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 /* 85 * This driver needs its own workqueue, as we need to control memory allocation. 86 * 87 * In the course of error handling and power management uas_wait_for_pending_cmnds() 88 * needs to flush pending work items. In these contexts we cannot allocate memory 89 * by doing block IO as we would deadlock. For the same reason we cannot wait 90 * for anything allocating memory not heeding these constraints. 91 * 92 * So we have to control all work items that can be on the workqueue we flush. 93 * Hence we cannot share a queue and need our own. 94 */ 95 static struct workqueue_struct *workqueue; 96 97 static void uas_do_work(struct work_struct *work) 98 { 99 struct uas_dev_info *devinfo = 100 container_of(work, struct uas_dev_info, work); 101 struct uas_cmd_info *cmdinfo; 102 struct scsi_cmnd *cmnd; 103 unsigned long flags; 104 int i, err; 105 106 spin_lock_irqsave(&devinfo->lock, flags); 107 108 if (devinfo->resetting) 109 goto out; 110 111 for (i = 0; i < devinfo->qdepth; i++) { 112 if (!devinfo->cmnd[i]) 113 continue; 114 115 cmnd = devinfo->cmnd[i]; 116 cmdinfo = (void *)&cmnd->SCp; 117 118 if (!(cmdinfo->state & IS_IN_WORK_LIST)) 119 continue; 120 121 err = uas_submit_urbs(cmnd, cmnd->device->hostdata); 122 if (!err) 123 cmdinfo->state &= ~IS_IN_WORK_LIST; 124 else 125 queue_work(workqueue, &devinfo->work); 126 } 127 out: 128 spin_unlock_irqrestore(&devinfo->lock, flags); 129 } 130 131 static void uas_scan_work(struct work_struct *work) 132 { 133 struct uas_dev_info *devinfo = 134 container_of(work, struct uas_dev_info, scan_work); 135 struct Scsi_Host *shost = usb_get_intfdata(devinfo->intf); 136 137 dev_dbg(&devinfo->intf->dev, "starting scan\n"); 138 scsi_scan_host(shost); 139 dev_dbg(&devinfo->intf->dev, "scan complete\n"); 140 } 141 142 static void uas_add_work(struct uas_cmd_info *cmdinfo) 143 { 144 struct scsi_pointer *scp = (void *)cmdinfo; 145 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp); 146 struct uas_dev_info *devinfo = cmnd->device->hostdata; 147 148 lockdep_assert_held(&devinfo->lock); 149 cmdinfo->state |= IS_IN_WORK_LIST; 150 queue_work(workqueue, &devinfo->work); 151 } 152 153 static void uas_zap_pending(struct uas_dev_info *devinfo, int result) 154 { 155 struct uas_cmd_info *cmdinfo; 156 struct scsi_cmnd *cmnd; 157 unsigned long flags; 158 int i, err; 159 160 spin_lock_irqsave(&devinfo->lock, flags); 161 for (i = 0; i < devinfo->qdepth; i++) { 162 if (!devinfo->cmnd[i]) 163 continue; 164 165 cmnd = devinfo->cmnd[i]; 166 cmdinfo = (void *)&cmnd->SCp; 167 uas_log_cmd_state(cmnd, __func__, 0); 168 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */ 169 cmdinfo->state &= ~COMMAND_INFLIGHT; 170 cmnd->result = result << 16; 171 err = uas_try_complete(cmnd, __func__); 172 WARN_ON(err != 0); 173 } 174 spin_unlock_irqrestore(&devinfo->lock, flags); 175 } 176 177 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd) 178 { 179 struct sense_iu *sense_iu = urb->transfer_buffer; 180 struct scsi_device *sdev = cmnd->device; 181 182 if (urb->actual_length > 16) { 183 unsigned len = be16_to_cpup(&sense_iu->len); 184 if (len + 16 != urb->actual_length) { 185 int newlen = min(len + 16, urb->actual_length) - 16; 186 if (newlen < 0) 187 newlen = 0; 188 sdev_printk(KERN_INFO, sdev, "%s: urb length %d " 189 "disagrees with IU sense data length %d, " 190 "using %d bytes of sense data\n", __func__, 191 urb->actual_length, len, newlen); 192 len = newlen; 193 } 194 memcpy(cmnd->sense_buffer, sense_iu->sense, len); 195 } 196 197 cmnd->result = sense_iu->status; 198 } 199 200 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix, 201 int status) 202 { 203 struct uas_cmd_info *ci = (void *)&cmnd->SCp; 204 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 205 206 if (status == -ENODEV) /* too late */ 207 return; 208 209 scmd_printk(KERN_INFO, cmnd, 210 "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ", 211 prefix, status, cmdinfo->uas_tag, 212 (ci->state & SUBMIT_STATUS_URB) ? " s-st" : "", 213 (ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "", 214 (ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "", 215 (ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "", 216 (ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "", 217 (ci->state & ALLOC_CMD_URB) ? " a-cmd" : "", 218 (ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "", 219 (ci->state & COMMAND_INFLIGHT) ? " CMD" : "", 220 (ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "", 221 (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "", 222 (ci->state & COMMAND_ABORTED) ? " abort" : "", 223 (ci->state & IS_IN_WORK_LIST) ? " work" : ""); 224 scsi_print_command(cmnd); 225 } 226 227 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd) 228 { 229 struct uas_cmd_info *cmdinfo; 230 231 if (!cmnd) 232 return; 233 234 cmdinfo = (void *)&cmnd->SCp; 235 236 if (cmdinfo->state & SUBMIT_CMD_URB) 237 usb_free_urb(cmdinfo->cmd_urb); 238 239 /* data urbs may have never gotten their submit flag set */ 240 if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT)) 241 usb_free_urb(cmdinfo->data_in_urb); 242 if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT)) 243 usb_free_urb(cmdinfo->data_out_urb); 244 } 245 246 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller) 247 { 248 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 249 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; 250 251 lockdep_assert_held(&devinfo->lock); 252 if (cmdinfo->state & (COMMAND_INFLIGHT | 253 DATA_IN_URB_INFLIGHT | 254 DATA_OUT_URB_INFLIGHT | 255 COMMAND_ABORTED)) 256 return -EBUSY; 257 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL; 258 uas_free_unsubmitted_urbs(cmnd); 259 cmnd->scsi_done(cmnd); 260 return 0; 261 } 262 263 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd, 264 unsigned direction) 265 { 266 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 267 int err; 268 269 cmdinfo->state |= direction | SUBMIT_STATUS_URB; 270 err = uas_submit_urbs(cmnd, cmnd->device->hostdata); 271 if (err) { 272 uas_add_work(cmdinfo); 273 } 274 } 275 276 static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd) 277 { 278 u8 response_code = riu->response_code; 279 280 switch (response_code) { 281 case RC_INCORRECT_LUN: 282 set_host_byte(cmnd, DID_BAD_TARGET); 283 break; 284 case RC_TMF_SUCCEEDED: 285 set_host_byte(cmnd, DID_OK); 286 break; 287 case RC_TMF_NOT_SUPPORTED: 288 set_host_byte(cmnd, DID_TARGET_FAILURE); 289 break; 290 default: 291 uas_log_cmd_state(cmnd, "response iu", response_code); 292 set_host_byte(cmnd, DID_ERROR); 293 break; 294 } 295 296 return response_code == RC_TMF_SUCCEEDED; 297 } 298 299 static void uas_stat_cmplt(struct urb *urb) 300 { 301 struct iu *iu = urb->transfer_buffer; 302 struct Scsi_Host *shost = urb->context; 303 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 304 struct urb *data_in_urb = NULL; 305 struct urb *data_out_urb = NULL; 306 struct scsi_cmnd *cmnd; 307 struct uas_cmd_info *cmdinfo; 308 unsigned long flags; 309 unsigned int idx; 310 int status = urb->status; 311 bool success; 312 313 spin_lock_irqsave(&devinfo->lock, flags); 314 315 if (devinfo->resetting) 316 goto out; 317 318 if (status) { 319 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN) 320 dev_err(&urb->dev->dev, "stat urb: status %d\n", status); 321 goto out; 322 } 323 324 idx = be16_to_cpup(&iu->tag) - 1; 325 if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) { 326 dev_err(&urb->dev->dev, 327 "stat urb: no pending cmd for uas-tag %d\n", idx + 1); 328 goto out; 329 } 330 331 cmnd = devinfo->cmnd[idx]; 332 cmdinfo = (void *)&cmnd->SCp; 333 334 if (!(cmdinfo->state & COMMAND_INFLIGHT)) { 335 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0); 336 goto out; 337 } 338 339 switch (iu->iu_id) { 340 case IU_ID_STATUS: 341 uas_sense(urb, cmnd); 342 if (cmnd->result != 0) { 343 /* cancel data transfers on error */ 344 data_in_urb = usb_get_urb(cmdinfo->data_in_urb); 345 data_out_urb = usb_get_urb(cmdinfo->data_out_urb); 346 } 347 cmdinfo->state &= ~COMMAND_INFLIGHT; 348 uas_try_complete(cmnd, __func__); 349 break; 350 case IU_ID_READ_READY: 351 if (!cmdinfo->data_in_urb || 352 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) { 353 uas_log_cmd_state(cmnd, "unexpected read rdy", 0); 354 break; 355 } 356 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB); 357 break; 358 case IU_ID_WRITE_READY: 359 if (!cmdinfo->data_out_urb || 360 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) { 361 uas_log_cmd_state(cmnd, "unexpected write rdy", 0); 362 break; 363 } 364 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB); 365 break; 366 case IU_ID_RESPONSE: 367 cmdinfo->state &= ~COMMAND_INFLIGHT; 368 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd); 369 if (!success) { 370 /* Error, cancel data transfers */ 371 data_in_urb = usb_get_urb(cmdinfo->data_in_urb); 372 data_out_urb = usb_get_urb(cmdinfo->data_out_urb); 373 } 374 uas_try_complete(cmnd, __func__); 375 break; 376 default: 377 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id); 378 } 379 out: 380 usb_free_urb(urb); 381 spin_unlock_irqrestore(&devinfo->lock, flags); 382 383 /* Unlinking of data urbs must be done without holding the lock */ 384 if (data_in_urb) { 385 usb_unlink_urb(data_in_urb); 386 usb_put_urb(data_in_urb); 387 } 388 if (data_out_urb) { 389 usb_unlink_urb(data_out_urb); 390 usb_put_urb(data_out_urb); 391 } 392 } 393 394 static void uas_data_cmplt(struct urb *urb) 395 { 396 struct scsi_cmnd *cmnd = urb->context; 397 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 398 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; 399 struct scsi_data_buffer *sdb = &cmnd->sdb; 400 unsigned long flags; 401 int status = urb->status; 402 403 spin_lock_irqsave(&devinfo->lock, flags); 404 405 if (cmdinfo->data_in_urb == urb) { 406 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT; 407 cmdinfo->data_in_urb = NULL; 408 } else if (cmdinfo->data_out_urb == urb) { 409 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT; 410 cmdinfo->data_out_urb = NULL; 411 } 412 413 if (devinfo->resetting) 414 goto out; 415 416 /* Data urbs should not complete before the cmd urb is submitted */ 417 if (cmdinfo->state & SUBMIT_CMD_URB) { 418 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0); 419 goto out; 420 } 421 422 if (status) { 423 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN) 424 uas_log_cmd_state(cmnd, "data cmplt err", status); 425 /* error: no data transfered */ 426 scsi_set_resid(cmnd, sdb->length); 427 } else { 428 scsi_set_resid(cmnd, sdb->length - urb->actual_length); 429 } 430 uas_try_complete(cmnd, __func__); 431 out: 432 usb_free_urb(urb); 433 spin_unlock_irqrestore(&devinfo->lock, flags); 434 } 435 436 static void uas_cmd_cmplt(struct urb *urb) 437 { 438 if (urb->status) 439 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status); 440 441 usb_free_urb(urb); 442 } 443 444 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp, 445 struct scsi_cmnd *cmnd, 446 enum dma_data_direction dir) 447 { 448 struct usb_device *udev = devinfo->udev; 449 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 450 struct urb *urb = usb_alloc_urb(0, gfp); 451 struct scsi_data_buffer *sdb = &cmnd->sdb; 452 unsigned int pipe = (dir == DMA_FROM_DEVICE) 453 ? devinfo->data_in_pipe : devinfo->data_out_pipe; 454 455 if (!urb) 456 goto out; 457 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, 458 uas_data_cmplt, cmnd); 459 if (devinfo->use_streams) 460 urb->stream_id = cmdinfo->uas_tag; 461 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0; 462 urb->sg = sdb->table.sgl; 463 out: 464 return urb; 465 } 466 467 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp, 468 struct scsi_cmnd *cmnd) 469 { 470 struct usb_device *udev = devinfo->udev; 471 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 472 struct urb *urb = usb_alloc_urb(0, gfp); 473 struct sense_iu *iu; 474 475 if (!urb) 476 goto out; 477 478 iu = kzalloc(sizeof(*iu), gfp); 479 if (!iu) 480 goto free; 481 482 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu), 483 uas_stat_cmplt, cmnd->device->host); 484 if (devinfo->use_streams) 485 urb->stream_id = cmdinfo->uas_tag; 486 urb->transfer_flags |= URB_FREE_BUFFER; 487 out: 488 return urb; 489 free: 490 usb_free_urb(urb); 491 return NULL; 492 } 493 494 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp, 495 struct scsi_cmnd *cmnd) 496 { 497 struct usb_device *udev = devinfo->udev; 498 struct scsi_device *sdev = cmnd->device; 499 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 500 struct urb *urb = usb_alloc_urb(0, gfp); 501 struct command_iu *iu; 502 int len; 503 504 if (!urb) 505 goto out; 506 507 len = cmnd->cmd_len - 16; 508 if (len < 0) 509 len = 0; 510 len = ALIGN(len, 4); 511 iu = kzalloc(sizeof(*iu) + len, gfp); 512 if (!iu) 513 goto free; 514 515 iu->iu_id = IU_ID_COMMAND; 516 iu->tag = cpu_to_be16(cmdinfo->uas_tag); 517 iu->prio_attr = UAS_SIMPLE_TAG; 518 iu->len = len; 519 int_to_scsilun(sdev->lun, &iu->lun); 520 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len); 521 522 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len, 523 uas_cmd_cmplt, NULL); 524 urb->transfer_flags |= URB_FREE_BUFFER; 525 out: 526 return urb; 527 free: 528 usb_free_urb(urb); 529 return NULL; 530 } 531 532 /* 533 * Why should I request the Status IU before sending the Command IU? Spec 534 * says to, but also says the device may receive them in any order. Seems 535 * daft to me. 536 */ 537 538 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp) 539 { 540 struct uas_dev_info *devinfo = cmnd->device->hostdata; 541 struct urb *urb; 542 int err; 543 544 urb = uas_alloc_sense_urb(devinfo, gfp, cmnd); 545 if (!urb) 546 return NULL; 547 usb_anchor_urb(urb, &devinfo->sense_urbs); 548 err = usb_submit_urb(urb, gfp); 549 if (err) { 550 usb_unanchor_urb(urb); 551 uas_log_cmd_state(cmnd, "sense submit err", err); 552 usb_free_urb(urb); 553 return NULL; 554 } 555 return urb; 556 } 557 558 static int uas_submit_urbs(struct scsi_cmnd *cmnd, 559 struct uas_dev_info *devinfo) 560 { 561 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 562 struct urb *urb; 563 int err; 564 565 lockdep_assert_held(&devinfo->lock); 566 if (cmdinfo->state & SUBMIT_STATUS_URB) { 567 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC); 568 if (!urb) 569 return SCSI_MLQUEUE_DEVICE_BUSY; 570 cmdinfo->state &= ~SUBMIT_STATUS_URB; 571 } 572 573 if (cmdinfo->state & ALLOC_DATA_IN_URB) { 574 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC, 575 cmnd, DMA_FROM_DEVICE); 576 if (!cmdinfo->data_in_urb) 577 return SCSI_MLQUEUE_DEVICE_BUSY; 578 cmdinfo->state &= ~ALLOC_DATA_IN_URB; 579 } 580 581 if (cmdinfo->state & SUBMIT_DATA_IN_URB) { 582 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs); 583 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC); 584 if (err) { 585 usb_unanchor_urb(cmdinfo->data_in_urb); 586 uas_log_cmd_state(cmnd, "data in submit err", err); 587 return SCSI_MLQUEUE_DEVICE_BUSY; 588 } 589 cmdinfo->state &= ~SUBMIT_DATA_IN_URB; 590 cmdinfo->state |= DATA_IN_URB_INFLIGHT; 591 } 592 593 if (cmdinfo->state & ALLOC_DATA_OUT_URB) { 594 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC, 595 cmnd, DMA_TO_DEVICE); 596 if (!cmdinfo->data_out_urb) 597 return SCSI_MLQUEUE_DEVICE_BUSY; 598 cmdinfo->state &= ~ALLOC_DATA_OUT_URB; 599 } 600 601 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) { 602 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs); 603 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC); 604 if (err) { 605 usb_unanchor_urb(cmdinfo->data_out_urb); 606 uas_log_cmd_state(cmnd, "data out submit err", err); 607 return SCSI_MLQUEUE_DEVICE_BUSY; 608 } 609 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB; 610 cmdinfo->state |= DATA_OUT_URB_INFLIGHT; 611 } 612 613 if (cmdinfo->state & ALLOC_CMD_URB) { 614 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd); 615 if (!cmdinfo->cmd_urb) 616 return SCSI_MLQUEUE_DEVICE_BUSY; 617 cmdinfo->state &= ~ALLOC_CMD_URB; 618 } 619 620 if (cmdinfo->state & SUBMIT_CMD_URB) { 621 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs); 622 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC); 623 if (err) { 624 usb_unanchor_urb(cmdinfo->cmd_urb); 625 uas_log_cmd_state(cmnd, "cmd submit err", err); 626 return SCSI_MLQUEUE_DEVICE_BUSY; 627 } 628 cmdinfo->cmd_urb = NULL; 629 cmdinfo->state &= ~SUBMIT_CMD_URB; 630 cmdinfo->state |= COMMAND_INFLIGHT; 631 } 632 633 return 0; 634 } 635 636 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, 637 void (*done)(struct scsi_cmnd *)) 638 { 639 struct scsi_device *sdev = cmnd->device; 640 struct uas_dev_info *devinfo = sdev->hostdata; 641 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 642 unsigned long flags; 643 int idx, err; 644 645 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer)); 646 647 /* Re-check scsi_block_requests now that we've the host-lock */ 648 if (cmnd->device->host->host_self_blocked) 649 return SCSI_MLQUEUE_DEVICE_BUSY; 650 651 if ((devinfo->flags & US_FL_NO_ATA_1X) && 652 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) { 653 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB, 654 sizeof(usb_stor_sense_invalidCDB)); 655 cmnd->result = SAM_STAT_CHECK_CONDITION; 656 cmnd->scsi_done(cmnd); 657 return 0; 658 } 659 660 spin_lock_irqsave(&devinfo->lock, flags); 661 662 if (devinfo->resetting) { 663 set_host_byte(cmnd, DID_ERROR); 664 cmnd->scsi_done(cmnd); 665 goto zombie; 666 } 667 668 /* Find a free uas-tag */ 669 for (idx = 0; idx < devinfo->qdepth; idx++) { 670 if (!devinfo->cmnd[idx]) 671 break; 672 } 673 if (idx == devinfo->qdepth) { 674 spin_unlock_irqrestore(&devinfo->lock, flags); 675 return SCSI_MLQUEUE_DEVICE_BUSY; 676 } 677 678 cmnd->scsi_done = done; 679 680 memset(cmdinfo, 0, sizeof(*cmdinfo)); 681 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */ 682 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB; 683 684 switch (cmnd->sc_data_direction) { 685 case DMA_FROM_DEVICE: 686 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; 687 break; 688 case DMA_BIDIRECTIONAL: 689 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; 690 fallthrough; 691 case DMA_TO_DEVICE: 692 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB; 693 break; 694 case DMA_NONE: 695 break; 696 } 697 698 if (!devinfo->use_streams) 699 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB); 700 701 err = uas_submit_urbs(cmnd, devinfo); 702 /* 703 * in case of fatal errors the SCSI layer is peculiar 704 * a command that has finished is a success for the purpose 705 * of queueing, no matter how fatal the error 706 */ 707 if (err == -ENODEV) { 708 set_host_byte(cmnd, DID_ERROR); 709 cmnd->scsi_done(cmnd); 710 goto zombie; 711 } 712 if (err) { 713 /* If we did nothing, give up now */ 714 if (cmdinfo->state & SUBMIT_STATUS_URB) { 715 spin_unlock_irqrestore(&devinfo->lock, flags); 716 return SCSI_MLQUEUE_DEVICE_BUSY; 717 } 718 uas_add_work(cmdinfo); 719 } 720 721 devinfo->cmnd[idx] = cmnd; 722 zombie: 723 spin_unlock_irqrestore(&devinfo->lock, flags); 724 return 0; 725 } 726 727 static DEF_SCSI_QCMD(uas_queuecommand) 728 729 /* 730 * For now we do not support actually sending an abort to the device, so 731 * this eh always fails. Still we must define it to make sure that we've 732 * dropped all references to the cmnd in question once this function exits. 733 */ 734 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) 735 { 736 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 737 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; 738 struct urb *data_in_urb = NULL; 739 struct urb *data_out_urb = NULL; 740 unsigned long flags; 741 742 spin_lock_irqsave(&devinfo->lock, flags); 743 744 uas_log_cmd_state(cmnd, __func__, 0); 745 746 /* Ensure that try_complete does not call scsi_done */ 747 cmdinfo->state |= COMMAND_ABORTED; 748 749 /* Drop all refs to this cmnd, kill data urbs to break their ref */ 750 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL; 751 if (cmdinfo->state & DATA_IN_URB_INFLIGHT) 752 data_in_urb = usb_get_urb(cmdinfo->data_in_urb); 753 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT) 754 data_out_urb = usb_get_urb(cmdinfo->data_out_urb); 755 756 uas_free_unsubmitted_urbs(cmnd); 757 758 spin_unlock_irqrestore(&devinfo->lock, flags); 759 760 if (data_in_urb) { 761 usb_kill_urb(data_in_urb); 762 usb_put_urb(data_in_urb); 763 } 764 if (data_out_urb) { 765 usb_kill_urb(data_out_urb); 766 usb_put_urb(data_out_urb); 767 } 768 769 return FAILED; 770 } 771 772 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd) 773 { 774 struct scsi_device *sdev = cmnd->device; 775 struct uas_dev_info *devinfo = sdev->hostdata; 776 struct usb_device *udev = devinfo->udev; 777 unsigned long flags; 778 int err; 779 780 err = usb_lock_device_for_reset(udev, devinfo->intf); 781 if (err) { 782 shost_printk(KERN_ERR, sdev->host, 783 "%s FAILED to get lock err %d\n", __func__, err); 784 return FAILED; 785 } 786 787 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__); 788 789 spin_lock_irqsave(&devinfo->lock, flags); 790 devinfo->resetting = 1; 791 spin_unlock_irqrestore(&devinfo->lock, flags); 792 793 usb_kill_anchored_urbs(&devinfo->cmd_urbs); 794 usb_kill_anchored_urbs(&devinfo->sense_urbs); 795 usb_kill_anchored_urbs(&devinfo->data_urbs); 796 uas_zap_pending(devinfo, DID_RESET); 797 798 err = usb_reset_device(udev); 799 800 spin_lock_irqsave(&devinfo->lock, flags); 801 devinfo->resetting = 0; 802 spin_unlock_irqrestore(&devinfo->lock, flags); 803 804 usb_unlock_device(udev); 805 806 if (err) { 807 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n", 808 __func__, err); 809 return FAILED; 810 } 811 812 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__); 813 return SUCCESS; 814 } 815 816 static int uas_target_alloc(struct scsi_target *starget) 817 { 818 struct uas_dev_info *devinfo = (struct uas_dev_info *) 819 dev_to_shost(starget->dev.parent)->hostdata; 820 821 if (devinfo->flags & US_FL_NO_REPORT_LUNS) 822 starget->no_report_luns = 1; 823 824 return 0; 825 } 826 827 static int uas_slave_alloc(struct scsi_device *sdev) 828 { 829 struct uas_dev_info *devinfo = 830 (struct uas_dev_info *)sdev->host->hostdata; 831 832 sdev->hostdata = devinfo; 833 834 /* 835 * The protocol has no requirements on alignment in the strict sense. 836 * Controllers may or may not have alignment restrictions. 837 * As this is not exported, we use an extremely conservative guess. 838 */ 839 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); 840 841 if (devinfo->flags & US_FL_MAX_SECTORS_64) 842 blk_queue_max_hw_sectors(sdev->request_queue, 64); 843 else if (devinfo->flags & US_FL_MAX_SECTORS_240) 844 blk_queue_max_hw_sectors(sdev->request_queue, 240); 845 846 return 0; 847 } 848 849 static int uas_slave_configure(struct scsi_device *sdev) 850 { 851 struct uas_dev_info *devinfo = sdev->hostdata; 852 853 if (devinfo->flags & US_FL_NO_REPORT_OPCODES) 854 sdev->no_report_opcodes = 1; 855 856 /* A few buggy USB-ATA bridges don't understand FUA */ 857 if (devinfo->flags & US_FL_BROKEN_FUA) 858 sdev->broken_fua = 1; 859 860 /* UAS also needs to support FL_ALWAYS_SYNC */ 861 if (devinfo->flags & US_FL_ALWAYS_SYNC) { 862 sdev->skip_ms_page_3f = 1; 863 sdev->skip_ms_page_8 = 1; 864 sdev->wce_default_on = 1; 865 } 866 867 /* Some disks cannot handle READ_CAPACITY_16 */ 868 if (devinfo->flags & US_FL_NO_READ_CAPACITY_16) 869 sdev->no_read_capacity_16 = 1; 870 871 /* Some disks cannot handle WRITE_SAME */ 872 if (devinfo->flags & US_FL_NO_SAME) 873 sdev->no_write_same = 1; 874 /* 875 * Some disks return the total number of blocks in response 876 * to READ CAPACITY rather than the highest block number. 877 * If this device makes that mistake, tell the sd driver. 878 */ 879 if (devinfo->flags & US_FL_FIX_CAPACITY) 880 sdev->fix_capacity = 1; 881 882 /* 883 * in some cases we have to guess 884 */ 885 if (devinfo->flags & US_FL_CAPACITY_HEURISTICS) 886 sdev->guess_capacity = 1; 887 888 /* 889 * Some devices don't like MODE SENSE with page=0x3f, 890 * which is the command used for checking if a device 891 * is write-protected. Now that we tell the sd driver 892 * to do a 192-byte transfer with this command the 893 * majority of devices work fine, but a few still can't 894 * handle it. The sd driver will simply assume those 895 * devices are write-enabled. 896 */ 897 if (devinfo->flags & US_FL_NO_WP_DETECT) 898 sdev->skip_ms_page_3f = 1; 899 900 scsi_change_queue_depth(sdev, devinfo->qdepth - 2); 901 return 0; 902 } 903 904 static struct scsi_host_template uas_host_template = { 905 .module = THIS_MODULE, 906 .name = "uas", 907 .queuecommand = uas_queuecommand, 908 .target_alloc = uas_target_alloc, 909 .slave_alloc = uas_slave_alloc, 910 .slave_configure = uas_slave_configure, 911 .eh_abort_handler = uas_eh_abort_handler, 912 .eh_device_reset_handler = uas_eh_device_reset_handler, 913 .this_id = -1, 914 .skip_settle_delay = 1, 915 .dma_boundary = PAGE_SIZE - 1, 916 }; 917 918 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ 919 vendorName, productName, useProtocol, useTransport, \ 920 initFunction, flags) \ 921 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \ 922 .driver_info = (flags) } 923 924 static struct usb_device_id uas_usb_ids[] = { 925 # include "unusual_uas.h" 926 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) }, 927 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) }, 928 { } 929 }; 930 MODULE_DEVICE_TABLE(usb, uas_usb_ids); 931 932 #undef UNUSUAL_DEV 933 934 static int uas_switch_interface(struct usb_device *udev, 935 struct usb_interface *intf) 936 { 937 struct usb_host_interface *alt; 938 939 alt = uas_find_uas_alt_setting(intf); 940 if (!alt) 941 return -ENODEV; 942 943 return usb_set_interface(udev, alt->desc.bInterfaceNumber, 944 alt->desc.bAlternateSetting); 945 } 946 947 static int uas_configure_endpoints(struct uas_dev_info *devinfo) 948 { 949 struct usb_host_endpoint *eps[4] = { }; 950 struct usb_device *udev = devinfo->udev; 951 int r; 952 953 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps); 954 if (r) 955 return r; 956 957 devinfo->cmd_pipe = usb_sndbulkpipe(udev, 958 usb_endpoint_num(&eps[0]->desc)); 959 devinfo->status_pipe = usb_rcvbulkpipe(udev, 960 usb_endpoint_num(&eps[1]->desc)); 961 devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 962 usb_endpoint_num(&eps[2]->desc)); 963 devinfo->data_out_pipe = usb_sndbulkpipe(udev, 964 usb_endpoint_num(&eps[3]->desc)); 965 966 if (udev->speed < USB_SPEED_SUPER) { 967 devinfo->qdepth = 32; 968 devinfo->use_streams = 0; 969 } else { 970 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 971 3, MAX_CMNDS, GFP_NOIO); 972 if (devinfo->qdepth < 0) 973 return devinfo->qdepth; 974 devinfo->use_streams = 1; 975 } 976 977 return 0; 978 } 979 980 static void uas_free_streams(struct uas_dev_info *devinfo) 981 { 982 struct usb_device *udev = devinfo->udev; 983 struct usb_host_endpoint *eps[3]; 984 985 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe); 986 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); 987 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); 988 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO); 989 } 990 991 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id) 992 { 993 int result = -ENOMEM; 994 struct Scsi_Host *shost = NULL; 995 struct uas_dev_info *devinfo; 996 struct usb_device *udev = interface_to_usbdev(intf); 997 unsigned long dev_flags; 998 999 if (!uas_use_uas_driver(intf, id, &dev_flags)) 1000 return -ENODEV; 1001 1002 if (uas_switch_interface(udev, intf)) 1003 return -ENODEV; 1004 1005 shost = scsi_host_alloc(&uas_host_template, 1006 sizeof(struct uas_dev_info)); 1007 if (!shost) 1008 goto set_alt0; 1009 1010 shost->max_cmd_len = 16 + 252; 1011 shost->max_id = 1; 1012 shost->max_lun = 256; 1013 shost->max_channel = 0; 1014 shost->sg_tablesize = udev->bus->sg_tablesize; 1015 1016 devinfo = (struct uas_dev_info *)shost->hostdata; 1017 devinfo->intf = intf; 1018 devinfo->udev = udev; 1019 devinfo->resetting = 0; 1020 devinfo->shutdown = 0; 1021 devinfo->flags = dev_flags; 1022 init_usb_anchor(&devinfo->cmd_urbs); 1023 init_usb_anchor(&devinfo->sense_urbs); 1024 init_usb_anchor(&devinfo->data_urbs); 1025 spin_lock_init(&devinfo->lock); 1026 INIT_WORK(&devinfo->work, uas_do_work); 1027 INIT_WORK(&devinfo->scan_work, uas_scan_work); 1028 1029 result = uas_configure_endpoints(devinfo); 1030 if (result) 1031 goto set_alt0; 1032 1033 /* 1034 * 1 tag is reserved for untagged commands + 1035 * 1 tag to avoid off by one errors in some bridge firmwares 1036 */ 1037 shost->can_queue = devinfo->qdepth - 2; 1038 1039 usb_set_intfdata(intf, shost); 1040 result = scsi_add_host(shost, &intf->dev); 1041 if (result) 1042 goto free_streams; 1043 1044 /* Submit the delayed_work for SCSI-device scanning */ 1045 schedule_work(&devinfo->scan_work); 1046 1047 return result; 1048 1049 free_streams: 1050 uas_free_streams(devinfo); 1051 usb_set_intfdata(intf, NULL); 1052 set_alt0: 1053 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0); 1054 if (shost) 1055 scsi_host_put(shost); 1056 return result; 1057 } 1058 1059 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo) 1060 { 1061 unsigned long flags; 1062 int i, r = 1; 1063 1064 spin_lock_irqsave(&devinfo->lock, flags); 1065 1066 for (i = 0; i < devinfo->qdepth; i++) { 1067 if (devinfo->cmnd[i]) { 1068 r = 0; /* Not empty */ 1069 break; 1070 } 1071 } 1072 1073 spin_unlock_irqrestore(&devinfo->lock, flags); 1074 1075 return r; 1076 } 1077 1078 /* 1079 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily 1080 * get empty while there still is more work to do due to sense-urbs completing 1081 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty. 1082 */ 1083 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo) 1084 { 1085 unsigned long start_time; 1086 int r; 1087 1088 start_time = jiffies; 1089 do { 1090 flush_work(&devinfo->work); 1091 1092 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000); 1093 if (r == 0) 1094 return -ETIME; 1095 1096 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500); 1097 if (r == 0) 1098 return -ETIME; 1099 1100 if (time_after(jiffies, start_time + 5 * HZ)) 1101 return -ETIME; 1102 } while (!uas_cmnd_list_empty(devinfo)); 1103 1104 return 0; 1105 } 1106 1107 static int uas_pre_reset(struct usb_interface *intf) 1108 { 1109 struct Scsi_Host *shost = usb_get_intfdata(intf); 1110 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1111 unsigned long flags; 1112 1113 if (devinfo->shutdown) 1114 return 0; 1115 1116 /* Block new requests */ 1117 spin_lock_irqsave(shost->host_lock, flags); 1118 scsi_block_requests(shost); 1119 spin_unlock_irqrestore(shost->host_lock, flags); 1120 1121 if (uas_wait_for_pending_cmnds(devinfo) != 0) { 1122 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__); 1123 scsi_unblock_requests(shost); 1124 return 1; 1125 } 1126 1127 uas_free_streams(devinfo); 1128 1129 return 0; 1130 } 1131 1132 static int uas_post_reset(struct usb_interface *intf) 1133 { 1134 struct Scsi_Host *shost = usb_get_intfdata(intf); 1135 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1136 unsigned long flags; 1137 int err; 1138 1139 if (devinfo->shutdown) 1140 return 0; 1141 1142 err = uas_configure_endpoints(devinfo); 1143 if (err && err != -ENODEV) 1144 shost_printk(KERN_ERR, shost, 1145 "%s: alloc streams error %d after reset", 1146 __func__, err); 1147 1148 /* we must unblock the host in every case lest we deadlock */ 1149 spin_lock_irqsave(shost->host_lock, flags); 1150 scsi_report_bus_reset(shost, 0); 1151 spin_unlock_irqrestore(shost->host_lock, flags); 1152 1153 scsi_unblock_requests(shost); 1154 1155 return err ? 1 : 0; 1156 } 1157 1158 static int uas_suspend(struct usb_interface *intf, pm_message_t message) 1159 { 1160 struct Scsi_Host *shost = usb_get_intfdata(intf); 1161 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1162 1163 if (uas_wait_for_pending_cmnds(devinfo) != 0) { 1164 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__); 1165 return -ETIME; 1166 } 1167 1168 return 0; 1169 } 1170 1171 static int uas_resume(struct usb_interface *intf) 1172 { 1173 return 0; 1174 } 1175 1176 static int uas_reset_resume(struct usb_interface *intf) 1177 { 1178 struct Scsi_Host *shost = usb_get_intfdata(intf); 1179 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1180 unsigned long flags; 1181 int err; 1182 1183 err = uas_configure_endpoints(devinfo); 1184 if (err) { 1185 shost_printk(KERN_ERR, shost, 1186 "%s: alloc streams error %d after reset", 1187 __func__, err); 1188 return -EIO; 1189 } 1190 1191 spin_lock_irqsave(shost->host_lock, flags); 1192 scsi_report_bus_reset(shost, 0); 1193 spin_unlock_irqrestore(shost->host_lock, flags); 1194 1195 return 0; 1196 } 1197 1198 static void uas_disconnect(struct usb_interface *intf) 1199 { 1200 struct Scsi_Host *shost = usb_get_intfdata(intf); 1201 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1202 unsigned long flags; 1203 1204 spin_lock_irqsave(&devinfo->lock, flags); 1205 devinfo->resetting = 1; 1206 spin_unlock_irqrestore(&devinfo->lock, flags); 1207 1208 cancel_work_sync(&devinfo->work); 1209 usb_kill_anchored_urbs(&devinfo->cmd_urbs); 1210 usb_kill_anchored_urbs(&devinfo->sense_urbs); 1211 usb_kill_anchored_urbs(&devinfo->data_urbs); 1212 uas_zap_pending(devinfo, DID_NO_CONNECT); 1213 1214 /* 1215 * Prevent SCSI scanning (if it hasn't started yet) 1216 * or wait for the SCSI-scanning routine to stop. 1217 */ 1218 cancel_work_sync(&devinfo->scan_work); 1219 1220 scsi_remove_host(shost); 1221 uas_free_streams(devinfo); 1222 scsi_host_put(shost); 1223 } 1224 1225 /* 1226 * Put the device back in usb-storage mode on shutdown, as some BIOS-es 1227 * hang on reboot when the device is still in uas mode. Note the reset is 1228 * necessary as some devices won't revert to usb-storage mode without it. 1229 */ 1230 static void uas_shutdown(struct device *dev) 1231 { 1232 struct usb_interface *intf = to_usb_interface(dev); 1233 struct usb_device *udev = interface_to_usbdev(intf); 1234 struct Scsi_Host *shost = usb_get_intfdata(intf); 1235 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1236 1237 if (system_state != SYSTEM_RESTART) 1238 return; 1239 1240 devinfo->shutdown = 1; 1241 uas_free_streams(devinfo); 1242 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0); 1243 usb_reset_device(udev); 1244 } 1245 1246 static struct usb_driver uas_driver = { 1247 .name = "uas", 1248 .probe = uas_probe, 1249 .disconnect = uas_disconnect, 1250 .pre_reset = uas_pre_reset, 1251 .post_reset = uas_post_reset, 1252 .suspend = uas_suspend, 1253 .resume = uas_resume, 1254 .reset_resume = uas_reset_resume, 1255 .drvwrap.driver.shutdown = uas_shutdown, 1256 .id_table = uas_usb_ids, 1257 }; 1258 1259 static int __init uas_init(void) 1260 { 1261 int rv; 1262 1263 workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0); 1264 if (!workqueue) 1265 return -ENOMEM; 1266 1267 rv = usb_register(&uas_driver); 1268 if (rv) { 1269 destroy_workqueue(workqueue); 1270 return -ENOMEM; 1271 } 1272 1273 return 0; 1274 } 1275 1276 static void __exit uas_exit(void) 1277 { 1278 usb_deregister(&uas_driver); 1279 destroy_workqueue(workqueue); 1280 } 1281 1282 module_init(uas_init); 1283 module_exit(uas_exit); 1284 1285 MODULE_LICENSE("GPL"); 1286 MODULE_IMPORT_NS(USB_STORAGE); 1287 MODULE_AUTHOR( 1288 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp"); 1289