drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer ([email protected])
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/sched/signal.h>
  40 #include <linux/slab.h>
  41 #include <linux/signal.h>
  42 #include <linux/poll.h>
  43 #include <linux/module.h>
  44 #include <linux/string.h>
  45 #include <linux/usb.h>
  46 #include <linux/usbdevice_fs.h>
  47 #include <linux/usb/hcd.h>      /* for usbcore internals */
  48 #include <linux/cdev.h>
  49 #include <linux/notifier.h>
  50 #include <linux/security.h>
  51 #include <linux/user_namespace.h>
  52 #include <linux/scatterlist.h>
  53 #include <linux/uaccess.h>
  54 #include <linux/dma-mapping.h>
  55 #include <asm/byteorder.h>
  56 #include <linux/moduleparam.h>
  57
  58 #include "usb.h"
  59
  60 #define USB_MAXBUS                      64
  61 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  62 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  63
  64 /* Mutual exclusion for removal, open, and release */
  65 DEFINE_MUTEX(usbfs_mutex);
  66
  67 struct usb_dev_state {
  68         struct list_head list;      /* state list */
  69         struct usb_device *dev;
  70         struct file *file;
  71         spinlock_t lock;            /* protects the async urb lists */
  72         struct list_head async_pending;
  73         struct list_head async_completed;
  74         struct list_head memory_list;
  75         wait_queue_head_t wait;     /* wake up if a request completed */
  76         unsigned int discsignr;
  77         struct pid *disc_pid;
  78         const struct cred *cred;
  79         void __user *disccontext;
  80         unsigned long ifclaimed;
  81         u32 secid;
  82         u32 disabled_bulk_eps;
  83         bool privileges_dropped;
  84         unsigned long interface_allowed_mask;
  85 };
  86
  87 struct usb_memory {
  88         struct list_head memlist;
  89         int vma_use_count;
  90         int urb_use_count;
  91         u32 size;
  92         void *mem;
  93         dma_addr_t dma_handle;
  94         unsigned long vm_start;
  95         struct usb_dev_state *ps;
  96 };
  97
  98 struct async {
  99         struct list_head asynclist;
 100         struct usb_dev_state *ps;
 101         struct pid *pid;
 102         const struct cred *cred;
 103         unsigned int signr;
 104         unsigned int ifnum;
 105         void __user *userbuffer;
 106         void __user *userurb;
 107         struct urb *urb;
 108         struct usb_memory *usbm;
 109         unsigned int mem_usage;
 110         int status;
 111         u32 secid;
 112         u8 bulk_addr;
 113         u8 bulk_status;
 114 };
 115
 116 static bool usbfs_snoop;
 117 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 118 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 119
 120 static unsigned usbfs_snoop_max = 65536;
 121 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 122 MODULE_PARM_DESC(usbfs_snoop_max,
 123                 "maximum number of bytes to print while snooping");
 124
 125 #define snoop(dev, format, arg...)                              \
 126         do {                                                    \
 127                 if (usbfs_snoop)                                \
 128                         dev_info(dev, format, ## arg);          \
 129         } while (0)
 130
 131 enum snoop_when {
 132         SUBMIT, COMPLETE
 133 };
 134
 135 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 136
 137 /* Limit on the total amount of memory we can allocate for transfers */
 138 static u32 usbfs_memory_mb = 16;
 139 module_param(usbfs_memory_mb, uint, 0644);
 140 MODULE_PARM_DESC(usbfs_memory_mb,
 141                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 142
 143 static atomic64_t 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;
 149
 150         lim = ACCESS_ONCE(usbfs_memory_mb);
 151         lim <<= 20;
 152
 153         atomic64_add(amount, &usbfs_memory_usage);
 154
 155         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 156                 atomic64_sub(amount, &usbfs_memory_usage);
 157                 return -ENOMEM;
 158         }
 159
 160         return 0;
 161 }
 162
 163 /* Memory for a transfer is being deallocated */
 164 static void usbfs_decrease_memory_usage(u64 amount)
 165 {
 166         atomic64_sub(amount, &usbfs_memory_usage);
 167 }
 168
 169 static int connected(struct usb_dev_state *ps)
 170 {
 171         return (!list_empty(&ps->list) &&
 172                         ps->dev->state != USB_STATE_NOTATTACHED);
 173 }
 174
 175 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 176 {
 177         struct usb_dev_state *ps = usbm->ps;
 178         unsigned long flags;
 179
 180         spin_lock_irqsave(&ps->lock, flags);
 181         --*count;
 182         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 183                 list_del(&usbm->memlist);
 184                 spin_unlock_irqrestore(&ps->lock, flags);
 185
 186                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 187                                 usbm->dma_handle);
 188                 usbfs_decrease_memory_usage(
 189                         usbm->size + sizeof(struct usb_memory));
 190                 kfree(usbm);
 191         } else {
 192                 spin_unlock_irqrestore(&ps->lock, flags);
 193         }
 194 }
 195
 196 static void usbdev_vm_open(struct vm_area_struct *vma)
 197 {
 198         struct usb_memory *usbm = vma->vm_private_data;
 199         unsigned long flags;
 200
 201         spin_lock_irqsave(&usbm->ps->lock, flags);
 202         ++usbm->vma_use_count;
 203         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 204 }
 205
 206 static void usbdev_vm_close(struct vm_area_struct *vma)
 207 {
 208         struct usb_memory *usbm = vma->vm_private_data;
 209
 210         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 211 }
 212
 213 static struct vm_operations_struct usbdev_vm_ops = {
 214         .open = usbdev_vm_open,
 215         .close = usbdev_vm_close
 216 };
 217
 218 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 219 {
 220         struct usb_memory *usbm = NULL;
 221         struct usb_dev_state *ps = file->private_data;
 222         size_t size = vma->vm_end - vma->vm_start;
 223         void *mem;
 224         unsigned long flags;
 225         dma_addr_t dma_handle;
 226         int ret;
 227
 228         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 229         if (ret)
 230                 goto error;
 231
 232         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 233         if (!usbm) {
 234                 ret = -ENOMEM;
 235                 goto error_decrease_mem;
 236         }
 237
 238         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 239                         &dma_handle);
 240         if (!mem) {
 241                 ret = -ENOMEM;
 242                 goto error_free_usbm;
 243         }
 244
 245         memset(mem, 0, size);
 246
 247         usbm->mem = mem;
 248         usbm->dma_handle = dma_handle;
 249         usbm->size = size;
 250         usbm->ps = ps;
 251         usbm->vm_start = vma->vm_start;
 252         usbm->vma_use_count = 1;
 253         INIT_LIST_HEAD(&usbm->memlist);
 254
 255         if (remap_pfn_range(vma, vma->vm_start,
 256                         virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 257                         size, vma->vm_page_prot) < 0) {
 258                 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 259                 return -EAGAIN;
 260         }
 261
 262         vma->vm_flags |= VM_IO;
 263         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 264         vma->vm_ops = &usbdev_vm_ops;
 265         vma->vm_private_data = usbm;
 266
 267         spin_lock_irqsave(&ps->lock, flags);
 268         list_add_tail(&usbm->memlist, &ps->memory_list);
 269         spin_unlock_irqrestore(&ps->lock, flags);
 270
 271         return 0;
 272
 273 error_free_usbm:
 274         kfree(usbm);
 275 error_decrease_mem:
 276         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 277 error:
 278         return ret;
 279 }
 280
 281 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 282                            loff_t *ppos)
 283 {
 284         struct usb_dev_state *ps = file->private_data;
 285         struct usb_device *dev = ps->dev;
 286         ssize_t ret = 0;
 287         unsigned len;
 288         loff_t pos;
 289         int i;
 290
 291         pos = *ppos;
 292         usb_lock_device(dev);
 293         if (!connected(ps)) {
 294                 ret = -ENODEV;
 295                 goto err;
 296         } else if (pos < 0) {
 297                 ret = -EINVAL;
 298                 goto err;
 299         }
 300
 301         if (pos < sizeof(struct usb_device_descriptor)) {
 302                 /* 18 bytes - fits on the stack */
 303                 struct usb_device_descriptor temp_desc;
 304
 305                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 306                 le16_to_cpus(&temp_desc.bcdUSB);
 307                 le16_to_cpus(&temp_desc.idVendor);
 308                 le16_to_cpus(&temp_desc.idProduct);
 309                 le16_to_cpus(&temp_desc.bcdDevice);
 310
 311                 len = sizeof(struct usb_device_descriptor) - pos;
 312                 if (len > nbytes)
 313                         len = nbytes;
 314                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 315                         ret = -EFAULT;
 316                         goto err;
 317                 }
 318
 319                 *ppos += len;
 320                 buf += len;
 321                 nbytes -= len;
 322                 ret += len;
 323         }
 324
 325         pos = sizeof(struct usb_device_descriptor);
 326         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 327                 struct usb_config_descriptor *config =
 328                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 329                 unsigned int length = le16_to_cpu(config->wTotalLength);
 330
 331                 if (*ppos < pos + length) {
 332
 333                         /* The descriptor may claim to be longer than it
 334                          * really is.  Here is the actual allocated length. */
 335                         unsigned alloclen =
 336                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 337
 338                         len = length - (*ppos - pos);
 339                         if (len > nbytes)
 340                                 len = nbytes;
 341
 342                         /* Simply don't write (skip over) unallocated parts */
 343                         if (alloclen > (*ppos - pos)) {
 344                                 alloclen -= (*ppos - pos);
 345                                 if (copy_to_user(buf,
 346                                     dev->rawdescriptors[i] + (*ppos - pos),
 347                                     min(len, alloclen))) {
 348                                         ret = -EFAULT;
 349                                         goto err;
 350                                 }
 351                         }
 352
 353                         *ppos += len;
 354                         buf += len;
 355                         nbytes -= len;
 356                         ret += len;
 357                 }
 358
 359                 pos += length;
 360         }
 361
 362 err:
 363         usb_unlock_device(dev);
 364         return ret;
 365 }
 366
 367 /*
 368  * async list handling
 369  */
 370
 371 static struct async *alloc_async(unsigned int numisoframes)
 372 {
 373         struct async *as;
 374
 375         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 376         if (!as)
 377                 return NULL;
 378         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 379         if (!as->urb) {
 380                 kfree(as);
 381                 return NULL;
 382         }
 383         return as;
 384 }
 385
 386 static void free_async(struct async *as)
 387 {
 388         int i;
 389
 390         put_pid(as->pid);
 391         if (as->cred)
 392                 put_cred(as->cred);
 393         for (i = 0; i < as->urb->num_sgs; i++) {
 394                 if (sg_page(&as->urb->sg[i]))
 395                         kfree(sg_virt(&as->urb->sg[i]));
 396         }
 397
 398         kfree(as->urb->sg);
 399         if (as->usbm == NULL)
 400                 kfree(as->urb->transfer_buffer);
 401         else
 402                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 403
 404         kfree(as->urb->setup_packet);
 405         usb_free_urb(as->urb);
 406         usbfs_decrease_memory_usage(as->mem_usage);
 407         kfree(as);
 408 }
 409
 410 static void async_newpending(struct async *as)
 411 {
 412         struct usb_dev_state *ps = as->ps;
 413         unsigned long flags;
 414
 415         spin_lock_irqsave(&ps->lock, flags);
 416         list_add_tail(&as->asynclist, &ps->async_pending);
 417         spin_unlock_irqrestore(&ps->lock, flags);
 418 }
 419
 420 static void async_removepending(struct async *as)
 421 {
 422         struct usb_dev_state *ps = as->ps;
 423         unsigned long flags;
 424
 425         spin_lock_irqsave(&ps->lock, flags);
 426         list_del_init(&as->asynclist);
 427         spin_unlock_irqrestore(&ps->lock, flags);
 428 }
 429
 430 static struct async *async_getcompleted(struct usb_dev_state *ps)
 431 {
 432         unsigned long flags;
 433         struct async *as = NULL;
 434
 435         spin_lock_irqsave(&ps->lock, flags);
 436         if (!list_empty(&ps->async_completed)) {
 437                 as = list_entry(ps->async_completed.next, struct async,
 438                                 asynclist);
 439                 list_del_init(&as->asynclist);
 440         }
 441         spin_unlock_irqrestore(&ps->lock, flags);
 442         return as;
 443 }
 444
 445 static struct async *async_getpending(struct usb_dev_state *ps,
 446                                              void __user *userurb)
 447 {
 448         struct async *as;
 449
 450         list_for_each_entry(as, &ps->async_pending, asynclist)
 451                 if (as->userurb == userurb) {
 452                         list_del_init(&as->asynclist);
 453                         return as;
 454                 }
 455
 456         return NULL;
 457 }
 458
 459 static void snoop_urb(struct usb_device *udev,
 460                 void __user *userurb, int pipe, unsigned length,
 461                 int timeout_or_status, enum snoop_when when,
 462                 unsigned char *data, unsigned data_len)
 463 {
 464         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 465         static const char *dirs[] = {"out", "in"};
 466         int ep;
 467         const char *t, *d;
 468
 469         if (!usbfs_snoop)
 470                 return;
 471
 472         ep = usb_pipeendpoint(pipe);
 473         t = types[usb_pipetype(pipe)];
 474         d = dirs[!!usb_pipein(pipe)];
 475
 476         if (userurb) {          /* Async */
 477                 if (when == SUBMIT)
 478                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 479                                         "length %u\n",
 480                                         userurb, ep, t, d, length);
 481                 else
 482                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 483                                         "actual_length %u status %d\n",
 484                                         userurb, ep, t, d, length,
 485                                         timeout_or_status);
 486         } else {
 487                 if (when == SUBMIT)
 488                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 489                                         "timeout %d\n",
 490                                         ep, t, d, length, timeout_or_status);
 491                 else
 492                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 493                                         "status %d\n",
 494                                         ep, t, d, length, timeout_or_status);
 495         }
 496
 497         data_len = min(data_len, usbfs_snoop_max);
 498         if (data && data_len > 0) {
 499                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 500                         data, data_len, 1);
 501         }
 502 }
 503
 504 static void snoop_urb_data(struct urb *urb, unsigned len)
 505 {
 506         int i, size;
 507
 508         len = min(len, usbfs_snoop_max);
 509         if (!usbfs_snoop || len == 0)
 510                 return;
 511
 512         if (urb->num_sgs == 0) {
 513                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 514                         urb->transfer_buffer, len, 1);
 515                 return;
 516         }
 517
 518         for (i = 0; i < urb->num_sgs && len; i++) {
 519                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 520                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 521                         sg_virt(&urb->sg[i]), size, 1);
 522                 len -= size;
 523         }
 524 }
 525
 526 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 527 {
 528         unsigned i, len, size;
 529
 530         if (urb->number_of_packets > 0)         /* Isochronous */
 531                 len = urb->transfer_buffer_length;
 532         else                                    /* Non-Isoc */
 533                 len = urb->actual_length;
 534
 535         if (urb->num_sgs == 0) {
 536                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 537                         return -EFAULT;
 538                 return 0;
 539         }
 540
 541         for (i = 0; i < urb->num_sgs && len; i++) {
 542                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 543                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 544                         return -EFAULT;
 545                 userbuffer += size;
 546                 len -= size;
 547         }
 548
 549         return 0;
 550 }
 551
 552 #define AS_CONTINUATION 1
 553 #define AS_UNLINK       2
 554
 555 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 556 __releases(ps->lock)
 557 __acquires(ps->lock)
 558 {
 559         struct urb *urb;
 560         struct async *as;
 561
 562         /* Mark all the pending URBs that match bulk_addr, up to but not
 563          * including the first one without AS_CONTINUATION.  If such an
 564          * URB is encountered then a new transfer has already started so
 565          * the endpoint doesn't need to be disabled; otherwise it does.
 566          */
 567         list_for_each_entry(as, &ps->async_pending, asynclist) {
 568                 if (as->bulk_addr == bulk_addr) {
 569                         if (as->bulk_status != AS_CONTINUATION)
 570                                 goto rescan;
 571                         as->bulk_status = AS_UNLINK;
 572                         as->bulk_addr = 0;
 573                 }
 574         }
 575         ps->disabled_bulk_eps |= (1 << bulk_addr);
 576
 577         /* Now carefully unlink all the marked pending URBs */
 578  rescan:
 579         list_for_each_entry(as, &ps->async_pending, asynclist) {
 580                 if (as->bulk_status == AS_UNLINK) {
 581                         as->bulk_status = 0;            /* Only once */
 582                         urb = as->urb;
 583                         usb_get_urb(urb);
 584                         spin_unlock(&ps->lock);         /* Allow completions */
 585                         usb_unlink_urb(urb);
 586                         usb_put_urb(urb);
 587                         spin_lock(&ps->lock);
 588                         goto rescan;
 589                 }
 590         }
 591 }
 592
 593 static void async_completed(struct urb *urb)
 594 {
 595         struct async *as = urb->context;
 596         struct usb_dev_state *ps = as->ps;
 597         struct siginfo sinfo;
 598         struct pid *pid = NULL;
 599         u32 secid = 0;
 600         const struct cred *cred = NULL;
 601         int signr;
 602
 603         spin_lock(&ps->lock);
 604         list_move_tail(&as->asynclist, &ps->async_completed);
 605         as->status = urb->status;
 606         signr = as->signr;
 607         if (signr) {
 608                 memset(&sinfo, 0, sizeof(sinfo));
 609                 sinfo.si_signo = as->signr;
 610                 sinfo.si_errno = as->status;
 611                 sinfo.si_code = SI_ASYNCIO;
 612                 sinfo.si_addr = as->userurb;
 613                 pid = get_pid(as->pid);
 614                 cred = get_cred(as->cred);
 615                 secid = as->secid;
 616         }
 617         snoop(&urb->dev->dev, "urb complete\n");
 618         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 619                         as->status, COMPLETE, NULL, 0);
 620         if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
 621                 snoop_urb_data(urb, urb->actual_length);
 622
 623         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 624                         as->status != -ENOENT)
 625                 cancel_bulk_urbs(ps, as->bulk_addr);
 626         spin_unlock(&ps->lock);
 627
 628         if (signr) {
 629                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 630                 put_pid(pid);
 631                 put_cred(cred);
 632         }
 633
 634         wake_up(&ps->wait);
 635 }
 636
 637 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 638 {
 639         struct urb *urb;
 640         struct async *as;
 641         unsigned long flags;
 642
 643         spin_lock_irqsave(&ps->lock, flags);
 644         while (!list_empty(list)) {
 645                 as = list_entry(list->next, struct async, asynclist);
 646                 list_del_init(&as->asynclist);
 647                 urb = as->urb;
 648                 usb_get_urb(urb);
 649
 650                 /* drop the spinlock so the completion handler can run */
 651                 spin_unlock_irqrestore(&ps->lock, flags);
 652                 usb_kill_urb(urb);
 653                 usb_put_urb(urb);
 654                 spin_lock_irqsave(&ps->lock, flags);
 655         }
 656         spin_unlock_irqrestore(&ps->lock, flags);
 657 }
 658
 659 static void destroy_async_on_interface(struct usb_dev_state *ps,
 660                                        unsigned int ifnum)
 661 {
 662         struct list_head *p, *q, hitlist;
 663         unsigned long flags;
 664
 665         INIT_LIST_HEAD(&hitlist);
 666         spin_lock_irqsave(&ps->lock, flags);
 667         list_for_each_safe(p, q, &ps->async_pending)
 668                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 669                         list_move_tail(p, &hitlist);
 670         spin_unlock_irqrestore(&ps->lock, flags);
 671         destroy_async(ps, &hitlist);
 672 }
 673
 674 static void destroy_all_async(struct usb_dev_state *ps)
 675 {
 676         destroy_async(ps, &ps->async_pending);
 677 }
 678
 679 /*
 680  * interface claims are made only at the request of user level code,
 681  * which can also release them (explicitly or by closing files).
 682  * they're also undone when devices disconnect.
 683  */
 684
 685 static int driver_probe(struct usb_interface *intf,
 686                         const struct usb_device_id *id)
 687 {
 688         return -ENODEV;
 689 }
 690
 691 static void driver_disconnect(struct usb_interface *intf)
 692 {
 693         struct usb_dev_state *ps = usb_get_intfdata(intf);
 694         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 695
 696         if (!ps)
 697                 return;
 698
 699         /* NOTE:  this relies on usbcore having canceled and completed
 700          * all pending I/O requests; 2.6 does that.
 701          */
 702
 703         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 704                 clear_bit(ifnum, &ps->ifclaimed);
 705         else
 706                 dev_warn(&intf->dev, "interface number %u out of range\n",
 707                          ifnum);
 708
 709         usb_set_intfdata(intf, NULL);
 710
 711         /* force async requests to complete */
 712         destroy_async_on_interface(ps, ifnum);
 713 }
 714
 715 /* The following routines are merely placeholders.  There is no way
 716  * to inform a user task about suspend or resumes.
 717  */
 718 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 719 {
 720         return 0;
 721 }
 722
 723 static int driver_resume(struct usb_interface *intf)
 724 {
 725         return 0;
 726 }
 727
 728 struct usb_driver usbfs_driver = {
 729         .name =         "usbfs",
 730         .probe =        driver_probe,
 731         .disconnect =   driver_disconnect,
 732         .suspend =      driver_suspend,
 733         .resume =       driver_resume,
 734 };
 735
 736 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 737 {
 738         struct usb_device *dev = ps->dev;
 739         struct usb_interface *intf;
 740         int err;
 741
 742         if (ifnum >= 8*sizeof(ps->ifclaimed))
 743                 return -EINVAL;
 744         /* already claimed */
 745         if (test_bit(ifnum, &ps->ifclaimed))
 746                 return 0;
 747
 748         if (ps->privileges_dropped &&
 749                         !test_bit(ifnum, &ps->interface_allowed_mask))
 750                 return -EACCES;
 751
 752         intf = usb_ifnum_to_if(dev, ifnum);
 753         if (!intf)
 754                 err = -ENOENT;
 755         else
 756                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 757         if (err == 0)
 758                 set_bit(ifnum, &ps->ifclaimed);
 759         return err;
 760 }
 761
 762 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 763 {
 764         struct usb_device *dev;
 765         struct usb_interface *intf;
 766         int err;
 767
 768         err = -EINVAL;
 769         if (ifnum >= 8*sizeof(ps->ifclaimed))
 770                 return err;
 771         dev = ps->dev;
 772         intf = usb_ifnum_to_if(dev, ifnum);
 773         if (!intf)
 774                 err = -ENOENT;
 775         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 776                 usb_driver_release_interface(&usbfs_driver, intf);
 777                 err = 0;
 778         }
 779         return err;
 780 }
 781
 782 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 783 {
 784         if (ps->dev->state != USB_STATE_CONFIGURED)
 785                 return -EHOSTUNREACH;
 786         if (ifnum >= 8*sizeof(ps->ifclaimed))
 787                 return -EINVAL;
 788         if (test_bit(ifnum, &ps->ifclaimed))
 789                 return 0;
 790         /* if not yet claimed, claim it for the driver */
 791         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 792                  "interface %u before use\n", task_pid_nr(current),
 793                  current->comm, ifnum);
 794         return claimintf(ps, ifnum);
 795 }
 796
 797 static int findintfep(struct usb_device *dev, unsigned int ep)
 798 {
 799         unsigned int i, j, e;
 800         struct usb_interface *intf;
 801         struct usb_host_interface *alts;
 802         struct usb_endpoint_descriptor *endpt;
 803
 804         if (ep & ~(USB_DIR_IN|0xf))
 805                 return -EINVAL;
 806         if (!dev->actconfig)
 807                 return -ESRCH;
 808         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 809                 intf = dev->actconfig->interface[i];
 810                 for (j = 0; j < intf->num_altsetting; j++) {
 811                         alts = &intf->altsetting[j];
 812                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 813                                 endpt = &alts->endpoint[e].desc;
 814                                 if (endpt->bEndpointAddress == ep)
 815                                         return alts->desc.bInterfaceNumber;
 816                         }
 817                 }
 818         }
 819         return -ENOENT;
 820 }
 821
 822 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 823                            unsigned int request, unsigned int index)
 824 {
 825         int ret = 0;
 826         struct usb_host_interface *alt_setting;
 827
 828         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 829          && ps->dev->state != USB_STATE_ADDRESS
 830          && ps->dev->state != USB_STATE_CONFIGURED)
 831                 return -EHOSTUNREACH;
 832         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 833                 return 0;
 834
 835         /*
 836          * check for the special corner case 'get_device_id' in the printer
 837          * class specification, which we always want to allow as it is used
 838          * to query things like ink level, etc.
 839          */
 840         if (requesttype == 0xa1 && request == 0) {
 841                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 842                                                    index >> 8, index & 0xff);
 843                 if (alt_setting
 844                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 845                         return 0;
 846         }
 847
 848         index &= 0xff;
 849         switch (requesttype & USB_RECIP_MASK) {
 850         case USB_RECIP_ENDPOINT:
 851                 if ((index & ~USB_DIR_IN) == 0)
 852                         return 0;
 853                 ret = findintfep(ps->dev, index);
 854                 if (ret < 0) {
 855                         /*
 856                          * Some not fully compliant Win apps seem to get
 857                          * index wrong and have the endpoint number here
 858                          * rather than the endpoint address (with the
 859                          * correct direction). Win does let this through,
 860                          * so we'll not reject it here but leave it to
 861                          * the device to not break KVM. But we warn.
 862                          */
 863                         ret = findintfep(ps->dev, index ^ 0x80);
 864                         if (ret >= 0)
 865                                 dev_info(&ps->dev->dev,
 866                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 867                                         __func__, task_pid_nr(current),
 868                                         current->comm, index, index ^ 0x80);
 869                 }
 870                 if (ret >= 0)
 871                         ret = checkintf(ps, ret);
 872                 break;
 873
 874         case USB_RECIP_INTERFACE:
 875                 ret = checkintf(ps, index);
 876                 break;
 877         }
 878         return ret;
 879 }
 880
 881 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 882                                                      unsigned char ep)
 883 {
 884         if (ep & USB_ENDPOINT_DIR_MASK)
 885                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 886         else
 887                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 888 }
 889
 890 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 891                                   struct usbdevfs_streams __user *streams,
 892                                   unsigned int *num_streams_ret,
 893                                   unsigned int *num_eps_ret,
 894                                   struct usb_host_endpoint ***eps_ret,
 895                                   struct usb_interface **intf_ret)
 896 {
 897         unsigned int i, num_streams, num_eps;
 898         struct usb_host_endpoint **eps;
 899         struct usb_interface *intf = NULL;
 900         unsigned char ep;
 901         int ifnum, ret;
 902
 903         if (get_user(num_streams, &streams->num_streams) ||
 904             get_user(num_eps, &streams->num_eps))
 905                 return -EFAULT;
 906
 907         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 908                 return -EINVAL;
 909
 910         /* The XHCI controller allows max 2 ^ 16 streams */
 911         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 912                 return -EINVAL;
 913
 914         eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
 915         if (!eps)
 916                 return -ENOMEM;
 917
 918         for (i = 0; i < num_eps; i++) {
 919                 if (get_user(ep, &streams->eps[i])) {
 920                         ret = -EFAULT;
 921                         goto error;
 922                 }
 923                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 924                 if (!eps[i]) {
 925                         ret = -EINVAL;
 926                         goto error;
 927                 }
 928
 929                 /* usb_alloc/free_streams operate on an usb_interface */
 930                 ifnum = findintfep(ps->dev, ep);
 931                 if (ifnum < 0) {
 932                         ret = ifnum;
 933                         goto error;
 934                 }
 935
 936                 if (i == 0) {
 937                         ret = checkintf(ps, ifnum);
 938                         if (ret < 0)
 939                                 goto error;
 940                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 941                 } else {
 942                         /* Verify all eps belong to the same interface */
 943                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 944                                 ret = -EINVAL;
 945                                 goto error;
 946                         }
 947                 }
 948         }
 949
 950         if (num_streams_ret)
 951                 *num_streams_ret = num_streams;
 952         *num_eps_ret = num_eps;
 953         *eps_ret = eps;
 954         *intf_ret = intf;
 955
 956         return 0;
 957
 958 error:
 959         kfree(eps);
 960         return ret;
 961 }
 962
 963 static int match_devt(struct device *dev, void *data)
 964 {
 965         return dev->devt == (dev_t) (unsigned long) data;
 966 }
 967
 968 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 969 {
 970         struct device *dev;
 971
 972         dev = bus_find_device(&usb_bus_type, NULL,
 973                               (void *) (unsigned long) devt, match_devt);
 974         if (!dev)
 975                 return NULL;
 976         return to_usb_device(dev);
 977 }
 978
 979 /*
 980  * file operations
 981  */
 982 static int usbdev_open(struct inode *inode, struct file *file)
 983 {
 984         struct usb_device *dev = NULL;
 985         struct usb_dev_state *ps;
 986         int ret;
 987
 988         ret = -ENOMEM;
 989         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
 990         if (!ps)
 991                 goto out_free_ps;
 992
 993         ret = -ENODEV;
 994
 995         /* Protect against simultaneous removal or release */
 996         mutex_lock(&usbfs_mutex);
 997
 998         /* usbdev device-node */
 999         if (imajor(inode) == USB_DEVICE_MAJOR)
1000                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1001
1002         mutex_unlock(&usbfs_mutex);
1003
1004         if (!dev)
1005                 goto out_free_ps;
1006
1007         usb_lock_device(dev);
1008         if (dev->state == USB_STATE_NOTATTACHED)
1009                 goto out_unlock_device;
1010
1011         ret = usb_autoresume_device(dev);
1012         if (ret)
1013                 goto out_unlock_device;
1014
1015         ps->dev = dev;
1016         ps->file = file;
1017         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1018         spin_lock_init(&ps->lock);
1019         INIT_LIST_HEAD(&ps->list);
1020         INIT_LIST_HEAD(&ps->async_pending);
1021         INIT_LIST_HEAD(&ps->async_completed);
1022         INIT_LIST_HEAD(&ps->memory_list);
1023         init_waitqueue_head(&ps->wait);
1024         ps->disc_pid = get_pid(task_pid(current));
1025         ps->cred = get_current_cred();
1026         security_task_getsecid(current, &ps->secid);
1027         smp_wmb();
1028         list_add_tail(&ps->list, &dev->filelist);
1029         file->private_data = ps;
1030         usb_unlock_device(dev);
1031         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1032                         current->comm);
1033         return ret;
1034
1035  out_unlock_device:
1036         usb_unlock_device(dev);
1037         usb_put_dev(dev);
1038  out_free_ps:
1039         kfree(ps);
1040         return ret;
1041 }
1042
1043 static int usbdev_release(struct inode *inode, struct file *file)
1044 {
1045         struct usb_dev_state *ps = file->private_data;
1046         struct usb_device *dev = ps->dev;
1047         unsigned int ifnum;
1048         struct async *as;
1049
1050         usb_lock_device(dev);
1051         usb_hub_release_all_ports(dev, ps);
1052
1053         list_del_init(&ps->list);
1054
1055         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1056                         ifnum++) {
1057                 if (test_bit(ifnum, &ps->ifclaimed))
1058                         releaseintf(ps, ifnum);
1059         }
1060         destroy_all_async(ps);
1061         usb_autosuspend_device(dev);
1062         usb_unlock_device(dev);
1063         usb_put_dev(dev);
1064         put_pid(ps->disc_pid);
1065         put_cred(ps->cred);
1066
1067         as = async_getcompleted(ps);
1068         while (as) {
1069                 free_async(as);
1070                 as = async_getcompleted(ps);
1071         }
1072
1073         kfree(ps);
1074         return 0;
1075 }
1076
1077 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1078 {
1079         struct usb_device *dev = ps->dev;
1080         struct usbdevfs_ctrltransfer ctrl;
1081         unsigned int tmo;
1082         unsigned char *tbuf;
1083         unsigned wLength;
1084         int i, pipe, ret;
1085
1086         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1087                 return -EFAULT;
1088         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1089                               ctrl.wIndex);
1090         if (ret)
1091                 return ret;
1092         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
1093         if (wLength > PAGE_SIZE)
1094                 return -EINVAL;
1095         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1096                         sizeof(struct usb_ctrlrequest));
1097         if (ret)
1098                 return ret;
1099         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1100         if (!tbuf) {
1101                 ret = -ENOMEM;
1102                 goto done;
1103         }
1104         tmo = ctrl.timeout;
1105         snoop(&dev->dev, "control urb: bRequestType=%02x "
1106                 "bRequest=%02x wValue=%04x "
1107                 "wIndex=%04x wLength=%04x\n",
1108                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1109                 ctrl.wIndex, ctrl.wLength);
1110         if (ctrl.bRequestType & 0x80) {
1111                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1112                                                ctrl.wLength)) {
1113                         ret = -EINVAL;
1114                         goto done;
1115                 }
1116                 pipe = usb_rcvctrlpipe(dev, 0);
1117                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1118
1119                 usb_unlock_device(dev);
1120                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1121                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1122                                     tbuf, ctrl.wLength, tmo);
1123                 usb_lock_device(dev);
1124                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1125                           tbuf, max(i, 0));
1126                 if ((i > 0) && ctrl.wLength) {
1127                         if (copy_to_user(ctrl.data, tbuf, i)) {
1128                                 ret = -EFAULT;
1129                                 goto done;
1130                         }
1131                 }
1132         } else {
1133                 if (ctrl.wLength) {
1134                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1135                                 ret = -EFAULT;
1136                                 goto done;
1137                         }
1138                 }
1139                 pipe = usb_sndctrlpipe(dev, 0);
1140                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1141                         tbuf, ctrl.wLength);
1142
1143                 usb_unlock_device(dev);
1144                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1145                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1146                                     tbuf, ctrl.wLength, tmo);
1147                 usb_lock_device(dev);
1148                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1149         }
1150         if (i < 0 && i != -EPIPE) {
1151                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1152                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1153                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1154                            ctrl.wLength, i);
1155         }
1156         ret = i;
1157  done:
1158         free_page((unsigned long) tbuf);
1159         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1160                         sizeof(struct usb_ctrlrequest));
1161         return ret;
1162 }
1163
1164 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1165 {
1166         struct usb_device *dev = ps->dev;
1167         struct usbdevfs_bulktransfer bulk;
1168         unsigned int tmo, len1, pipe;
1169         int len2;
1170         unsigned char *tbuf;
1171         int i, ret;
1172
1173         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1174                 return -EFAULT;
1175         ret = findintfep(ps->dev, bulk.ep);
1176         if (ret < 0)
1177                 return ret;
1178         ret = checkintf(ps, ret);
1179         if (ret)
1180                 return ret;
1181         if (bulk.ep & USB_DIR_IN)
1182                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1183         else
1184                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1185         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1186                 return -EINVAL;
1187         len1 = bulk.len;
1188         if (len1 >= (INT_MAX - sizeof(struct urb)))
1189                 return -EINVAL;
1190         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1191         if (ret)
1192                 return ret;
1193         tbuf = kmalloc(len1, GFP_KERNEL);
1194         if (!tbuf) {
1195                 ret = -ENOMEM;
1196                 goto done;
1197         }
1198         tmo = bulk.timeout;
1199         if (bulk.ep & 0x80) {
1200                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1201                         ret = -EINVAL;
1202                         goto done;
1203                 }
1204                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1205
1206                 usb_unlock_device(dev);
1207                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1208                 usb_lock_device(dev);
1209                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1210
1211                 if (!i && len2) {
1212                         if (copy_to_user(bulk.data, tbuf, len2)) {
1213                                 ret = -EFAULT;
1214                                 goto done;
1215                         }
1216                 }
1217         } else {
1218                 if (len1) {
1219                         if (copy_from_user(tbuf, bulk.data, len1)) {
1220                                 ret = -EFAULT;
1221                                 goto done;
1222                         }
1223                 }
1224                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1225
1226                 usb_unlock_device(dev);
1227                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1228                 usb_lock_device(dev);
1229                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1230         }
1231         ret = (i < 0 ? i : len2);
1232  done:
1233         kfree(tbuf);
1234         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1235         return ret;
1236 }
1237
1238 static void check_reset_of_active_ep(struct usb_device *udev,
1239                 unsigned int epnum, char *ioctl_name)
1240 {
1241         struct usb_host_endpoint **eps;
1242         struct usb_host_endpoint *ep;
1243
1244         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1245         ep = eps[epnum & 0x0f];
1246         if (ep && !list_empty(&ep->urb_list))
1247                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1248                                 task_pid_nr(current), current->comm,
1249                                 ioctl_name, epnum);
1250 }
1251
1252 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1253 {
1254         unsigned int ep;
1255         int ret;
1256
1257         if (get_user(ep, (unsigned int __user *)arg))
1258                 return -EFAULT;
1259         ret = findintfep(ps->dev, ep);
1260         if (ret < 0)
1261                 return ret;
1262         ret = checkintf(ps, ret);
1263         if (ret)
1264                 return ret;
1265         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1266         usb_reset_endpoint(ps->dev, ep);
1267         return 0;
1268 }
1269
1270 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1271 {
1272         unsigned int ep;
1273         int pipe;
1274         int ret;
1275
1276         if (get_user(ep, (unsigned int __user *)arg))
1277                 return -EFAULT;
1278         ret = findintfep(ps->dev, ep);
1279         if (ret < 0)
1280                 return ret;
1281         ret = checkintf(ps, ret);
1282         if (ret)
1283                 return ret;
1284         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1285         if (ep & USB_DIR_IN)
1286                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1287         else
1288                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1289
1290         return usb_clear_halt(ps->dev, pipe);
1291 }
1292
1293 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1294 {
1295         struct usbdevfs_getdriver gd;
1296         struct usb_interface *intf;
1297         int ret;
1298
1299         if (copy_from_user(&gd, arg, sizeof(gd)))
1300                 return -EFAULT;
1301         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1302         if (!intf || !intf->dev.driver)
1303                 ret = -ENODATA;
1304         else {
1305                 strlcpy(gd.driver, intf->dev.driver->name,
1306                                 sizeof(gd.driver));
1307                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1308         }
1309         return ret;
1310 }
1311
1312 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1313 {
1314         struct usbdevfs_connectinfo ci;
1315
1316         memset(&ci, 0, sizeof(ci));
1317         ci.devnum = ps->dev->devnum;
1318         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1319
1320         if (copy_to_user(arg, &ci, sizeof(ci)))
1321                 return -EFAULT;
1322         return 0;
1323 }
1324
1325 static int proc_resetdevice(struct usb_dev_state *ps)
1326 {
1327         struct usb_host_config *actconfig = ps->dev->actconfig;
1328         struct usb_interface *interface;
1329         int i, number;
1330
1331         /* Don't allow a device reset if the process has dropped the
1332          * privilege to do such things and any of the interfaces are
1333          * currently claimed.
1334          */
1335         if (ps->privileges_dropped && actconfig) {
1336                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1337                         interface = actconfig->interface[i];
1338                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1339                         if (usb_interface_claimed(interface) &&
1340                                         !test_bit(number, &ps->ifclaimed)) {
1341                                 dev_warn(&ps->dev->dev,
1342                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1343                                         number, interface->dev.driver->name, current->comm);
1344                                 return -EACCES;
1345                         }
1346                 }
1347         }
1348
1349         return usb_reset_device(ps->dev);
1350 }
1351
1352 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1353 {
1354         struct usbdevfs_setinterface setintf;
1355         int ret;
1356
1357         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1358                 return -EFAULT;
1359         ret = checkintf(ps, setintf.interface);
1360         if (ret)
1361                 return ret;
1362
1363         destroy_async_on_interface(ps, setintf.interface);
1364
1365         return usb_set_interface(ps->dev, setintf.interface,
1366                         setintf.altsetting);
1367 }
1368
1369 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1370 {
1371         int u;
1372         int status = 0;
1373         struct usb_host_config *actconfig;
1374
1375         if (get_user(u, (int __user *)arg))
1376                 return -EFAULT;
1377
1378         actconfig = ps->dev->actconfig;
1379
1380         /* Don't touch the device if any interfaces are claimed.
1381          * It could interfere with other drivers' operations, and if
1382          * an interface is claimed by usbfs it could easily deadlock.
1383          */
1384         if (actconfig) {
1385                 int i;
1386
1387                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1388                         if (usb_interface_claimed(actconfig->interface[i])) {
1389                                 dev_warn(&ps->dev->dev,
1390                                         "usbfs: interface %d claimed by %s "
1391                                         "while '%s' sets config #%d\n",
1392                                         actconfig->interface[i]
1393                                                 ->cur_altsetting
1394                                                 ->desc.bInterfaceNumber,
1395                                         actconfig->interface[i]
1396                                                 ->dev.driver->name,
1397                                         current->comm, u);
1398                                 status = -EBUSY;
1399                                 break;
1400                         }
1401                 }
1402         }
1403
1404         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1405          * so avoid usb_set_configuration()'s kick to sysfs
1406          */
1407         if (status == 0) {
1408                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1409                         status = usb_reset_configuration(ps->dev);
1410                 else
1411                         status = usb_set_configuration(ps->dev, u);
1412         }
1413
1414         return status;
1415 }
1416
1417 static struct usb_memory *
1418 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1419 {
1420         struct usb_memory *usbm = NULL, *iter;
1421         unsigned long flags;
1422         unsigned long uurb_start = (unsigned long)uurb->buffer;
1423
1424         spin_lock_irqsave(&ps->lock, flags);
1425         list_for_each_entry(iter, &ps->memory_list, memlist) {
1426                 if (uurb_start >= iter->vm_start &&
1427                                 uurb_start < iter->vm_start + iter->size) {
1428                         if (uurb->buffer_length > iter->vm_start + iter->size -
1429                                         uurb_start) {
1430                                 usbm = ERR_PTR(-EINVAL);
1431                         } else {
1432                                 usbm = iter;
1433                                 usbm->urb_use_count++;
1434                         }
1435                         break;
1436                 }
1437         }
1438         spin_unlock_irqrestore(&ps->lock, flags);
1439         return usbm;
1440 }
1441
1442 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1443                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1444                         void __user *arg)
1445 {
1446         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1447         struct usb_host_endpoint *ep;
1448         struct async *as = NULL;
1449         struct usb_ctrlrequest *dr = NULL;
1450         unsigned int u, totlen, isofrmlen;
1451         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1452         int number_of_packets = 0;
1453         unsigned int stream_id = 0;
1454         void *buf;
1455
1456         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1457                                 USBDEVFS_URB_SHORT_NOT_OK |
1458                                 USBDEVFS_URB_BULK_CONTINUATION |
1459                                 USBDEVFS_URB_NO_FSBR |
1460                                 USBDEVFS_URB_ZERO_PACKET |
1461                                 USBDEVFS_URB_NO_INTERRUPT))
1462                 return -EINVAL;
1463         if (uurb->buffer_length > 0 && !uurb->buffer)
1464                 return -EINVAL;
1465         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1466             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1467                 ifnum = findintfep(ps->dev, uurb->endpoint);
1468                 if (ifnum < 0)
1469                         return ifnum;
1470                 ret = checkintf(ps, ifnum);
1471                 if (ret)
1472                         return ret;
1473         }
1474         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1475         if (!ep)
1476                 return -ENOENT;
1477         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1478
1479         u = 0;
1480         switch (uurb->type) {
1481         case USBDEVFS_URB_TYPE_CONTROL:
1482                 if (!usb_endpoint_xfer_control(&ep->desc))
1483                         return -EINVAL;
1484                 /* min 8 byte setup packet */
1485                 if (uurb->buffer_length < 8)
1486                         return -EINVAL;
1487                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1488                 if (!dr)
1489                         return -ENOMEM;
1490                 if (copy_from_user(dr, uurb->buffer, 8)) {
1491                         ret = -EFAULT;
1492                         goto error;
1493                 }
1494                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1495                         ret = -EINVAL;
1496                         goto error;
1497                 }
1498                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1499                                       le16_to_cpup(&dr->wIndex));
1500                 if (ret)
1501                         goto error;
1502                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1503                 uurb->buffer += 8;
1504                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1505                         is_in = 1;
1506                         uurb->endpoint |= USB_DIR_IN;
1507                 } else {
1508                         is_in = 0;
1509                         uurb->endpoint &= ~USB_DIR_IN;
1510                 }
1511                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1512                         "bRequest=%02x wValue=%04x "
1513                         "wIndex=%04x wLength=%04x\n",
1514                         dr->bRequestType, dr->bRequest,
1515                         __le16_to_cpup(&dr->wValue),
1516                         __le16_to_cpup(&dr->wIndex),
1517                         __le16_to_cpup(&dr->wLength));
1518                 u = sizeof(struct usb_ctrlrequest);
1519                 break;
1520
1521         case USBDEVFS_URB_TYPE_BULK:
1522                 switch (usb_endpoint_type(&ep->desc)) {
1523                 case USB_ENDPOINT_XFER_CONTROL:
1524                 case USB_ENDPOINT_XFER_ISOC:
1525                         return -EINVAL;
1526                 case USB_ENDPOINT_XFER_INT:
1527                         /* allow single-shot interrupt transfers */
1528                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1529                         goto interrupt_urb;
1530                 }
1531                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1532                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1533                         num_sgs = 0;
1534                 if (ep->streams)
1535                         stream_id = uurb->stream_id;
1536                 break;
1537
1538         case USBDEVFS_URB_TYPE_INTERRUPT:
1539                 if (!usb_endpoint_xfer_int(&ep->desc))
1540                         return -EINVAL;
1541  interrupt_urb:
1542                 break;
1543
1544         case USBDEVFS_URB_TYPE_ISO:
1545                 /* arbitrary limit */
1546                 if (uurb->number_of_packets < 1 ||
1547                     uurb->number_of_packets > 128)
1548                         return -EINVAL;
1549                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1550                         return -EINVAL;
1551                 number_of_packets = uurb->number_of_packets;
1552                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1553                                    number_of_packets;
1554                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1555                 if (IS_ERR(isopkt)) {
1556                         ret = PTR_ERR(isopkt);
1557                         isopkt = NULL;
1558                         goto error;
1559                 }
1560                 for (totlen = u = 0; u < number_of_packets; u++) {
1561                         /*
1562                          * arbitrary limit need for USB 3.0
1563                          * bMaxBurst (0~15 allowed, 1~16 packets)
1564                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1565                          * sizemax: 1024 * 16 * 3 = 49152
1566                          */
1567                         if (isopkt[u].length > 49152) {
1568                                 ret = -EINVAL;
1569                                 goto error;
1570                         }
1571                         totlen += isopkt[u].length;
1572                 }
1573                 u *= sizeof(struct usb_iso_packet_descriptor);
1574                 uurb->buffer_length = totlen;
1575                 break;
1576
1577         default:
1578                 return -EINVAL;
1579         }
1580
1581         if (uurb->buffer_length > 0 &&
1582                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1583                                 uurb->buffer, uurb->buffer_length)) {
1584                 ret = -EFAULT;
1585                 goto error;
1586         }
1587         as = alloc_async(number_of_packets);
1588         if (!as) {
1589                 ret = -ENOMEM;
1590                 goto error;
1591         }
1592
1593         as->usbm = find_memory_area(ps, uurb);
1594         if (IS_ERR(as->usbm)) {
1595                 ret = PTR_ERR(as->usbm);
1596                 as->usbm = NULL;
1597                 goto error;
1598         }
1599
1600         /* do not use SG buffers when memory mapped segments
1601          * are in use
1602          */
1603         if (as->usbm)
1604                 num_sgs = 0;
1605
1606         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1607              num_sgs * sizeof(struct scatterlist);
1608         ret = usbfs_increase_memory_usage(u);
1609         if (ret)
1610                 goto error;
1611         as->mem_usage = u;
1612
1613         if (num_sgs) {
1614                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1615                                       GFP_KERNEL);
1616                 if (!as->urb->sg) {
1617                         ret = -ENOMEM;
1618                         goto error;
1619                 }
1620                 as->urb->num_sgs = num_sgs;
1621                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1622
1623                 totlen = uurb->buffer_length;
1624                 for (i = 0; i < as->urb->num_sgs; i++) {
1625                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1626                         buf = kmalloc(u, GFP_KERNEL);
1627                         if (!buf) {
1628                                 ret = -ENOMEM;
1629                                 goto error;
1630                         }
1631                         sg_set_buf(&as->urb->sg[i], buf, u);
1632
1633                         if (!is_in) {
1634                                 if (copy_from_user(buf, uurb->buffer, u)) {
1635                                         ret = -EFAULT;
1636                                         goto error;
1637                                 }
1638                                 uurb->buffer += u;
1639                         }
1640                         totlen -= u;
1641                 }
1642         } else if (uurb->buffer_length > 0) {
1643                 if (as->usbm) {
1644                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1645
1646                         as->urb->transfer_buffer = as->usbm->mem +
1647                                         (uurb_start - as->usbm->vm_start);
1648                 } else {
1649                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1650                                         GFP_KERNEL);
1651                         if (!as->urb->transfer_buffer) {
1652                                 ret = -ENOMEM;
1653                                 goto error;
1654                         }
1655                         if (!is_in) {
1656                                 if (copy_from_user(as->urb->transfer_buffer,
1657                                                    uurb->buffer,
1658                                                    uurb->buffer_length)) {
1659                                         ret = -EFAULT;
1660                                         goto error;
1661                                 }
1662                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1663                                 /*
1664                                  * Isochronous input data may end up being
1665                                  * discontiguous if some of the packets are
1666                                  * short. Clear the buffer so that the gaps
1667                                  * don't leak kernel data to userspace.
1668                                  */
1669                                 memset(as->urb->transfer_buffer, 0,
1670                                                 uurb->buffer_length);
1671                         }
1672                 }
1673         }
1674         as->urb->dev = ps->dev;
1675         as->urb->pipe = (uurb->type << 30) |
1676                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1677                         (uurb->endpoint & USB_DIR_IN);
1678
1679         /* This tedious sequence is necessary because the URB_* flags
1680          * are internal to the kernel and subject to change, whereas
1681          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1682          */
1683         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1684         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1685                 u |= URB_ISO_ASAP;
1686         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1687                 u |= URB_SHORT_NOT_OK;
1688         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1689                 u |= URB_NO_FSBR;
1690         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1691                 u |= URB_ZERO_PACKET;
1692         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1693                 u |= URB_NO_INTERRUPT;
1694         as->urb->transfer_flags = u;
1695
1696         as->urb->transfer_buffer_length = uurb->buffer_length;
1697         as->urb->setup_packet = (unsigned char *)dr;
1698         dr = NULL;
1699         as->urb->start_frame = uurb->start_frame;
1700         as->urb->number_of_packets = number_of_packets;
1701         as->urb->stream_id = stream_id;
1702
1703         if (ep->desc.bInterval) {
1704                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1705                                 ps->dev->speed == USB_SPEED_HIGH ||
1706                                 ps->dev->speed >= USB_SPEED_SUPER)
1707                         as->urb->interval = 1 <<
1708                                         min(15, ep->desc.bInterval - 1);
1709                 else
1710                         as->urb->interval = ep->desc.bInterval;
1711         }
1712
1713         as->urb->context = as;
1714         as->urb->complete = async_completed;
1715         for (totlen = u = 0; u < number_of_packets; u++) {
1716                 as->urb->iso_frame_desc[u].offset = totlen;
1717                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1718                 totlen += isopkt[u].length;
1719         }
1720         kfree(isopkt);
1721         isopkt = NULL;
1722         as->ps = ps;
1723         as->userurb = arg;
1724         if (as->usbm) {
1725                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1726
1727                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1728                 as->urb->transfer_dma = as->usbm->dma_handle +
1729                                 (uurb_start - as->usbm->vm_start);
1730         } else if (is_in && uurb->buffer_length > 0)
1731                 as->userbuffer = uurb->buffer;
1732         as->signr = uurb->signr;
1733         as->ifnum = ifnum;
1734         as->pid = get_pid(task_pid(current));
1735         as->cred = get_current_cred();
1736         security_task_getsecid(current, &as->secid);
1737         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1738                         as->urb->transfer_buffer_length, 0, SUBMIT,
1739                         NULL, 0);
1740         if (!is_in)
1741                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1742
1743         async_newpending(as);
1744
1745         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1746                 spin_lock_irq(&ps->lock);
1747
1748                 /* Not exactly the endpoint address; the direction bit is
1749                  * shifted to the 0x10 position so that the value will be
1750                  * between 0 and 31.
1751                  */
1752                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1753                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1754                                 >> 3);
1755
1756                 /* If this bulk URB is the start of a new transfer, re-enable
1757                  * the endpoint.  Otherwise mark it as a continuation URB.
1758                  */
1759                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1760                         as->bulk_status = AS_CONTINUATION;
1761                 else
1762                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1763
1764                 /* Don't accept continuation URBs if the endpoint is
1765                  * disabled because of an earlier error.
1766                  */
1767                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1768                         ret = -EREMOTEIO;
1769                 else
1770                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1771                 spin_unlock_irq(&ps->lock);
1772         } else {
1773                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1774         }
1775
1776         if (ret) {
1777                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1778                            "usbfs: usb_submit_urb returned %d\n", ret);
1779                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1780                                 0, ret, COMPLETE, NULL, 0);
1781                 async_removepending(as);
1782                 goto error;
1783         }
1784         return 0;
1785
1786  error:
1787         if (as && as->usbm)
1788                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1789         kfree(isopkt);
1790         kfree(dr);
1791         if (as)
1792                 free_async(as);
1793         return ret;
1794 }
1795
1796 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1797 {
1798         struct usbdevfs_urb uurb;
1799
1800         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1801                 return -EFAULT;
1802
1803         return proc_do_submiturb(ps, &uurb,
1804                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1805                         arg);
1806 }
1807
1808 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1809 {
1810         struct urb *urb;
1811         struct async *as;
1812         unsigned long flags;
1813
1814         spin_lock_irqsave(&ps->lock, flags);
1815         as = async_getpending(ps, arg);
1816         if (!as) {
1817                 spin_unlock_irqrestore(&ps->lock, flags);
1818                 return -EINVAL;
1819         }
1820
1821         urb = as->urb;
1822         usb_get_urb(urb);
1823         spin_unlock_irqrestore(&ps->lock, flags);
1824
1825         usb_kill_urb(urb);
1826         usb_put_urb(urb);
1827
1828         return 0;
1829 }
1830
1831 static int processcompl(struct async *as, void __user * __user *arg)
1832 {
1833         struct urb *urb = as->urb;
1834         struct usbdevfs_urb __user *userurb = as->userurb;
1835         void __user *addr = as->userurb;
1836         unsigned int i;
1837
1838         if (as->userbuffer && urb->actual_length) {
1839                 if (copy_urb_data_to_user(as->userbuffer, urb))
1840                         goto err_out;
1841         }
1842         if (put_user(as->status, &userurb->status))
1843                 goto err_out;
1844         if (put_user(urb->actual_length, &userurb->actual_length))
1845                 goto err_out;
1846         if (put_user(urb->error_count, &userurb->error_count))
1847                 goto err_out;
1848
1849         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1850                 for (i = 0; i < urb->number_of_packets; i++) {
1851                         if (put_user(urb->iso_frame_desc[i].actual_length,
1852                                      &userurb->iso_frame_desc[i].actual_length))
1853                                 goto err_out;
1854                         if (put_user(urb->iso_frame_desc[i].status,
1855                                      &userurb->iso_frame_desc[i].status))
1856                                 goto err_out;
1857                 }
1858         }
1859
1860         if (put_user(addr, (void __user * __user *)arg))
1861                 return -EFAULT;
1862         return 0;
1863
1864 err_out:
1865         return -EFAULT;
1866 }
1867
1868 static struct async *reap_as(struct usb_dev_state *ps)
1869 {
1870         DECLARE_WAITQUEUE(wait, current);
1871         struct async *as = NULL;
1872         struct usb_device *dev = ps->dev;
1873
1874         add_wait_queue(&ps->wait, &wait);
1875         for (;;) {
1876                 __set_current_state(TASK_INTERRUPTIBLE);
1877                 as = async_getcompleted(ps);
1878                 if (as || !connected(ps))
1879                         break;
1880                 if (signal_pending(current))
1881                         break;
1882                 usb_unlock_device(dev);
1883                 schedule();
1884                 usb_lock_device(dev);
1885         }
1886         remove_wait_queue(&ps->wait, &wait);
1887         set_current_state(TASK_RUNNING);
1888         return as;
1889 }
1890
1891 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1892 {
1893         struct async *as = reap_as(ps);
1894
1895         if (as) {
1896                 int retval;
1897
1898                 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1899                 retval = processcompl(as, (void __user * __user *)arg);
1900                 free_async(as);
1901                 return retval;
1902         }
1903         if (signal_pending(current))
1904                 return -EINTR;
1905         return -ENODEV;
1906 }
1907
1908 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1909 {
1910         int retval;
1911         struct async *as;
1912
1913         as = async_getcompleted(ps);
1914         if (as) {
1915                 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
1916                 retval = processcompl(as, (void __user * __user *)arg);
1917                 free_async(as);
1918         } else {
1919                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1920         }
1921         return retval;
1922 }
1923
1924 #ifdef CONFIG_COMPAT
1925 static int proc_control_compat(struct usb_dev_state *ps,
1926                                 struct usbdevfs_ctrltransfer32 __user *p32)
1927 {
1928         struct usbdevfs_ctrltransfer __user *p;
1929         __u32 udata;
1930         p = compat_alloc_user_space(sizeof(*p));
1931         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1932             get_user(udata, &p32->data) ||
1933             put_user(compat_ptr(udata), &p->data))
1934                 return -EFAULT;
1935         return proc_control(ps, p);
1936 }
1937
1938 static int proc_bulk_compat(struct usb_dev_state *ps,
1939                         struct usbdevfs_bulktransfer32 __user *p32)
1940 {
1941         struct usbdevfs_bulktransfer __user *p;
1942         compat_uint_t n;
1943         compat_caddr_t addr;
1944
1945         p = compat_alloc_user_space(sizeof(*p));
1946
1947         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1948             get_user(n, &p32->len) || put_user(n, &p->len) ||
1949             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1950             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1951                 return -EFAULT;
1952
1953         return proc_bulk(ps, p);
1954 }
1955 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1956 {
1957         struct usbdevfs_disconnectsignal32 ds;
1958
1959         if (copy_from_user(&ds, arg, sizeof(ds)))
1960                 return -EFAULT;
1961         ps->discsignr = ds.signr;
1962         ps->disccontext = compat_ptr(ds.context);
1963         return 0;
1964 }
1965
1966 static int get_urb32(struct usbdevfs_urb *kurb,
1967                      struct usbdevfs_urb32 __user *uurb)
1968 {
1969         __u32  uptr;
1970         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1971             __get_user(kurb->type, &uurb->type) ||
1972             __get_user(kurb->endpoint, &uurb->endpoint) ||
1973             __get_user(kurb->status, &uurb->status) ||
1974             __get_user(kurb->flags, &uurb->flags) ||
1975             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1976             __get_user(kurb->actual_length, &uurb->actual_length) ||
1977             __get_user(kurb->start_frame, &uurb->start_frame) ||
1978             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1979             __get_user(kurb->error_count, &uurb->error_count) ||
1980             __get_user(kurb->signr, &uurb->signr))
1981                 return -EFAULT;
1982
1983         if (__get_user(uptr, &uurb->buffer))
1984                 return -EFAULT;
1985         kurb->buffer = compat_ptr(uptr);
1986         if (__get_user(uptr, &uurb->usercontext))
1987                 return -EFAULT;
1988         kurb->usercontext = compat_ptr(uptr);
1989
1990         return 0;
1991 }
1992
1993 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1994 {
1995         struct usbdevfs_urb uurb;
1996
1997         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1998                 return -EFAULT;
1999
2000         return proc_do_submiturb(ps, &uurb,
2001                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2002                         arg);
2003 }
2004
2005 static int processcompl_compat(struct async *as, void __user * __user *arg)
2006 {
2007         struct urb *urb = as->urb;
2008         struct usbdevfs_urb32 __user *userurb = as->userurb;
2009         void __user *addr = as->userurb;
2010         unsigned int i;
2011
2012         if (as->userbuffer && urb->actual_length) {
2013                 if (copy_urb_data_to_user(as->userbuffer, urb))
2014                         return -EFAULT;
2015         }
2016         if (put_user(as->status, &userurb->status))
2017                 return -EFAULT;
2018         if (put_user(urb->actual_length, &userurb->actual_length))
2019                 return -EFAULT;
2020         if (put_user(urb->error_count, &userurb->error_count))
2021                 return -EFAULT;
2022
2023         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2024                 for (i = 0; i < urb->number_of_packets; i++) {
2025                         if (put_user(urb->iso_frame_desc[i].actual_length,
2026                                      &userurb->iso_frame_desc[i].actual_length))
2027                                 return -EFAULT;
2028                         if (put_user(urb->iso_frame_desc[i].status,
2029                                      &userurb->iso_frame_desc[i].status))
2030                                 return -EFAULT;
2031                 }
2032         }
2033
2034         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2035                 return -EFAULT;
2036         return 0;
2037 }
2038
2039 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2040 {
2041         struct async *as = reap_as(ps);
2042
2043         if (as) {
2044                 int retval;
2045
2046                 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2047                 retval = processcompl_compat(as, (void __user * __user *)arg);
2048                 free_async(as);
2049                 return retval;
2050         }
2051         if (signal_pending(current))
2052                 return -EINTR;
2053         return -ENODEV;
2054 }
2055
2056 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2057 {
2058         int retval;
2059         struct async *as;
2060
2061         as = async_getcompleted(ps);
2062         if (as) {
2063                 snoop(&ps->dev->dev, "reap %p\n", as->userurb);
2064                 retval = processcompl_compat(as, (void __user * __user *)arg);
2065                 free_async(as);
2066         } else {
2067                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2068         }
2069         return retval;
2070 }
2071
2072
2073 #endif
2074
2075 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2076 {
2077         struct usbdevfs_disconnectsignal ds;
2078
2079         if (copy_from_user(&ds, arg, sizeof(ds)))
2080                 return -EFAULT;
2081         ps->discsignr = ds.signr;
2082         ps->disccontext = ds.context;
2083         return 0;
2084 }
2085
2086 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2087 {
2088         unsigned int ifnum;
2089
2090         if (get_user(ifnum, (unsigned int __user *)arg))
2091                 return -EFAULT;
2092         return claimintf(ps, ifnum);
2093 }
2094
2095 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2096 {
2097         unsigned int ifnum;
2098         int ret;
2099
2100         if (get_user(ifnum, (unsigned int __user *)arg))
2101                 return -EFAULT;
2102         ret = releaseintf(ps, ifnum);
2103         if (ret < 0)
2104                 return ret;
2105         destroy_async_on_interface(ps, ifnum);
2106         return 0;
2107 }
2108
2109 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2110 {
2111         int                     size;
2112         void                    *buf = NULL;
2113         int                     retval = 0;
2114         struct usb_interface    *intf = NULL;
2115         struct usb_driver       *driver = NULL;
2116
2117         if (ps->privileges_dropped)
2118                 return -EACCES;
2119
2120         /* alloc buffer */
2121         size = _IOC_SIZE(ctl->ioctl_code);
2122         if (size > 0) {
2123                 buf = kmalloc(size, GFP_KERNEL);
2124                 if (buf == NULL)
2125                         return -ENOMEM;
2126                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2127                         if (copy_from_user(buf, ctl->data, size)) {
2128                                 kfree(buf);
2129                                 return -EFAULT;
2130                         }
2131                 } else {
2132                         memset(buf, 0, size);
2133                 }
2134         }
2135
2136         if (!connected(ps)) {
2137                 kfree(buf);
2138                 return -ENODEV;
2139         }
2140
2141         if (ps->dev->state != USB_STATE_CONFIGURED)
2142                 retval = -EHOSTUNREACH;
2143         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2144                 retval = -EINVAL;
2145         else switch (ctl->ioctl_code) {
2146
2147         /* disconnect kernel driver from interface */
2148         case USBDEVFS_DISCONNECT:
2149                 if (intf->dev.driver) {
2150                         driver = to_usb_driver(intf->dev.driver);
2151                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2152                         usb_driver_release_interface(driver, intf);
2153                 } else
2154                         retval = -ENODATA;
2155                 break;
2156
2157         /* let kernel drivers try to (re)bind to the interface */
2158         case USBDEVFS_CONNECT:
2159                 if (!intf->dev.driver)
2160                         retval = device_attach(&intf->dev);
2161                 else
2162                         retval = -EBUSY;
2163                 break;
2164
2165         /* talk directly to the interface's driver */
2166         default:
2167                 if (intf->dev.driver)
2168                         driver = to_usb_driver(intf->dev.driver);
2169                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2170                         retval = -ENOTTY;
2171                 } else {
2172                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2173                         if (retval == -ENOIOCTLCMD)
2174                                 retval = -ENOTTY;
2175                 }
2176         }
2177
2178         /* cleanup and return */
2179         if (retval >= 0
2180                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2181                         && size > 0
2182                         && copy_to_user(ctl->data, buf, size) != 0)
2183                 retval = -EFAULT;
2184
2185         kfree(buf);
2186         return retval;
2187 }
2188
2189 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2190 {
2191         struct usbdevfs_ioctl   ctrl;
2192
2193         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2194                 return -EFAULT;
2195         return proc_ioctl(ps, &ctrl);
2196 }
2197
2198 #ifdef CONFIG_COMPAT
2199 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2200 {
2201         struct usbdevfs_ioctl32 __user *uioc;
2202         struct usbdevfs_ioctl ctrl;
2203         u32 udata;
2204
2205         uioc = compat_ptr((long)arg);
2206         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2207             __get_user(ctrl.ifno, &uioc->ifno) ||
2208             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2209             __get_user(udata, &uioc->data))
2210                 return -EFAULT;
2211         ctrl.data = compat_ptr(udata);
2212
2213         return proc_ioctl(ps, &ctrl);
2214 }
2215 #endif
2216
2217 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2218 {
2219         unsigned portnum;
2220         int rc;
2221
2222         if (get_user(portnum, (unsigned __user *) arg))
2223                 return -EFAULT;
2224         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2225         if (rc == 0)
2226                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2227                         portnum, task_pid_nr(current), current->comm);
2228         return rc;
2229 }
2230
2231 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2232 {
2233         unsigned portnum;
2234
2235         if (get_user(portnum, (unsigned __user *) arg))
2236                 return -EFAULT;
2237         return usb_hub_release_port(ps->dev, portnum, ps);
2238 }
2239
2240 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2241 {
2242         __u32 caps;
2243
2244         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2245                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2246                         USBDEVFS_CAP_DROP_PRIVILEGES;
2247         if (!ps->dev->bus->no_stop_on_short)
2248                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2249         if (ps->dev->bus->sg_tablesize)
2250                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2251
2252         if (put_user(caps, (__u32 __user *)arg))
2253                 return -EFAULT;
2254
2255         return 0;
2256 }
2257
2258 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2259 {
2260         struct usbdevfs_disconnect_claim dc;
2261         struct usb_interface *intf;
2262
2263         if (copy_from_user(&dc, arg, sizeof(dc)))
2264                 return -EFAULT;
2265
2266         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2267         if (!intf)
2268                 return -EINVAL;
2269
2270         if (intf->dev.driver) {
2271                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2272
2273                 if (ps->privileges_dropped)
2274                         return -EACCES;
2275
2276                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2277                                 strncmp(dc.driver, intf->dev.driver->name,
2278                                         sizeof(dc.driver)) != 0)
2279                         return -EBUSY;
2280
2281                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2282                                 strncmp(dc.driver, intf->dev.driver->name,
2283                                         sizeof(dc.driver)) == 0)
2284                         return -EBUSY;
2285
2286                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2287                 usb_driver_release_interface(driver, intf);
2288         }
2289
2290         return claimintf(ps, dc.interface);
2291 }
2292
2293 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2294 {
2295         unsigned num_streams, num_eps;
2296         struct usb_host_endpoint **eps;
2297         struct usb_interface *intf;
2298         int r;
2299
2300         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2301                                    &eps, &intf);
2302         if (r)
2303                 return r;
2304
2305         destroy_async_on_interface(ps,
2306                                    intf->altsetting[0].desc.bInterfaceNumber);
2307
2308         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2309         kfree(eps);
2310         return r;
2311 }
2312
2313 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2314 {
2315         unsigned num_eps;
2316         struct usb_host_endpoint **eps;
2317         struct usb_interface *intf;
2318         int r;
2319
2320         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2321         if (r)
2322                 return r;
2323
2324         destroy_async_on_interface(ps,
2325                                    intf->altsetting[0].desc.bInterfaceNumber);
2326
2327         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2328         kfree(eps);
2329         return r;
2330 }
2331
2332 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2333 {
2334         u32 data;
2335
2336         if (copy_from_user(&data, arg, sizeof(data)))
2337                 return -EFAULT;
2338
2339         /* This is a one way operation. Once privileges are
2340          * dropped, you cannot regain them. You may however reissue
2341          * this ioctl to shrink the allowed interfaces mask.
2342          */
2343         ps->interface_allowed_mask &= data;
2344         ps->privileges_dropped = true;
2345
2346         return 0;
2347 }
2348
2349 /*
2350  * NOTE:  All requests here that have interface numbers as parameters
2351  * are assuming that somehow the configuration has been prevented from
2352  * changing.  But there's no mechanism to ensure that...
2353  */
2354 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2355                                 void __user *p)
2356 {
2357         struct usb_dev_state *ps = file->private_data;
2358         struct inode *inode = file_inode(file);
2359         struct usb_device *dev = ps->dev;
2360         int ret = -ENOTTY;
2361
2362         if (!(file->f_mode & FMODE_WRITE))
2363                 return -EPERM;
2364
2365         usb_lock_device(dev);
2366
2367         /* Reap operations are allowed even after disconnection */
2368         switch (cmd) {
2369         case USBDEVFS_REAPURB:
2370                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2371                 ret = proc_reapurb(ps, p);
2372                 goto done;
2373
2374         case USBDEVFS_REAPURBNDELAY:
2375                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2376                 ret = proc_reapurbnonblock(ps, p);
2377                 goto done;
2378
2379 #ifdef CONFIG_COMPAT
2380         case USBDEVFS_REAPURB32:
2381                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2382                 ret = proc_reapurb_compat(ps, p);
2383                 goto done;
2384
2385         case USBDEVFS_REAPURBNDELAY32:
2386                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2387                 ret = proc_reapurbnonblock_compat(ps, p);
2388                 goto done;
2389 #endif
2390         }
2391
2392         if (!connected(ps)) {
2393                 usb_unlock_device(dev);
2394                 return -ENODEV;
2395         }
2396
2397         switch (cmd) {
2398         case USBDEVFS_CONTROL:
2399                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2400                 ret = proc_control(ps, p);
2401                 if (ret >= 0)
2402                         inode->i_mtime = current_time(inode);
2403                 break;
2404
2405         case USBDEVFS_BULK:
2406                 snoop(&dev->dev, "%s: BULK\n", __func__);
2407                 ret = proc_bulk(ps, p);
2408                 if (ret >= 0)
2409                         inode->i_mtime = current_time(inode);
2410                 break;
2411
2412         case USBDEVFS_RESETEP:
2413                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2414                 ret = proc_resetep(ps, p);
2415                 if (ret >= 0)
2416                         inode->i_mtime = current_time(inode);
2417                 break;
2418
2419         case USBDEVFS_RESET:
2420                 snoop(&dev->dev, "%s: RESET\n", __func__);
2421                 ret = proc_resetdevice(ps);
2422                 break;
2423
2424         case USBDEVFS_CLEAR_HALT:
2425                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2426                 ret = proc_clearhalt(ps, p);
2427                 if (ret >= 0)
2428                         inode->i_mtime = current_time(inode);
2429                 break;
2430
2431         case USBDEVFS_GETDRIVER:
2432                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2433                 ret = proc_getdriver(ps, p);
2434                 break;
2435
2436         case USBDEVFS_CONNECTINFO:
2437                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2438                 ret = proc_connectinfo(ps, p);
2439                 break;
2440
2441         case USBDEVFS_SETINTERFACE:
2442                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2443                 ret = proc_setintf(ps, p);
2444                 break;
2445
2446         case USBDEVFS_SETCONFIGURATION:
2447                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2448                 ret = proc_setconfig(ps, p);
2449                 break;
2450
2451         case USBDEVFS_SUBMITURB:
2452                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2453                 ret = proc_submiturb(ps, p);
2454                 if (ret >= 0)
2455                         inode->i_mtime = current_time(inode);
2456                 break;
2457
2458 #ifdef CONFIG_COMPAT
2459         case USBDEVFS_CONTROL32:
2460                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2461                 ret = proc_control_compat(ps, p);
2462                 if (ret >= 0)
2463                         inode->i_mtime = current_time(inode);
2464                 break;
2465
2466         case USBDEVFS_BULK32:
2467                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2468                 ret = proc_bulk_compat(ps, p);
2469                 if (ret >= 0)
2470                         inode->i_mtime = current_time(inode);
2471                 break;
2472
2473         case USBDEVFS_DISCSIGNAL32:
2474                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2475                 ret = proc_disconnectsignal_compat(ps, p);
2476                 break;
2477
2478         case USBDEVFS_SUBMITURB32:
2479                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2480                 ret = proc_submiturb_compat(ps, p);
2481                 if (ret >= 0)
2482                         inode->i_mtime = current_time(inode);
2483                 break;
2484
2485         case USBDEVFS_IOCTL32:
2486                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2487                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2488                 break;
2489 #endif
2490
2491         case USBDEVFS_DISCARDURB:
2492                 snoop(&dev->dev, "%s: DISCARDURB %p\n", __func__, p);
2493                 ret = proc_unlinkurb(ps, p);
2494                 break;
2495
2496         case USBDEVFS_DISCSIGNAL:
2497                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2498                 ret = proc_disconnectsignal(ps, p);
2499                 break;
2500
2501         case USBDEVFS_CLAIMINTERFACE:
2502                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2503                 ret = proc_claiminterface(ps, p);
2504                 break;
2505
2506         case USBDEVFS_RELEASEINTERFACE:
2507                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2508                 ret = proc_releaseinterface(ps, p);
2509                 break;
2510
2511         case USBDEVFS_IOCTL:
2512                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2513                 ret = proc_ioctl_default(ps, p);
2514                 break;
2515
2516         case USBDEVFS_CLAIM_PORT:
2517                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2518                 ret = proc_claim_port(ps, p);
2519                 break;
2520
2521         case USBDEVFS_RELEASE_PORT:
2522                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2523                 ret = proc_release_port(ps, p);
2524                 break;
2525         case USBDEVFS_GET_CAPABILITIES:
2526                 ret = proc_get_capabilities(ps, p);
2527                 break;
2528         case USBDEVFS_DISCONNECT_CLAIM:
2529                 ret = proc_disconnect_claim(ps, p);
2530                 break;
2531         case USBDEVFS_ALLOC_STREAMS:
2532                 ret = proc_alloc_streams(ps, p);
2533                 break;
2534         case USBDEVFS_FREE_STREAMS:
2535                 ret = proc_free_streams(ps, p);
2536                 break;
2537         case USBDEVFS_DROP_PRIVILEGES:
2538                 ret = proc_drop_privileges(ps, p);
2539                 break;
2540         }
2541
2542  done:
2543         usb_unlock_device(dev);
2544         if (ret >= 0)
2545                 inode->i_atime = current_time(inode);
2546         return ret;
2547 }
2548
2549 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2550                         unsigned long arg)
2551 {
2552         int ret;
2553
2554         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2555
2556         return ret;
2557 }
2558
2559 #ifdef CONFIG_COMPAT
2560 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2561                         unsigned long arg)
2562 {
2563         int ret;
2564
2565         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2566
2567         return ret;
2568 }
2569 #endif
2570
2571 /* No kernel lock - fine */
2572 static unsigned int usbdev_poll(struct file *file,
2573                                 struct poll_table_struct *wait)
2574 {
2575         struct usb_dev_state *ps = file->private_data;
2576         unsigned int mask = 0;
2577
2578         poll_wait(file, &ps->wait, wait);
2579         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2580                 mask |= POLLOUT | POLLWRNORM;
2581         if (!connected(ps))
2582                 mask |= POLLHUP;
2583         if (list_empty(&ps->list))
2584                 mask |= POLLERR;
2585         return mask;
2586 }
2587
2588 const struct file_operations usbdev_file_operations = {
2589         .owner =          THIS_MODULE,
2590         .llseek =         no_seek_end_llseek,
2591         .read =           usbdev_read,
2592         .poll =           usbdev_poll,
2593         .unlocked_ioctl = usbdev_ioctl,
2594 #ifdef CONFIG_COMPAT
2595         .compat_ioctl =   usbdev_compat_ioctl,
2596 #endif
2597         .mmap =           usbdev_mmap,
2598         .open =           usbdev_open,
2599         .release =        usbdev_release,
2600 };
2601
2602 static void usbdev_remove(struct usb_device *udev)
2603 {
2604         struct usb_dev_state *ps;
2605         struct siginfo sinfo;
2606
2607         while (!list_empty(&udev->filelist)) {
2608                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2609                 destroy_all_async(ps);
2610                 wake_up_all(&ps->wait);
2611                 list_del_init(&ps->list);
2612                 if (ps->discsignr) {
2613                         memset(&sinfo, 0, sizeof(sinfo));
2614                         sinfo.si_signo = ps->discsignr;
2615                         sinfo.si_errno = EPIPE;
2616                         sinfo.si_code = SI_ASYNCIO;
2617                         sinfo.si_addr = ps->disccontext;
2618                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2619                                         ps->disc_pid, ps->cred, ps->secid);
2620                 }
2621         }
2622 }
2623
2624 static int usbdev_notify(struct notifier_block *self,
2625                                unsigned long action, void *dev)
2626 {
2627         switch (action) {
2628         case USB_DEVICE_ADD:
2629                 break;
2630         case USB_DEVICE_REMOVE:
2631                 usbdev_remove(dev);
2632                 break;
2633         }
2634         return NOTIFY_OK;
2635 }
2636
2637 static struct notifier_block usbdev_nb = {
2638         .notifier_call =        usbdev_notify,
2639 };
2640
2641 static struct cdev usb_device_cdev;
2642
2643 int __init usb_devio_init(void)
2644 {
2645         int retval;
2646
2647         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2648                                         "usb_device");
2649         if (retval) {
2650                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2651                 goto out;
2652         }
2653         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2654         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2655         if (retval) {
2656                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2657                        USB_DEVICE_MAJOR);
2658                 goto error_cdev;
2659         }
2660         usb_register_notify(&usbdev_nb);
2661 out:
2662         return retval;
2663
2664 error_cdev:
2665         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2666         goto out;
2667 }
2668
2669 void usb_devio_cleanup(void)
2670 {
2671         usb_unregister_notify(&usbdev_nb);
2672         cdev_del(&usb_device_cdev);
2673         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2674 }