drivers/usb/storage/uas.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * USB Attached SCSI
   4  * Note that this is not the same as the USB Mass Storage driver
   5  *
   6  * Copyright Hans de Goede <[email protected]> for Red Hat, Inc. 2013 - 2016
   7  * Copyright Matthew Wilcox for Intel Corp, 2010
   8  * Copyright Sarah Sharp for Intel Corp, 2010
   9  */
  10
  11 #include <linux/blkdev.h>
  12 #include <linux/slab.h>
  13 #include <linux/types.h>
  14 #include <linux/module.h>
  15 #include <linux/usb.h>
  16 #include <linux/usb_usual.h>
  17 #include <linux/usb/hcd.h>
  18 #include <linux/usb/storage.h>
  19 #include <linux/usb/uas.h>
  20
  21 #include <scsi/scsi.h>
  22 #include <scsi/scsi_eh.h>
  23 #include <scsi/scsi_dbg.h>
  24 #include <scsi/scsi_cmnd.h>
  25 #include <scsi/scsi_device.h>
  26 #include <scsi/scsi_host.h>
  27 #include <scsi/scsi_tcq.h>
  28
  29 #include "uas-detect.h"
  30 #include "scsiglue.h"
  31
  32 #define MAX_CMNDS 256
  33
  34 struct uas_dev_info {
  35         struct usb_interface *intf;
  36         struct usb_device *udev;
  37         struct usb_anchor cmd_urbs;
  38         struct usb_anchor sense_urbs;
  39         struct usb_anchor data_urbs;
  40         unsigned long flags;
  41         int qdepth, resetting;
  42         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
  43         unsigned use_streams:1;
  44         unsigned shutdown:1;
  45         struct scsi_cmnd *cmnd[MAX_CMNDS];
  46         spinlock_t lock;
  47         struct work_struct work;
  48         struct work_struct scan_work;      /* for async scanning */
  49 };
  50
  51 enum {
  52         SUBMIT_STATUS_URB       = BIT(1),
  53         ALLOC_DATA_IN_URB       = BIT(2),
  54         SUBMIT_DATA_IN_URB      = BIT(3),
  55         ALLOC_DATA_OUT_URB      = BIT(4),
  56         SUBMIT_DATA_OUT_URB     = BIT(5),
  57         ALLOC_CMD_URB           = BIT(6),
  58         SUBMIT_CMD_URB          = BIT(7),
  59         COMMAND_INFLIGHT        = BIT(8),
  60         DATA_IN_URB_INFLIGHT    = BIT(9),
  61         DATA_OUT_URB_INFLIGHT   = BIT(10),
  62         COMMAND_ABORTED         = BIT(11),
  63         IS_IN_WORK_LIST         = BIT(12),
  64 };
  65
  66 /* Overrides scsi_pointer */
  67 struct uas_cmd_info {
  68         unsigned int state;
  69         unsigned int uas_tag;
  70         struct urb *cmd_urb;
  71         struct urb *data_in_urb;
  72         struct urb *data_out_urb;
  73 };
  74
  75 /* I hate forward declarations, but I actually have a loop */
  76 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
  77                                 struct uas_dev_info *devinfo);
  78 static void uas_do_work(struct work_struct *work);
  79 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
  80 static void uas_free_streams(struct uas_dev_info *devinfo);
  81 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
  82                                 int status);
  83
  84 /*
  85  * This driver needs its own workqueue, as we need to control memory allocation.
  86  *
  87  * In the course of error handling and power management uas_wait_for_pending_cmnds()
  88  * needs to flush pending work items. In these contexts we cannot allocate memory
  89  * by doing block IO as we would deadlock. For the same reason we cannot wait
  90  * for anything allocating memory not heeding these constraints.
  91  *
  92  * So we have to control all work items that can be on the workqueue we flush.
  93  * Hence we cannot share a queue and need our own.
  94  */
  95 static struct workqueue_struct *workqueue;
  96
  97 static void uas_do_work(struct work_struct *work)
  98 {
  99         struct uas_dev_info *devinfo =
 100                 container_of(work, struct uas_dev_info, work);
 101         struct uas_cmd_info *cmdinfo;
 102         struct scsi_cmnd *cmnd;
 103         unsigned long flags;
 104         int i, err;
 105
 106         spin_lock_irqsave(&devinfo->lock, flags);
 107
 108         if (devinfo->resetting)
 109                 goto out;
 110
 111         for (i = 0; i < devinfo->qdepth; i++) {
 112                 if (!devinfo->cmnd[i])
 113                         continue;
 114
 115                 cmnd = devinfo->cmnd[i];
 116                 cmdinfo = (void *)&cmnd->SCp;
 117
 118                 if (!(cmdinfo->state & IS_IN_WORK_LIST))
 119                         continue;
 120
 121                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
 122                 if (!err)
 123                         cmdinfo->state &= ~IS_IN_WORK_LIST;
 124                 else
 125                         queue_work(workqueue, &devinfo->work);
 126         }
 127 out:
 128         spin_unlock_irqrestore(&devinfo->lock, flags);
 129 }
 130
 131 static void uas_scan_work(struct work_struct *work)
 132 {
 133         struct uas_dev_info *devinfo =
 134                 container_of(work, struct uas_dev_info, scan_work);
 135         struct Scsi_Host *shost = usb_get_intfdata(devinfo->intf);
 136
 137         dev_dbg(&devinfo->intf->dev, "starting scan\n");
 138         scsi_scan_host(shost);
 139         dev_dbg(&devinfo->intf->dev, "scan complete\n");
 140 }
 141
 142 static void uas_add_work(struct uas_cmd_info *cmdinfo)
 143 {
 144         struct scsi_pointer *scp = (void *)cmdinfo;
 145         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 146         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 147
 148         lockdep_assert_held(&devinfo->lock);
 149         cmdinfo->state |= IS_IN_WORK_LIST;
 150         queue_work(workqueue, &devinfo->work);
 151 }
 152
 153 static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
 154 {
 155         struct uas_cmd_info *cmdinfo;
 156         struct scsi_cmnd *cmnd;
 157         unsigned long flags;
 158         int i, err;
 159
 160         spin_lock_irqsave(&devinfo->lock, flags);
 161         for (i = 0; i < devinfo->qdepth; i++) {
 162                 if (!devinfo->cmnd[i])
 163                         continue;
 164
 165                 cmnd = devinfo->cmnd[i];
 166                 cmdinfo = (void *)&cmnd->SCp;
 167                 uas_log_cmd_state(cmnd, __func__, 0);
 168                 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
 169                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 170                 cmnd->result = result << 16;
 171                 err = uas_try_complete(cmnd, __func__);
 172                 WARN_ON(err != 0);
 173         }
 174         spin_unlock_irqrestore(&devinfo->lock, flags);
 175 }
 176
 177 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
 178 {
 179         struct sense_iu *sense_iu = urb->transfer_buffer;
 180         struct scsi_device *sdev = cmnd->device;
 181
 182         if (urb->actual_length > 16) {
 183                 unsigned len = be16_to_cpup(&sense_iu->len);
 184                 if (len + 16 != urb->actual_length) {
 185                         int newlen = min(len + 16, urb->actual_length) - 16;
 186                         if (newlen < 0)
 187                                 newlen = 0;
 188                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 189                                 "disagrees with IU sense data length %d, "
 190                                 "using %d bytes of sense data\n", __func__,
 191                                         urb->actual_length, len, newlen);
 192                         len = newlen;
 193                 }
 194                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 195         }
 196
 197         cmnd->result = sense_iu->status;
 198 }
 199
 200 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
 201                               int status)
 202 {
 203         struct uas_cmd_info *ci = (void *)&cmnd->SCp;
 204         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 205
 206         if (status == -ENODEV) /* too late */
 207                 return;
 208
 209         scmd_printk(KERN_INFO, cmnd,
 210                     "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
 211                     prefix, status, cmdinfo->uas_tag,
 212                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
 213                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
 214                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
 215                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
 216                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
 217                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
 218                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
 219                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
 220                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
 221                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
 222                     (ci->state & COMMAND_ABORTED)       ? " abort" : "",
 223                     (ci->state & IS_IN_WORK_LIST)       ? " work"  : "");
 224         scsi_print_command(cmnd);
 225 }
 226
 227 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
 228 {
 229         struct uas_cmd_info *cmdinfo;
 230
 231         if (!cmnd)
 232                 return;
 233
 234         cmdinfo = (void *)&cmnd->SCp;
 235
 236         if (cmdinfo->state & SUBMIT_CMD_URB)
 237                 usb_free_urb(cmdinfo->cmd_urb);
 238
 239         /* data urbs may have never gotten their submit flag set */
 240         if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
 241                 usb_free_urb(cmdinfo->data_in_urb);
 242         if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
 243                 usb_free_urb(cmdinfo->data_out_urb);
 244 }
 245
 246 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 247 {
 248         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 249         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 250
 251         lockdep_assert_held(&devinfo->lock);
 252         if (cmdinfo->state & (COMMAND_INFLIGHT |
 253                               DATA_IN_URB_INFLIGHT |
 254                               DATA_OUT_URB_INFLIGHT |
 255                               COMMAND_ABORTED))
 256                 return -EBUSY;
 257         devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
 258         uas_free_unsubmitted_urbs(cmnd);
 259         scsi_done(cmnd);
 260         return 0;
 261 }
 262
 263 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
 264                           unsigned direction)
 265 {
 266         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 267         int err;
 268
 269         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
 270         err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
 271         if (err) {
 272                 uas_add_work(cmdinfo);
 273         }
 274 }
 275
 276 static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
 277 {
 278         u8 response_code = riu->response_code;
 279
 280         switch (response_code) {
 281         case RC_INCORRECT_LUN:
 282                 set_host_byte(cmnd, DID_BAD_TARGET);
 283                 break;
 284         case RC_TMF_SUCCEEDED:
 285                 set_host_byte(cmnd, DID_OK);
 286                 break;
 287         case RC_TMF_NOT_SUPPORTED:
 288                 set_host_byte(cmnd, DID_TARGET_FAILURE);
 289                 break;
 290         default:
 291                 uas_log_cmd_state(cmnd, "response iu", response_code);
 292                 set_host_byte(cmnd, DID_ERROR);
 293                 break;
 294         }
 295
 296         return response_code == RC_TMF_SUCCEEDED;
 297 }
 298
 299 static void uas_stat_cmplt(struct urb *urb)
 300 {
 301         struct iu *iu = urb->transfer_buffer;
 302         struct Scsi_Host *shost = urb->context;
 303         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 304         struct urb *data_in_urb = NULL;
 305         struct urb *data_out_urb = NULL;
 306         struct scsi_cmnd *cmnd;
 307         struct uas_cmd_info *cmdinfo;
 308         unsigned long flags;
 309         unsigned int idx;
 310         int status = urb->status;
 311         bool success;
 312
 313         spin_lock_irqsave(&devinfo->lock, flags);
 314
 315         if (devinfo->resetting)
 316                 goto out;
 317
 318         if (status) {
 319                 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
 320                         dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
 321                 goto out;
 322         }
 323
 324         idx = be16_to_cpup(&iu->tag) - 1;
 325         if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
 326                 dev_err(&urb->dev->dev,
 327                         "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
 328                 goto out;
 329         }
 330
 331         cmnd = devinfo->cmnd[idx];
 332         cmdinfo = (void *)&cmnd->SCp;
 333
 334         if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
 335                 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
 336                 goto out;
 337         }
 338
 339         switch (iu->iu_id) {
 340         case IU_ID_STATUS:
 341                 uas_sense(urb, cmnd);
 342                 if (cmnd->result != 0) {
 343                         /* cancel data transfers on error */
 344                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 345                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 346                 }
 347                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 348                 uas_try_complete(cmnd, __func__);
 349                 break;
 350         case IU_ID_READ_READY:
 351                 if (!cmdinfo->data_in_urb ||
 352                                 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
 353                         uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
 354                         break;
 355                 }
 356                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
 357                 break;
 358         case IU_ID_WRITE_READY:
 359                 if (!cmdinfo->data_out_urb ||
 360                                 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
 361                         uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
 362                         break;
 363                 }
 364                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
 365                 break;
 366         case IU_ID_RESPONSE:
 367                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 368                 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
 369                 if (!success) {
 370                         /* Error, cancel data transfers */
 371                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 372                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 373                 }
 374                 uas_try_complete(cmnd, __func__);
 375                 break;
 376         default:
 377                 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
 378         }
 379 out:
 380         usb_free_urb(urb);
 381         spin_unlock_irqrestore(&devinfo->lock, flags);
 382
 383         /* Unlinking of data urbs must be done without holding the lock */
 384         if (data_in_urb) {
 385                 usb_unlink_urb(data_in_urb);
 386                 usb_put_urb(data_in_urb);
 387         }
 388         if (data_out_urb) {
 389                 usb_unlink_urb(data_out_urb);
 390                 usb_put_urb(data_out_urb);
 391         }
 392 }
 393
 394 static void uas_data_cmplt(struct urb *urb)
 395 {
 396         struct scsi_cmnd *cmnd = urb->context;
 397         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 398         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 399         struct scsi_data_buffer *sdb = &cmnd->sdb;
 400         unsigned long flags;
 401         int status = urb->status;
 402
 403         spin_lock_irqsave(&devinfo->lock, flags);
 404
 405         if (cmdinfo->data_in_urb == urb) {
 406                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
 407                 cmdinfo->data_in_urb = NULL;
 408         } else if (cmdinfo->data_out_urb == urb) {
 409                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
 410                 cmdinfo->data_out_urb = NULL;
 411         }
 412
 413         if (devinfo->resetting)
 414                 goto out;
 415
 416         /* Data urbs should not complete before the cmd urb is submitted */
 417         if (cmdinfo->state & SUBMIT_CMD_URB) {
 418                 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
 419                 goto out;
 420         }
 421
 422         if (status) {
 423                 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
 424                         uas_log_cmd_state(cmnd, "data cmplt err", status);
 425                 /* error: no data transfered */
 426                 scsi_set_resid(cmnd, sdb->length);
 427         } else {
 428                 scsi_set_resid(cmnd, sdb->length - urb->actual_length);
 429         }
 430         uas_try_complete(cmnd, __func__);
 431 out:
 432         usb_free_urb(urb);
 433         spin_unlock_irqrestore(&devinfo->lock, flags);
 434 }
 435
 436 static void uas_cmd_cmplt(struct urb *urb)
 437 {
 438         if (urb->status)
 439                 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
 440
 441         usb_free_urb(urb);
 442 }
 443
 444 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 445                                       struct scsi_cmnd *cmnd,
 446                                       enum dma_data_direction dir)
 447 {
 448         struct usb_device *udev = devinfo->udev;
 449         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 450         struct urb *urb = usb_alloc_urb(0, gfp);
 451         struct scsi_data_buffer *sdb = &cmnd->sdb;
 452         unsigned int pipe = (dir == DMA_FROM_DEVICE)
 453                 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
 454
 455         if (!urb)
 456                 goto out;
 457         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
 458                           uas_data_cmplt, cmnd);
 459         if (devinfo->use_streams)
 460                 urb->stream_id = cmdinfo->uas_tag;
 461         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
 462         urb->sg = sdb->table.sgl;
 463  out:
 464         return urb;
 465 }
 466
 467 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 468                                        struct scsi_cmnd *cmnd)
 469 {
 470         struct usb_device *udev = devinfo->udev;
 471         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 472         struct urb *urb = usb_alloc_urb(0, gfp);
 473         struct sense_iu *iu;
 474
 475         if (!urb)
 476                 goto out;
 477
 478         iu = kzalloc(sizeof(*iu), gfp);
 479         if (!iu)
 480                 goto free;
 481
 482         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
 483                           uas_stat_cmplt, cmnd->device->host);
 484         if (devinfo->use_streams)
 485                 urb->stream_id = cmdinfo->uas_tag;
 486         urb->transfer_flags |= URB_FREE_BUFFER;
 487  out:
 488         return urb;
 489  free:
 490         usb_free_urb(urb);
 491         return NULL;
 492 }
 493
 494 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 495                                         struct scsi_cmnd *cmnd)
 496 {
 497         struct usb_device *udev = devinfo->udev;
 498         struct scsi_device *sdev = cmnd->device;
 499         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 500         struct urb *urb = usb_alloc_urb(0, gfp);
 501         struct command_iu *iu;
 502         int len;
 503
 504         if (!urb)
 505                 goto out;
 506
 507         len = cmnd->cmd_len - 16;
 508         if (len < 0)
 509                 len = 0;
 510         len = ALIGN(len, 4);
 511         iu = kzalloc(sizeof(*iu) + len, gfp);
 512         if (!iu)
 513                 goto free;
 514
 515         iu->iu_id = IU_ID_COMMAND;
 516         iu->tag = cpu_to_be16(cmdinfo->uas_tag);
 517         iu->prio_attr = UAS_SIMPLE_TAG;
 518         iu->len = len;
 519         int_to_scsilun(sdev->lun, &iu->lun);
 520         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 521
 522         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
 523                                                         uas_cmd_cmplt, NULL);
 524         urb->transfer_flags |= URB_FREE_BUFFER;
 525  out:
 526         return urb;
 527  free:
 528         usb_free_urb(urb);
 529         return NULL;
 530 }
 531
 532 /*
 533  * Why should I request the Status IU before sending the Command IU?  Spec
 534  * says to, but also says the device may receive them in any order.  Seems
 535  * daft to me.
 536  */
 537
 538 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
 539 {
 540         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 541         struct urb *urb;
 542         int err;
 543
 544         urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
 545         if (!urb)
 546                 return NULL;
 547         usb_anchor_urb(urb, &devinfo->sense_urbs);
 548         err = usb_submit_urb(urb, gfp);
 549         if (err) {
 550                 usb_unanchor_urb(urb);
 551                 uas_log_cmd_state(cmnd, "sense submit err", err);
 552                 usb_free_urb(urb);
 553                 return NULL;
 554         }
 555         return urb;
 556 }
 557
 558 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 559                            struct uas_dev_info *devinfo)
 560 {
 561         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 562         struct urb *urb;
 563         int err;
 564
 565         lockdep_assert_held(&devinfo->lock);
 566         if (cmdinfo->state & SUBMIT_STATUS_URB) {
 567                 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
 568                 if (!urb)
 569                         return SCSI_MLQUEUE_DEVICE_BUSY;
 570                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
 571         }
 572
 573         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
 574                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
 575                                                         cmnd, DMA_FROM_DEVICE);
 576                 if (!cmdinfo->data_in_urb)
 577                         return SCSI_MLQUEUE_DEVICE_BUSY;
 578                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
 579         }
 580
 581         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
 582                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 583                 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
 584                 if (err) {
 585                         usb_unanchor_urb(cmdinfo->data_in_urb);
 586                         uas_log_cmd_state(cmnd, "data in submit err", err);
 587                         return SCSI_MLQUEUE_DEVICE_BUSY;
 588                 }
 589                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 590                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
 591         }
 592
 593         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
 594                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
 595                                                         cmnd, DMA_TO_DEVICE);
 596                 if (!cmdinfo->data_out_urb)
 597                         return SCSI_MLQUEUE_DEVICE_BUSY;
 598                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
 599         }
 600
 601         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
 602                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 603                 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
 604                 if (err) {
 605                         usb_unanchor_urb(cmdinfo->data_out_urb);
 606                         uas_log_cmd_state(cmnd, "data out submit err", err);
 607                         return SCSI_MLQUEUE_DEVICE_BUSY;
 608                 }
 609                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 610                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
 611         }
 612
 613         if (cmdinfo->state & ALLOC_CMD_URB) {
 614                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
 615                 if (!cmdinfo->cmd_urb)
 616                         return SCSI_MLQUEUE_DEVICE_BUSY;
 617                 cmdinfo->state &= ~ALLOC_CMD_URB;
 618         }
 619
 620         if (cmdinfo->state & SUBMIT_CMD_URB) {
 621                 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
 622                 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
 623                 if (err) {
 624                         usb_unanchor_urb(cmdinfo->cmd_urb);
 625                         uas_log_cmd_state(cmnd, "cmd submit err", err);
 626                         return SCSI_MLQUEUE_DEVICE_BUSY;
 627                 }
 628                 cmdinfo->cmd_urb = NULL;
 629                 cmdinfo->state &= ~SUBMIT_CMD_URB;
 630                 cmdinfo->state |= COMMAND_INFLIGHT;
 631         }
 632
 633         return 0;
 634 }
 635
 636 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd)
 637 {
 638         struct scsi_device *sdev = cmnd->device;
 639         struct uas_dev_info *devinfo = sdev->hostdata;
 640         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 641         unsigned long flags;
 642         int idx, err;
 643
 644         BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
 645
 646         /* Re-check scsi_block_requests now that we've the host-lock */
 647         if (cmnd->device->host->host_self_blocked)
 648                 return SCSI_MLQUEUE_DEVICE_BUSY;
 649
 650         if ((devinfo->flags & US_FL_NO_ATA_1X) &&
 651                         (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
 652                 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
 653                        sizeof(usb_stor_sense_invalidCDB));
 654                 cmnd->result = SAM_STAT_CHECK_CONDITION;
 655                 scsi_done(cmnd);
 656                 return 0;
 657         }
 658
 659         spin_lock_irqsave(&devinfo->lock, flags);
 660
 661         if (devinfo->resetting) {
 662                 set_host_byte(cmnd, DID_ERROR);
 663                 scsi_done(cmnd);
 664                 goto zombie;
 665         }
 666
 667         /* Find a free uas-tag */
 668         for (idx = 0; idx < devinfo->qdepth; idx++) {
 669                 if (!devinfo->cmnd[idx])
 670                         break;
 671         }
 672         if (idx == devinfo->qdepth) {
 673                 spin_unlock_irqrestore(&devinfo->lock, flags);
 674                 return SCSI_MLQUEUE_DEVICE_BUSY;
 675         }
 676
 677         memset(cmdinfo, 0, sizeof(*cmdinfo));
 678         cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
 679         cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
 680
 681         switch (cmnd->sc_data_direction) {
 682         case DMA_FROM_DEVICE:
 683                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 684                 break;
 685         case DMA_BIDIRECTIONAL:
 686                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 687                 fallthrough;
 688         case DMA_TO_DEVICE:
 689                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
 690                 break;
 691         case DMA_NONE:
 692                 break;
 693         }
 694
 695         if (!devinfo->use_streams)
 696                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
 697
 698         err = uas_submit_urbs(cmnd, devinfo);
 699         /*
 700          * in case of fatal errors the SCSI layer is peculiar
 701          * a command that has finished is a success for the purpose
 702          * of queueing, no matter how fatal the error
 703          */
 704         if (err == -ENODEV) {
 705                 set_host_byte(cmnd, DID_ERROR);
 706                 scsi_done(cmnd);
 707                 goto zombie;
 708         }
 709         if (err) {
 710                 /* If we did nothing, give up now */
 711                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
 712                         spin_unlock_irqrestore(&devinfo->lock, flags);
 713                         return SCSI_MLQUEUE_DEVICE_BUSY;
 714                 }
 715                 uas_add_work(cmdinfo);
 716         }
 717
 718         devinfo->cmnd[idx] = cmnd;
 719 zombie:
 720         spin_unlock_irqrestore(&devinfo->lock, flags);
 721         return 0;
 722 }
 723
 724 static DEF_SCSI_QCMD(uas_queuecommand)
 725
 726 /*
 727  * For now we do not support actually sending an abort to the device, so
 728  * this eh always fails. Still we must define it to make sure that we've
 729  * dropped all references to the cmnd in question once this function exits.
 730  */
 731 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
 732 {
 733         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 734         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 735         struct urb *data_in_urb = NULL;
 736         struct urb *data_out_urb = NULL;
 737         unsigned long flags;
 738
 739         spin_lock_irqsave(&devinfo->lock, flags);
 740
 741         uas_log_cmd_state(cmnd, __func__, 0);
 742
 743         /* Ensure that try_complete does not call scsi_done */
 744         cmdinfo->state |= COMMAND_ABORTED;
 745
 746         /* Drop all refs to this cmnd, kill data urbs to break their ref */
 747         devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
 748         if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
 749                 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 750         if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
 751                 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 752
 753         uas_free_unsubmitted_urbs(cmnd);
 754
 755         spin_unlock_irqrestore(&devinfo->lock, flags);
 756
 757         if (data_in_urb) {
 758                 usb_kill_urb(data_in_urb);
 759                 usb_put_urb(data_in_urb);
 760         }
 761         if (data_out_urb) {
 762                 usb_kill_urb(data_out_urb);
 763                 usb_put_urb(data_out_urb);
 764         }
 765
 766         return FAILED;
 767 }
 768
 769 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
 770 {
 771         struct scsi_device *sdev = cmnd->device;
 772         struct uas_dev_info *devinfo = sdev->hostdata;
 773         struct usb_device *udev = devinfo->udev;
 774         unsigned long flags;
 775         int err;
 776
 777         err = usb_lock_device_for_reset(udev, devinfo->intf);
 778         if (err) {
 779                 shost_printk(KERN_ERR, sdev->host,
 780                              "%s FAILED to get lock err %d\n", __func__, err);
 781                 return FAILED;
 782         }
 783
 784         shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
 785
 786         spin_lock_irqsave(&devinfo->lock, flags);
 787         devinfo->resetting = 1;
 788         spin_unlock_irqrestore(&devinfo->lock, flags);
 789
 790         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
 791         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 792         usb_kill_anchored_urbs(&devinfo->data_urbs);
 793         uas_zap_pending(devinfo, DID_RESET);
 794
 795         err = usb_reset_device(udev);
 796
 797         spin_lock_irqsave(&devinfo->lock, flags);
 798         devinfo->resetting = 0;
 799         spin_unlock_irqrestore(&devinfo->lock, flags);
 800
 801         usb_unlock_device(udev);
 802
 803         if (err) {
 804                 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
 805                              __func__, err);
 806                 return FAILED;
 807         }
 808
 809         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
 810         return SUCCESS;
 811 }
 812
 813 static int uas_target_alloc(struct scsi_target *starget)
 814 {
 815         struct uas_dev_info *devinfo = (struct uas_dev_info *)
 816                         dev_to_shost(starget->dev.parent)->hostdata;
 817
 818         if (devinfo->flags & US_FL_NO_REPORT_LUNS)
 819                 starget->no_report_luns = 1;
 820
 821         return 0;
 822 }
 823
 824 static int uas_slave_alloc(struct scsi_device *sdev)
 825 {
 826         struct uas_dev_info *devinfo =
 827                 (struct uas_dev_info *)sdev->host->hostdata;
 828
 829         sdev->hostdata = devinfo;
 830
 831         /*
 832          * The protocol has no requirements on alignment in the strict sense.
 833          * Controllers may or may not have alignment restrictions.
 834          * As this is not exported, we use an extremely conservative guess.
 835          */
 836         blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
 837
 838         if (devinfo->flags & US_FL_MAX_SECTORS_64)
 839                 blk_queue_max_hw_sectors(sdev->request_queue, 64);
 840         else if (devinfo->flags & US_FL_MAX_SECTORS_240)
 841                 blk_queue_max_hw_sectors(sdev->request_queue, 240);
 842
 843         return 0;
 844 }
 845
 846 static int uas_slave_configure(struct scsi_device *sdev)
 847 {
 848         struct uas_dev_info *devinfo = sdev->hostdata;
 849
 850         if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
 851                 sdev->no_report_opcodes = 1;
 852
 853         /* A few buggy USB-ATA bridges don't understand FUA */
 854         if (devinfo->flags & US_FL_BROKEN_FUA)
 855                 sdev->broken_fua = 1;
 856
 857         /* UAS also needs to support FL_ALWAYS_SYNC */
 858         if (devinfo->flags & US_FL_ALWAYS_SYNC) {
 859                 sdev->skip_ms_page_3f = 1;
 860                 sdev->skip_ms_page_8 = 1;
 861                 sdev->wce_default_on = 1;
 862         }
 863
 864         /* Some disks cannot handle READ_CAPACITY_16 */
 865         if (devinfo->flags & US_FL_NO_READ_CAPACITY_16)
 866                 sdev->no_read_capacity_16 = 1;
 867
 868         /* Some disks cannot handle WRITE_SAME */
 869         if (devinfo->flags & US_FL_NO_SAME)
 870                 sdev->no_write_same = 1;
 871         /*
 872          * Some disks return the total number of blocks in response
 873          * to READ CAPACITY rather than the highest block number.
 874          * If this device makes that mistake, tell the sd driver.
 875          */
 876         if (devinfo->flags & US_FL_FIX_CAPACITY)
 877                 sdev->fix_capacity = 1;
 878
 879         /*
 880          * in some cases we have to guess
 881          */
 882         if (devinfo->flags & US_FL_CAPACITY_HEURISTICS)
 883                 sdev->guess_capacity = 1;
 884
 885         /*
 886          * Some devices don't like MODE SENSE with page=0x3f,
 887          * which is the command used for checking if a device
 888          * is write-protected.  Now that we tell the sd driver
 889          * to do a 192-byte transfer with this command the
 890          * majority of devices work fine, but a few still can't
 891          * handle it.  The sd driver will simply assume those
 892          * devices are write-enabled.
 893          */
 894         if (devinfo->flags & US_FL_NO_WP_DETECT)
 895                 sdev->skip_ms_page_3f = 1;
 896
 897         scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
 898         return 0;
 899 }
 900
 901 static struct scsi_host_template uas_host_template = {
 902         .module = THIS_MODULE,
 903         .name = "uas",
 904         .queuecommand = uas_queuecommand,
 905         .target_alloc = uas_target_alloc,
 906         .slave_alloc = uas_slave_alloc,
 907         .slave_configure = uas_slave_configure,
 908         .eh_abort_handler = uas_eh_abort_handler,
 909         .eh_device_reset_handler = uas_eh_device_reset_handler,
 910         .this_id = -1,
 911         .skip_settle_delay = 1,
 912         .dma_boundary = PAGE_SIZE - 1,
 913 };
 914
 915 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 916                     vendorName, productName, useProtocol, useTransport, \
 917                     initFunction, flags) \
 918 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
 919         .driver_info = (flags) }
 920
 921 static struct usb_device_id uas_usb_ids[] = {
 922 #       include "unusual_uas.h"
 923         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
 924         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
 925         { }
 926 };
 927 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
 928
 929 #undef UNUSUAL_DEV
 930
 931 static int uas_switch_interface(struct usb_device *udev,
 932                                 struct usb_interface *intf)
 933 {
 934         struct usb_host_interface *alt;
 935
 936         alt = uas_find_uas_alt_setting(intf);
 937         if (!alt)
 938                 return -ENODEV;
 939
 940         return usb_set_interface(udev, alt->desc.bInterfaceNumber,
 941                         alt->desc.bAlternateSetting);
 942 }
 943
 944 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
 945 {
 946         struct usb_host_endpoint *eps[4] = { };
 947         struct usb_device *udev = devinfo->udev;
 948         int r;
 949
 950         r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
 951         if (r)
 952                 return r;
 953
 954         devinfo->cmd_pipe = usb_sndbulkpipe(udev,
 955                                             usb_endpoint_num(&eps[0]->desc));
 956         devinfo->status_pipe = usb_rcvbulkpipe(udev,
 957                                             usb_endpoint_num(&eps[1]->desc));
 958         devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
 959                                             usb_endpoint_num(&eps[2]->desc));
 960         devinfo->data_out_pipe = usb_sndbulkpipe(udev,
 961                                             usb_endpoint_num(&eps[3]->desc));
 962
 963         if (udev->speed < USB_SPEED_SUPER) {
 964                 devinfo->qdepth = 32;
 965                 devinfo->use_streams = 0;
 966         } else {
 967                 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
 968                                                     3, MAX_CMNDS, GFP_NOIO);
 969                 if (devinfo->qdepth < 0)
 970                         return devinfo->qdepth;
 971                 devinfo->use_streams = 1;
 972         }
 973
 974         return 0;
 975 }
 976
 977 static void uas_free_streams(struct uas_dev_info *devinfo)
 978 {
 979         struct usb_device *udev = devinfo->udev;
 980         struct usb_host_endpoint *eps[3];
 981
 982         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 983         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 984         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 985         usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
 986 }
 987
 988 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 989 {
 990         int result = -ENOMEM;
 991         struct Scsi_Host *shost = NULL;
 992         struct uas_dev_info *devinfo;
 993         struct usb_device *udev = interface_to_usbdev(intf);
 994         unsigned long dev_flags;
 995
 996         if (!uas_use_uas_driver(intf, id, &dev_flags))
 997                 return -ENODEV;
 998
 999         if (uas_switch_interface(udev, intf))
1000                 return -ENODEV;
1001
1002         shost = scsi_host_alloc(&uas_host_template,
1003                                 sizeof(struct uas_dev_info));
1004         if (!shost)
1005                 goto set_alt0;
1006
1007         shost->max_cmd_len = 16 + 252;
1008         shost->max_id = 1;
1009         shost->max_lun = 256;
1010         shost->max_channel = 0;
1011         shost->sg_tablesize = udev->bus->sg_tablesize;
1012
1013         devinfo = (struct uas_dev_info *)shost->hostdata;
1014         devinfo->intf = intf;
1015         devinfo->udev = udev;
1016         devinfo->resetting = 0;
1017         devinfo->shutdown = 0;
1018         devinfo->flags = dev_flags;
1019         init_usb_anchor(&devinfo->cmd_urbs);
1020         init_usb_anchor(&devinfo->sense_urbs);
1021         init_usb_anchor(&devinfo->data_urbs);
1022         spin_lock_init(&devinfo->lock);
1023         INIT_WORK(&devinfo->work, uas_do_work);
1024         INIT_WORK(&devinfo->scan_work, uas_scan_work);
1025
1026         result = uas_configure_endpoints(devinfo);
1027         if (result)
1028                 goto set_alt0;
1029
1030         /*
1031          * 1 tag is reserved for untagged commands +
1032          * 1 tag to avoid off by one errors in some bridge firmwares
1033          */
1034         shost->can_queue = devinfo->qdepth - 2;
1035
1036         usb_set_intfdata(intf, shost);
1037         result = scsi_add_host(shost, &intf->dev);
1038         if (result)
1039                 goto free_streams;
1040
1041         /* Submit the delayed_work for SCSI-device scanning */
1042         schedule_work(&devinfo->scan_work);
1043
1044         return result;
1045
1046 free_streams:
1047         uas_free_streams(devinfo);
1048         usb_set_intfdata(intf, NULL);
1049 set_alt0:
1050         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1051         if (shost)
1052                 scsi_host_put(shost);
1053         return result;
1054 }
1055
1056 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
1057 {
1058         unsigned long flags;
1059         int i, r = 1;
1060
1061         spin_lock_irqsave(&devinfo->lock, flags);
1062
1063         for (i = 0; i < devinfo->qdepth; i++) {
1064                 if (devinfo->cmnd[i]) {
1065                         r = 0; /* Not empty */
1066                         break;
1067                 }
1068         }
1069
1070         spin_unlock_irqrestore(&devinfo->lock, flags);
1071
1072         return r;
1073 }
1074
1075 /*
1076  * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1077  * get empty while there still is more work to do due to sense-urbs completing
1078  * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1079  */
1080 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1081 {
1082         unsigned long start_time;
1083         int r;
1084
1085         start_time = jiffies;
1086         do {
1087                 flush_work(&devinfo->work);
1088
1089                 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1090                 if (r == 0)
1091                         return -ETIME;
1092
1093                 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1094                 if (r == 0)
1095                         return -ETIME;
1096
1097                 if (time_after(jiffies, start_time + 5 * HZ))
1098                         return -ETIME;
1099         } while (!uas_cmnd_list_empty(devinfo));
1100
1101         return 0;
1102 }
1103
1104 static int uas_pre_reset(struct usb_interface *intf)
1105 {
1106         struct Scsi_Host *shost = usb_get_intfdata(intf);
1107         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1108         unsigned long flags;
1109
1110         if (devinfo->shutdown)
1111                 return 0;
1112
1113         /* Block new requests */
1114         spin_lock_irqsave(shost->host_lock, flags);
1115         scsi_block_requests(shost);
1116         spin_unlock_irqrestore(shost->host_lock, flags);
1117
1118         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1119                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1120                 scsi_unblock_requests(shost);
1121                 return 1;
1122         }
1123
1124         uas_free_streams(devinfo);
1125
1126         return 0;
1127 }
1128
1129 static int uas_post_reset(struct usb_interface *intf)
1130 {
1131         struct Scsi_Host *shost = usb_get_intfdata(intf);
1132         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1133         unsigned long flags;
1134         int err;
1135
1136         if (devinfo->shutdown)
1137                 return 0;
1138
1139         err = uas_configure_endpoints(devinfo);
1140         if (err && err != -ENODEV)
1141                 shost_printk(KERN_ERR, shost,
1142                              "%s: alloc streams error %d after reset",
1143                              __func__, err);
1144
1145         /* we must unblock the host in every case lest we deadlock */
1146         spin_lock_irqsave(shost->host_lock, flags);
1147         scsi_report_bus_reset(shost, 0);
1148         spin_unlock_irqrestore(shost->host_lock, flags);
1149
1150         scsi_unblock_requests(shost);
1151
1152         return err ? 1 : 0;
1153 }
1154
1155 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1156 {
1157         struct Scsi_Host *shost = usb_get_intfdata(intf);
1158         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1159
1160         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1161                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1162                 return -ETIME;
1163         }
1164
1165         return 0;
1166 }
1167
1168 static int uas_resume(struct usb_interface *intf)
1169 {
1170         return 0;
1171 }
1172
1173 static int uas_reset_resume(struct usb_interface *intf)
1174 {
1175         struct Scsi_Host *shost = usb_get_intfdata(intf);
1176         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1177         unsigned long flags;
1178         int err;
1179
1180         err = uas_configure_endpoints(devinfo);
1181         if (err) {
1182                 shost_printk(KERN_ERR, shost,
1183                              "%s: alloc streams error %d after reset",
1184                              __func__, err);
1185                 return -EIO;
1186         }
1187
1188         spin_lock_irqsave(shost->host_lock, flags);
1189         scsi_report_bus_reset(shost, 0);
1190         spin_unlock_irqrestore(shost->host_lock, flags);
1191
1192         return 0;
1193 }
1194
1195 static void uas_disconnect(struct usb_interface *intf)
1196 {
1197         struct Scsi_Host *shost = usb_get_intfdata(intf);
1198         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1199         unsigned long flags;
1200
1201         spin_lock_irqsave(&devinfo->lock, flags);
1202         devinfo->resetting = 1;
1203         spin_unlock_irqrestore(&devinfo->lock, flags);
1204
1205         cancel_work_sync(&devinfo->work);
1206         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1207         usb_kill_anchored_urbs(&devinfo->sense_urbs);
1208         usb_kill_anchored_urbs(&devinfo->data_urbs);
1209         uas_zap_pending(devinfo, DID_NO_CONNECT);
1210
1211         /*
1212          * Prevent SCSI scanning (if it hasn't started yet)
1213          * or wait for the SCSI-scanning routine to stop.
1214          */
1215         cancel_work_sync(&devinfo->scan_work);
1216
1217         scsi_remove_host(shost);
1218         uas_free_streams(devinfo);
1219         scsi_host_put(shost);
1220 }
1221
1222 /*
1223  * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1224  * hang on reboot when the device is still in uas mode. Note the reset is
1225  * necessary as some devices won't revert to usb-storage mode without it.
1226  */
1227 static void uas_shutdown(struct device *dev)
1228 {
1229         struct usb_interface *intf = to_usb_interface(dev);
1230         struct usb_device *udev = interface_to_usbdev(intf);
1231         struct Scsi_Host *shost = usb_get_intfdata(intf);
1232         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1233
1234         if (system_state != SYSTEM_RESTART)
1235                 return;
1236
1237         devinfo->shutdown = 1;
1238         uas_free_streams(devinfo);
1239         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1240         usb_reset_device(udev);
1241 }
1242
1243 static struct usb_driver uas_driver = {
1244         .name = "uas",
1245         .probe = uas_probe,
1246         .disconnect = uas_disconnect,
1247         .pre_reset = uas_pre_reset,
1248         .post_reset = uas_post_reset,
1249         .suspend = uas_suspend,
1250         .resume = uas_resume,
1251         .reset_resume = uas_reset_resume,
1252         .drvwrap.driver.shutdown = uas_shutdown,
1253         .id_table = uas_usb_ids,
1254 };
1255
1256 static int __init uas_init(void)
1257 {
1258         int rv;
1259
1260         workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0);
1261         if (!workqueue)
1262                 return -ENOMEM;
1263
1264         rv = usb_register(&uas_driver);
1265         if (rv) {
1266                 destroy_workqueue(workqueue);
1267                 return -ENOMEM;
1268         }
1269
1270         return 0;
1271 }
1272
1273 static void __exit uas_exit(void)
1274 {
1275         usb_deregister(&uas_driver);
1276         destroy_workqueue(workqueue);
1277 }
1278
1279 module_init(uas_init);
1280 module_exit(uas_exit);
1281
1282 MODULE_LICENSE("GPL");
1283 MODULE_IMPORT_NS(USB_STORAGE);
1284 MODULE_AUTHOR(
1285         "Hans de Goede <[email protected]>, Matthew Wilcox and Sarah Sharp");