transfer_buffer_length = uurb->buffer_length;
1883         as->urb->setup_packet = (unsigned char *)dr;
1884         dr = NULL;
1885         as->urb->start_frame = uurb->start_frame;
1886         as->urb->number_of_packets = number_of_packets;
1887         as->urb->stream_id = stream_id;
1888
1889         if (ep->desc.bInterval) {
1890                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1891                                 ps->dev->speed == USB_SPEED_HIGH ||
1892                                 ps->dev->speed >= USB_SPEED_SUPER)
1893                         as->urb->interval = 1 <<
1894                                         min(15, ep->desc.bInterval - 1);
1895                 else
1896                         as->urb->interval = ep->desc.bInterval;
1897         }
1898
1899         as->urb->context = as;
1900         as->urb->complete = async_completed;
1901         for (totlen = u = 0; u < number_of_packets; u++) {
1902                 as->urb->iso_frame_desc[u].offset = totlen;
1903                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1904                 totlen += isopkt[u].length;
1905         }
1906         kfree(isopkt);
1907         isopkt = NULL;
1908         as->ps = ps;
1909         as->userurb = arg;
1910         as->userurb_sigval = userurb_sigval;
1911         if (as->usbm) {
1912                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1913
1914                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1915                 as->urb->transfer_dma = as->usbm->dma_handle +
1916                                 (uurb_start - as->usbm->vm_start);
1917         } else if (is_in && uurb->buffer_length > 0)
1918                 as->userbuffer = uurb->buffer;
1919         as->signr = uurb->signr;
1920         as->ifnum = ifnum;
1921         as->pid = get_pid(task_pid(current));
1922         as->cred = get_current_cred();
1923         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1924                         as->urb->transfer_buffer_length, 0, SUBMIT,
1925                         NULL, 0);
1926         if (!is_in)
1927                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1928
1929         async_newpending(as);
1930
1931         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1932                 spin_lock_irq(&ps->lock);
1933
1934                 /* Not exactly the endpoint address; the direction bit is
1935                  * shifted to the 0x10 position so that the value will be
1936                  * between 0 and 31.
1937                  */
1938                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1939                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1940                                 >> 3);
1941
1942                 /* If this bulk URB is the start of a new transfer, re-enable
1943                  * the endpoint.  Otherwise mark it as a continuation URB.
1944                  */
1945                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1946                         as->bulk_status = AS_CONTINUATION;
1947                 else
1948                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1949
1950                 /* Don't accept continuation URBs if the endpoint is
1951                  * disabled because of an earlier error.
1952                  */
1953                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1954                         ret = -EREMOTEIO;
1955                 else
1956                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1957                 spin_unlock_irq(&ps->lock);
1958         } else {
1959                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1960         }
1961
1962         if (ret) {
1963                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1964                            "usbfs: usb_submit_urb returned %d\n", ret);
1965                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1966                                 0, ret, COMPLETE, NULL, 0);
1967                 async_removepending(as);
1968                 goto error;
1969         }
1970         return 0;
1971
1972  error:
1973         kfree(isopkt);
1974         kfree(dr);
1975         if (as)
1976                 free_async(as);
1977         return ret;
1978 }
1979
1980 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1981 {
1982         struct usbdevfs_urb uurb;
1983         sigval_t userurb_sigval;
1984
1985         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1986                 return -EFAULT;
1987
1988         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1989         userurb_sigval.sival_ptr = arg;
1990
1991         return proc_do_submiturb(ps, &uurb,
1992                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1993                         arg, userurb_sigval);
1994 }
1995
1996 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1997 {
1998         struct urb *urb;
1999         struct async *as;
2000         unsigned long flags;
2001
2002         spin_lock_irqsave(&ps->lock, flags);
2003         as = async_getpending(ps, arg);
2004         if (!as) {
2005                 spin_unlock_irqrestore(&ps->lock, flags);
2006                 return -EINVAL;
2007         }
2008
2009         urb = as->urb;
2010         usb_get_urb(urb);
2011         spin_unlock_irqrestore(&ps->lock, flags);
2012
2013         usb_kill_urb(urb);
2014         usb_put_urb(urb);
2015
2016         return 0;
2017 }
2018
2019 static void compute_isochronous_actual_length(struct urb *urb)
2020 {
2021         unsigned int i;
2022
2023         if (urb->number_of_packets > 0) {
2024                 urb->actual_length = 0;
2025                 for (i = 0; i < urb->number_of_packets; i++)
2026                         urb->actual_length +=
2027                                         urb->iso_frame_desc[i].actual_length;
2028         }
2029 }
2030
2031 static int processcompl(struct async *as, void __user * __user *arg)
2032 {
2033         struct urb *urb = as->urb;
2034         struct usbdevfs_urb __user *userurb = as->userurb;
2035         void __user *addr = as->userurb;
2036         unsigned int i;
2037
2038         compute_isochronous_actual_length(urb);
2039         if (as->userbuffer && urb->actual_length) {
2040                 if (copy_urb_data_to_user(as->userbuffer, urb))
2041                         goto err_out;
2042         }
2043         if (put_user(as->status, &userurb->status))
2044                 goto err_out;
2045         if (put_user(urb->actual_length, &userurb->actual_length))
2046                 goto err_out;
2047         if (put_user(urb->error_count, &userurb->error_count))
2048                 goto err_out;
2049
2050         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2051                 for (i = 0; i < urb->number_of_packets; i++) {
2052                         if (put_user(urb->iso_frame_desc[i].actual_length,
2053                                      &userurb->iso_frame_desc[i].actual_length))
2054                                 goto err_out;
2055                         if (put_user(urb->iso_frame_desc[i].status,
2056                                      &userurb->iso_frame_desc[i].status))
2057                                 goto err_out;
2058                 }
2059         }
2060
2061         if (put_user(addr, (void __user * __user *)arg))
2062                 return -EFAULT;
2063         return 0;
2064
2065 err_out:
2066         return -EFAULT;
2067 }
2068
2069 static struct async *reap_as(struct usb_dev_state *ps)
2070 {
2071         DECLARE_WAITQUEUE(wait, current);
2072         struct async *as = NULL;
2073         struct usb_device *dev = ps->dev;
2074
2075         add_wait_queue(&ps->wait, &wait);
2076         for (;;) {
2077                 __set_current_state(TASK_INTERRUPTIBLE);
2078                 as = async_getcompleted(ps);
2079                 if (as || !connected(ps))
2080                         break;
2081                 if (signal_pending(current))
2082                         break;
2083                 usb_unlock_device(dev);
2084                 schedule();
2085                 usb_lock_device(dev);
2086         }
2087         remove_wait_queue(&ps->wait, &wait);
2088         set_current_state(TASK_RUNNING);
2089         return as;
2090 }
2091
2092 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2093 {
2094         struct async *as = reap_as(ps);
2095
2096         if (as) {
2097                 int retval;
2098
2099                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2100                 retval = processcompl(as, (void __user * __user *)arg);
2101                 free_async(as);
2102                 return retval;
2103         }
2104         if (signal_pending(current))
2105                 return -EINTR;
2106         return -ENODEV;
2107 }
2108
2109 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2110 {
2111         int retval;
2112         struct async *as;
2113
2114         as = async_getcompleted(ps);
2115         if (as) {
2116                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2117                 retval = processcompl(as, (void __user * __user *)arg);
2118                 free_async(as);
2119         } else {
2120                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2121         }
2122         return retval;
2123 }
2124
2125 #ifdef CONFIG_COMPAT
2126 static int proc_control_compat(struct usb_dev_state *ps,
2127                                 struct usbdevfs_ctrltransfer32 __user *p32)
2128 {
2129         struct usbdevfs_ctrltransfer ctrl;
2130         u32 udata;
2131
2132         if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2133             get_user(udata, &p32->data))
2134                 return -EFAULT;
2135         ctrl.data = compat_ptr(udata);
2136         return do_proc_control(ps, &ctrl);
2137 }
2138
2139 static int proc_bulk_compat(struct usb_dev_state *ps,
2140                         struct usbdevfs_bulktransfer32 __user *p32)
2141 {
2142         struct usbdevfs_bulktransfer bulk;
2143         compat_caddr_t addr;
2144
2145         if (get_user(bulk.ep, &p32->ep) ||
2146             get_user(bulk.len, &p32->len) ||
2147             get_user(bulk.timeout, &p32->timeout) ||
2148             get_user(addr, &p32->data))
2149                 return -EFAULT;
2150         bulk.data = compat_ptr(addr);
2151         return do_proc_bulk(ps, &bulk);
2152 }
2153
2154 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2155 {
2156         struct usbdevfs_disconnectsignal32 ds;
2157
2158         if (copy_from_user(&ds, arg, sizeof(ds)))
2159                 return -EFAULT;
2160         ps->discsignr = ds.signr;
2161         ps->disccontext.sival_int = ds.context;
2162         return 0;
2163 }
2164
2165 static int get_urb32(struct usbdevfs_urb *kurb,
2166                      struct usbdevfs_urb32 __user *uurb)
2167 {
2168         struct usbdevfs_urb32 urb32;
2169         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2170                 return -EFAULT;
2171         kurb->type = urb32.type;
2172         kurb->endpoint = urb32.endpoint;
2173         kurb->status = urb32.status;
2174         kurb->flags = urb32.flags;
2175         kurb->buffer = compat_ptr(urb32.buffer);
2176         kurb->buffer_length = urb32.buffer_length;
2177         kurb->actual_length = urb32.actual_length;
2178         kurb->start_frame = urb32.start_frame;
2179         kurb->number_of_packets = urb32.number_of_packets;
2180         kurb->error_count = urb32.error_count;
2181         kurb->signr = urb32.signr;
2182         kurb->usercontext = compat_ptr(urb32.usercontext);
2183         return 0;
2184 }
2185
2186 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2187 {
2188         struct usbdevfs_urb uurb;
2189         sigval_t userurb_sigval;
2190
2191         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2192                 return -EFAULT;
2193
2194         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2195         userurb_sigval.sival_int = ptr_to_compat(arg);
2196
2197         return proc_do_submiturb(ps, &uurb,
2198                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2199                         arg, userurb_sigval);
2200 }
2201
2202 static int processcompl_compat(struct async *as, void __user * __user *arg)
2203 {
2204         struct urb *urb = as->urb;
2205         struct usbdevfs_urb32 __user *userurb = as->userurb;
2206         void __user *addr = as->userurb;
2207         unsigned int i;
2208
2209         compute_isochronous_actual_length(urb);
2210         if (as->userbuffer && urb->actual_length) {
2211                 if (copy_urb_data_to_user(as->userbuffer, urb))
2212                         return -EFAULT;
2213         }
2214         if (put_user(as->status, &userurb->status))
2215                 return -EFAULT;
2216         if (put_user(urb->actual_length, &userurb->actual_length))
2217                 return -EFAULT;
2218         if (put_user(urb->error_count, &userurb->error_count))
2219                 return -EFAULT;
2220
2221         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2222                 for (i = 0; i < urb->number_of_packets; i++) {
2223                         if (put_user(urb->iso_frame_desc[i].actual_length,
2224                                      &userurb->iso_frame_desc[i].actual_length))
2225                                 return -EFAULT;
2226                         if (put_user(urb->iso_frame_desc[i].status,
2227                                      &userurb->iso_frame_desc[i].status))
2228                                 return -EFAULT;
2229                 }
2230         }
2231
2232         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2233                 return -EFAULT;
2234         return 0;
2235 }
2236
2237 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2238 {
2239         struct async *as = reap_as(ps);
2240
2241         if (as) {
2242                 int retval;
2243
2244                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2245                 retval = processcompl_compat(as, (void __user * __user *)arg);
2246                 free_async(as);
2247                 return retval;
2248         }
2249         if (signal_pending(current))
2250                 return -EINTR;
2251         return -ENODEV;
2252 }
2253
2254 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2255 {
2256         int retval;
2257         struct async *as;
2258
2259         as = async_getcompleted(ps);
2260         if (as) {
2261                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2262                 retval = processcompl_compat(as, (void __user * __user *)arg);
2263                 free_async(as);
2264         } else {
2265                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2266         }
2267         return retval;
2268 }
2269
2270
2271 #endif
2272
2273 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2274 {
2275         struct usbdevfs_disconnectsignal ds;
2276
2277         if (copy_from_user(&ds, arg, sizeof(ds)))
2278                 return -EFAULT;
2279         ps->discsignr = ds.signr;
2280         ps->disccontext.sival_ptr = ds.context;
2281         return 0;
2282 }
2283
2284 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2285 {
2286         unsigned int ifnum;
2287
2288         if (get_user(ifnum, (unsigned int __user *)arg))
2289                 return -EFAULT;
2290         return claimintf(ps, ifnum);
2291 }
2292
2293 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2294 {
2295         unsigned int ifnum;
2296         int ret;
2297
2298         if (get_user(ifnum, (unsigned int __user *)arg))
2299                 return -EFAULT;
2300         ret = releaseintf(ps, ifnum);
2301         if (ret < 0)
2302                 return ret;
2303         destroy_async_on_interface(ps, ifnum);
2304         return 0;
2305 }
2306
2307 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2308 {
2309         int                     size;
2310         void                    *buf = NULL;
2311         int                     retval = 0;
2312         struct usb_interface    *intf = NULL;
2313         struct usb_driver       *driver = NULL;
2314
2315         if (ps->privileges_dropped)
2316                 return -EACCES;
2317
2318         if (!connected(ps))
2319                 return -ENODEV;
2320
2321         /* alloc buffer */
2322         size = _IOC_SIZE(ctl->ioctl_code);
2323         if (size > 0) {
2324                 buf = kmalloc(size, GFP_KERNEL);
2325                 if (buf == NULL)
2326                         return -ENOMEM;
2327                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2328                         if (copy_from_user(buf, ctl->data, size)) {
2329                                 kfree(buf);
2330                                 return -EFAULT;
2331                         }
2332                 } else {
2333                         memset(buf, 0, size);
2334                 }
2335         }
2336
2337         if (ps->dev->state != USB_STATE_CONFIGURED)
2338                 retval = -EHOSTUNREACH;
2339         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2340                 retval = -EINVAL;
2341         else switch (ctl->ioctl_code) {
2342
2343         /* disconnect kernel driver from interface */
2344         case USBDEVFS_DISCONNECT:
2345                 if (intf->dev.driver) {
2346                         driver = to_usb_driver(intf->dev.driver);
2347                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2348                         usb_driver_release_interface(driver, intf);
2349                 } else
2350                         retval = -ENODATA;
2351                 break;
2352
2353         /* let kernel drivers try to (re)bind to the interface */
2354         case USBDEVFS_CONNECT:
2355                 if (!intf->dev.driver)
2356                         retval = device_attach(&intf->dev);
2357                 else
2358                         retval = -EBUSY;
2359                 break;
2360
2361         /* talk directly to the interface's driver */
2362         default:
2363                 if (intf->dev.driver)
2364                         driver = to_usb_driver(intf->dev.driver);
2365                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2366                         retval = -ENOTTY;
2367                 } else {
2368                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2369                         if (retval == -ENOIOCTLCMD)
2370                                 retval = -ENOTTY;
2371                 }
2372         }
2373
2374         /* cleanup and return */
2375         if (retval >= 0
2376                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2377                         && size > 0
2378                         && copy_to_user(ctl->data, buf, size) != 0)
2379                 retval = -EFAULT;
2380
2381         kfree(buf);
2382         return retval;
2383 }
2384
2385 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2386 {
2387         struct usbdevfs_ioctl   ctrl;
2388
2389         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2390                 return -EFAULT;
2391         return proc_ioctl(ps, &ctrl);
2392 }
2393
2394 #ifdef CONFIG_COMPAT
2395 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2396 {
2397         struct usbdevfs_ioctl32 ioc32;
2398         struct usbdevfs_ioctl ctrl;
2399
2400         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2401                 return -EFAULT;
2402         ctrl.ifno = ioc32.ifno;
2403         ctrl.ioctl_code = ioc32.ioctl_code;
2404         ctrl.data = compat_ptr(ioc32.data);
2405         return proc_ioctl(ps, &ctrl);
2406 }
2407 #endif
2408
2409 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2410 {
2411         unsigned portnum;
2412         int rc;
2413
2414         if (get_user(portnum, (unsigned __user *) arg))
2415                 return -EFAULT;
2416         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2417         if (rc == 0)
2418                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2419                         portnum, task_pid_nr(current), current->comm);
2420         return rc;
2421 }
2422
2423 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2424 {
2425         unsigned portnum;
2426
2427         if (get_user(portnum, (unsigned __user *) arg))
2428                 return -EFAULT;
2429         return usb_hub_release_port(ps->dev, portnum, ps);
2430 }
2431
2432 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2433 {
2434         __u32 caps;
2435
2436         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2437                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2438                         USBDEVFS_CAP_DROP_PRIVILEGES |
2439                         USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2440         if (!ps->dev->bus->no_stop_on_short)
2441                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2442         if (ps->dev->bus->sg_tablesize)
2443                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2444
2445         if (put_user(caps, (__u32 __user *)arg))
2446                 return -EFAULT;
2447
2448         return 0;
2449 }
2450
2451 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2452 {
2453         struct usbdevfs_disconnect_claim dc;
2454         struct usb_interface *intf;
2455
2456         if (copy_from_user(&dc, arg, sizeof(dc)))
2457                 return -EFAULT;
2458
2459         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2460         if (!intf)
2461                 return -EINVAL;
2462
2463         if (intf->dev.driver) {
2464                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2465
2466                 if (ps->privileges_dropped)
2467                         return -EACCES;
2468
2469                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2470                                 strncmp(dc.driver, intf->dev.driver->name,
2471                                         sizeof(dc.driver)) != 0)
2472                         return -EBUSY;
2473
2474                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2475                                 strncmp(dc.driver, intf->dev.driver->name,
2476                                         sizeof(dc.driver)) == 0)
2477                         return -EBUSY;
2478
2479                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2480                 usb_driver_release_interface(driver, intf);
2481         }
2482
2483         return claimintf(ps, dc.interface);
2484 }
2485
2486 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2487 {
2488         unsigned num_streams, num_eps;
2489         struct usb_host_endpoint **eps;
2490         struct usb_interface *intf;
2491         int r;
2492
2493         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2494                                    &eps, &intf);
2495         if (r)
2496                 return r;
2497
2498         destroy_async_on_interface(ps,
2499                                    intf->altsetting[0].desc.bInterfaceNumber);
2500
2501         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2502         kfree(eps);
2503         return r;
2504 }
2505
2506 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2507 {
2508         unsigned num_eps;
2509         struct usb_host_endpoint **eps;
2510         struct usb_interface *intf;
2511         int r;
2512
2513         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2514         if (r)
2515                 return r;
2516
2517         destroy_async_on_interface(ps,
2518                                    intf->altsetting[0].desc.bInterfaceNumber);
2519
2520         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2521         kfree(eps);
2522         return r;
2523 }
2524
2525 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2526 {
2527         u32 data;
2528
2529         if (copy_from_user(&data, arg, sizeof(data)))
2530                 return -EFAULT;
2531
2532         /* This is a one way operation. Once privileges are
2533          * dropped, you cannot regain them. You may however reissue
2534          * this ioctl to shrink the allowed interfaces mask.
2535          */
2536         ps->interface_allowed_mask &= data;
2537         ps->privileges_dropped = true;
2538
2539         return 0;
2540 }
2541
2542 static int proc_forbid_suspend(struct usb_dev_state *ps)
2543 {
2544         int ret = 0;
2545
2546         if (ps->suspend_allowed) {
2547                 ret = usb_autoresume_device(ps->dev);
2548                 if (ret == 0)
2549                         ps->suspend_allowed = false;
2550                 else if (ret != -ENODEV)
2551                         ret = -EIO;
2552         }
2553         return ret;
2554 }
2555
2556 static int proc_allow_suspend(struct usb_dev_state *ps)
2557 {
2558         if (!connected(ps))
2559                 return -ENODEV;
2560
2561         WRITE_ONCE(ps->not_yet_resumed, 1);
2562         if (!ps->suspend_allowed) {
2563                 usb_autosuspend_device(ps->dev);
2564                 ps->suspend_allowed = true;
2565         }
2566         return 0;
2567 }
2568
2569 static int proc_wait_for_resume(struct usb_dev_state *ps)
2570 {
2571         int ret;
2572
2573         usb_unlock_device(ps->dev);
2574         ret = wait_event_interruptible(ps->wait_for_resume,
2575                         READ_ONCE(ps->not_yet_resumed) == 0);
2576         usb_lock_device(ps->dev);
2577
2578         if (ret != 0)
2579                 return -EINTR;
2580         return proc_forbid_suspend(ps);
2581 }
2582
2583 /*
2584  * NOTE:  All requests here that have interface numbers as parameters
2585  * are assuming that somehow the configuration has been prevented from
2586  * changing.  But there's no mechanism to ensure that...
2587  */
2588 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2589                                 void __user *p)
2590 {
2591         struct usb_dev_state *ps = file->private_data;
2592         struct inode *inode = file_inode(file);
2593         struct usb_device *dev = ps->dev;
2594         int ret = -ENOTTY;
2595
2596         if (!(file->f_mode & FMODE_WRITE))
2597                 return -EPERM;
2598
2599         usb_lock_device(dev);
2600
2601         /* Reap operations are allowed even after disconnection */
2602         switch (cmd) {
2603         case USBDEVFS_REAPURB:
2604                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2605                 ret = proc_reapurb(ps, p);
2606                 goto done;
2607
2608         case USBDEVFS_REAPURBNDELAY:
2609                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2610                 ret = proc_reapurbnonblock(ps, p);
2611                 goto done;
2612
2613 #ifdef CONFIG_COMPAT
2614         case USBDEVFS_REAPURB32:
2615                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2616                 ret = proc_reapurb_compat(ps, p);
2617                 goto done;
2618
2619         case USBDEVFS_REAPURBNDELAY32:
2620                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2621                 ret = proc_reapurbnonblock_compat(ps, p);
2622                 goto done;
2623 #endif
2624         }
2625
2626         if (!connected(ps)) {
2627                 usb_unlock_device(dev);
2628                 return -ENODEV;
2629         }
2630
2631         switch (cmd) {
2632         case USBDEVFS_CONTROL:
2633                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2634                 ret = proc_control(ps, p);
2635                 if (ret >= 0)
2636                         inode->i_mtime = current_time(inode);
2637                 break;
2638
2639         case USBDEVFS_BULK:
2640                 snoop(&dev->dev, "%s: BULK\n", __func__);
2641                 ret = proc_bulk(ps, p);
2642                 if (ret >= 0)
2643                         inode->i_mtime = current_time(inode);
2644                 break;
2645
2646         case USBDEVFS_RESETEP:
2647                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2648                 ret = proc_resetep(ps, p);
2649                 if (ret >= 0)
2650                         inode->i_mtime = current_time(inode);
2651                 break;
2652
2653         case USBDEVFS_RESET:
2654                 snoop(&dev->dev, "%s: RESET\n", __func__);
2655                 ret = proc_resetdevice(ps);
2656                 break;
2657
2658         case USBDEVFS_CLEAR_HALT:
2659                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2660                 ret = proc_clearhalt(ps, p);
2661                 if (ret >= 0)
2662                         inode->i_mtime = current_time(inode);
2663                 break;
2664
2665         case USBDEVFS_GETDRIVER:
2666                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2667                 ret = proc_getdriver(ps, p);
2668                 break;
2669
2670         case USBDEVFS_CONNECTINFO:
2671                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2672                 ret = proc_connectinfo(ps, p);
2673                 break;
2674
2675         case USBDEVFS_SETINTERFACE:
2676                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2677                 ret = proc_setintf(ps, p);
2678                 break;
2679
2680         case USBDEVFS_SETCONFIGURATION:
2681                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2682                 ret = proc_setconfig(ps, p);
2683                 break;
2684
2685         case USBDEVFS_SUBMITURB:
2686                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2687                 ret = proc_submiturb(ps, p);
2688                 if (ret >= 0)
2689                         inode->i_mtime = current_time(inode);
2690                 break;
2691
2692 #ifdef CONFIG_COMPAT
2693         case USBDEVFS_CONTROL32:
2694                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2695                 ret = proc_control_compat(ps, p);
2696                 if (ret >= 0)
2697                         inode->i_mtime = current_time(inode);
2698                 break;
2699
2700         case USBDEVFS_BULK32:
2701                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2702                 ret = proc_bulk_compat(ps, p);
2703                 if (ret >= 0)
2704                         inode->i_mtime = current_time(inode);
2705                 break;
2706
2707         case USBDEVFS_DISCSIGNAL32:
2708                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2709                 ret = proc_disconnectsignal_compat(ps, p);
2710                 break;
2711
2712         case USBDEVFS_SUBMITURB32:
2713                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2714                 ret = proc_submiturb_compat(ps, p);
2715                 if (ret >= 0)
2716                         inode->i_mtime = current_time(inode);
2717                 break;
2718
2719         case USBDEVFS_IOCTL32:
2720                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2721                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2722                 break;
2723 #endif
2724
2725         case USBDEVFS_DISCARDURB:
2726                 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2727                 ret = proc_unlinkurb(ps, p);
2728                 break;
2729
2730         case USBDEVFS_DISCSIGNAL:
2731                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2732                 ret = proc_disconnectsignal(ps, p);
2733                 break;
2734
2735         case USBDEVFS_CLAIMINTERFACE:
2736                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2737                 ret = proc_claiminterface(ps, p);
2738                 break;
2739
2740         case USBDEVFS_RELEASEINTERFACE:
2741                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2742                 ret = proc_releaseinterface(ps, p);
2743                 break;
2744
2745         case USBDEVFS_IOCTL:
2746                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2747                 ret = proc_ioctl_default(ps, p);
2748                 break;
2749
2750         case USBDEVFS_CLAIM_PORT:
2751                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2752                 ret = proc_claim_port(ps, p);
2753                 break;
2754
2755         case USBDEVFS_RELEASE_PORT:
2756                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2757                 ret = proc_release_port(ps, p);
2758                 break;
2759         case USBDEVFS_GET_CAPABILITIES:
2760                 ret = proc_get_capabilities(ps, p);
2761                 break;
2762         case USBDEVFS_DISCONNECT_CLAIM:
2763                 ret = proc_disconnect_claim(ps, p);
2764                 break;
2765         case USBDEVFS_ALLOC_STREAMS:
2766                 ret = proc_alloc_streams(ps, p);
2767                 break;
2768         case USBDEVFS_FREE_STREAMS:
2769                 ret = proc_free_streams(ps, p);
2770                 break;
2771         case USBDEVFS_DROP_PRIVILEGES:
2772                 ret = proc_drop_privileges(ps, p);
2773                 break;
2774         case USBDEVFS_GET_SPEED:
2775                 ret = ps->dev->speed;
2776                 break;
2777         case USBDEVFS_FORBID_SUSPEND:
2778                 ret = proc_forbid_suspend(ps);
2779                 break;
2780         case USBDEVFS_ALLOW_SUSPEND:
2781                 ret = proc_allow_suspend(ps);
2782                 break;
2783         case USBDEVFS_WAIT_FOR_RESUME:
2784                 ret = proc_wait_for_resume(ps);
2785                 break;
2786         }
2787
2788         /* Handle variable-length commands */
2789         switch (cmd & ~IOCSIZE_MASK) {
2790         case USBDEVFS_CONNINFO_EX(0):
2791                 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2792                 break;
2793         }
2794
2795  done:
2796         usb_unlock_device(dev);
2797         if (ret >= 0)
2798                 inode->i_atime = current_time(inode);
2799         return ret;
2800 }
2801
2802 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2803                         unsigned long arg)
2804 {
2805         int ret;
2806
2807         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2808
2809         return ret;
2810 }
2811
2812 /* No kernel lock - fine */
2813 static __poll_t usbdev_poll(struct file *file,
2814                                 struct poll_table_struct *wait)
2815 {
2816         struct usb_dev_state *ps = file->private_data;
2817         __poll_t mask = 0;
2818
2819         poll_wait(file, &ps->wait, wait);
2820         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2821                 mask |= EPOLLOUT | EPOLLWRNORM;
2822         if (!connected(ps))
2823                 mask |= EPOLLHUP;
2824         if (list_empty(&ps->list))
2825                 mask |= EPOLLERR;
2826         return mask;
2827 }
2828
2829 const struct file_operations usbdev_file_operations = {
2830         .owner =          THIS_MODULE,
2831         .llseek =         no_seek_end_llseek,
2832         .read =           usbdev_read,
2833         .poll =           usbdev_poll,
2834         .unlocked_ioctl = usbdev_ioctl,
2835         .compat_ioctl =   compat_ptr_ioctl,
2836         .mmap =           usbdev_mmap,
2837         .open =           usbdev_open,
2838         .release =        usbdev_release,
2839 };
2840
2841 static void usbdev_remove(struct usb_device *udev)
2842 {
2843         struct usb_dev_state *ps;
2844
2845         /* Protect against simultaneous resume */
2846         mutex_lock(&usbfs_mutex);
2847         while (!list_empty(&udev->filelist)) {
2848                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2849                 destroy_all_async(ps);
2850                 wake_up_all(&ps->wait);
2851                 WRITE_ONCE(ps->not_yet_resumed, 0);
2852                 wake_up_all(&ps->wait_for_resume);
2853                 list_del_init(&ps->list);
2854                 if (ps->discsignr)
2855                         kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2856                                              ps->disc_pid, ps->cred);
2857         }
2858         mutex_unlock(&usbfs_mutex);
2859 }
2860
2861 static int usbdev_notify(struct notifier_block *self,
2862                                unsigned long action, void *dev)
2863 {
2864         switch (action) {
2865         case USB_DEVICE_ADD:
2866                 break;
2867         case USB_DEVICE_REMOVE:
2868                 usbdev_remove(dev);
2869                 break;
2870         }
2871         return NOTIFY_OK;
2872 }
2873
2874 static struct notifier_block usbdev_nb = {
2875         .notifier_call =        usbdev_notify,
2876 };
2877
2878 static struct cdev usb_device_cdev;
2879
2880 int __init usb_devio_init(void)
2881 {
2882         int retval;
2883
2884         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2885                                         "usb_device");
2886         if (retval) {
2887                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2888                 goto out;
2889         }
2890         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2891         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2892         if (retval) {
2893                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2894                        USB_DEVICE_MAJOR);
2895                 goto error_cdev;
2896         }
2897         usb_register_notify(&usbdev_nb);
2898 out:
2899         return retval;
2900
2901 error_cdev:
2902         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2903         goto out;
2904 }
2905
2906 void usb_devio_cleanup(void)
2907 {
2908         usb_unregister_notify(&usbdev_nb);
2909         cdev_del(&usb_device_cdev);
2910         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2911 }