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 Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2014
   6  * Copyright Matthew Wilcox for Intel Corp, 2010
   7  * Copyright Sarah Sharp for Intel Corp, 2010
   8  *
   9  * Distributed under the terms of the GNU GPL, version two.
  10  */
  11
  12 #include <linux/blkdev.h>
  13 #include <linux/slab.h>
  14 #include <linux/types.h>
  15 #include <linux/module.h>
  16 #include <linux/usb.h>
  17 #include <linux/usb_usual.h>
  18 #include <linux/usb/hcd.h>
  19 #include <linux/usb/storage.h>
  20 #include <linux/usb/uas.h>
  21
  22 #include <scsi/scsi.h>
  23 #include <scsi/scsi_eh.h>
  24 #include <scsi/scsi_dbg.h>
  25 #include <scsi/scsi_cmnd.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_tcq.h>
  29
  30 #include "uas-detect.h"
  31 #include "scsiglue.h"
  32
  33 #define MAX_CMNDS 256
  34
  35 /*
  36  * The r00-r01c specs define this version of the SENSE IU data structure.
  37  * It's still in use by several different firmware releases.
  38  */
  39 struct sense_iu_old {
  40         __u8 iu_id;
  41         __u8 rsvd1;
  42         __be16 tag;
  43         __be16 len;
  44         __u8 status;
  45         __u8 service_response;
  46         __u8 sense[SCSI_SENSE_BUFFERSIZE];
  47 };
  48
  49 struct uas_dev_info {
  50         struct usb_interface *intf;
  51         struct usb_device *udev;
  52         struct usb_anchor cmd_urbs;
  53         struct usb_anchor sense_urbs;
  54         struct usb_anchor data_urbs;
  55         unsigned long flags;
  56         int qdepth, resetting;
  57         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
  58         unsigned use_streams:1;
  59         unsigned uas_sense_old:1;
  60         unsigned shutdown:1;
  61         struct scsi_cmnd *cmnd[MAX_CMNDS];
  62         spinlock_t lock;
  63         struct work_struct work;
  64 };
  65
  66 enum {
  67         SUBMIT_STATUS_URB       = (1 << 1),
  68         ALLOC_DATA_IN_URB       = (1 << 2),
  69         SUBMIT_DATA_IN_URB      = (1 << 3),
  70         ALLOC_DATA_OUT_URB      = (1 << 4),
  71         SUBMIT_DATA_OUT_URB     = (1 << 5),
  72         ALLOC_CMD_URB           = (1 << 6),
  73         SUBMIT_CMD_URB          = (1 << 7),
  74         COMMAND_INFLIGHT        = (1 << 8),
  75         DATA_IN_URB_INFLIGHT    = (1 << 9),
  76         DATA_OUT_URB_INFLIGHT   = (1 << 10),
  77         COMMAND_ABORTED         = (1 << 11),
  78         IS_IN_WORK_LIST         = (1 << 12),
  79 };
  80
  81 /* Overrides scsi_pointer */
  82 struct uas_cmd_info {
  83         unsigned int state;
  84         unsigned int stream;
  85         struct urb *cmd_urb;
  86         struct urb *data_in_urb;
  87         struct urb *data_out_urb;
  88 };
  89
  90 /* I hate forward declarations, but I actually have a loop */
  91 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
  92                                 struct uas_dev_info *devinfo, gfp_t gfp);
  93 static void uas_do_work(struct work_struct *work);
  94 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
  95 static void uas_free_streams(struct uas_dev_info *devinfo);
  96 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller);
  97
  98 static void uas_do_work(struct work_struct *work)
  99 {
 100         struct uas_dev_info *devinfo =
 101                 container_of(work, struct uas_dev_info, work);
 102         struct uas_cmd_info *cmdinfo;
 103         struct scsi_cmnd *cmnd;
 104         unsigned long flags;
 105         int i, err;
 106
 107         spin_lock_irqsave(&devinfo->lock, flags);
 108
 109         if (devinfo->resetting)
 110                 goto out;
 111
 112         for (i = 0; i < devinfo->qdepth; i++) {
 113                 if (!devinfo->cmnd[i])
 114                         continue;
 115
 116                 cmnd = devinfo->cmnd[i];
 117                 cmdinfo = (void *)&cmnd->SCp;
 118
 119                 if (!(cmdinfo->state & IS_IN_WORK_LIST))
 120                         continue;
 121
 122                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 123                 if (!err)
 124                         cmdinfo->state &= ~IS_IN_WORK_LIST;
 125                 else
 126                         schedule_work(&devinfo->work);
 127         }
 128 out:
 129         spin_unlock_irqrestore(&devinfo->lock, flags);
 130 }
 131
 132 static void uas_add_work(struct uas_cmd_info *cmdinfo)
 133 {
 134         struct scsi_pointer *scp = (void *)cmdinfo;
 135         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 136         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 137
 138         lockdep_assert_held(&devinfo->lock);
 139         cmdinfo->state |= IS_IN_WORK_LIST;
 140         schedule_work(&devinfo->work);
 141 }
 142
 143 static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
 144 {
 145         struct uas_cmd_info *cmdinfo;
 146         struct scsi_cmnd *cmnd;
 147         unsigned long flags;
 148         int i, err;
 149
 150         spin_lock_irqsave(&devinfo->lock, flags);
 151         for (i = 0; i < devinfo->qdepth; i++) {
 152                 if (!devinfo->cmnd[i])
 153                         continue;
 154
 155                 cmnd = devinfo->cmnd[i];
 156                 cmdinfo = (void *)&cmnd->SCp;
 157                 uas_log_cmd_state(cmnd, __func__);
 158                 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
 159                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 160                 cmnd->result = result << 16;
 161                 err = uas_try_complete(cmnd, __func__);
 162                 WARN_ON(err != 0);
 163         }
 164         spin_unlock_irqrestore(&devinfo->lock, flags);
 165 }
 166
 167 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
 168 {
 169         struct sense_iu *sense_iu = urb->transfer_buffer;
 170         struct scsi_device *sdev = cmnd->device;
 171
 172         if (urb->actual_length > 16) {
 173                 unsigned len = be16_to_cpup(&sense_iu->len);
 174                 if (len + 16 != urb->actual_length) {
 175                         int newlen = min(len + 16, urb->actual_length) - 16;
 176                         if (newlen < 0)
 177                                 newlen = 0;
 178                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 179                                 "disagrees with IU sense data length %d, "
 180                                 "using %d bytes of sense data\n", __func__,
 181                                         urb->actual_length, len, newlen);
 182                         len = newlen;
 183                 }
 184                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 185         }
 186
 187         cmnd->result = sense_iu->status;
 188 }
 189
 190 static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
 191 {
 192         struct sense_iu_old *sense_iu = urb->transfer_buffer;
 193         struct scsi_device *sdev = cmnd->device;
 194
 195         if (urb->actual_length > 8) {
 196                 unsigned len = be16_to_cpup(&sense_iu->len) - 2;
 197                 if (len + 8 != urb->actual_length) {
 198                         int newlen = min(len + 8, urb->actual_length) - 8;
 199                         if (newlen < 0)
 200                                 newlen = 0;
 201                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 202                                 "disagrees with IU sense data length %d, "
 203                                 "using %d bytes of sense data\n", __func__,
 204                                         urb->actual_length, len, newlen);
 205                         len = newlen;
 206                 }
 207                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 208         }
 209
 210         cmnd->result = sense_iu->status;
 211 }
 212
 213 /*
 214  * scsi-tags go from 0 - (nr_tags - 1), uas tags need to match stream-ids,
 215  * which go from 1 - nr_streams. And we use 1 for untagged commands.
 216  */
 217 static int uas_get_tag(struct scsi_cmnd *cmnd)
 218 {
 219         int tag;
 220
 221         if (blk_rq_tagged(cmnd->request))
 222                 tag = cmnd->request->tag + 2;
 223         else
 224                 tag = 1;
 225
 226         return tag;
 227 }
 228
 229 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller)
 230 {
 231         struct uas_cmd_info *ci = (void *)&cmnd->SCp;
 232
 233         scmd_printk(KERN_INFO, cmnd,
 234                     "%s tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
 235                     caller, uas_get_tag(cmnd),
 236                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
 237                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
 238                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
 239                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
 240                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
 241                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
 242                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
 243                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
 244                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
 245                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
 246                     (ci->state & COMMAND_ABORTED)       ? " abort" : "",
 247                     (ci->state & IS_IN_WORK_LIST)       ? " work"  : "");
 248         scsi_print_command(cmnd);
 249 }
 250
 251 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
 252 {
 253         struct uas_cmd_info *cmdinfo;
 254
 255         if (!cmnd)
 256                 return;
 257
 258         cmdinfo = (void *)&cmnd->SCp;
 259
 260         if (cmdinfo->state & SUBMIT_CMD_URB)
 261                 usb_free_urb(cmdinfo->cmd_urb);
 262
 263         /* data urbs may have never gotten their submit flag set */
 264         if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
 265                 usb_free_urb(cmdinfo->data_in_urb);
 266         if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
 267                 usb_free_urb(cmdinfo->data_out_urb);
 268 }
 269
 270 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 271 {
 272         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 273         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 274
 275         lockdep_assert_held(&devinfo->lock);
 276         if (cmdinfo->state & (COMMAND_INFLIGHT |
 277                               DATA_IN_URB_INFLIGHT |
 278                               DATA_OUT_URB_INFLIGHT |
 279                               COMMAND_ABORTED))
 280                 return -EBUSY;
 281         devinfo->cmnd[uas_get_tag(cmnd) - 1] = NULL;
 282         uas_free_unsubmitted_urbs(cmnd);
 283         cmnd->scsi_done(cmnd);
 284         return 0;
 285 }
 286
 287 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
 288                           unsigned direction)
 289 {
 290         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 291         int err;
 292
 293         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
 294         err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 295         if (err) {
 296                 uas_add_work(cmdinfo);
 297         }
 298 }
 299
 300 static void uas_stat_cmplt(struct urb *urb)
 301 {
 302         struct iu *iu = urb->transfer_buffer;
 303         struct Scsi_Host *shost = urb->context;
 304         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 305         struct urb *data_in_urb = NULL;
 306         struct urb *data_out_urb = NULL;
 307         struct scsi_cmnd *cmnd;
 308         struct uas_cmd_info *cmdinfo;
 309         unsigned long flags;
 310         unsigned int idx;
 311
 312         spin_lock_irqsave(&devinfo->lock, flags);
 313
 314         if (devinfo->resetting)
 315                 goto out;
 316
 317         if (urb->status) {
 318                 if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
 319                         dev_err(&urb->dev->dev, "stat urb: status %d\n",
 320                                 urb->status);
 321                 }
 322                 goto out;
 323         }
 324
 325         idx = be16_to_cpup(&iu->tag) - 1;
 326         if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
 327                 dev_err(&urb->dev->dev,
 328                         "stat urb: no pending cmd for tag %d\n", idx + 1);
 329                 goto out;
 330         }
 331
 332         cmnd = devinfo->cmnd[idx];
 333         cmdinfo = (void *)&cmnd->SCp;
 334
 335         if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
 336                 scmd_printk(KERN_ERR, cmnd, "unexpected status cmplt\n");
 337                 goto out;
 338         }
 339
 340         switch (iu->iu_id) {
 341         case IU_ID_STATUS:
 342                 if (urb->actual_length < 16)
 343                         devinfo->uas_sense_old = 1;
 344                 if (devinfo->uas_sense_old)
 345                         uas_sense_old(urb, cmnd);
 346                 else
 347                         uas_sense(urb, cmnd);
 348                 if (cmnd->result != 0) {
 349                         /* cancel data transfers on error */
 350                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 351                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 352                 }
 353                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 354                 uas_try_complete(cmnd, __func__);
 355                 break;
 356         case IU_ID_READ_READY:
 357                 if (!cmdinfo->data_in_urb ||
 358                                 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
 359                         scmd_printk(KERN_ERR, cmnd, "unexpected read rdy\n");
 360                         break;
 361                 }
 362                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
 363                 break;
 364         case IU_ID_WRITE_READY:
 365                 if (!cmdinfo->data_out_urb ||
 366                                 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
 367                         scmd_printk(KERN_ERR, cmnd, "unexpected write rdy\n");
 368                         break;
 369                 }
 370                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
 371                 break;
 372         default:
 373                 scmd_printk(KERN_ERR, cmnd,
 374                         "Bogus IU (%d) received on status pipe\n", iu->iu_id);
 375         }
 376 out:
 377         usb_free_urb(urb);
 378         spin_unlock_irqrestore(&devinfo->lock, flags);
 379
 380         /* Unlinking of data urbs must be done without holding the lock */
 381         if (data_in_urb) {
 382                 usb_unlink_urb(data_in_urb);
 383                 usb_put_urb(data_in_urb);
 384         }
 385         if (data_out_urb) {
 386                 usb_unlink_urb(data_out_urb);
 387                 usb_put_urb(data_out_urb);
 388         }
 389 }
 390
 391 static void uas_data_cmplt(struct urb *urb)
 392 {
 393         struct scsi_cmnd *cmnd = urb->context;
 394         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 395         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 396         struct scsi_data_buffer *sdb = NULL;
 397         unsigned long flags;
 398
 399         spin_lock_irqsave(&devinfo->lock, flags);
 400
 401         if (cmdinfo->data_in_urb == urb) {
 402                 sdb = scsi_in(cmnd);
 403                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
 404                 cmdinfo->data_in_urb = NULL;
 405         } else if (cmdinfo->data_out_urb == urb) {
 406                 sdb = scsi_out(cmnd);
 407                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
 408                 cmdinfo->data_out_urb = NULL;
 409         }
 410         if (sdb == NULL) {
 411                 WARN_ON_ONCE(1);
 412                 goto out;
 413         }
 414
 415         if (devinfo->resetting)
 416                 goto out;
 417
 418         /* Data urbs should not complete before the cmd urb is submitted */
 419         if (cmdinfo->state & SUBMIT_CMD_URB) {
 420                 scmd_printk(KERN_ERR, cmnd, "unexpected data cmplt\n");
 421                 goto out;
 422         }
 423
 424         if (urb->status) {
 425                 if (urb->status != -ENOENT && urb->status != -ECONNRESET) {
 426                         uas_log_cmd_state(cmnd, __func__);
 427                         scmd_printk(KERN_ERR, cmnd,
 428                                 "data cmplt err %d stream %d\n",
 429                                 urb->status, urb->stream_id);
 430                 }
 431                 /* error: no data transfered */
 432                 sdb->resid = sdb->length;
 433         } else {
 434                 sdb->resid = sdb->length - urb->actual_length;
 435         }
 436         uas_try_complete(cmnd, __func__);
 437 out:
 438         usb_free_urb(urb);
 439         spin_unlock_irqrestore(&devinfo->lock, flags);
 440 }
 441
 442 static void uas_cmd_cmplt(struct urb *urb)
 443 {
 444         if (urb->status)
 445                 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
 446
 447         usb_free_urb(urb);
 448 }
 449
 450 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 451                                       unsigned int pipe, u16 stream_id,
 452                                       struct scsi_cmnd *cmnd,
 453                                       enum dma_data_direction dir)
 454 {
 455         struct usb_device *udev = devinfo->udev;
 456         struct urb *urb = usb_alloc_urb(0, gfp);
 457         struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
 458                 ? scsi_in(cmnd) : scsi_out(cmnd);
 459
 460         if (!urb)
 461                 goto out;
 462         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
 463                           uas_data_cmplt, cmnd);
 464         urb->stream_id = stream_id;
 465         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
 466         urb->sg = sdb->table.sgl;
 467  out:
 468         return urb;
 469 }
 470
 471 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 472                                        struct Scsi_Host *shost, u16 stream_id)
 473 {
 474         struct usb_device *udev = devinfo->udev;
 475         struct urb *urb = usb_alloc_urb(0, gfp);
 476         struct sense_iu *iu;
 477
 478         if (!urb)
 479                 goto out;
 480
 481         iu = kzalloc(sizeof(*iu), gfp);
 482         if (!iu)
 483                 goto free;
 484
 485         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
 486                                                 uas_stat_cmplt, shost);
 487         urb->stream_id = stream_id;
 488         urb->transfer_flags |= URB_FREE_BUFFER;
 489  out:
 490         return urb;
 491  free:
 492         usb_free_urb(urb);
 493         return NULL;
 494 }
 495
 496 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 497                                         struct scsi_cmnd *cmnd)
 498 {
 499         struct usb_device *udev = devinfo->udev;
 500         struct scsi_device *sdev = cmnd->device;
 501         struct urb *urb = usb_alloc_urb(0, gfp);
 502         struct command_iu *iu;
 503         int len;
 504
 505         if (!urb)
 506                 goto out;
 507
 508         len = cmnd->cmd_len - 16;
 509         if (len < 0)
 510                 len = 0;
 511         len = ALIGN(len, 4);
 512         iu = kzalloc(sizeof(*iu) + len, gfp);
 513         if (!iu)
 514                 goto free;
 515
 516         iu->iu_id = IU_ID_COMMAND;
 517         iu->tag = cpu_to_be16(uas_get_tag(cmnd));
 518         iu->prio_attr = UAS_SIMPLE_TAG;
 519         iu->len = len;
 520         int_to_scsilun(sdev->lun, &iu->lun);
 521         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 522
 523         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
 524                                                         uas_cmd_cmplt, NULL);
 525         urb->transfer_flags |= URB_FREE_BUFFER;
 526  out:
 527         return urb;
 528  free:
 529         usb_free_urb(urb);
 530         return NULL;
 531 }
 532
 533 /*
 534  * Why should I request the Status IU before sending the Command IU?  Spec
 535  * says to, but also says the device may receive them in any order.  Seems
 536  * daft to me.
 537  */
 538
 539 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd,
 540                                         gfp_t gfp, unsigned int stream)
 541 {
 542         struct Scsi_Host *shost = cmnd->device->host;
 543         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 544         struct urb *urb;
 545         int err;
 546
 547         urb = uas_alloc_sense_urb(devinfo, gfp, shost, stream);
 548         if (!urb)
 549                 return NULL;
 550         usb_anchor_urb(urb, &devinfo->sense_urbs);
 551         err = usb_submit_urb(urb, gfp);
 552         if (err) {
 553                 usb_unanchor_urb(urb);
 554                 uas_log_cmd_state(cmnd, __func__);
 555                 shost_printk(KERN_INFO, shost,
 556                              "sense urb submission error %d stream %d\n",
 557                              err, stream);
 558                 usb_free_urb(urb);
 559                 return NULL;
 560         }
 561         return urb;
 562 }
 563
 564 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 565                            struct uas_dev_info *devinfo, gfp_t gfp)
 566 {
 567         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 568         struct urb *urb;
 569         int err;
 570
 571         lockdep_assert_held(&devinfo->lock);
 572         if (cmdinfo->state & SUBMIT_STATUS_URB) {
 573                 urb = uas_submit_sense_urb(cmnd, gfp, cmdinfo->stream);
 574                 if (!urb)
 575                         return SCSI_MLQUEUE_DEVICE_BUSY;
 576                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
 577         }
 578
 579         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
 580                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
 581                                         devinfo->data_in_pipe, cmdinfo->stream,
 582                                         cmnd, DMA_FROM_DEVICE);
 583                 if (!cmdinfo->data_in_urb)
 584                         return SCSI_MLQUEUE_DEVICE_BUSY;
 585                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
 586         }
 587
 588         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
 589                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 590                 err = usb_submit_urb(cmdinfo->data_in_urb, gfp);
 591                 if (err) {
 592                         usb_unanchor_urb(cmdinfo->data_in_urb);
 593                         uas_log_cmd_state(cmnd, __func__);
 594                         scmd_printk(KERN_INFO, cmnd,
 595                                 "data in urb submission error %d stream %d\n",
 596                                 err, cmdinfo->data_in_urb->stream_id);
 597                         return SCSI_MLQUEUE_DEVICE_BUSY;
 598                 }
 599                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 600                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
 601         }
 602
 603         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
 604                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
 605                                         devinfo->data_out_pipe, cmdinfo->stream,
 606                                         cmnd, DMA_TO_DEVICE);
 607                 if (!cmdinfo->data_out_urb)
 608                         return SCSI_MLQUEUE_DEVICE_BUSY;
 609                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
 610         }
 611
 612         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
 613                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 614                 err = usb_submit_urb(cmdinfo->data_out_urb, gfp);
 615                 if (err) {
 616                         usb_unanchor_urb(cmdinfo->data_out_urb);
 617                         uas_log_cmd_state(cmnd, __func__);
 618                         scmd_printk(KERN_INFO, cmnd,
 619                                 "data out urb submission error %d stream %d\n",
 620                                 err, cmdinfo->data_out_urb->stream_id);
 621                         return SCSI_MLQUEUE_DEVICE_BUSY;
 622                 }
 623                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 624                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
 625         }
 626
 627         if (cmdinfo->state & ALLOC_CMD_URB) {
 628                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd);
 629                 if (!cmdinfo->cmd_urb)
 630                         return SCSI_MLQUEUE_DEVICE_BUSY;
 631                 cmdinfo->state &= ~ALLOC_CMD_URB;
 632         }
 633
 634         if (cmdinfo->state & SUBMIT_CMD_URB) {
 635                 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
 636                 err = usb_submit_urb(cmdinfo->cmd_urb, gfp);
 637                 if (err) {
 638                         usb_unanchor_urb(cmdinfo->cmd_urb);
 639                         uas_log_cmd_state(cmnd, __func__);
 640                         scmd_printk(KERN_INFO, cmnd,
 641                                     "cmd urb submission error %d\n", err);
 642                         return SCSI_MLQUEUE_DEVICE_BUSY;
 643                 }
 644                 cmdinfo->cmd_urb = NULL;
 645                 cmdinfo->state &= ~SUBMIT_CMD_URB;
 646                 cmdinfo->state |= COMMAND_INFLIGHT;
 647         }
 648
 649         return 0;
 650 }
 651
 652 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
 653                                         void (*done)(struct scsi_cmnd *))
 654 {
 655         struct scsi_device *sdev = cmnd->device;
 656         struct uas_dev_info *devinfo = sdev->hostdata;
 657         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 658         unsigned long flags;
 659         unsigned int stream;
 660         int err;
 661
 662         BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
 663
 664         /* Re-check scsi_block_requests now that we've the host-lock */
 665         if (cmnd->device->host->host_self_blocked)
 666                 return SCSI_MLQUEUE_DEVICE_BUSY;
 667
 668         if ((devinfo->flags & US_FL_NO_ATA_1X) &&
 669                         (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
 670                 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
 671                        sizeof(usb_stor_sense_invalidCDB));
 672                 cmnd->result = SAM_STAT_CHECK_CONDITION;
 673                 cmnd->scsi_done(cmnd);
 674                 return 0;
 675         }
 676
 677         spin_lock_irqsave(&devinfo->lock, flags);
 678
 679         if (devinfo->resetting) {
 680                 cmnd->result = DID_ERROR << 16;
 681                 cmnd->scsi_done(cmnd);
 682                 spin_unlock_irqrestore(&devinfo->lock, flags);
 683                 return 0;
 684         }
 685
 686         stream = uas_get_tag(cmnd);
 687         if (devinfo->cmnd[stream - 1]) {
 688                 spin_unlock_irqrestore(&devinfo->lock, flags);
 689                 return SCSI_MLQUEUE_DEVICE_BUSY;
 690         }
 691
 692         cmnd->scsi_done = done;
 693
 694         memset(cmdinfo, 0, sizeof(*cmdinfo));
 695         cmdinfo->stream = stream;
 696         cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
 697
 698         switch (cmnd->sc_data_direction) {
 699         case DMA_FROM_DEVICE:
 700                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 701                 break;
 702         case DMA_BIDIRECTIONAL:
 703                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 704         case DMA_TO_DEVICE:
 705                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
 706         case DMA_NONE:
 707                 break;
 708         }
 709
 710         if (!devinfo->use_streams) {
 711                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
 712                 cmdinfo->stream = 0;
 713         }
 714
 715         err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
 716         if (err) {
 717                 /* If we did nothing, give up now */
 718                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
 719                         spin_unlock_irqrestore(&devinfo->lock, flags);
 720                         return SCSI_MLQUEUE_DEVICE_BUSY;
 721                 }
 722                 uas_add_work(cmdinfo);
 723         }
 724
 725         devinfo->cmnd[stream - 1] = cmnd;
 726         spin_unlock_irqrestore(&devinfo->lock, flags);
 727         return 0;
 728 }
 729
 730 static DEF_SCSI_QCMD(uas_queuecommand)
 731
 732 /*
 733  * For now we do not support actually sending an abort to the device, so
 734  * this eh always fails. Still we must define it to make sure that we've
 735  * dropped all references to the cmnd in question once this function exits.
 736  */
 737 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
 738 {
 739         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 740         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 741         struct urb *data_in_urb = NULL;
 742         struct urb *data_out_urb = NULL;
 743         unsigned long flags;
 744
 745         spin_lock_irqsave(&devinfo->lock, flags);
 746
 747         uas_log_cmd_state(cmnd, __func__);
 748
 749         /* Ensure that try_complete does not call scsi_done */
 750         cmdinfo->state |= COMMAND_ABORTED;
 751
 752         /* Drop all refs to this cmnd, kill data urbs to break their ref */
 753         devinfo->cmnd[uas_get_tag(cmnd) - 1] = NULL;
 754         if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
 755                 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 756         if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
 757                 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 758
 759         uas_free_unsubmitted_urbs(cmnd);
 760
 761         spin_unlock_irqrestore(&devinfo->lock, flags);
 762
 763         if (data_in_urb) {
 764                 usb_kill_urb(data_in_urb);
 765                 usb_put_urb(data_in_urb);
 766         }
 767         if (data_out_urb) {
 768                 usb_kill_urb(data_out_urb);
 769                 usb_put_urb(data_out_urb);
 770         }
 771
 772         return FAILED;
 773 }
 774
 775 static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
 776 {
 777         struct scsi_device *sdev = cmnd->device;
 778         struct uas_dev_info *devinfo = sdev->hostdata;
 779         struct usb_device *udev = devinfo->udev;
 780         unsigned long flags;
 781         int err;
 782
 783         err = usb_lock_device_for_reset(udev, devinfo->intf);
 784         if (err) {
 785                 shost_printk(KERN_ERR, sdev->host,
 786                              "%s FAILED to get lock err %d\n", __func__, err);
 787                 return FAILED;
 788         }
 789
 790         shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
 791
 792         spin_lock_irqsave(&devinfo->lock, flags);
 793         devinfo->resetting = 1;
 794         spin_unlock_irqrestore(&devinfo->lock, flags);
 795
 796         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
 797         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 798         usb_kill_anchored_urbs(&devinfo->data_urbs);
 799         uas_zap_pending(devinfo, DID_RESET);
 800
 801         err = usb_reset_device(udev);
 802
 803         spin_lock_irqsave(&devinfo->lock, flags);
 804         devinfo->resetting = 0;
 805         spin_unlock_irqrestore(&devinfo->lock, flags);
 806
 807         usb_unlock_device(udev);
 808
 809         if (err) {
 810                 shost_printk(KERN_INFO, sdev->host, "%s FAILED\n", __func__);
 811                 return FAILED;
 812         }
 813
 814         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
 815         return SUCCESS;
 816 }
 817
 818 static int uas_slave_alloc(struct scsi_device *sdev)
 819 {
 820         sdev->hostdata = (void *)sdev->host->hostdata;
 821
 822         /* USB has unusual DMA-alignment requirements: Although the
 823          * starting address of each scatter-gather element doesn't matter,
 824          * the length of each element except the last must be divisible
 825          * by the Bulk maxpacket value.  There's currently no way to
 826          * express this by block-layer constraints, so we'll cop out
 827          * and simply require addresses to be aligned at 512-byte
 828          * boundaries.  This is okay since most block I/O involves
 829          * hardware sectors that are multiples of 512 bytes in length,
 830          * and since host controllers up through USB 2.0 have maxpacket
 831          * values no larger than 512.
 832          *
 833          * But it doesn't suffice for Wireless USB, where Bulk maxpacket
 834          * values can be as large as 2048.  To make that work properly
 835          * will require changes to the block layer.
 836          */
 837         blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
 838
 839         return 0;
 840 }
 841
 842 static int uas_slave_configure(struct scsi_device *sdev)
 843 {
 844         struct uas_dev_info *devinfo = sdev->hostdata;
 845
 846         if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
 847                 sdev->no_report_opcodes = 1;
 848
 849         scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
 850         scsi_activate_tcq(sdev, devinfo->qdepth - 2);
 851         return 0;
 852 }
 853
 854 static struct scsi_host_template uas_host_template = {
 855         .module = THIS_MODULE,
 856         .name = "uas",
 857         .queuecommand = uas_queuecommand,
 858         .slave_alloc = uas_slave_alloc,
 859         .slave_configure = uas_slave_configure,
 860         .eh_abort_handler = uas_eh_abort_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 int uas_configure_endpoints(struct uas_dev_info *devinfo)
 902 {
 903         struct usb_host_endpoint *eps[4] = { };
 904         struct usb_device *udev = devinfo->udev;
 905         int r;
 906
 907         devinfo->uas_sense_old = 0;
 908
 909         r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
 910         if (r)
 911                 return r;
 912
 913         devinfo->cmd_pipe = usb_sndbulkpipe(udev,
 914                                             usb_endpoint_num(&eps[0]->desc));
 915         devinfo->status_pipe = usb_rcvbulkpipe(udev,
 916                                             usb_endpoint_num(&eps[1]->desc));
 917         devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
 918                                             usb_endpoint_num(&eps[2]->desc));
 919         devinfo->data_out_pipe = usb_sndbulkpipe(udev,
 920                                             usb_endpoint_num(&eps[3]->desc));
 921
 922         if (udev->speed < USB_SPEED_SUPER) {
 923                 devinfo->qdepth = 32;
 924                 devinfo->use_streams = 0;
 925         } else {
 926                 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
 927                                                     3, MAX_CMNDS, GFP_NOIO);
 928                 if (devinfo->qdepth < 0)
 929                         return devinfo->qdepth;
 930                 devinfo->use_streams = 1;
 931         }
 932
 933         return 0;
 934 }
 935
 936 static void uas_free_streams(struct uas_dev_info *devinfo)
 937 {
 938         struct usb_device *udev = devinfo->udev;
 939         struct usb_host_endpoint *eps[3];
 940
 941         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 942         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 943         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 944         usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
 945 }
 946
 947 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 948 {
 949         int result = -ENOMEM;
 950         struct Scsi_Host *shost = NULL;
 951         struct uas_dev_info *devinfo;
 952         struct usb_device *udev = interface_to_usbdev(intf);
 953
 954         if (!uas_use_uas_driver(intf, id))
 955                 return -ENODEV;
 956
 957         if (uas_switch_interface(udev, intf))
 958                 return -ENODEV;
 959
 960         shost = scsi_host_alloc(&uas_host_template,
 961                                 sizeof(struct uas_dev_info));
 962         if (!shost)
 963                 goto set_alt0;
 964
 965         shost->max_cmd_len = 16 + 252;
 966         shost->max_id = 1;
 967         shost->max_lun = 256;
 968         shost->max_channel = 0;
 969         shost->sg_tablesize = udev->bus->sg_tablesize;
 970
 971         devinfo = (struct uas_dev_info *)shost->hostdata;
 972         devinfo->intf = intf;
 973         devinfo->udev = udev;
 974         devinfo->resetting = 0;
 975         devinfo->shutdown = 0;
 976         devinfo->flags = id->driver_info;
 977         usb_stor_adjust_quirks(udev, &devinfo->flags);
 978         init_usb_anchor(&devinfo->cmd_urbs);
 979         init_usb_anchor(&devinfo->sense_urbs);
 980         init_usb_anchor(&devinfo->data_urbs);
 981         spin_lock_init(&devinfo->lock);
 982         INIT_WORK(&devinfo->work, uas_do_work);
 983
 984         result = uas_configure_endpoints(devinfo);
 985         if (result)
 986                 goto set_alt0;
 987
 988         result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2);
 989         if (result)
 990                 goto free_streams;
 991
 992         usb_set_intfdata(intf, shost);
 993         result = scsi_add_host(shost, &intf->dev);
 994         if (result)
 995                 goto free_streams;
 996
 997         scsi_scan_host(shost);
 998         return result;
 999
1000 free_streams:
1001         uas_free_streams(devinfo);
1002         usb_set_intfdata(intf, NULL);
1003 set_alt0:
1004         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1005         if (shost)
1006                 scsi_host_put(shost);
1007         return result;
1008 }
1009
1010 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
1011 {
1012         unsigned long flags;
1013         int i, r = 1;
1014
1015         spin_lock_irqsave(&devinfo->lock, flags);
1016
1017         for (i = 0; i < devinfo->qdepth; i++) {
1018                 if (devinfo->cmnd[i]) {
1019                         r = 0; /* Not empty */
1020                         break;
1021                 }
1022         }
1023
1024         spin_unlock_irqrestore(&devinfo->lock, flags);
1025
1026         return r;
1027 }
1028
1029 /*
1030  * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1031  * get empty while there still is more work to do due to sense-urbs completing
1032  * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1033  */
1034 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1035 {
1036         unsigned long start_time;
1037         int r;
1038
1039         start_time = jiffies;
1040         do {
1041                 flush_work(&devinfo->work);
1042
1043                 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1044                 if (r == 0)
1045                         return -ETIME;
1046
1047                 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1048                 if (r == 0)
1049                         return -ETIME;
1050
1051                 if (time_after(jiffies, start_time + 5 * HZ))
1052                         return -ETIME;
1053         } while (!uas_cmnd_list_empty(devinfo));
1054
1055         return 0;
1056 }
1057
1058 static int uas_pre_reset(struct usb_interface *intf)
1059 {
1060         struct Scsi_Host *shost = usb_get_intfdata(intf);
1061         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1062         unsigned long flags;
1063
1064         if (devinfo->shutdown)
1065                 return 0;
1066
1067         /* Block new requests */
1068         spin_lock_irqsave(shost->host_lock, flags);
1069         scsi_block_requests(shost);
1070         spin_unlock_irqrestore(shost->host_lock, flags);
1071
1072         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1073                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1074                 scsi_unblock_requests(shost);
1075                 return 1;
1076         }
1077
1078         uas_free_streams(devinfo);
1079
1080         return 0;
1081 }
1082
1083 static int uas_post_reset(struct usb_interface *intf)
1084 {
1085         struct Scsi_Host *shost = usb_get_intfdata(intf);
1086         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1087         unsigned long flags;
1088
1089         if (devinfo->shutdown)
1090                 return 0;
1091
1092         if (uas_configure_endpoints(devinfo) != 0) {
1093                 shost_printk(KERN_ERR, shost,
1094                              "%s: alloc streams error after reset", __func__);
1095                 return 1;
1096         }
1097
1098         spin_lock_irqsave(shost->host_lock, flags);
1099         scsi_report_bus_reset(shost, 0);
1100         spin_unlock_irqrestore(shost->host_lock, flags);
1101
1102         scsi_unblock_requests(shost);
1103
1104         return 0;
1105 }
1106
1107 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1108 {
1109         struct Scsi_Host *shost = usb_get_intfdata(intf);
1110         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1111
1112         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1113                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1114                 return -ETIME;
1115         }
1116
1117         return 0;
1118 }
1119
1120 static int uas_resume(struct usb_interface *intf)
1121 {
1122         return 0;
1123 }
1124
1125 static int uas_reset_resume(struct usb_interface *intf)
1126 {
1127         struct Scsi_Host *shost = usb_get_intfdata(intf);
1128         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1129         unsigned long flags;
1130
1131         if (uas_configure_endpoints(devinfo) != 0) {
1132                 shost_printk(KERN_ERR, shost,
1133                              "%s: alloc streams error after reset", __func__);
1134                 return -EIO;
1135         }
1136
1137         spin_lock_irqsave(shost->host_lock, flags);
1138         scsi_report_bus_reset(shost, 0);
1139         spin_unlock_irqrestore(shost->host_lock, flags);
1140
1141         return 0;
1142 }
1143
1144 static void uas_disconnect(struct usb_interface *intf)
1145 {
1146         struct Scsi_Host *shost = usb_get_intfdata(intf);
1147         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1148         unsigned long flags;
1149
1150         spin_lock_irqsave(&devinfo->lock, flags);
1151         devinfo->resetting = 1;
1152         spin_unlock_irqrestore(&devinfo->lock, flags);
1153
1154         cancel_work_sync(&devinfo->work);
1155         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1156         usb_kill_anchored_urbs(&devinfo->sense_urbs);
1157         usb_kill_anchored_urbs(&devinfo->data_urbs);
1158         uas_zap_pending(devinfo, DID_NO_CONNECT);
1159
1160         scsi_remove_host(shost);
1161         uas_free_streams(devinfo);
1162         scsi_host_put(shost);
1163 }
1164
1165 /*
1166  * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1167  * hang on reboot when the device is still in uas mode. Note the reset is
1168  * necessary as some devices won't revert to usb-storage mode without it.
1169  */
1170 static void uas_shutdown(struct device *dev)
1171 {
1172         struct usb_interface *intf = to_usb_interface(dev);
1173         struct usb_device *udev = interface_to_usbdev(intf);
1174         struct Scsi_Host *shost = usb_get_intfdata(intf);
1175         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1176
1177         if (system_state != SYSTEM_RESTART)
1178                 return;
1179
1180         devinfo->shutdown = 1;
1181         uas_free_streams(devinfo);
1182         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1183         usb_reset_device(udev);
1184 }
1185
1186 static struct usb_driver uas_driver = {
1187         .name = "uas",
1188         .probe = uas_probe,
1189         .disconnect = uas_disconnect,
1190         .pre_reset = uas_pre_reset,
1191         .post_reset = uas_post_reset,
1192         .suspend = uas_suspend,
1193         .resume = uas_resume,
1194         .reset_resume = uas_reset_resume,
1195         .drvwrap.driver.shutdown = uas_shutdown,
1196         .id_table = uas_usb_ids,
1197 };
1198
1199 module_usb_driver(uas_driver);
1200
1201 MODULE_LICENSE("GPL");
1202 MODULE_AUTHOR(
1203         "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");