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 /*
  34  * The r00-r01c specs define this version of the SENSE IU data structure.
  35  * It's still in use by several different firmware releases.
  36  */
  37 struct sense_iu_old {
  38         __u8 iu_id;
  39         __u8 rsvd1;
  40         __be16 tag;
  41         __be16 len;
  42         __u8 status;
  43         __u8 service_response;
  44         __u8 sense[SCSI_SENSE_BUFFERSIZE];
  45 };
  46
  47 struct uas_dev_info {
  48         struct usb_interface *intf;
  49         struct usb_device *udev;
  50         struct usb_anchor cmd_urbs;
  51         struct usb_anchor sense_urbs;
  52         struct usb_anchor data_urbs;
  53         unsigned long flags;
  54         int qdepth, resetting;
  55         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
  56         unsigned use_streams:1;
  57         unsigned uas_sense_old:1;
  58         unsigned shutdown:1;
  59         struct scsi_cmnd *cmnd;
  60         spinlock_t lock;
  61         struct work_struct work;
  62         struct list_head inflight_list;
  63         struct list_head dead_list;
  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_COMPLETED       = (1 << 11),
  78         COMMAND_ABORTED         = (1 << 12),
  79         UNLINK_DATA_URBS        = (1 << 13),
  80         IS_IN_WORK_LIST         = (1 << 14),
  81 };
  82
  83 /* Overrides scsi_pointer */
  84 struct uas_cmd_info {
  85         unsigned int state;
  86         unsigned int stream;
  87         struct urb *cmd_urb;
  88         struct urb *data_in_urb;
  89         struct urb *data_out_urb;
  90         struct list_head list;
  91 };
  92
  93 /* I hate forward declarations, but I actually have a loop */
  94 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
  95                                 struct uas_dev_info *devinfo, gfp_t gfp);
  96 static void uas_do_work(struct work_struct *work);
  97 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
  98 static void uas_free_streams(struct uas_dev_info *devinfo);
  99 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller);
 100
 101 /* Must be called with devinfo->lock held, will temporary unlock the lock */
 102 static void uas_unlink_data_urbs(struct uas_dev_info *devinfo,
 103                                  struct uas_cmd_info *cmdinfo,
 104                                  unsigned long *lock_flags)
 105 {
 106         /*
 107          * The UNLINK_DATA_URBS flag makes sure uas_try_complete
 108          * (called by urb completion) doesn't release cmdinfo
 109          * underneath us.
 110          */
 111         cmdinfo->state |= UNLINK_DATA_URBS;
 112         spin_unlock_irqrestore(&devinfo->lock, *lock_flags);
 113
 114         if (cmdinfo->data_in_urb)
 115                 usb_unlink_urb(cmdinfo->data_in_urb);
 116         if (cmdinfo->data_out_urb)
 117                 usb_unlink_urb(cmdinfo->data_out_urb);
 118
 119         spin_lock_irqsave(&devinfo->lock, *lock_flags);
 120         cmdinfo->state &= ~UNLINK_DATA_URBS;
 121 }
 122
 123 static void uas_do_work(struct work_struct *work)
 124 {
 125         struct uas_dev_info *devinfo =
 126                 container_of(work, struct uas_dev_info, work);
 127         struct uas_cmd_info *cmdinfo;
 128         unsigned long flags;
 129         int err;
 130
 131         spin_lock_irqsave(&devinfo->lock, flags);
 132
 133         if (devinfo->resetting)
 134                 goto out;
 135
 136         list_for_each_entry(cmdinfo, &devinfo->inflight_list, list) {
 137                 struct scsi_pointer *scp = (void *)cmdinfo;
 138                 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd,
 139                                                       SCp);
 140
 141                 if (!(cmdinfo->state & IS_IN_WORK_LIST))
 142                         continue;
 143
 144                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 145                 if (!err)
 146                         cmdinfo->state &= ~IS_IN_WORK_LIST;
 147                 else
 148                         schedule_work(&devinfo->work);
 149         }
 150 out:
 151         spin_unlock_irqrestore(&devinfo->lock, flags);
 152 }
 153
 154 static void uas_mark_cmd_dead(struct uas_dev_info *devinfo,
 155                               struct uas_cmd_info *cmdinfo,
 156                               int result, const char *caller)
 157 {
 158         struct scsi_pointer *scp = (void *)cmdinfo;
 159         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 160
 161         uas_log_cmd_state(cmnd, caller);
 162         lockdep_assert_held(&devinfo->lock);
 163         WARN_ON_ONCE(cmdinfo->state & COMMAND_ABORTED);
 164         cmdinfo->state |= COMMAND_ABORTED;
 165         cmdinfo->state &= ~IS_IN_WORK_LIST;
 166         cmnd->result = result << 16;
 167         list_move_tail(&cmdinfo->list, &devinfo->dead_list);
 168 }
 169
 170 static void uas_abort_inflight(struct uas_dev_info *devinfo, int result,
 171                                const char *caller)
 172 {
 173         struct uas_cmd_info *cmdinfo;
 174         struct uas_cmd_info *temp;
 175         unsigned long flags;
 176
 177         spin_lock_irqsave(&devinfo->lock, flags);
 178         list_for_each_entry_safe(cmdinfo, temp, &devinfo->inflight_list, list)
 179                 uas_mark_cmd_dead(devinfo, cmdinfo, result, caller);
 180         spin_unlock_irqrestore(&devinfo->lock, flags);
 181 }
 182
 183 static void uas_add_work(struct uas_cmd_info *cmdinfo)
 184 {
 185         struct scsi_pointer *scp = (void *)cmdinfo;
 186         struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
 187         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 188
 189         lockdep_assert_held(&devinfo->lock);
 190         cmdinfo->state |= IS_IN_WORK_LIST;
 191         schedule_work(&devinfo->work);
 192 }
 193
 194 static void uas_zap_dead(struct uas_dev_info *devinfo)
 195 {
 196         struct uas_cmd_info *cmdinfo;
 197         struct uas_cmd_info *temp;
 198         unsigned long flags;
 199
 200         spin_lock_irqsave(&devinfo->lock, flags);
 201         list_for_each_entry_safe(cmdinfo, temp, &devinfo->dead_list, list) {
 202                 struct scsi_pointer *scp = (void *)cmdinfo;
 203                 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd,
 204                                                       SCp);
 205                 uas_log_cmd_state(cmnd, __func__);
 206                 WARN_ON_ONCE(!(cmdinfo->state & COMMAND_ABORTED));
 207                 /* all urbs are killed, clear inflight bits */
 208                 cmdinfo->state &= ~(COMMAND_INFLIGHT |
 209                                     DATA_IN_URB_INFLIGHT |
 210                                     DATA_OUT_URB_INFLIGHT);
 211                 uas_try_complete(cmnd, __func__);
 212         }
 213         spin_unlock_irqrestore(&devinfo->lock, flags);
 214 }
 215
 216 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
 217 {
 218         struct sense_iu *sense_iu = urb->transfer_buffer;
 219         struct scsi_device *sdev = cmnd->device;
 220
 221         if (urb->actual_length > 16) {
 222                 unsigned len = be16_to_cpup(&sense_iu->len);
 223                 if (len + 16 != urb->actual_length) {
 224                         int newlen = min(len + 16, urb->actual_length) - 16;
 225                         if (newlen < 0)
 226                                 newlen = 0;
 227                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 228                                 "disagrees with IU sense data length %d, "
 229                                 "using %d bytes of sense data\n", __func__,
 230                                         urb->actual_length, len, newlen);
 231                         len = newlen;
 232                 }
 233                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 234         }
 235
 236         cmnd->result = sense_iu->status;
 237 }
 238
 239 static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
 240 {
 241         struct sense_iu_old *sense_iu = urb->transfer_buffer;
 242         struct scsi_device *sdev = cmnd->device;
 243
 244         if (urb->actual_length > 8) {
 245                 unsigned len = be16_to_cpup(&sense_iu->len) - 2;
 246                 if (len + 8 != urb->actual_length) {
 247                         int newlen = min(len + 8, urb->actual_length) - 8;
 248                         if (newlen < 0)
 249                                 newlen = 0;
 250                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 251                                 "disagrees with IU sense data length %d, "
 252                                 "using %d bytes of sense data\n", __func__,
 253                                         urb->actual_length, len, newlen);
 254                         len = newlen;
 255                 }
 256                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 257         }
 258
 259         cmnd->result = sense_iu->status;
 260 }
 261
 262 /*
 263  * scsi-tags go from 0 - (nr_tags - 1), uas tags need to match stream-ids,
 264  * which go from 1 - nr_streams. And we use 1 for untagged commands.
 265  */
 266 static int uas_get_tag(struct scsi_cmnd *cmnd)
 267 {
 268         int tag;
 269
 270         if (blk_rq_tagged(cmnd->request))
 271                 tag = cmnd->request->tag + 2;
 272         else
 273                 tag = 1;
 274
 275         return tag;
 276 }
 277
 278 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller)
 279 {
 280         struct uas_cmd_info *ci = (void *)&cmnd->SCp;
 281
 282         scmd_printk(KERN_INFO, cmnd, "%s %p tag %d, inflight:"
 283                     "%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
 284                     caller, cmnd, uas_get_tag(cmnd),
 285                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
 286                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
 287                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
 288                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
 289                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
 290                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
 291                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
 292                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
 293                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
 294                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
 295                     (ci->state & COMMAND_COMPLETED)     ? " done"  : "",
 296                     (ci->state & COMMAND_ABORTED)       ? " abort" : "",
 297                     (ci->state & UNLINK_DATA_URBS)      ? " unlink": "",
 298                     (ci->state & IS_IN_WORK_LIST)       ? " work"  : "");
 299 }
 300
 301 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 302 {
 303         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 304         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 305
 306         lockdep_assert_held(&devinfo->lock);
 307         if (cmdinfo->state & (COMMAND_INFLIGHT |
 308                               DATA_IN_URB_INFLIGHT |
 309                               DATA_OUT_URB_INFLIGHT |
 310                               UNLINK_DATA_URBS))
 311                 return -EBUSY;
 312         WARN_ON_ONCE(cmdinfo->state & COMMAND_COMPLETED);
 313         cmdinfo->state |= COMMAND_COMPLETED;
 314         usb_free_urb(cmdinfo->data_in_urb);
 315         usb_free_urb(cmdinfo->data_out_urb);
 316         if (cmdinfo->state & COMMAND_ABORTED)
 317                 scmd_printk(KERN_INFO, cmnd, "abort completed\n");
 318         list_del(&cmdinfo->list);
 319         cmnd->scsi_done(cmnd);
 320         return 0;
 321 }
 322
 323 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
 324                           unsigned direction)
 325 {
 326         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 327         int err;
 328
 329         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
 330         err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 331         if (err) {
 332                 uas_add_work(cmdinfo);
 333         }
 334 }
 335
 336 static void uas_stat_cmplt(struct urb *urb)
 337 {
 338         struct iu *iu = urb->transfer_buffer;
 339         struct Scsi_Host *shost = urb->context;
 340         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 341         struct scsi_cmnd *cmnd;
 342         struct uas_cmd_info *cmdinfo;
 343         unsigned long flags;
 344         u16 tag;
 345
 346         spin_lock_irqsave(&devinfo->lock, flags);
 347
 348         if (devinfo->resetting)
 349                 goto out;
 350
 351         if (urb->status) {
 352                 if (urb->status == -ENOENT) {
 353                         dev_err(&urb->dev->dev, "stat urb: killed, stream %d\n",
 354                                 urb->stream_id);
 355                 } else {
 356                         dev_err(&urb->dev->dev, "stat urb: status %d\n",
 357                                 urb->status);
 358                 }
 359                 goto out;
 360         }
 361
 362         tag = be16_to_cpup(&iu->tag) - 1;
 363         if (tag == 0)
 364                 cmnd = devinfo->cmnd;
 365         else
 366                 cmnd = scsi_host_find_tag(shost, tag - 1);
 367
 368         if (!cmnd)
 369                 goto out;
 370
 371         cmdinfo = (void *)&cmnd->SCp;
 372         switch (iu->iu_id) {
 373         case IU_ID_STATUS:
 374                 if (devinfo->cmnd == cmnd)
 375                         devinfo->cmnd = NULL;
 376
 377                 if (urb->actual_length < 16)
 378                         devinfo->uas_sense_old = 1;
 379                 if (devinfo->uas_sense_old)
 380                         uas_sense_old(urb, cmnd);
 381                 else
 382                         uas_sense(urb, cmnd);
 383                 if (cmnd->result != 0) {
 384                         /* cancel data transfers on error */
 385                         uas_unlink_data_urbs(devinfo, cmdinfo, &flags);
 386                 }
 387                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 388                 uas_try_complete(cmnd, __func__);
 389                 break;
 390         case IU_ID_READ_READY:
 391                 if (!cmdinfo->data_in_urb ||
 392                                 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
 393                         scmd_printk(KERN_ERR, cmnd, "unexpected read rdy\n");
 394                         break;
 395                 }
 396                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
 397                 break;
 398         case IU_ID_WRITE_READY:
 399                 if (!cmdinfo->data_out_urb ||
 400                                 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
 401                         scmd_printk(KERN_ERR, cmnd, "unexpected write rdy\n");
 402                         break;
 403                 }
 404                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
 405                 break;
 406         default:
 407                 scmd_printk(KERN_ERR, cmnd,
 408                         "Bogus IU (%d) received on status pipe\n", iu->iu_id);
 409         }
 410 out:
 411         usb_free_urb(urb);
 412         spin_unlock_irqrestore(&devinfo->lock, flags);
 413 }
 414
 415 static void uas_data_cmplt(struct urb *urb)
 416 {
 417         struct scsi_cmnd *cmnd = urb->context;
 418         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 419         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 420         struct scsi_data_buffer *sdb = NULL;
 421         unsigned long flags;
 422
 423         spin_lock_irqsave(&devinfo->lock, flags);
 424
 425         if (cmdinfo->data_in_urb == urb) {
 426                 sdb = scsi_in(cmnd);
 427                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
 428         } else if (cmdinfo->data_out_urb == urb) {
 429                 sdb = scsi_out(cmnd);
 430                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
 431         }
 432         if (sdb == NULL) {
 433                 WARN_ON_ONCE(1);
 434                 goto out;
 435         }
 436
 437         if (devinfo->resetting)
 438                 goto out;
 439
 440         if (urb->status) {
 441                 if (urb->status != -ECONNRESET) {
 442                         uas_log_cmd_state(cmnd, __func__);
 443                         scmd_printk(KERN_ERR, cmnd,
 444                                 "data cmplt err %d stream %d\n",
 445                                 urb->status, urb->stream_id);
 446                 }
 447                 /* error: no data transfered */
 448                 sdb->resid = sdb->length;
 449         } else {
 450                 sdb->resid = sdb->length - urb->actual_length;
 451         }
 452         uas_try_complete(cmnd, __func__);
 453 out:
 454         spin_unlock_irqrestore(&devinfo->lock, flags);
 455 }
 456
 457 static void uas_cmd_cmplt(struct urb *urb)
 458 {
 459         struct scsi_cmnd *cmnd = urb->context;
 460
 461         if (urb->status) {
 462                 uas_log_cmd_state(cmnd, __func__);
 463                 scmd_printk(KERN_ERR, cmnd, "cmd cmplt err %d\n", urb->status);
 464         }
 465         usb_free_urb(urb);
 466 }
 467
 468 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 469                                       unsigned int pipe, u16 stream_id,
 470                                       struct scsi_cmnd *cmnd,
 471                                       enum dma_data_direction dir)
 472 {
 473         struct usb_device *udev = devinfo->udev;
 474         struct urb *urb = usb_alloc_urb(0, gfp);
 475         struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
 476                 ? scsi_in(cmnd) : scsi_out(cmnd);
 477
 478         if (!urb)
 479                 goto out;
 480         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
 481                           uas_data_cmplt, cmnd);
 482         urb->stream_id = stream_id;
 483         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
 484         urb->sg = sdb->table.sgl;
 485  out:
 486         return urb;
 487 }
 488
 489 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 490                                        struct Scsi_Host *shost, u16 stream_id)
 491 {
 492         struct usb_device *udev = devinfo->udev;
 493         struct urb *urb = usb_alloc_urb(0, gfp);
 494         struct sense_iu *iu;
 495
 496         if (!urb)
 497                 goto out;
 498
 499         iu = kzalloc(sizeof(*iu), gfp);
 500         if (!iu)
 501                 goto free;
 502
 503         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
 504                                                 uas_stat_cmplt, shost);
 505         urb->stream_id = stream_id;
 506         urb->transfer_flags |= URB_FREE_BUFFER;
 507  out:
 508         return urb;
 509  free:
 510         usb_free_urb(urb);
 511         return NULL;
 512 }
 513
 514 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 515                                         struct scsi_cmnd *cmnd)
 516 {
 517         struct usb_device *udev = devinfo->udev;
 518         struct scsi_device *sdev = cmnd->device;
 519         struct urb *urb = usb_alloc_urb(0, gfp);
 520         struct command_iu *iu;
 521         int len;
 522
 523         if (!urb)
 524                 goto out;
 525
 526         len = cmnd->cmd_len - 16;
 527         if (len < 0)
 528                 len = 0;
 529         len = ALIGN(len, 4);
 530         iu = kzalloc(sizeof(*iu) + len, gfp);
 531         if (!iu)
 532                 goto free;
 533
 534         iu->iu_id = IU_ID_COMMAND;
 535         iu->tag = cpu_to_be16(uas_get_tag(cmnd));
 536         iu->prio_attr = UAS_SIMPLE_TAG;
 537         iu->len = len;
 538         int_to_scsilun(sdev->lun, &iu->lun);
 539         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 540
 541         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
 542                                                         uas_cmd_cmplt, cmnd);
 543         urb->transfer_flags |= URB_FREE_BUFFER;
 544  out:
 545         return urb;
 546  free:
 547         usb_free_urb(urb);
 548         return NULL;
 549 }
 550
 551 /*
 552  * Why should I request the Status IU before sending the Command IU?  Spec
 553  * says to, but also says the device may receive them in any order.  Seems
 554  * daft to me.
 555  */
 556
 557 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd,
 558                                         gfp_t gfp, unsigned int stream)
 559 {
 560         struct Scsi_Host *shost = cmnd->device->host;
 561         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 562         struct urb *urb;
 563         int err;
 564
 565         urb = uas_alloc_sense_urb(devinfo, gfp, shost, stream);
 566         if (!urb)
 567                 return NULL;
 568         usb_anchor_urb(urb, &devinfo->sense_urbs);
 569         err = usb_submit_urb(urb, gfp);
 570         if (err) {
 571                 usb_unanchor_urb(urb);
 572                 uas_log_cmd_state(cmnd, __func__);
 573                 shost_printk(KERN_INFO, shost,
 574                              "sense urb submission error %d stream %d\n",
 575                              err, stream);
 576                 usb_free_urb(urb);
 577                 return NULL;
 578         }
 579         return urb;
 580 }
 581
 582 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 583                            struct uas_dev_info *devinfo, gfp_t gfp)
 584 {
 585         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 586         struct urb *urb;
 587         int err;
 588
 589         lockdep_assert_held(&devinfo->lock);
 590         if (cmdinfo->state & SUBMIT_STATUS_URB) {
 591                 urb = uas_submit_sense_urb(cmnd, gfp, cmdinfo->stream);
 592                 if (!urb)
 593                         return SCSI_MLQUEUE_DEVICE_BUSY;
 594                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
 595         }
 596
 597         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
 598                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
 599                                         devinfo->data_in_pipe, cmdinfo->stream,
 600                                         cmnd, DMA_FROM_DEVICE);
 601                 if (!cmdinfo->data_in_urb)
 602                         return SCSI_MLQUEUE_DEVICE_BUSY;
 603                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
 604         }
 605
 606         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
 607                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 608                 err = usb_submit_urb(cmdinfo->data_in_urb, gfp);
 609                 if (err) {
 610                         usb_unanchor_urb(cmdinfo->data_in_urb);
 611                         uas_log_cmd_state(cmnd, __func__);
 612                         scmd_printk(KERN_INFO, cmnd,
 613                                 "data in urb submission error %d stream %d\n",
 614                                 err, cmdinfo->data_in_urb->stream_id);
 615                         return SCSI_MLQUEUE_DEVICE_BUSY;
 616                 }
 617                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 618                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
 619         }
 620
 621         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
 622                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
 623                                         devinfo->data_out_pipe, cmdinfo->stream,
 624                                         cmnd, DMA_TO_DEVICE);
 625                 if (!cmdinfo->data_out_urb)
 626                         return SCSI_MLQUEUE_DEVICE_BUSY;
 627                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
 628         }
 629
 630         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
 631                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 632                 err = usb_submit_urb(cmdinfo->data_out_urb, gfp);
 633                 if (err) {
 634                         usb_unanchor_urb(cmdinfo->data_out_urb);
 635                         uas_log_cmd_state(cmnd, __func__);
 636                         scmd_printk(KERN_INFO, cmnd,
 637                                 "data out urb submission error %d stream %d\n",
 638                                 err, cmdinfo->data_out_urb->stream_id);
 639                         return SCSI_MLQUEUE_DEVICE_BUSY;
 640                 }
 641                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 642                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
 643         }
 644
 645         if (cmdinfo->state & ALLOC_CMD_URB) {
 646                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd);
 647                 if (!cmdinfo->cmd_urb)
 648                         return SCSI_MLQUEUE_DEVICE_BUSY;
 649                 cmdinfo->state &= ~ALLOC_CMD_URB;
 650         }
 651
 652         if (cmdinfo->state & SUBMIT_CMD_URB) {
 653                 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
 654                 err = usb_submit_urb(cmdinfo->cmd_urb, gfp);
 655                 if (err) {
 656                         usb_unanchor_urb(cmdinfo->cmd_urb);
 657                         uas_log_cmd_state(cmnd, __func__);
 658                         scmd_printk(KERN_INFO, cmnd,
 659                                     "cmd urb submission error %d\n", err);
 660                         return SCSI_MLQUEUE_DEVICE_BUSY;
 661                 }
 662                 cmdinfo->cmd_urb = NULL;
 663                 cmdinfo->state &= ~SUBMIT_CMD_URB;
 664                 cmdinfo->state |= COMMAND_INFLIGHT;
 665         }
 666
 667         return 0;
 668 }
 669
 670 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
 671                                         void (*done)(struct scsi_cmnd *))
 672 {
 673         struct scsi_device *sdev = cmnd->device;
 674         struct uas_dev_info *devinfo = sdev->hostdata;
 675         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 676         unsigned long flags;
 677         int err;
 678
 679         BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
 680
 681         if ((devinfo->flags & US_FL_NO_ATA_1X) &&
 682                         (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
 683                 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
 684                        sizeof(usb_stor_sense_invalidCDB));
 685                 cmnd->result = SAM_STAT_CHECK_CONDITION;
 686                 cmnd->scsi_done(cmnd);
 687                 return 0;
 688         }
 689
 690         spin_lock_irqsave(&devinfo->lock, flags);
 691
 692         if (devinfo->resetting) {
 693                 cmnd->result = DID_ERROR << 16;
 694                 cmnd->scsi_done(cmnd);
 695                 spin_unlock_irqrestore(&devinfo->lock, flags);
 696                 return 0;
 697         }
 698
 699         if (devinfo->cmnd) {
 700                 spin_unlock_irqrestore(&devinfo->lock, flags);
 701                 return SCSI_MLQUEUE_DEVICE_BUSY;
 702         }
 703
 704         memset(cmdinfo, 0, sizeof(*cmdinfo));
 705
 706         if (!blk_rq_tagged(cmnd->request))
 707                 devinfo->cmnd = cmnd;
 708
 709         cmnd->scsi_done = done;
 710
 711         cmdinfo->stream = uas_get_tag(cmnd);
 712         cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
 713
 714         switch (cmnd->sc_data_direction) {
 715         case DMA_FROM_DEVICE:
 716                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 717                 break;
 718         case DMA_BIDIRECTIONAL:
 719                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 720         case DMA_TO_DEVICE:
 721                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
 722         case DMA_NONE:
 723                 break;
 724         }
 725
 726         if (!devinfo->use_streams) {
 727                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
 728                 cmdinfo->stream = 0;
 729         }
 730
 731         err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
 732         if (err) {
 733                 /* If we did nothing, give up now */
 734                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
 735                         spin_unlock_irqrestore(&devinfo->lock, flags);
 736                         return SCSI_MLQUEUE_DEVICE_BUSY;
 737                 }
 738                 uas_add_work(cmdinfo);
 739         }
 740
 741         list_add_tail(&cmdinfo->list, &devinfo->inflight_list);
 742         spin_unlock_irqrestore(&devinfo->lock, flags);
 743         return 0;
 744 }
 745
 746 static DEF_SCSI_QCMD(uas_queuecommand)
 747
 748 static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
 749 {
 750         struct scsi_device *sdev = cmnd->device;
 751         struct uas_dev_info *devinfo = sdev->hostdata;
 752         struct usb_device *udev = devinfo->udev;
 753         unsigned long flags;
 754         int err;
 755
 756         err = usb_lock_device_for_reset(udev, devinfo->intf);
 757         if (err) {
 758                 shost_printk(KERN_ERR, sdev->host,
 759                              "%s FAILED to get lock err %d\n", __func__, err);
 760                 return FAILED;
 761         }
 762
 763         shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
 764
 765         spin_lock_irqsave(&devinfo->lock, flags);
 766         devinfo->resetting = 1;
 767         spin_unlock_irqrestore(&devinfo->lock, flags);
 768
 769         uas_abort_inflight(devinfo, DID_RESET, __func__);
 770         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
 771         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 772         usb_kill_anchored_urbs(&devinfo->data_urbs);
 773         uas_zap_dead(devinfo);
 774         err = usb_reset_device(udev);
 775
 776         spin_lock_irqsave(&devinfo->lock, flags);
 777         devinfo->resetting = 0;
 778         spin_unlock_irqrestore(&devinfo->lock, flags);
 779
 780         usb_unlock_device(udev);
 781
 782         if (err) {
 783                 shost_printk(KERN_INFO, sdev->host, "%s FAILED\n", __func__);
 784                 return FAILED;
 785         }
 786
 787         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
 788         return SUCCESS;
 789 }
 790
 791 static int uas_slave_alloc(struct scsi_device *sdev)
 792 {
 793         sdev->hostdata = (void *)sdev->host->hostdata;
 794
 795         /* USB has unusual DMA-alignment requirements: Although the
 796          * starting address of each scatter-gather element doesn't matter,
 797          * the length of each element except the last must be divisible
 798          * by the Bulk maxpacket value.  There's currently no way to
 799          * express this by block-layer constraints, so we'll cop out
 800          * and simply require addresses to be aligned at 512-byte
 801          * boundaries.  This is okay since most block I/O involves
 802          * hardware sectors that are multiples of 512 bytes in length,
 803          * and since host controllers up through USB 2.0 have maxpacket
 804          * values no larger than 512.
 805          *
 806          * But it doesn't suffice for Wireless USB, where Bulk maxpacket
 807          * values can be as large as 2048.  To make that work properly
 808          * will require changes to the block layer.
 809          */
 810         blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
 811
 812         return 0;
 813 }
 814
 815 static int uas_slave_configure(struct scsi_device *sdev)
 816 {
 817         struct uas_dev_info *devinfo = sdev->hostdata;
 818
 819         if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
 820                 sdev->no_report_opcodes = 1;
 821
 822         scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
 823         scsi_activate_tcq(sdev, devinfo->qdepth - 2);
 824         return 0;
 825 }
 826
 827 static struct scsi_host_template uas_host_template = {
 828         .module = THIS_MODULE,
 829         .name = "uas",
 830         .queuecommand = uas_queuecommand,
 831         .slave_alloc = uas_slave_alloc,
 832         .slave_configure = uas_slave_configure,
 833         .eh_bus_reset_handler = uas_eh_bus_reset_handler,
 834         .can_queue = 65536,     /* Is there a limit on the _host_ ? */
 835         .this_id = -1,
 836         .sg_tablesize = SG_NONE,
 837         .cmd_per_lun = 1,       /* until we override it */
 838         .skip_settle_delay = 1,
 839         .ordered_tag = 1,
 840 };
 841
 842 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 843                     vendorName, productName, useProtocol, useTransport, \
 844                     initFunction, flags) \
 845 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
 846         .driver_info = (flags) }
 847
 848 static struct usb_device_id uas_usb_ids[] = {
 849 #       include "unusual_uas.h"
 850         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
 851         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
 852         /* 0xaa is a prototype device I happen to have access to */
 853         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
 854         { }
 855 };
 856 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
 857
 858 #undef UNUSUAL_DEV
 859
 860 static int uas_switch_interface(struct usb_device *udev,
 861                                 struct usb_interface *intf)
 862 {
 863         int alt;
 864
 865         alt = uas_find_uas_alt_setting(intf);
 866         if (alt < 0)
 867                 return alt;
 868
 869         return usb_set_interface(udev,
 870                         intf->altsetting[0].desc.bInterfaceNumber, alt);
 871 }
 872
 873 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
 874 {
 875         struct usb_host_endpoint *eps[4] = { };
 876         struct usb_device *udev = devinfo->udev;
 877         int r;
 878
 879         devinfo->uas_sense_old = 0;
 880         devinfo->cmnd = NULL;
 881
 882         r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
 883         if (r)
 884                 return r;
 885
 886         devinfo->cmd_pipe = usb_sndbulkpipe(udev,
 887                                             usb_endpoint_num(&eps[0]->desc));
 888         devinfo->status_pipe = usb_rcvbulkpipe(udev,
 889                                             usb_endpoint_num(&eps[1]->desc));
 890         devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
 891                                             usb_endpoint_num(&eps[2]->desc));
 892         devinfo->data_out_pipe = usb_sndbulkpipe(udev,
 893                                             usb_endpoint_num(&eps[3]->desc));
 894
 895         if (udev->speed != USB_SPEED_SUPER) {
 896                 devinfo->qdepth = 32;
 897                 devinfo->use_streams = 0;
 898         } else {
 899                 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
 900                                                     3, 256, GFP_NOIO);
 901                 if (devinfo->qdepth < 0)
 902                         return devinfo->qdepth;
 903                 devinfo->use_streams = 1;
 904         }
 905
 906         return 0;
 907 }
 908
 909 static void uas_free_streams(struct uas_dev_info *devinfo)
 910 {
 911         struct usb_device *udev = devinfo->udev;
 912         struct usb_host_endpoint *eps[3];
 913
 914         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 915         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 916         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 917         usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
 918 }
 919
 920 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 921 {
 922         int result = -ENOMEM;
 923         struct Scsi_Host *shost = NULL;
 924         struct uas_dev_info *devinfo;
 925         struct usb_device *udev = interface_to_usbdev(intf);
 926
 927         if (!uas_use_uas_driver(intf, id))
 928                 return -ENODEV;
 929
 930         if (uas_switch_interface(udev, intf))
 931                 return -ENODEV;
 932
 933         shost = scsi_host_alloc(&uas_host_template,
 934                                 sizeof(struct uas_dev_info));
 935         if (!shost)
 936                 goto set_alt0;
 937
 938         shost->max_cmd_len = 16 + 252;
 939         shost->max_id = 1;
 940         shost->max_lun = 256;
 941         shost->max_channel = 0;
 942         shost->sg_tablesize = udev->bus->sg_tablesize;
 943
 944         devinfo = (struct uas_dev_info *)shost->hostdata;
 945         devinfo->intf = intf;
 946         devinfo->udev = udev;
 947         devinfo->resetting = 0;
 948         devinfo->shutdown = 0;
 949         devinfo->flags = id->driver_info;
 950         usb_stor_adjust_quirks(udev, &devinfo->flags);
 951         init_usb_anchor(&devinfo->cmd_urbs);
 952         init_usb_anchor(&devinfo->sense_urbs);
 953         init_usb_anchor(&devinfo->data_urbs);
 954         spin_lock_init(&devinfo->lock);
 955         INIT_WORK(&devinfo->work, uas_do_work);
 956         INIT_LIST_HEAD(&devinfo->inflight_list);
 957         INIT_LIST_HEAD(&devinfo->dead_list);
 958
 959         result = uas_configure_endpoints(devinfo);
 960         if (result)
 961                 goto set_alt0;
 962
 963         result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2);
 964         if (result)
 965                 goto free_streams;
 966
 967         usb_set_intfdata(intf, shost);
 968         result = scsi_add_host(shost, &intf->dev);
 969         if (result)
 970                 goto free_streams;
 971
 972         scsi_scan_host(shost);
 973         return result;
 974
 975 free_streams:
 976         uas_free_streams(devinfo);
 977         usb_set_intfdata(intf, NULL);
 978 set_alt0:
 979         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
 980         if (shost)
 981                 scsi_host_put(shost);
 982         return result;
 983 }
 984
 985 static int uas_pre_reset(struct usb_interface *intf)
 986 {
 987         struct Scsi_Host *shost = usb_get_intfdata(intf);
 988         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 989         unsigned long flags;
 990
 991         if (devinfo->shutdown)
 992                 return 0;
 993
 994         /* Block new requests */
 995         spin_lock_irqsave(shost->host_lock, flags);
 996         scsi_block_requests(shost);
 997         spin_unlock_irqrestore(shost->host_lock, flags);
 998
 999         /* Wait for any pending requests to complete */
1000         flush_work(&devinfo->work);
1001         if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000) == 0) {
1002                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1003                 return 1;
1004         }
1005
1006         uas_free_streams(devinfo);
1007
1008         return 0;
1009 }
1010
1011 static int uas_post_reset(struct usb_interface *intf)
1012 {
1013         struct Scsi_Host *shost = usb_get_intfdata(intf);
1014         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1015         unsigned long flags;
1016
1017         if (devinfo->shutdown)
1018                 return 0;
1019
1020         if (uas_configure_endpoints(devinfo) != 0) {
1021                 shost_printk(KERN_ERR, shost,
1022                              "%s: alloc streams error after reset", __func__);
1023                 return 1;
1024         }
1025
1026         spin_lock_irqsave(shost->host_lock, flags);
1027         scsi_report_bus_reset(shost, 0);
1028         spin_unlock_irqrestore(shost->host_lock, flags);
1029
1030         scsi_unblock_requests(shost);
1031
1032         return 0;
1033 }
1034
1035 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1036 {
1037         struct Scsi_Host *shost = usb_get_intfdata(intf);
1038         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1039
1040         /* Wait for any pending requests to complete */
1041         flush_work(&devinfo->work);
1042         if (usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000) == 0) {
1043                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1044                 return -ETIME;
1045         }
1046
1047         return 0;
1048 }
1049
1050 static int uas_resume(struct usb_interface *intf)
1051 {
1052         return 0;
1053 }
1054
1055 static int uas_reset_resume(struct usb_interface *intf)
1056 {
1057         struct Scsi_Host *shost = usb_get_intfdata(intf);
1058         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1059         unsigned long flags;
1060
1061         if (uas_configure_endpoints(devinfo) != 0) {
1062                 shost_printk(KERN_ERR, shost,
1063                              "%s: alloc streams error after reset", __func__);
1064                 return -EIO;
1065         }
1066
1067         spin_lock_irqsave(shost->host_lock, flags);
1068         scsi_report_bus_reset(shost, 0);
1069         spin_unlock_irqrestore(shost->host_lock, flags);
1070
1071         return 0;
1072 }
1073
1074 static void uas_disconnect(struct usb_interface *intf)
1075 {
1076         struct Scsi_Host *shost = usb_get_intfdata(intf);
1077         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1078         unsigned long flags;
1079
1080         spin_lock_irqsave(&devinfo->lock, flags);
1081         devinfo->resetting = 1;
1082         spin_unlock_irqrestore(&devinfo->lock, flags);
1083
1084         cancel_work_sync(&devinfo->work);
1085         uas_abort_inflight(devinfo, DID_NO_CONNECT, __func__);
1086         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1087         usb_kill_anchored_urbs(&devinfo->sense_urbs);
1088         usb_kill_anchored_urbs(&devinfo->data_urbs);
1089         uas_zap_dead(devinfo);
1090         scsi_remove_host(shost);
1091         uas_free_streams(devinfo);
1092         scsi_host_put(shost);
1093 }
1094
1095 /*
1096  * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1097  * hang on reboot when the device is still in uas mode. Note the reset is
1098  * necessary as some devices won't revert to usb-storage mode without it.
1099  */
1100 static void uas_shutdown(struct device *dev)
1101 {
1102         struct usb_interface *intf = to_usb_interface(dev);
1103         struct usb_device *udev = interface_to_usbdev(intf);
1104         struct Scsi_Host *shost = usb_get_intfdata(intf);
1105         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1106
1107         if (system_state != SYSTEM_RESTART)
1108                 return;
1109
1110         devinfo->shutdown = 1;
1111         uas_free_streams(devinfo);
1112         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1113         usb_reset_device(udev);
1114 }
1115
1116 static struct usb_driver uas_driver = {
1117         .name = "uas",
1118         .probe = uas_probe,
1119         .disconnect = uas_disconnect,
1120         .pre_reset = uas_pre_reset,
1121         .post_reset = uas_post_reset,
1122         .suspend = uas_suspend,
1123         .resume = uas_resume,
1124         .reset_resume = uas_reset_resume,
1125         .drvwrap.driver.shutdown = uas_shutdown,
1126         .id_table = uas_usb_ids,
1127 };
1128
1129 module_usb_driver(uas_driver);
1130
1131 MODULE_LICENSE("GPL");
1132 MODULE_AUTHOR(
1133         "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");