drivers/usb/storage/uas.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * USB Attached SCSI
   4  * Note that this is not the same as the USB Mass Storage driver
   5  *
   6  * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2016
   7  * Copyright Matthew Wilcox for Intel Corp, 2010
   8  * Copyright Sarah Sharp for Intel Corp, 2010
   9  */
  10
  11 #include <linux/blkdev.h>
  12 #include <linux/slab.h>
  13 #include <linux/types.h>
  14 #include <linux/module.h>
  15 #include <linux/usb.h>
  16 #include <linux/usb_usual.h>
  17 #include <linux/usb/hcd.h>
  18 #include <linux/usb/storage.h>
  19 #include <linux/usb/uas.h>
  20
  21 #include <scsi/scsi.h>
  22 #include <scsi/scsi_eh.h>
  23 #include <scsi/scsi_dbg.h>
  24 #include <scsi/scsi_cmnd.h>
  25 #include <scsi/scsi_device.h>
  26 #include <scsi/scsi_host.h>
  27 #include <scsi/scsi_tcq.h>
  28
  29 #include "uas-detect.h"
  30 #include "scsiglue.h"
  31
  32 #define MAX_CMNDS 256
  33
  34 struct uas_dev_info {
  35         struct usb_interface *intf;
  36         struct usb_device *udev;
  37         struct usb_anchor cmd_urbs;
  38         struct usb_anchor sense_urbs;
  39         struct usb_anchor data_urbs;
  40         unsigned long flags;
  41         int qdepth, resetting;
  42         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
  43         unsigned use_streams:1;
  44         unsigned shutdown:1;
  45         struct scsi_cmnd *cmnd[MAX_CMNDS];
  46         spinlock_t lock;
  47         struct work_struct work;
  48 };
  49
  50 enum {
  51         SUBMIT_STATUS_URB       = BIT(1),
  52         ALLOC_DATA_IN_URB       = BIT(2),
  53         SUBMIT_DATA_IN_URB      = BIT(3),
  54         ALLOC_DATA_OUT_URB      = BIT(4),
  55         SUBMIT_DATA_OUT_URB     = BIT(5),
  56         ALLOC_CMD_URB           = BIT(6),
  57         SUBMIT_CMD_URB          = BIT(7),
  58         COMMAND_INFLIGHT        = BIT(8),
  59         DATA_IN_URB_INFLIGHT    = BIT(9),
  60         DATA_OUT_URB_INFLIGHT   = BIT(10),
  61         COMMAND_ABORTED         = BIT(11),
  62         IS_IN_WORK_LIST         = BIT(12),
  63 };
  64
  65 /* Overrides scsi_pointer */
  66 struct uas_cmd_info {
  67         unsigned int state;
  68         unsigned int uas_tag;
  69         struct urb *cmd_urb;
  70         struct urb *data_in_urb;
  71         struct urb *data_out_urb;
  72 };
  73
  74 /* I hate forward declarations, but I actually have a loop */
  75 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
  76                                 struct uas_dev_info *devinfo);
  77 static void uas_do_work(struct work_struct *work);
  78 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
  79 static void uas_free_streams(struct uas_dev_info *devinfo);
  80 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
  81                                 int status);
  82
  83 static void uas_do_work(struct work_struct *work)
  84 {
  85         struct uas_dev_info *devinfo =
  86                 container_of(work, struct uas_dev_info, work);
  87         struct uas_cmd_info *cmdinfo;
  88         struct scsi_cmnd *cmnd;
  89         unsigned long flags;
  90         int i, err;
  91
  92         spin_lock_irqsave(&devinfo->lock, flags);
  93
  94         if (devinfo->resetting)
  95                 goto out;
  96
  97         for (i = 0; i < devinfo->qdepth; i++) {
  98                 if (!devinfo->cmnd[i])
  99                         continue;
 100
 101                 cmnd = devinfo->cmnd[i];
 102                 cmdinfo = (void *)&cmnd->SCp;
 103
 104                 if (!(cmdinfo->state & IS_IN_WORK_LIST))
 105                         continue;
 106
 107                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
 108                 if (!err)
 109                         cmdinfo->state &= ~IS_IN_WORK_LIST;
 110                 else
 111                         schedule_work(&devinfo->work);
 112         }
 113 out:
 114         spin_unlock_irqrestore(&devinfo->lock, flags);
 115 }
 116
 117 static void uas_add_work(struct uas_cmd_info *cmdinfo)
 118 {
 119         struct scsi_pointer *scp = (void *)cmdinfo;
 120         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 121         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 122
 123         lockdep_assert_held(&devinfo->lock);
 124         cmdinfo->state |= IS_IN_WORK_LIST;
 125         schedule_work(&devinfo->work);
 126 }
 127
 128 static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
 129 {
 130         struct uas_cmd_info *cmdinfo;
 131         struct scsi_cmnd *cmnd;
 132         unsigned long flags;
 133         int i, err;
 134
 135         spin_lock_irqsave(&devinfo->lock, flags);
 136         for (i = 0; i < devinfo->qdepth; i++) {
 137                 if (!devinfo->cmnd[i])
 138                         continue;
 139
 140                 cmnd = devinfo->cmnd[i];
 141                 cmdinfo = (void *)&cmnd->SCp;
 142                 uas_log_cmd_state(cmnd, __func__, 0);
 143                 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
 144                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 145                 cmnd->result = result << 16;
 146                 err = uas_try_complete(cmnd, __func__);
 147                 WARN_ON(err != 0);
 148         }
 149         spin_unlock_irqrestore(&devinfo->lock, flags);
 150 }
 151
 152 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
 153 {
 154         struct sense_iu *sense_iu = urb->transfer_buffer;
 155         struct scsi_device *sdev = cmnd->device;
 156
 157         if (urb->actual_length > 16) {
 158                 unsigned len = be16_to_cpup(&sense_iu->len);
 159                 if (len + 16 != urb->actual_length) {
 160                         int newlen = min(len + 16, urb->actual_length) - 16;
 161                         if (newlen < 0)
 162                                 newlen = 0;
 163                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 164                                 "disagrees with IU sense data length %d, "
 165                                 "using %d bytes of sense data\n", __func__,
 166                                         urb->actual_length, len, newlen);
 167                         len = newlen;
 168                 }
 169                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 170         }
 171
 172         cmnd->result = sense_iu->status;
 173 }
 174
 175 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
 176                               int status)
 177 {
 178         struct uas_cmd_info *ci = (void *)&cmnd->SCp;
 179         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 180
 181         scmd_printk(KERN_INFO, cmnd,
 182                     "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
 183                     prefix, status, cmdinfo->uas_tag,
 184                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
 185                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
 186                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
 187                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
 188                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
 189                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
 190                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
 191                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
 192                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
 193                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
 194                     (ci->state & COMMAND_ABORTED)       ? " abort" : "",
 195                     (ci->state & IS_IN_WORK_LIST)       ? " work"  : "");
 196         scsi_print_command(cmnd);
 197 }
 198
 199 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
 200 {
 201         struct uas_cmd_info *cmdinfo;
 202
 203         if (!cmnd)
 204                 return;
 205
 206         cmdinfo = (void *)&cmnd->SCp;
 207
 208         if (cmdinfo->state & SUBMIT_CMD_URB)
 209                 usb_free_urb(cmdinfo->cmd_urb);
 210
 211         /* data urbs may have never gotten their submit flag set */
 212         if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
 213                 usb_free_urb(cmdinfo->data_in_urb);
 214         if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
 215                 usb_free_urb(cmdinfo->data_out_urb);
 216 }
 217
 218 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 219 {
 220         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 221         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 222
 223         lockdep_assert_held(&devinfo->lock);
 224         if (cmdinfo->state & (COMMAND_INFLIGHT |
 225                               DATA_IN_URB_INFLIGHT |
 226                               DATA_OUT_URB_INFLIGHT |
 227                               COMMAND_ABORTED))
 228                 return -EBUSY;
 229         devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
 230         uas_free_unsubmitted_urbs(cmnd);
 231         cmnd->scsi_done(cmnd);
 232         return 0;
 233 }
 234
 235 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
 236                           unsigned direction)
 237 {
 238         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 239         int err;
 240
 241         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
 242         err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
 243         if (err) {
 244                 uas_add_work(cmdinfo);
 245         }
 246 }
 247
 248 static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
 249 {
 250         u8 response_code = riu->response_code;
 251
 252         switch (response_code) {
 253         case RC_INCORRECT_LUN:
 254                 cmnd->result = DID_BAD_TARGET << 16;
 255                 break;
 256         case RC_TMF_SUCCEEDED:
 257                 cmnd->result = DID_OK << 16;
 258                 break;
 259         case RC_TMF_NOT_SUPPORTED:
 260                 cmnd->result = DID_TARGET_FAILURE << 16;
 261                 break;
 262         default:
 263                 uas_log_cmd_state(cmnd, "response iu", response_code);
 264                 cmnd->result = DID_ERROR << 16;
 265                 break;
 266         }
 267
 268         return response_code == RC_TMF_SUCCEEDED;
 269 }
 270
 271 static void uas_stat_cmplt(struct urb *urb)
 272 {
 273         struct iu *iu = urb->transfer_buffer;
 274         struct Scsi_Host *shost = urb->context;
 275         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 276         struct urb *data_in_urb = NULL;
 277         struct urb *data_out_urb = NULL;
 278         struct scsi_cmnd *cmnd;
 279         struct uas_cmd_info *cmdinfo;
 280         unsigned long flags;
 281         unsigned int idx;
 282         int status = urb->status;
 283         bool success;
 284
 285         spin_lock_irqsave(&devinfo->lock, flags);
 286
 287         if (devinfo->resetting)
 288                 goto out;
 289
 290         if (status) {
 291                 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
 292                         dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
 293                 goto out;
 294         }
 295
 296         idx = be16_to_cpup(&iu->tag) - 1;
 297         if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
 298                 dev_err(&urb->dev->dev,
 299                         "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
 300                 goto out;
 301         }
 302
 303         cmnd = devinfo->cmnd[idx];
 304         cmdinfo = (void *)&cmnd->SCp;
 305
 306         if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
 307                 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
 308                 goto out;
 309         }
 310
 311         switch (iu->iu_id) {
 312         case IU_ID_STATUS:
 313                 uas_sense(urb, cmnd);
 314                 if (cmnd->result != 0) {
 315                         /* cancel data transfers on error */
 316                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 317                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 318                 }
 319                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 320                 uas_try_complete(cmnd, __func__);
 321                 break;
 322         case IU_ID_READ_READY:
 323                 if (!cmdinfo->data_in_urb ||
 324                                 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
 325                         uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
 326                         break;
 327                 }
 328                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
 329                 break;
 330         case IU_ID_WRITE_READY:
 331                 if (!cmdinfo->data_out_urb ||
 332                                 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
 333                         uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
 334                         break;
 335                 }
 336                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
 337                 break;
 338         case IU_ID_RESPONSE:
 339                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 340                 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
 341                 if (!success) {
 342                         /* Error, cancel data transfers */
 343                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 344                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 345                 }
 346                 uas_try_complete(cmnd, __func__);
 347                 break;
 348         default:
 349                 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
 350         }
 351 out:
 352         usb_free_urb(urb);
 353         spin_unlock_irqrestore(&devinfo->lock, flags);
 354
 355         /* Unlinking of data urbs must be done without holding the lock */
 356         if (data_in_urb) {
 357                 usb_unlink_urb(data_in_urb);
 358                 usb_put_urb(data_in_urb);
 359         }
 360         if (data_out_urb) {
 361                 usb_unlink_urb(data_out_urb);
 362                 usb_put_urb(data_out_urb);
 363         }
 364 }
 365
 366 static void uas_data_cmplt(struct urb *urb)
 367 {
 368         struct scsi_cmnd *cmnd = urb->context;
 369         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 370         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 371         struct scsi_data_buffer *sdb = &cmnd->sdb;
 372         unsigned long flags;
 373         int status = urb->status;
 374
 375         spin_lock_irqsave(&devinfo->lock, flags);
 376
 377         if (cmdinfo->data_in_urb == urb) {
 378                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
 379                 cmdinfo->data_in_urb = NULL;
 380         } else if (cmdinfo->data_out_urb == urb) {
 381                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
 382                 cmdinfo->data_out_urb = NULL;
 383         }
 384
 385         if (devinfo->resetting)
 386                 goto out;
 387
 388         /* Data urbs should not complete before the cmd urb is submitted */
 389         if (cmdinfo->state & SUBMIT_CMD_URB) {
 390                 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
 391                 goto out;
 392         }
 393
 394         if (status) {
 395                 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
 396                         uas_log_cmd_state(cmnd, "data cmplt err", status);
 397                 /* error: no data transfered */
 398                 sdb->resid = sdb->length;
 399         } else {
 400                 sdb->resid = sdb->length - urb->actual_length;
 401         }
 402         uas_try_complete(cmnd, __func__);
 403 out:
 404         usb_free_urb(urb);
 405         spin_unlock_irqrestore(&devinfo->lock, flags);
 406 }
 407
 408 static void uas_cmd_cmplt(struct urb *urb)
 409 {
 410         if (urb->status)
 411                 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
 412
 413         usb_free_urb(urb);
 414 }
 415
 416 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 417                                       struct scsi_cmnd *cmnd,
 418                                       enum dma_data_direction dir)
 419 {
 420         struct usb_device *udev = devinfo->udev;
 421         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 422         struct urb *urb = usb_alloc_urb(0, gfp);
 423         struct scsi_data_buffer *sdb = &cmnd->sdb;
 424         unsigned int pipe = (dir == DMA_FROM_DEVICE)
 425                 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
 426
 427         if (!urb)
 428                 goto out;
 429         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
 430                           uas_data_cmplt, cmnd);
 431         if (devinfo->use_streams)
 432                 urb->stream_id = cmdinfo->uas_tag;
 433         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
 434         urb->sg = sdb->table.sgl;
 435  out:
 436         return urb;
 437 }
 438
 439 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 440                                        struct scsi_cmnd *cmnd)
 441 {
 442         struct usb_device *udev = devinfo->udev;
 443         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 444         struct urb *urb = usb_alloc_urb(0, gfp);
 445         struct sense_iu *iu;
 446
 447         if (!urb)
 448                 goto out;
 449
 450         iu = kzalloc(sizeof(*iu), gfp);
 451         if (!iu)
 452                 goto free;
 453
 454         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
 455                           uas_stat_cmplt, cmnd->device->host);
 456         if (devinfo->use_streams)
 457                 urb->stream_id = cmdinfo->uas_tag;
 458         urb->transfer_flags |= URB_FREE_BUFFER;
 459  out:
 460         return urb;
 461  free:
 462         usb_free_urb(urb);
 463         return NULL;
 464 }
 465
 466 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 467                                         struct scsi_cmnd *cmnd)
 468 {
 469         struct usb_device *udev = devinfo->udev;
 470         struct scsi_device *sdev = cmnd->device;
 471         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 472         struct urb *urb = usb_alloc_urb(0, gfp);
 473         struct command_iu *iu;
 474         int len;
 475
 476         if (!urb)
 477                 goto out;
 478
 479         len = cmnd->cmd_len - 16;
 480         if (len < 0)
 481                 len = 0;
 482         len = ALIGN(len, 4);
 483         iu = kzalloc(sizeof(*iu) + len, gfp);
 484         if (!iu)
 485                 goto free;
 486
 487         iu->iu_id = IU_ID_COMMAND;
 488         iu->tag = cpu_to_be16(cmdinfo->uas_tag);
 489         iu->prio_attr = UAS_SIMPLE_TAG;
 490         iu->len = len;
 491         int_to_scsilun(sdev->lun, &iu->lun);
 492         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 493
 494         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
 495                                                         uas_cmd_cmplt, NULL);
 496         urb->transfer_flags |= URB_FREE_BUFFER;
 497  out:
 498         return urb;
 499  free:
 500         usb_free_urb(urb);
 501         return NULL;
 502 }
 503
 504 /*
 505  * Why should I request the Status IU before sending the Command IU?  Spec
 506  * says to, but also says the device may receive them in any order.  Seems
 507  * daft to me.
 508  */
 509
 510 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
 511 {
 512         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 513         struct urb *urb;
 514         int err;
 515
 516         urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
 517         if (!urb)
 518                 return NULL;
 519         usb_anchor_urb(urb, &devinfo->sense_urbs);
 520         err = usb_submit_urb(urb, gfp);
 521         if (err) {
 522                 usb_unanchor_urb(urb);
 523                 uas_log_cmd_state(cmnd, "sense submit err", err);
 524                 usb_free_urb(urb);
 525                 return NULL;
 526         }
 527         return urb;
 528 }
 529
 530 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 531                            struct uas_dev_info *devinfo)
 532 {
 533         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 534         struct urb *urb;
 535         int err;
 536
 537         lockdep_assert_held(&devinfo->lock);
 538         if (cmdinfo->state & SUBMIT_STATUS_URB) {
 539                 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
 540                 if (!urb)
 541                         return SCSI_MLQUEUE_DEVICE_BUSY;
 542                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
 543         }
 544
 545         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
 546                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
 547                                                         cmnd, DMA_FROM_DEVICE);
 548                 if (!cmdinfo->data_in_urb)
 549                         return SCSI_MLQUEUE_DEVICE_BUSY;
 550                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
 551         }
 552
 553         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
 554                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 555                 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
 556                 if (err) {
 557                         usb_unanchor_urb(cmdinfo->data_in_urb);
 558                         uas_log_cmd_state(cmnd, "data in submit err", err);
 559                         return SCSI_MLQUEUE_DEVICE_BUSY;
 560                 }
 561                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 562                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
 563         }
 564
 565         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
 566                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
 567                                                         cmnd, DMA_TO_DEVICE);
 568                 if (!cmdinfo->data_out_urb)
 569                         return SCSI_MLQUEUE_DEVICE_BUSY;
 570                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
 571         }
 572
 573         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
 574                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 575                 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
 576                 if (err) {
 577                         usb_unanchor_urb(cmdinfo->data_out_urb);
 578                         uas_log_cmd_state(cmnd, "data out submit err", err);
 579                         return SCSI_MLQUEUE_DEVICE_BUSY;
 580                 }
 581                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 582                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
 583         }
 584
 585         if (cmdinfo->state & ALLOC_CMD_URB) {
 586                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
 587                 if (!cmdinfo->cmd_urb)
 588                         return SCSI_MLQUEUE_DEVICE_BUSY;
 589                 cmdinfo->state &= ~ALLOC_CMD_URB;
 590         }
 591
 592         if (cmdinfo->state & SUBMIT_CMD_URB) {
 593                 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
 594                 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
 595                 if (err) {
 596                         usb_unanchor_urb(cmdinfo->cmd_urb);
 597                         uas_log_cmd_state(cmnd, "cmd submit err", err);
 598                         return SCSI_MLQUEUE_DEVICE_BUSY;
 599                 }
 600                 cmdinfo->cmd_urb = NULL;
 601                 cmdinfo->state &= ~SUBMIT_CMD_URB;
 602                 cmdinfo->state |= COMMAND_INFLIGHT;
 603         }
 604
 605         return 0;
 606 }
 607
 608 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
 609                                         void (*done)(struct scsi_cmnd *))
 610 {
 611         struct scsi_device *sdev = cmnd->device;
 612         struct uas_dev_info *devinfo = sdev->hostdata;
 613         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 614         unsigned long flags;
 615         int idx, err;
 616
 617         BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
 618
 619         /* Re-check scsi_block_requests now that we've the host-lock */
 620         if (cmnd->device->host->host_self_blocked)
 621                 return SCSI_MLQUEUE_DEVICE_BUSY;
 622
 623         if ((devinfo->flags & US_FL_NO_ATA_1X) &&
 624                         (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
 625                 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
 626                        sizeof(usb_stor_sense_invalidCDB));
 627                 cmnd->result = SAM_STAT_CHECK_CONDITION;
 628                 cmnd->scsi_done(cmnd);
 629                 return 0;
 630         }
 631
 632         spin_lock_irqsave(&devinfo->lock, flags);
 633
 634         if (devinfo->resetting) {
 635                 cmnd->result = DID_ERROR << 16;
 636                 cmnd->scsi_done(cmnd);
 637                 spin_unlock_irqrestore(&devinfo->lock, flags);
 638                 return 0;
 639         }
 640
 641         /* Find a free uas-tag */
 642         for (idx = 0; idx < devinfo->qdepth; idx++) {
 643                 if (!devinfo->cmnd[idx])
 644                         break;
 645         }
 646         if (idx == devinfo->qdepth) {
 647                 spin_unlock_irqrestore(&devinfo->lock, flags);
 648                 return SCSI_MLQUEUE_DEVICE_BUSY;
 649         }
 650
 651         cmnd->scsi_done = done;
 652
 653         memset(cmdinfo, 0, sizeof(*cmdinfo));
 654         cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
 655         cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
 656
 657         switch (cmnd->sc_data_direction) {
 658         case DMA_FROM_DEVICE:
 659                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 660                 break;
 661         case DMA_BIDIRECTIONAL:
 662                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 663                 /* fall through */
 664         case DMA_TO_DEVICE:
 665                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
 666         case DMA_NONE:
 667                 break;
 668         }
 669
 670         if (!devinfo->use_streams)
 671                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
 672
 673         err = uas_submit_urbs(cmnd, devinfo);
 674         if (err) {
 675                 /* If we did nothing, give up now */
 676                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
 677                         spin_unlock_irqrestore(&devinfo->lock, flags);
 678                         return SCSI_MLQUEUE_DEVICE_BUSY;
 679                 }
 680                 uas_add_work(cmdinfo);
 681         }
 682
 683         devinfo->cmnd[idx] = cmnd;
 684         spin_unlock_irqrestore(&devinfo->lock, flags);
 685         return 0;
 686 }
 687
 688 static DEF_SCSI_QCMD(uas_queuecommand)
 689
 690 /*
 691  * For now we do not support actually sending an abort to the device, so
 692  * this eh always fails. Still we must define it to make sure that we've
 693  * dropped all references to the cmnd in question once this function exits.
 694  */
 695 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
 696 {
 697         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 698         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 699         struct urb *data_in_urb = NULL;
 700         struct urb *data_out_urb = NULL;
 701         unsigned long flags;
 702
 703         spin_lock_irqsave(&devinfo->lock, flags);
 704
 705         uas_log_cmd_state(cmnd, __func__, 0);
 706
 707         /* Ensure that try_complete does not call scsi_done */
 708         cmdinfo->state |= COMMAND_ABORTED;
 709
 710         /* Drop all refs to this cmnd, kill data urbs to break their ref */
 711         devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
 712         if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
 713                 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 714         if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
 715                 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 716
 717         uas_free_unsubmitted_urbs(cmnd);
 718
 719         spin_unlock_irqrestore(&devinfo->lock, flags);
 720
 721         if (data_in_urb) {
 722                 usb_kill_urb(data_in_urb);
 723                 usb_put_urb(data_in_urb);
 724         }
 725         if (data_out_urb) {
 726                 usb_kill_urb(data_out_urb);
 727                 usb_put_urb(data_out_urb);
 728         }
 729
 730         return FAILED;
 731 }
 732
 733 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
 734 {
 735         struct scsi_device *sdev = cmnd->device;
 736         struct uas_dev_info *devinfo = sdev->hostdata;
 737         struct usb_device *udev = devinfo->udev;
 738         unsigned long flags;
 739         int err;
 740
 741         err = usb_lock_device_for_reset(udev, devinfo->intf);
 742         if (err) {
 743                 shost_printk(KERN_ERR, sdev->host,
 744                              "%s FAILED to get lock err %d\n", __func__, err);
 745                 return FAILED;
 746         }
 747
 748         shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
 749
 750         spin_lock_irqsave(&devinfo->lock, flags);
 751         devinfo->resetting = 1;
 752         spin_unlock_irqrestore(&devinfo->lock, flags);
 753
 754         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
 755         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 756         usb_kill_anchored_urbs(&devinfo->data_urbs);
 757         uas_zap_pending(devinfo, DID_RESET);
 758
 759         err = usb_reset_device(udev);
 760
 761         spin_lock_irqsave(&devinfo->lock, flags);
 762         devinfo->resetting = 0;
 763         spin_unlock_irqrestore(&devinfo->lock, flags);
 764
 765         usb_unlock_device(udev);
 766
 767         if (err) {
 768                 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
 769                              __func__, err);
 770                 return FAILED;
 771         }
 772
 773         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
 774         return SUCCESS;
 775 }
 776
 777 static int uas_target_alloc(struct scsi_target *starget)
 778 {
 779         struct uas_dev_info *devinfo = (struct uas_dev_info *)
 780                         dev_to_shost(starget->dev.parent)->hostdata;
 781
 782         if (devinfo->flags & US_FL_NO_REPORT_LUNS)
 783                 starget->no_report_luns = 1;
 784
 785         return 0;
 786 }
 787
 788 static int uas_slave_alloc(struct scsi_device *sdev)
 789 {
 790         struct uas_dev_info *devinfo =
 791                 (struct uas_dev_info *)sdev->host->hostdata;
 792
 793         sdev->hostdata = devinfo;
 794
 795         /*
 796          * USB has unusual DMA-alignment requirements: Although the
 797          * starting address of each scatter-gather element doesn't matter,
 798          * the length of each element except the last must be divisible
 799          * by the Bulk maxpacket value.  There's currently no way to
 800          * express this by block-layer constraints, so we'll cop out
 801          * and simply require addresses to be aligned at 512-byte
 802          * boundaries.  This is okay since most block I/O involves
 803          * hardware sectors that are multiples of 512 bytes in length,
 804          * and since host controllers up through USB 2.0 have maxpacket
 805          * values no larger than 512.
 806          *
 807          * But it doesn't suffice for Wireless USB, where Bulk maxpacket
 808          * values can be as large as 2048.  To make that work properly
 809          * will require changes to the block layer.
 810          */
 811         blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
 812
 813         if (devinfo->flags & US_FL_MAX_SECTORS_64)
 814                 blk_queue_max_hw_sectors(sdev->request_queue, 64);
 815         else if (devinfo->flags & US_FL_MAX_SECTORS_240)
 816                 blk_queue_max_hw_sectors(sdev->request_queue, 240);
 817
 818         return 0;
 819 }
 820
 821 static int uas_slave_configure(struct scsi_device *sdev)
 822 {
 823         struct uas_dev_info *devinfo = sdev->hostdata;
 824
 825         if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
 826                 sdev->no_report_opcodes = 1;
 827
 828         /* A few buggy USB-ATA bridges don't understand FUA */
 829         if (devinfo->flags & US_FL_BROKEN_FUA)
 830                 sdev->broken_fua = 1;
 831
 832         /* UAS also needs to support FL_ALWAYS_SYNC */
 833         if (devinfo->flags & US_FL_ALWAYS_SYNC) {
 834                 sdev->skip_ms_page_3f = 1;
 835                 sdev->skip_ms_page_8 = 1;
 836                 sdev->wce_default_on = 1;
 837         }
 838
 839         /*
 840          * Some disks return the total number of blocks in response
 841          * to READ CAPACITY rather than the highest block number.
 842          * If this device makes that mistake, tell the sd driver.
 843          */
 844         if (devinfo->flags & US_FL_FIX_CAPACITY)
 845                 sdev->fix_capacity = 1;
 846
 847         /*
 848          * Some devices don't like MODE SENSE with page=0x3f,
 849          * which is the command used for checking if a device
 850          * is write-protected.  Now that we tell the sd driver
 851          * to do a 192-byte transfer with this command the
 852          * majority of devices work fine, but a few still can't
 853          * handle it.  The sd driver will simply assume those
 854          * devices are write-enabled.
 855          */
 856         if (devinfo->flags & US_FL_NO_WP_DETECT)
 857                 sdev->skip_ms_page_3f = 1;
 858
 859         scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
 860         return 0;
 861 }
 862
 863 static struct scsi_host_template uas_host_template = {
 864         .module = THIS_MODULE,
 865         .name = "uas",
 866         .queuecommand = uas_queuecommand,
 867         .target_alloc = uas_target_alloc,
 868         .slave_alloc = uas_slave_alloc,
 869         .slave_configure = uas_slave_configure,
 870         .eh_abort_handler = uas_eh_abort_handler,
 871         .eh_device_reset_handler = uas_eh_device_reset_handler,
 872         .this_id = -1,
 873         .sg_tablesize = SG_NONE,
 874         .skip_settle_delay = 1,
 875         .dma_boundary = PAGE_SIZE - 1,
 876 };
 877
 878 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 879                     vendorName, productName, useProtocol, useTransport, \
 880                     initFunction, flags) \
 881 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
 882         .driver_info = (flags) }
 883
 884 static struct usb_device_id uas_usb_ids[] = {
 885 #       include "unusual_uas.h"
 886         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
 887         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
 888         { }
 889 };
 890 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
 891
 892 #undef UNUSUAL_DEV
 893
 894 static int uas_switch_interface(struct usb_device *udev,
 895                                 struct usb_interface *intf)
 896 {
 897         struct usb_host_interface *alt;
 898
 899         alt = uas_find_uas_alt_setting(intf);
 900         if (!alt)
 901                 return -ENODEV;
 902
 903         return usb_set_interface(udev, alt->desc.bInterfaceNumber,
 904                         alt->desc.bAlternateSetting);
 905 }
 906
 907 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
 908 {
 909         struct usb_host_endpoint *eps[4] = { };
 910         struct usb_device *udev = devinfo->udev;
 911         int r;
 912
 913         r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
 914         if (r)
 915                 return r;
 916
 917         devinfo->cmd_pipe = usb_sndbulkpipe(udev,
 918                                             usb_endpoint_num(&eps[0]->desc));
 919         devinfo->status_pipe = usb_rcvbulkpipe(udev,
 920                                             usb_endpoint_num(&eps[1]->desc));
 921         devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
 922                                             usb_endpoint_num(&eps[2]->desc));
 923         devinfo->data_out_pipe = usb_sndbulkpipe(udev,
 924                                             usb_endpoint_num(&eps[3]->desc));
 925
 926         if (udev->speed < USB_SPEED_SUPER) {
 927                 devinfo->qdepth = 32;
 928                 devinfo->use_streams = 0;
 929         } else {
 930                 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
 931                                                     3, MAX_CMNDS, GFP_NOIO);
 932                 if (devinfo->qdepth < 0)
 933                         return devinfo->qdepth;
 934                 devinfo->use_streams = 1;
 935         }
 936
 937         return 0;
 938 }
 939
 940 static void uas_free_streams(struct uas_dev_info *devinfo)
 941 {
 942         struct usb_device *udev = devinfo->udev;
 943         struct usb_host_endpoint *eps[3];
 944
 945         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 946         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 947         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 948         usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
 949 }
 950
 951 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 952 {
 953         int result = -ENOMEM;
 954         struct Scsi_Host *shost = NULL;
 955         struct uas_dev_info *devinfo;
 956         struct usb_device *udev = interface_to_usbdev(intf);
 957         unsigned long dev_flags;
 958
 959         if (!uas_use_uas_driver(intf, id, &dev_flags))
 960                 return -ENODEV;
 961
 962         if (uas_switch_interface(udev, intf))
 963                 return -ENODEV;
 964
 965         shost = scsi_host_alloc(&uas_host_template,
 966                                 sizeof(struct uas_dev_info));
 967         if (!shost)
 968                 goto set_alt0;
 969
 970         shost->max_cmd_len = 16 + 252;
 971         shost->max_id = 1;
 972         shost->max_lun = 256;
 973         shost->max_channel = 0;
 974         shost->sg_tablesize = udev->bus->sg_tablesize;
 975
 976         devinfo = (struct uas_dev_info *)shost->hostdata;
 977         devinfo->intf = intf;
 978         devinfo->udev = udev;
 979         devinfo->resetting = 0;
 980         devinfo->shutdown = 0;
 981         devinfo->flags = dev_flags;
 982         init_usb_anchor(&devinfo->cmd_urbs);
 983         init_usb_anchor(&devinfo->sense_urbs);
 984         init_usb_anchor(&devinfo->data_urbs);
 985         spin_lock_init(&devinfo->lock);
 986         INIT_WORK(&devinfo->work, uas_do_work);
 987
 988         result = uas_configure_endpoints(devinfo);
 989         if (result)
 990                 goto set_alt0;
 991
 992         /*
 993          * 1 tag is reserved for untagged commands +
 994          * 1 tag to avoid off by one errors in some bridge firmwares
 995          */
 996         shost->can_queue = devinfo->qdepth - 2;
 997
 998         usb_set_intfdata(intf, shost);
 999         result = scsi_add_host(shost, &intf->dev);
1000         if (result)
1001                 goto free_streams;
1002
1003         scsi_scan_host(shost);
1004         return result;
1005
1006 free_streams:
1007         uas_free_streams(devinfo);
1008         usb_set_intfdata(intf, NULL);
1009 set_alt0:
1010         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1011         if (shost)
1012                 scsi_host_put(shost);
1013         return result;
1014 }
1015
1016 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
1017 {
1018         unsigned long flags;
1019         int i, r = 1;
1020
1021         spin_lock_irqsave(&devinfo->lock, flags);
1022
1023         for (i = 0; i < devinfo->qdepth; i++) {
1024                 if (devinfo->cmnd[i]) {
1025                         r = 0; /* Not empty */
1026                         break;
1027                 }
1028         }
1029
1030         spin_unlock_irqrestore(&devinfo->lock, flags);
1031
1032         return r;
1033 }
1034
1035 /*
1036  * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1037  * get empty while there still is more work to do due to sense-urbs completing
1038  * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1039  */
1040 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1041 {
1042         unsigned long start_time;
1043         int r;
1044
1045         start_time = jiffies;
1046         do {
1047                 flush_work(&devinfo->work);
1048
1049                 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1050                 if (r == 0)
1051                         return -ETIME;
1052
1053                 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1054                 if (r == 0)
1055                         return -ETIME;
1056
1057                 if (time_after(jiffies, start_time + 5 * HZ))
1058                         return -ETIME;
1059         } while (!uas_cmnd_list_empty(devinfo));
1060
1061         return 0;
1062 }
1063
1064 static int uas_pre_reset(struct usb_interface *intf)
1065 {
1066         struct Scsi_Host *shost = usb_get_intfdata(intf);
1067         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1068         unsigned long flags;
1069
1070         if (devinfo->shutdown)
1071                 return 0;
1072
1073         /* Block new requests */
1074         spin_lock_irqsave(shost->host_lock, flags);
1075         scsi_block_requests(shost);
1076         spin_unlock_irqrestore(shost->host_lock, flags);
1077
1078         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1079                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1080                 scsi_unblock_requests(shost);
1081                 return 1;
1082         }
1083
1084         uas_free_streams(devinfo);
1085
1086         return 0;
1087 }
1088
1089 static int uas_post_reset(struct usb_interface *intf)
1090 {
1091         struct Scsi_Host *shost = usb_get_intfdata(intf);
1092         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1093         unsigned long flags;
1094         int err;
1095
1096         if (devinfo->shutdown)
1097                 return 0;
1098
1099         err = uas_configure_endpoints(devinfo);
1100         if (err && err != -ENODEV)
1101                 shost_printk(KERN_ERR, shost,
1102                              "%s: alloc streams error %d after reset",
1103                              __func__, err);
1104
1105         /* we must unblock the host in every case lest we deadlock */
1106         spin_lock_irqsave(shost->host_lock, flags);
1107         scsi_report_bus_reset(shost, 0);
1108         spin_unlock_irqrestore(shost->host_lock, flags);
1109
1110         scsi_unblock_requests(shost);
1111
1112         return err ? 1 : 0;
1113 }
1114
1115 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1116 {
1117         struct Scsi_Host *shost = usb_get_intfdata(intf);
1118         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1119
1120         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1121                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1122                 return -ETIME;
1123         }
1124
1125         return 0;
1126 }
1127
1128 static int uas_resume(struct usb_interface *intf)
1129 {
1130         return 0;
1131 }
1132
1133 static int uas_reset_resume(struct usb_interface *intf)
1134 {
1135         struct Scsi_Host *shost = usb_get_intfdata(intf);
1136         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1137         unsigned long flags;
1138         int err;
1139
1140         err = uas_configure_endpoints(devinfo);
1141         if (err) {
1142                 shost_printk(KERN_ERR, shost,
1143                              "%s: alloc streams error %d after reset",
1144                              __func__, err);
1145                 return -EIO;
1146         }
1147
1148         spin_lock_irqsave(shost->host_lock, flags);
1149         scsi_report_bus_reset(shost, 0);
1150         spin_unlock_irqrestore(shost->host_lock, flags);
1151
1152         return 0;
1153 }
1154
1155 static void uas_disconnect(struct usb_interface *intf)
1156 {
1157         struct Scsi_Host *shost = usb_get_intfdata(intf);
1158         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1159         unsigned long flags;
1160
1161         spin_lock_irqsave(&devinfo->lock, flags);
1162         devinfo->resetting = 1;
1163         spin_unlock_irqrestore(&devinfo->lock, flags);
1164
1165         cancel_work_sync(&devinfo->work);
1166         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1167         usb_kill_anchored_urbs(&devinfo->sense_urbs);
1168         usb_kill_anchored_urbs(&devinfo->data_urbs);
1169         uas_zap_pending(devinfo, DID_NO_CONNECT);
1170
1171         scsi_remove_host(shost);
1172         uas_free_streams(devinfo);
1173         scsi_host_put(shost);
1174 }
1175
1176 /*
1177  * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1178  * hang on reboot when the device is still in uas mode. Note the reset is
1179  * necessary as some devices won't revert to usb-storage mode without it.
1180  */
1181 static void uas_shutdown(struct device *dev)
1182 {
1183         struct usb_interface *intf = to_usb_interface(dev);
1184         struct usb_device *udev = interface_to_usbdev(intf);
1185         struct Scsi_Host *shost = usb_get_intfdata(intf);
1186         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1187
1188         if (system_state != SYSTEM_RESTART)
1189                 return;
1190
1191         devinfo->shutdown = 1;
1192         uas_free_streams(devinfo);
1193         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1194         usb_reset_device(udev);
1195 }
1196
1197 static struct usb_driver uas_driver = {
1198         .name = "uas",
1199         .probe = uas_probe,
1200         .disconnect = uas_disconnect,
1201         .pre_reset = uas_pre_reset,
1202         .post_reset = uas_post_reset,
1203         .suspend = uas_suspend,
1204         .resume = uas_resume,
1205         .reset_resume = uas_reset_resume,
1206         .drvwrap.driver.shutdown = uas_shutdown,
1207         .id_table = uas_usb_ids,
1208 };
1209
1210 module_usb_driver(uas_driver);
1211
1212 MODULE_LICENSE("GPL");
1213 MODULE_AUTHOR(
1214         "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");