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