drivers/usb/storage/uas.c

   1 /*
   2  * USB Attached SCSI
   3  * Note that this is not the same as the USB Mass Storage driver
   4  *
   5  * Copyright Matthew Wilcox for Intel Corp, 2010
   6  * Copyright Sarah Sharp for Intel Corp, 2010
   7  *
   8  * Distributed under the terms of the GNU GPL, version two.
   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
  31 /*
  32  * The r00-r01c specs define this version of the SENSE IU data structure.
  33  * It's still in use by several different firmware releases.
  34  */
  35 struct sense_iu_old {
  36         __u8 iu_id;
  37         __u8 rsvd1;
  38         __be16 tag;
  39         __be16 len;
  40         __u8 status;
  41         __u8 service_response;
  42         __u8 sense[SCSI_SENSE_BUFFERSIZE];
  43 };
  44
  45 struct uas_dev_info {
  46         struct usb_interface *intf;
  47         struct usb_device *udev;
  48         struct usb_anchor cmd_urbs;
  49         struct usb_anchor sense_urbs;
  50         struct usb_anchor data_urbs;
  51         int qdepth, resetting;
  52         struct response_iu response;
  53         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
  54         unsigned use_streams:1;
  55         unsigned uas_sense_old:1;
  56         struct scsi_cmnd *cmnd;
  57         spinlock_t lock;
  58         struct work_struct work;
  59         struct list_head work_list;
  60         struct list_head dead_list;
  61 };
  62
  63 enum {
  64         SUBMIT_STATUS_URB       = (1 << 1),
  65         ALLOC_DATA_IN_URB       = (1 << 2),
  66         SUBMIT_DATA_IN_URB      = (1 << 3),
  67         ALLOC_DATA_OUT_URB      = (1 << 4),
  68         SUBMIT_DATA_OUT_URB     = (1 << 5),
  69         ALLOC_CMD_URB           = (1 << 6),
  70         SUBMIT_CMD_URB          = (1 << 7),
  71         COMMAND_INFLIGHT        = (1 << 8),
  72         DATA_IN_URB_INFLIGHT    = (1 << 9),
  73         DATA_OUT_URB_INFLIGHT   = (1 << 10),
  74         COMMAND_COMPLETED       = (1 << 11),
  75         COMMAND_ABORTED         = (1 << 12),
  76         UNLINK_DATA_URBS        = (1 << 13),
  77         IS_IN_WORK_LIST         = (1 << 14),
  78 };
  79
  80 /* Overrides scsi_pointer */
  81 struct uas_cmd_info {
  82         unsigned int state;
  83         unsigned int stream;
  84         struct urb *cmd_urb;
  85         struct urb *data_in_urb;
  86         struct urb *data_out_urb;
  87         struct list_head work;
  88         struct list_head dead;
  89 };
  90
  91 /* I hate forward declarations, but I actually have a loop */
  92 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
  93                                 struct uas_dev_info *devinfo, gfp_t gfp);
  94 static void uas_do_work(struct work_struct *work);
  95 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
  96 static void uas_configure_endpoints(struct uas_dev_info *devinfo);
  97 static void uas_free_streams(struct uas_dev_info *devinfo);
  98 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller);
  99
 100 /* Must be called with devinfo->lock held, will temporary unlock the lock */
 101 static void uas_unlink_data_urbs(struct uas_dev_info *devinfo,
 102                                  struct uas_cmd_info *cmdinfo,
 103                                  unsigned long *lock_flags)
 104 {
 105         /*
 106          * The UNLINK_DATA_URBS flag makes sure uas_try_complete
 107          * (called by urb completion) doesn't release cmdinfo
 108          * underneath us.
 109          */
 110         cmdinfo->state |= UNLINK_DATA_URBS;
 111         spin_unlock_irqrestore(&devinfo->lock, *lock_flags);
 112
 113         if (cmdinfo->data_in_urb)
 114                 usb_unlink_urb(cmdinfo->data_in_urb);
 115         if (cmdinfo->data_out_urb)
 116                 usb_unlink_urb(cmdinfo->data_out_urb);
 117
 118         spin_lock_irqsave(&devinfo->lock, *lock_flags);
 119         cmdinfo->state &= ~UNLINK_DATA_URBS;
 120 }
 121
 122 static void uas_do_work(struct work_struct *work)
 123 {
 124         struct uas_dev_info *devinfo =
 125                 container_of(work, struct uas_dev_info, work);
 126         struct uas_cmd_info *cmdinfo;
 127         struct uas_cmd_info *temp;
 128         unsigned long flags;
 129         int err;
 130
 131         spin_lock_irqsave(&devinfo->lock, flags);
 132         list_for_each_entry_safe(cmdinfo, temp, &devinfo->work_list, work) {
 133                 struct scsi_pointer *scp = (void *)cmdinfo;
 134                 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd,
 135                                                       SCp);
 136                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 137                 if (!err) {
 138                         cmdinfo->state &= ~IS_IN_WORK_LIST;
 139                         list_del(&cmdinfo->work);
 140                 } else {
 141                         schedule_work(&devinfo->work);
 142                 }
 143         }
 144         spin_unlock_irqrestore(&devinfo->lock, flags);
 145 }
 146
 147 static void uas_abort_work(struct uas_dev_info *devinfo)
 148 {
 149         struct uas_cmd_info *cmdinfo;
 150         struct uas_cmd_info *temp;
 151         unsigned long flags;
 152
 153         spin_lock_irqsave(&devinfo->lock, flags);
 154         list_for_each_entry_safe(cmdinfo, temp, &devinfo->work_list, work) {
 155                 struct scsi_pointer *scp = (void *)cmdinfo;
 156                 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd,
 157                                                       SCp);
 158                 uas_log_cmd_state(cmnd, __func__);
 159                 WARN_ON_ONCE(cmdinfo->state & COMMAND_ABORTED);
 160                 cmdinfo->state |= COMMAND_ABORTED;
 161                 cmdinfo->state &= ~IS_IN_WORK_LIST;
 162                 list_del(&cmdinfo->work);
 163                 list_add_tail(&cmdinfo->dead, &devinfo->dead_list);
 164         }
 165         spin_unlock_irqrestore(&devinfo->lock, flags);
 166 }
 167
 168 static void uas_add_work(struct uas_cmd_info *cmdinfo)
 169 {
 170         struct scsi_pointer *scp = (void *)cmdinfo;
 171         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 172         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 173
 174         WARN_ON_ONCE(!spin_is_locked(&devinfo->lock));
 175         list_add_tail(&cmdinfo->work, &devinfo->work_list);
 176         cmdinfo->state |= IS_IN_WORK_LIST;
 177         schedule_work(&devinfo->work);
 178 }
 179
 180 static void uas_zap_dead(struct uas_dev_info *devinfo)
 181 {
 182         struct uas_cmd_info *cmdinfo;
 183         struct uas_cmd_info *temp;
 184         unsigned long flags;
 185
 186         spin_lock_irqsave(&devinfo->lock, flags);
 187         list_for_each_entry_safe(cmdinfo, temp, &devinfo->dead_list, dead) {
 188                 struct scsi_pointer *scp = (void *)cmdinfo;
 189                 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd,
 190                                                       SCp);
 191                 uas_log_cmd_state(cmnd, __func__);
 192                 WARN_ON_ONCE(!(cmdinfo->state & COMMAND_ABORTED));
 193                 /* all urbs are killed, clear inflight bits */
 194                 cmdinfo->state &= ~(COMMAND_INFLIGHT |
 195                                     DATA_IN_URB_INFLIGHT |
 196                                     DATA_OUT_URB_INFLIGHT);
 197                 uas_try_complete(cmnd, __func__);
 198         }
 199         spin_unlock_irqrestore(&devinfo->lock, flags);
 200 }
 201
 202 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
 203 {
 204         struct sense_iu *sense_iu = urb->transfer_buffer;
 205         struct scsi_device *sdev = cmnd->device;
 206
 207         if (urb->actual_length > 16) {
 208                 unsigned len = be16_to_cpup(&sense_iu->len);
 209                 if (len + 16 != urb->actual_length) {
 210                         int newlen = min(len + 16, urb->actual_length) - 16;
 211                         if (newlen < 0)
 212                                 newlen = 0;
 213                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 214                                 "disagrees with IU sense data length %d, "
 215                                 "using %d bytes of sense data\n", __func__,
 216                                         urb->actual_length, len, newlen);
 217                         len = newlen;
 218                 }
 219                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 220         }
 221
 222         cmnd->result = sense_iu->status;
 223 }
 224
 225 static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
 226 {
 227         struct sense_iu_old *sense_iu = urb->transfer_buffer;
 228         struct scsi_device *sdev = cmnd->device;
 229
 230         if (urb->actual_length > 8) {
 231                 unsigned len = be16_to_cpup(&sense_iu->len) - 2;
 232                 if (len + 8 != urb->actual_length) {
 233                         int newlen = min(len + 8, urb->actual_length) - 8;
 234                         if (newlen < 0)
 235                                 newlen = 0;
 236                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 237                                 "disagrees with IU sense data length %d, "
 238                                 "using %d bytes of sense data\n", __func__,
 239                                         urb->actual_length, len, newlen);
 240                         len = newlen;
 241                 }
 242                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 243         }
 244
 245         cmnd->result = sense_iu->status;
 246 }
 247
 248 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller)
 249 {
 250         struct uas_cmd_info *ci = (void *)&cmnd->SCp;
 251
 252         scmd_printk(KERN_INFO, cmnd, "%s %p tag %d, inflight:"
 253                     "%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
 254                     caller, cmnd, cmnd->request->tag,
 255                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
 256                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
 257                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
 258                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
 259                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
 260                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
 261                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
 262                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
 263                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
 264                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
 265                     (ci->state & COMMAND_COMPLETED)     ? " done"  : "",
 266                     (ci->state & COMMAND_ABORTED)       ? " abort" : "",
 267                     (ci->state & UNLINK_DATA_URBS)      ? " unlink": "",
 268                     (ci->state & IS_IN_WORK_LIST)       ? " work"  : "");
 269 }
 270
 271 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 272 {
 273         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 274         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 275
 276         WARN_ON_ONCE(!spin_is_locked(&devinfo->lock));
 277         if (cmdinfo->state & (COMMAND_INFLIGHT |
 278                               DATA_IN_URB_INFLIGHT |
 279                               DATA_OUT_URB_INFLIGHT |
 280                               UNLINK_DATA_URBS))
 281                 return -EBUSY;
 282         WARN_ON_ONCE(cmdinfo->state & COMMAND_COMPLETED);
 283         cmdinfo->state |= COMMAND_COMPLETED;
 284         usb_free_urb(cmdinfo->data_in_urb);
 285         usb_free_urb(cmdinfo->data_out_urb);
 286         if (cmdinfo->state & COMMAND_ABORTED) {
 287                 scmd_printk(KERN_INFO, cmnd, "abort completed\n");
 288                 cmnd->result = DID_ABORT << 16;
 289                 list_del(&cmdinfo->dead);
 290         }
 291         cmnd->scsi_done(cmnd);
 292         return 0;
 293 }
 294
 295 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
 296                           unsigned direction)
 297 {
 298         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 299         int err;
 300
 301         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
 302         err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 303         if (err) {
 304                 uas_add_work(cmdinfo);
 305         }
 306 }
 307
 308 static void uas_stat_cmplt(struct urb *urb)
 309 {
 310         struct iu *iu = urb->transfer_buffer;
 311         struct Scsi_Host *shost = urb->context;
 312         struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
 313         struct scsi_cmnd *cmnd;
 314         struct uas_cmd_info *cmdinfo;
 315         unsigned long flags;
 316         u16 tag;
 317
 318         if (urb->status) {
 319                 if (urb->status == -ENOENT) {
 320                         dev_err(&urb->dev->dev, "stat urb: killed, stream %d\n",
 321                                 urb->stream_id);
 322                 } else {
 323                         dev_err(&urb->dev->dev, "stat urb: status %d\n",
 324                                 urb->status);
 325                 }
 326                 usb_free_urb(urb);
 327                 return;
 328         }
 329
 330         if (devinfo->resetting) {
 331                 usb_free_urb(urb);
 332                 return;
 333         }
 334
 335         spin_lock_irqsave(&devinfo->lock, flags);
 336         tag = be16_to_cpup(&iu->tag) - 1;
 337         if (tag == 0)
 338                 cmnd = devinfo->cmnd;
 339         else
 340                 cmnd = scsi_host_find_tag(shost, tag - 1);
 341
 342         if (!cmnd) {
 343                 if (iu->iu_id == IU_ID_RESPONSE) {
 344                         /* store results for uas_eh_task_mgmt() */
 345                         memcpy(&devinfo->response, iu, sizeof(devinfo->response));
 346                 }
 347                 usb_free_urb(urb);
 348                 spin_unlock_irqrestore(&devinfo->lock, flags);
 349                 return;
 350         }
 351
 352         cmdinfo = (void *)&cmnd->SCp;
 353         switch (iu->iu_id) {
 354         case IU_ID_STATUS:
 355                 if (devinfo->cmnd == cmnd)
 356                         devinfo->cmnd = NULL;
 357
 358                 if (urb->actual_length < 16)
 359                         devinfo->uas_sense_old = 1;
 360                 if (devinfo->uas_sense_old)
 361                         uas_sense_old(urb, cmnd);
 362                 else
 363                         uas_sense(urb, cmnd);
 364                 if (cmnd->result != 0) {
 365                         /* cancel data transfers on error */
 366                         uas_unlink_data_urbs(devinfo, cmdinfo, &flags);
 367                 }
 368                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 369                 uas_try_complete(cmnd, __func__);
 370                 break;
 371         case IU_ID_READ_READY:
 372                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
 373                 break;
 374         case IU_ID_WRITE_READY:
 375                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
 376                 break;
 377         default:
 378                 scmd_printk(KERN_ERR, cmnd,
 379                         "Bogus IU (%d) received on status pipe\n", iu->iu_id);
 380         }
 381         usb_free_urb(urb);
 382         spin_unlock_irqrestore(&devinfo->lock, flags);
 383 }
 384
 385 static void uas_data_cmplt(struct urb *urb)
 386 {
 387         struct scsi_cmnd *cmnd = urb->context;
 388         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 389         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 390         struct scsi_data_buffer *sdb = NULL;
 391         unsigned long flags;
 392
 393         spin_lock_irqsave(&devinfo->lock, flags);
 394         if (cmdinfo->data_in_urb == urb) {
 395                 sdb = scsi_in(cmnd);
 396                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
 397         } else if (cmdinfo->data_out_urb == urb) {
 398                 sdb = scsi_out(cmnd);
 399                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
 400         }
 401         if (sdb == NULL) {
 402                 WARN_ON_ONCE(1);
 403         } else if (urb->status) {
 404                 /* error: no data transfered */
 405                 sdb->resid = sdb->length;
 406         } else {
 407                 sdb->resid = sdb->length - urb->actual_length;
 408         }
 409         uas_try_complete(cmnd, __func__);
 410         spin_unlock_irqrestore(&devinfo->lock, flags);
 411 }
 412
 413 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 414                                       unsigned int pipe, u16 stream_id,
 415                                       struct scsi_cmnd *cmnd,
 416                                       enum dma_data_direction dir)
 417 {
 418         struct usb_device *udev = devinfo->udev;
 419         struct urb *urb = usb_alloc_urb(0, gfp);
 420         struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
 421                 ? scsi_in(cmnd) : scsi_out(cmnd);
 422
 423         if (!urb)
 424                 goto out;
 425         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
 426                           uas_data_cmplt, cmnd);
 427         if (devinfo->use_streams)
 428                 urb->stream_id = stream_id;
 429         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
 430         urb->sg = sdb->table.sgl;
 431  out:
 432         return urb;
 433 }
 434
 435 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 436                                        struct Scsi_Host *shost, u16 stream_id)
 437 {
 438         struct usb_device *udev = devinfo->udev;
 439         struct urb *urb = usb_alloc_urb(0, gfp);
 440         struct sense_iu *iu;
 441
 442         if (!urb)
 443                 goto out;
 444
 445         iu = kzalloc(sizeof(*iu), gfp);
 446         if (!iu)
 447                 goto free;
 448
 449         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
 450                                                 uas_stat_cmplt, shost);
 451         urb->stream_id = stream_id;
 452         urb->transfer_flags |= URB_FREE_BUFFER;
 453  out:
 454         return urb;
 455  free:
 456         usb_free_urb(urb);
 457         return NULL;
 458 }
 459
 460 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 461                                         struct scsi_cmnd *cmnd)
 462 {
 463         struct usb_device *udev = devinfo->udev;
 464         struct scsi_device *sdev = cmnd->device;
 465         struct urb *urb = usb_alloc_urb(0, gfp);
 466         struct command_iu *iu;
 467         int len;
 468
 469         if (!urb)
 470                 goto out;
 471
 472         len = cmnd->cmd_len - 16;
 473         if (len < 0)
 474                 len = 0;
 475         len = ALIGN(len, 4);
 476         iu = kzalloc(sizeof(*iu) + len, gfp);
 477         if (!iu)
 478                 goto free;
 479
 480         iu->iu_id = IU_ID_COMMAND;
 481         if (blk_rq_tagged(cmnd->request))
 482                 iu->tag = cpu_to_be16(cmnd->request->tag + 2);
 483         else
 484                 iu->tag = cpu_to_be16(1);
 485         iu->prio_attr = UAS_SIMPLE_TAG;
 486         iu->len = len;
 487         int_to_scsilun(sdev->lun, &iu->lun);
 488         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 489
 490         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
 491                                                         usb_free_urb, NULL);
 492         urb->transfer_flags |= URB_FREE_BUFFER;
 493  out:
 494         return urb;
 495  free:
 496         usb_free_urb(urb);
 497         return NULL;
 498 }
 499
 500 static int uas_submit_task_urb(struct scsi_cmnd *cmnd, gfp_t gfp,
 501                                u8 function, u16 stream_id)
 502 {
 503         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 504         struct usb_device *udev = devinfo->udev;
 505         struct urb *urb = usb_alloc_urb(0, gfp);
 506         struct task_mgmt_iu *iu;
 507         int err = -ENOMEM;
 508
 509         if (!urb)
 510                 goto err;
 511
 512         iu = kzalloc(sizeof(*iu), gfp);
 513         if (!iu)
 514                 goto err;
 515
 516         iu->iu_id = IU_ID_TASK_MGMT;
 517         iu->tag = cpu_to_be16(stream_id);
 518         int_to_scsilun(cmnd->device->lun, &iu->lun);
 519
 520         iu->function = function;
 521         switch (function) {
 522         case TMF_ABORT_TASK:
 523                 if (blk_rq_tagged(cmnd->request))
 524                         iu->task_tag = cpu_to_be16(cmnd->request->tag + 2);
 525                 else
 526                         iu->task_tag = cpu_to_be16(1);
 527                 break;
 528         }
 529
 530         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu),
 531                           usb_free_urb, NULL);
 532         urb->transfer_flags |= URB_FREE_BUFFER;
 533
 534         usb_anchor_urb(urb, &devinfo->cmd_urbs);
 535         err = usb_submit_urb(urb, gfp);
 536         if (err) {
 537                 usb_unanchor_urb(urb);
 538                 goto err;
 539         }
 540
 541         return 0;
 542
 543 err:
 544         usb_free_urb(urb);
 545         return err;
 546 }
 547
 548 /*
 549  * Why should I request the Status IU before sending the Command IU?  Spec
 550  * says to, but also says the device may receive them in any order.  Seems
 551  * daft to me.
 552  */
 553
 554 static int uas_submit_sense_urb(struct Scsi_Host *shost,
 555                                 gfp_t gfp, unsigned int stream)
 556 {
 557         struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
 558         struct urb *urb;
 559
 560         urb = uas_alloc_sense_urb(devinfo, gfp, shost, stream);
 561         if (!urb)
 562                 return SCSI_MLQUEUE_DEVICE_BUSY;
 563         usb_anchor_urb(urb, &devinfo->sense_urbs);
 564         if (usb_submit_urb(urb, gfp)) {
 565                 usb_unanchor_urb(urb);
 566                 shost_printk(KERN_INFO, shost,
 567                              "sense urb submission failure\n");
 568                 usb_free_urb(urb);
 569                 return SCSI_MLQUEUE_DEVICE_BUSY;
 570         }
 571         return 0;
 572 }
 573
 574 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 575                            struct uas_dev_info *devinfo, gfp_t gfp)
 576 {
 577         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 578         int err;
 579
 580         WARN_ON_ONCE(!spin_is_locked(&devinfo->lock));
 581         if (cmdinfo->state & SUBMIT_STATUS_URB) {
 582                 err = uas_submit_sense_urb(cmnd->device->host, gfp,
 583                                            cmdinfo->stream);
 584                 if (err) {
 585                         return err;
 586                 }
 587                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
 588         }
 589
 590         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
 591                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
 592                                         devinfo->data_in_pipe, cmdinfo->stream,
 593                                         cmnd, DMA_FROM_DEVICE);
 594                 if (!cmdinfo->data_in_urb)
 595                         return SCSI_MLQUEUE_DEVICE_BUSY;
 596                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
 597         }
 598
 599         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
 600                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 601                 if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) {
 602                         usb_unanchor_urb(cmdinfo->data_in_urb);
 603                         scmd_printk(KERN_INFO, cmnd,
 604                                         "data in urb submission failure\n");
 605                         return SCSI_MLQUEUE_DEVICE_BUSY;
 606                 }
 607                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 608                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
 609         }
 610
 611         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
 612                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
 613                                         devinfo->data_out_pipe, cmdinfo->stream,
 614                                         cmnd, DMA_TO_DEVICE);
 615                 if (!cmdinfo->data_out_urb)
 616                         return SCSI_MLQUEUE_DEVICE_BUSY;
 617                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
 618         }
 619
 620         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
 621                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 622                 if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) {
 623                         usb_unanchor_urb(cmdinfo->data_out_urb);
 624                         scmd_printk(KERN_INFO, cmnd,
 625                                         "data out urb submission failure\n");
 626                         return SCSI_MLQUEUE_DEVICE_BUSY;
 627                 }
 628                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 629                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
 630         }
 631
 632         if (cmdinfo->state & ALLOC_CMD_URB) {
 633                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd);
 634                 if (!cmdinfo->cmd_urb)
 635                         return SCSI_MLQUEUE_DEVICE_BUSY;
 636                 cmdinfo->state &= ~ALLOC_CMD_URB;
 637         }
 638
 639         if (cmdinfo->state & SUBMIT_CMD_URB) {
 640                 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
 641                 if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) {
 642                         usb_unanchor_urb(cmdinfo->cmd_urb);
 643                         scmd_printk(KERN_INFO, cmnd,
 644                                         "cmd urb submission failure\n");
 645                         return SCSI_MLQUEUE_DEVICE_BUSY;
 646                 }
 647                 cmdinfo->cmd_urb = NULL;
 648                 cmdinfo->state &= ~SUBMIT_CMD_URB;
 649                 cmdinfo->state |= COMMAND_INFLIGHT;
 650         }
 651
 652         return 0;
 653 }
 654
 655 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
 656                                         void (*done)(struct scsi_cmnd *))
 657 {
 658         struct scsi_device *sdev = cmnd->device;
 659         struct uas_dev_info *devinfo = sdev->hostdata;
 660         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 661         unsigned long flags;
 662         int err;
 663
 664         BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
 665
 666         if (devinfo->resetting) {
 667                 cmnd->result = DID_ERROR << 16;
 668                 cmnd->scsi_done(cmnd);
 669                 return 0;
 670         }
 671
 672         spin_lock_irqsave(&devinfo->lock, flags);
 673         if (devinfo->cmnd) {
 674                 spin_unlock_irqrestore(&devinfo->lock, flags);
 675                 return SCSI_MLQUEUE_DEVICE_BUSY;
 676         }
 677
 678         if (blk_rq_tagged(cmnd->request)) {
 679                 cmdinfo->stream = cmnd->request->tag + 2;
 680         } else {
 681                 devinfo->cmnd = cmnd;
 682                 cmdinfo->stream = 1;
 683         }
 684
 685         cmnd->scsi_done = done;
 686
 687         cmdinfo->state = SUBMIT_STATUS_URB |
 688                         ALLOC_CMD_URB | SUBMIT_CMD_URB;
 689
 690         switch (cmnd->sc_data_direction) {
 691         case DMA_FROM_DEVICE:
 692                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 693                 break;
 694         case DMA_BIDIRECTIONAL:
 695                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 696         case DMA_TO_DEVICE:
 697                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
 698         case DMA_NONE:
 699                 break;
 700         }
 701
 702         if (!devinfo->use_streams) {
 703                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
 704                 cmdinfo->stream = 0;
 705         }
 706
 707         err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
 708         if (err) {
 709                 /* If we did nothing, give up now */
 710                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
 711                         spin_unlock_irqrestore(&devinfo->lock, flags);
 712                         return SCSI_MLQUEUE_DEVICE_BUSY;
 713                 }
 714                 uas_add_work(cmdinfo);
 715         }
 716
 717         spin_unlock_irqrestore(&devinfo->lock, flags);
 718         return 0;
 719 }
 720
 721 static DEF_SCSI_QCMD(uas_queuecommand)
 722
 723 static int uas_eh_task_mgmt(struct scsi_cmnd *cmnd,
 724                             const char *fname, u8 function)
 725 {
 726         struct Scsi_Host *shost = cmnd->device->host;
 727         struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
 728         u16 tag = devinfo->qdepth;
 729         unsigned long flags;
 730
 731         spin_lock_irqsave(&devinfo->lock, flags);
 732         memset(&devinfo->response, 0, sizeof(devinfo->response));
 733         if (uas_submit_sense_urb(shost, GFP_ATOMIC, tag)) {
 734                 shost_printk(KERN_INFO, shost,
 735                              "%s: %s: submit sense urb failed\n",
 736                              __func__, fname);
 737                 spin_unlock_irqrestore(&devinfo->lock, flags);
 738                 return FAILED;
 739         }
 740         if (uas_submit_task_urb(cmnd, GFP_ATOMIC, function, tag)) {
 741                 shost_printk(KERN_INFO, shost,
 742                              "%s: %s: submit task mgmt urb failed\n",
 743                              __func__, fname);
 744                 spin_unlock_irqrestore(&devinfo->lock, flags);
 745                 return FAILED;
 746         }
 747         spin_unlock_irqrestore(&devinfo->lock, flags);
 748
 749         if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 3000) == 0) {
 750                 shost_printk(KERN_INFO, shost,
 751                              "%s: %s timed out\n", __func__, fname);
 752                 return FAILED;
 753         }
 754         if (be16_to_cpu(devinfo->response.tag) != tag) {
 755                 shost_printk(KERN_INFO, shost,
 756                              "%s: %s failed (wrong tag %d/%d)\n", __func__,
 757                              fname, be16_to_cpu(devinfo->response.tag), tag);
 758                 return FAILED;
 759         }
 760         if (devinfo->response.response_code != RC_TMF_COMPLETE) {
 761                 shost_printk(KERN_INFO, shost,
 762                              "%s: %s failed (rc 0x%x)\n", __func__,
 763                              fname, devinfo->response.response_code);
 764                 return FAILED;
 765         }
 766         return SUCCESS;
 767 }
 768
 769 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
 770 {
 771         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 772         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 773         unsigned long flags;
 774         int ret;
 775
 776         uas_log_cmd_state(cmnd, __func__);
 777         spin_lock_irqsave(&devinfo->lock, flags);
 778         WARN_ON_ONCE(cmdinfo->state & COMMAND_ABORTED);
 779         cmdinfo->state |= COMMAND_ABORTED;
 780         list_add_tail(&cmdinfo->dead, &devinfo->dead_list);
 781         if (cmdinfo->state & IS_IN_WORK_LIST) {
 782                 list_del(&cmdinfo->work);
 783                 cmdinfo->state &= ~IS_IN_WORK_LIST;
 784         }
 785         if (cmdinfo->state & COMMAND_INFLIGHT) {
 786                 spin_unlock_irqrestore(&devinfo->lock, flags);
 787                 ret = uas_eh_task_mgmt(cmnd, "ABORT TASK", TMF_ABORT_TASK);
 788         } else {
 789                 uas_unlink_data_urbs(devinfo, cmdinfo, &flags);
 790                 uas_try_complete(cmnd, __func__);
 791                 spin_unlock_irqrestore(&devinfo->lock, flags);
 792                 ret = SUCCESS;
 793         }
 794         return ret;
 795 }
 796
 797 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
 798 {
 799         sdev_printk(KERN_INFO, cmnd->device, "%s\n", __func__);
 800         return uas_eh_task_mgmt(cmnd, "LOGICAL UNIT RESET",
 801                                 TMF_LOGICAL_UNIT_RESET);
 802 }
 803
 804 static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
 805 {
 806         struct scsi_device *sdev = cmnd->device;
 807         struct uas_dev_info *devinfo = sdev->hostdata;
 808         struct usb_device *udev = devinfo->udev;
 809         int err;
 810
 811         err = usb_lock_device_for_reset(udev, devinfo->intf);
 812         if (err) {
 813                 shost_printk(KERN_ERR, sdev->host,
 814                              "%s FAILED to get lock err %d\n", __func__, err);
 815                 return FAILED;
 816         }
 817
 818         shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
 819         devinfo->resetting = 1;
 820         uas_abort_work(devinfo);
 821         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
 822         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 823         usb_kill_anchored_urbs(&devinfo->data_urbs);
 824         uas_zap_dead(devinfo);
 825         err = usb_reset_device(udev);
 826         devinfo->resetting = 0;
 827
 828         usb_unlock_device(udev);
 829
 830         if (err) {
 831                 shost_printk(KERN_INFO, sdev->host, "%s FAILED\n", __func__);
 832                 return FAILED;
 833         }
 834
 835         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
 836         return SUCCESS;
 837 }
 838
 839 static int uas_slave_alloc(struct scsi_device *sdev)
 840 {
 841         sdev->hostdata = (void *)sdev->host->hostdata[0];
 842         return 0;
 843 }
 844
 845 static int uas_slave_configure(struct scsi_device *sdev)
 846 {
 847         struct uas_dev_info *devinfo = sdev->hostdata;
 848         scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
 849         scsi_activate_tcq(sdev, devinfo->qdepth - 2);
 850         return 0;
 851 }
 852
 853 static struct scsi_host_template uas_host_template = {
 854         .module = THIS_MODULE,
 855         .name = "uas",
 856         .queuecommand = uas_queuecommand,
 857         .slave_alloc = uas_slave_alloc,
 858         .slave_configure = uas_slave_configure,
 859         .eh_abort_handler = uas_eh_abort_handler,
 860         .eh_device_reset_handler = uas_eh_device_reset_handler,
 861         .eh_bus_reset_handler = uas_eh_bus_reset_handler,
 862         .can_queue = 65536,     /* Is there a limit on the _host_ ? */
 863         .this_id = -1,
 864         .sg_tablesize = SG_NONE,
 865         .cmd_per_lun = 1,       /* until we override it */
 866         .skip_settle_delay = 1,
 867         .ordered_tag = 1,
 868 };
 869
 870 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 871                     vendorName, productName, useProtocol, useTransport, \
 872                     initFunction, flags) \
 873 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
 874         .driver_info = (flags) }
 875
 876 static struct usb_device_id uas_usb_ids[] = {
 877 #       include "unusual_uas.h"
 878         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
 879         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
 880         /* 0xaa is a prototype device I happen to have access to */
 881         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
 882         { }
 883 };
 884 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
 885
 886 #undef UNUSUAL_DEV
 887
 888 static int uas_switch_interface(struct usb_device *udev,
 889                                 struct usb_interface *intf)
 890 {
 891         int alt;
 892
 893         alt = uas_find_uas_alt_setting(intf);
 894         if (alt < 0)
 895                 return alt;
 896
 897         return usb_set_interface(udev,
 898                         intf->altsetting[0].desc.bInterfaceNumber, alt);
 899 }
 900
 901 static void uas_configure_endpoints(struct uas_dev_info *devinfo)
 902 {
 903         struct usb_host_endpoint *eps[4] = { };
 904         struct usb_interface *intf = devinfo->intf;
 905         struct usb_device *udev = devinfo->udev;
 906         struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint;
 907         unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints;
 908
 909         devinfo->uas_sense_old = 0;
 910         devinfo->cmnd = NULL;
 911
 912         for (i = 0; i < n_endpoints; i++) {
 913                 unsigned char *extra = endpoint[i].extra;
 914                 int len = endpoint[i].extralen;
 915                 while (len > 1) {
 916                         if (extra[1] == USB_DT_PIPE_USAGE) {
 917                                 unsigned pipe_id = extra[2];
 918                                 if (pipe_id > 0 && pipe_id < 5)
 919                                         eps[pipe_id - 1] = &endpoint[i];
 920                                 break;
 921                         }
 922                         len -= extra[0];
 923                         extra += extra[0];
 924                 }
 925         }
 926
 927         /*
 928          * Assume that if we didn't find a control pipe descriptor, we're
 929          * using a device with old firmware that happens to be set up like
 930          * this.
 931          */
 932         if (!eps[0]) {
 933                 devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1);
 934                 devinfo->status_pipe = usb_rcvbulkpipe(udev, 1);
 935                 devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2);
 936                 devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2);
 937
 938                 eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 939                 eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 940                 eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 941         } else {
 942                 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
 943                                              usb_endpoint_num(&eps[0]->desc));
 944                 devinfo->status_pipe = usb_rcvbulkpipe(udev,
 945                                              usb_endpoint_num(&eps[1]->desc));
 946                 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
 947                                              usb_endpoint_num(&eps[2]->desc));
 948                 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
 949                                              usb_endpoint_num(&eps[3]->desc));
 950         }
 951
 952         devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256,
 953                                                                 GFP_KERNEL);
 954         if (devinfo->qdepth < 0) {
 955                 devinfo->qdepth = 256;
 956                 devinfo->use_streams = 0;
 957         } else {
 958                 devinfo->use_streams = 1;
 959         }
 960 }
 961
 962 static void uas_free_streams(struct uas_dev_info *devinfo)
 963 {
 964         struct usb_device *udev = devinfo->udev;
 965         struct usb_host_endpoint *eps[3];
 966
 967         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 968         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 969         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 970         usb_free_streams(devinfo->intf, eps, 3, GFP_KERNEL);
 971 }
 972
 973 /*
 974  * XXX: What I'd like to do here is register a SCSI host for each USB host in
 975  * the system.  Follow usb-storage's design of registering a SCSI host for
 976  * each USB device for the moment.  Can implement this by walking up the
 977  * USB hierarchy until we find a USB host.
 978  */
 979 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 980 {
 981         int result = -ENOMEM;
 982         struct Scsi_Host *shost = NULL;
 983         struct uas_dev_info *devinfo;
 984         struct usb_device *udev = interface_to_usbdev(intf);
 985
 986         if (!uas_use_uas_driver(intf, id))
 987                 return -ENODEV;
 988
 989         if (uas_switch_interface(udev, intf))
 990                 return -ENODEV;
 991
 992         devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL);
 993         if (!devinfo)
 994                 goto set_alt0;
 995
 996         shost = scsi_host_alloc(&uas_host_template, sizeof(void *));
 997         if (!shost)
 998                 goto set_alt0;
 999
1000         shost->max_cmd_len = 16 + 252;
1001         shost->max_id = 1;
1002         shost->max_lun = 256;
1003         shost->max_channel = 0;
1004         shost->sg_tablesize = udev->bus->sg_tablesize;
1005
1006         devinfo->intf = intf;
1007         devinfo->udev = udev;
1008         devinfo->resetting = 0;
1009         init_usb_anchor(&devinfo->cmd_urbs);
1010         init_usb_anchor(&devinfo->sense_urbs);
1011         init_usb_anchor(&devinfo->data_urbs);
1012         spin_lock_init(&devinfo->lock);
1013         INIT_WORK(&devinfo->work, uas_do_work);
1014         INIT_LIST_HEAD(&devinfo->work_list);
1015         INIT_LIST_HEAD(&devinfo->dead_list);
1016         uas_configure_endpoints(devinfo);
1017
1018         result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2);
1019         if (result)
1020                 goto free_streams;
1021
1022         result = scsi_add_host(shost, &intf->dev);
1023         if (result)
1024                 goto free_streams;
1025
1026         shost->hostdata[0] = (unsigned long)devinfo;
1027
1028         scsi_scan_host(shost);
1029         usb_set_intfdata(intf, shost);
1030         return result;
1031
1032 free_streams:
1033         uas_free_streams(devinfo);
1034 set_alt0:
1035         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1036         kfree(devinfo);
1037         if (shost)
1038                 scsi_host_put(shost);
1039         return result;
1040 }
1041
1042 static int uas_pre_reset(struct usb_interface *intf)
1043 {
1044         struct Scsi_Host *shost = usb_get_intfdata(intf);
1045         struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
1046         unsigned long flags;
1047
1048         /* Block new requests */
1049         spin_lock_irqsave(shost->host_lock, flags);
1050         scsi_block_requests(shost);
1051         spin_unlock_irqrestore(shost->host_lock, flags);
1052
1053         /* Wait for any pending requests to complete */
1054         flush_work(&devinfo->work);
1055         if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000) == 0) {
1056                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1057                 return 1;
1058         }
1059
1060         uas_free_streams(devinfo);
1061
1062         return 0;
1063 }
1064
1065 static int uas_post_reset(struct usb_interface *intf)
1066 {
1067         struct Scsi_Host *shost = usb_get_intfdata(intf);
1068         struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
1069         unsigned long flags;
1070
1071         uas_configure_endpoints(devinfo);
1072
1073         spin_lock_irqsave(shost->host_lock, flags);
1074         scsi_report_bus_reset(shost, 0);
1075         spin_unlock_irqrestore(shost->host_lock, flags);
1076
1077         scsi_unblock_requests(shost);
1078
1079         return 0;
1080 }
1081
1082 static void uas_disconnect(struct usb_interface *intf)
1083 {
1084         struct Scsi_Host *shost = usb_get_intfdata(intf);
1085         struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
1086
1087         devinfo->resetting = 1;
1088         cancel_work_sync(&devinfo->work);
1089         uas_abort_work(devinfo);
1090         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1091         usb_kill_anchored_urbs(&devinfo->sense_urbs);
1092         usb_kill_anchored_urbs(&devinfo->data_urbs);
1093         uas_zap_dead(devinfo);
1094         scsi_remove_host(shost);
1095         uas_free_streams(devinfo);
1096         kfree(devinfo);
1097 }
1098
1099 static struct usb_driver uas_driver = {
1100         .name = "uas",
1101         .probe = uas_probe,
1102         .disconnect = uas_disconnect,
1103         .pre_reset = uas_pre_reset,
1104         .post_reset = uas_post_reset,
1105         .id_table = uas_usb_ids,
1106 };
1107
1108 module_usb_driver(uas_driver);
1109
1110 MODULE_LICENSE("GPL");
1111 MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp");