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 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 { 638 struct scsi_device *sdev = cmnd->device; 639 struct uas_dev_info *devinfo = sdev->hostdata; 640 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 641 unsigned long flags; 642 int idx, err; 643 644 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer)); 645 646 /* Re-check scsi_block_requests now that we've the host-lock */ 647 if (cmnd->device->host->host_self_blocked) 648 return SCSI_MLQUEUE_DEVICE_BUSY; 649 650 if ((devinfo->flags & US_FL_NO_ATA_1X) && 651 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) { 652 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB, 653 sizeof(usb_stor_sense_invalidCDB)); 654 cmnd->result = SAM_STAT_CHECK_CONDITION; 655 scsi_done(cmnd); 656 return 0; 657 } 658 659 spin_lock_irqsave(&devinfo->lock, flags); 660 661 if (devinfo->resetting) { 662 set_host_byte(cmnd, DID_ERROR); 663 scsi_done(cmnd); 664 goto zombie; 665 } 666 667 /* Find a free uas-tag */ 668 for (idx = 0; idx < devinfo->qdepth; idx++) { 669 if (!devinfo->cmnd[idx]) 670 break; 671 } 672 if (idx == devinfo->qdepth) { 673 spin_unlock_irqrestore(&devinfo->lock, flags); 674 return SCSI_MLQUEUE_DEVICE_BUSY; 675 } 676 677 memset(cmdinfo, 0, sizeof(*cmdinfo)); 678 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */ 679 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB; 680 681 switch (cmnd->sc_data_direction) { 682 case DMA_FROM_DEVICE: 683 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; 684 break; 685 case DMA_BIDIRECTIONAL: 686 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; 687 fallthrough; 688 case DMA_TO_DEVICE: 689 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB; 690 break; 691 case DMA_NONE: 692 break; 693 } 694 695 if (!devinfo->use_streams) 696 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB); 697 698 err = uas_submit_urbs(cmnd, devinfo); 699 /* 700 * in case of fatal errors the SCSI layer is peculiar 701 * a command that has finished is a success for the purpose 702 * of queueing, no matter how fatal the error 703 */ 704 if (err == -ENODEV) { 705 set_host_byte(cmnd, DID_ERROR); 706 scsi_done(cmnd); 707 goto zombie; 708 } 709 if (err) { 710 /* If we did nothing, give up now */ 711 if (cmdinfo->state & SUBMIT_STATUS_URB) { 712 spin_unlock_irqrestore(&devinfo->lock, flags); 713 return SCSI_MLQUEUE_DEVICE_BUSY; 714 } 715 uas_add_work(cmdinfo); 716 } 717 718 devinfo->cmnd[idx] = cmnd; 719 zombie: 720 spin_unlock_irqrestore(&devinfo->lock, flags); 721 return 0; 722 } 723 724 static DEF_SCSI_QCMD(uas_queuecommand) 725 726 /* 727 * For now we do not support actually sending an abort to the device, so 728 * this eh always fails. Still we must define it to make sure that we've 729 * dropped all references to the cmnd in question once this function exits. 730 */ 731 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) 732 { 733 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 734 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; 735 struct urb *data_in_urb = NULL; 736 struct urb *data_out_urb = NULL; 737 unsigned long flags; 738 739 spin_lock_irqsave(&devinfo->lock, flags); 740 741 uas_log_cmd_state(cmnd, __func__, 0); 742 743 /* Ensure that try_complete does not call scsi_done */ 744 cmdinfo->state |= COMMAND_ABORTED; 745 746 /* Drop all refs to this cmnd, kill data urbs to break their ref */ 747 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL; 748 if (cmdinfo->state & DATA_IN_URB_INFLIGHT) 749 data_in_urb = usb_get_urb(cmdinfo->data_in_urb); 750 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT) 751 data_out_urb = usb_get_urb(cmdinfo->data_out_urb); 752 753 uas_free_unsubmitted_urbs(cmnd); 754 755 spin_unlock_irqrestore(&devinfo->lock, flags); 756 757 if (data_in_urb) { 758 usb_kill_urb(data_in_urb); 759 usb_put_urb(data_in_urb); 760 } 761 if (data_out_urb) { 762 usb_kill_urb(data_out_urb); 763 usb_put_urb(data_out_urb); 764 } 765 766 return FAILED; 767 } 768 769 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd) 770 { 771 struct scsi_device *sdev = cmnd->device; 772 struct uas_dev_info *devinfo = sdev->hostdata; 773 struct usb_device *udev = devinfo->udev; 774 unsigned long flags; 775 int err; 776 777 err = usb_lock_device_for_reset(udev, devinfo->intf); 778 if (err) { 779 shost_printk(KERN_ERR, sdev->host, 780 "%s FAILED to get lock err %d\n", __func__, err); 781 return FAILED; 782 } 783 784 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__); 785 786 spin_lock_irqsave(&devinfo->lock, flags); 787 devinfo->resetting = 1; 788 spin_unlock_irqrestore(&devinfo->lock, flags); 789 790 usb_kill_anchored_urbs(&devinfo->cmd_urbs); 791 usb_kill_anchored_urbs(&devinfo->sense_urbs); 792 usb_kill_anchored_urbs(&devinfo->data_urbs); 793 uas_zap_pending(devinfo, DID_RESET); 794 795 err = usb_reset_device(udev); 796 797 spin_lock_irqsave(&devinfo->lock, flags); 798 devinfo->resetting = 0; 799 spin_unlock_irqrestore(&devinfo->lock, flags); 800 801 usb_unlock_device(udev); 802 803 if (err) { 804 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n", 805 __func__, err); 806 return FAILED; 807 } 808 809 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__); 810 return SUCCESS; 811 } 812 813 static int uas_target_alloc(struct scsi_target *starget) 814 { 815 struct uas_dev_info *devinfo = (struct uas_dev_info *) 816 dev_to_shost(starget->dev.parent)->hostdata; 817 818 if (devinfo->flags & US_FL_NO_REPORT_LUNS) 819 starget->no_report_luns = 1; 820 821 return 0; 822 } 823 824 static int uas_slave_alloc(struct scsi_device *sdev) 825 { 826 struct uas_dev_info *devinfo = 827 (struct uas_dev_info *)sdev->host->hostdata; 828 829 sdev->hostdata = devinfo; 830 831 /* 832 * The protocol has no requirements on alignment in the strict sense. 833 * Controllers may or may not have alignment restrictions. 834 * As this is not exported, we use an extremely conservative guess. 835 */ 836 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); 837 838 if (devinfo->flags & US_FL_MAX_SECTORS_64) 839 blk_queue_max_hw_sectors(sdev->request_queue, 64); 840 else if (devinfo->flags & US_FL_MAX_SECTORS_240) 841 blk_queue_max_hw_sectors(sdev->request_queue, 240); 842 843 return 0; 844 } 845 846 static int uas_slave_configure(struct scsi_device *sdev) 847 { 848 struct uas_dev_info *devinfo = sdev->hostdata; 849 850 if (devinfo->flags & US_FL_NO_REPORT_OPCODES) 851 sdev->no_report_opcodes = 1; 852 853 /* A few buggy USB-ATA bridges don't understand FUA */ 854 if (devinfo->flags & US_FL_BROKEN_FUA) 855 sdev->broken_fua = 1; 856 857 /* UAS also needs to support FL_ALWAYS_SYNC */ 858 if (devinfo->flags & US_FL_ALWAYS_SYNC) { 859 sdev->skip_ms_page_3f = 1; 860 sdev->skip_ms_page_8 = 1; 861 sdev->wce_default_on = 1; 862 } 863 864 /* Some disks cannot handle READ_CAPACITY_16 */ 865 if (devinfo->flags & US_FL_NO_READ_CAPACITY_16) 866 sdev->no_read_capacity_16 = 1; 867 868 /* Some disks cannot handle WRITE_SAME */ 869 if (devinfo->flags & US_FL_NO_SAME) 870 sdev->no_write_same = 1; 871 /* 872 * Some disks return the total number of blocks in response 873 * to READ CAPACITY rather than the highest block number. 874 * If this device makes that mistake, tell the sd driver. 875 */ 876 if (devinfo->flags & US_FL_FIX_CAPACITY) 877 sdev->fix_capacity = 1; 878 879 /* 880 * in some cases we have to guess 881 */ 882 if (devinfo->flags & US_FL_CAPACITY_HEURISTICS) 883 sdev->guess_capacity = 1; 884 885 /* 886 * Some devices don't like MODE SENSE with page=0x3f, 887 * which is the command used for checking if a device 888 * is write-protected. Now that we tell the sd driver 889 * to do a 192-byte transfer with this command the 890 * majority of devices work fine, but a few still can't 891 * handle it. The sd driver will simply assume those 892 * devices are write-enabled. 893 */ 894 if (devinfo->flags & US_FL_NO_WP_DETECT) 895 sdev->skip_ms_page_3f = 1; 896 897 scsi_change_queue_depth(sdev, devinfo->qdepth - 2); 898 return 0; 899 } 900 901 static struct scsi_host_template uas_host_template = { 902 .module = THIS_MODULE, 903 .name = "uas", 904 .queuecommand = uas_queuecommand, 905 .target_alloc = uas_target_alloc, 906 .slave_alloc = uas_slave_alloc, 907 .slave_configure = uas_slave_configure, 908 .eh_abort_handler = uas_eh_abort_handler, 909 .eh_device_reset_handler = uas_eh_device_reset_handler, 910 .this_id = -1, 911 .skip_settle_delay = 1, 912 .dma_boundary = PAGE_SIZE - 1, 913 }; 914 915 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ 916 vendorName, productName, useProtocol, useTransport, \ 917 initFunction, flags) \ 918 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \ 919 .driver_info = (flags) } 920 921 static struct usb_device_id uas_usb_ids[] = { 922 # include "unusual_uas.h" 923 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) }, 924 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) }, 925 { } 926 }; 927 MODULE_DEVICE_TABLE(usb, uas_usb_ids); 928 929 #undef UNUSUAL_DEV 930 931 static int uas_switch_interface(struct usb_device *udev, 932 struct usb_interface *intf) 933 { 934 struct usb_host_interface *alt; 935 936 alt = uas_find_uas_alt_setting(intf); 937 if (!alt) 938 return -ENODEV; 939 940 return usb_set_interface(udev, alt->desc.bInterfaceNumber, 941 alt->desc.bAlternateSetting); 942 } 943 944 static int uas_configure_endpoints(struct uas_dev_info *devinfo) 945 { 946 struct usb_host_endpoint *eps[4] = { }; 947 struct usb_device *udev = devinfo->udev; 948 int r; 949 950 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps); 951 if (r) 952 return r; 953 954 devinfo->cmd_pipe = usb_sndbulkpipe(udev, 955 usb_endpoint_num(&eps[0]->desc)); 956 devinfo->status_pipe = usb_rcvbulkpipe(udev, 957 usb_endpoint_num(&eps[1]->desc)); 958 devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 959 usb_endpoint_num(&eps[2]->desc)); 960 devinfo->data_out_pipe = usb_sndbulkpipe(udev, 961 usb_endpoint_num(&eps[3]->desc)); 962 963 if (udev->speed < USB_SPEED_SUPER) { 964 devinfo->qdepth = 32; 965 devinfo->use_streams = 0; 966 } else { 967 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 968 3, MAX_CMNDS, GFP_NOIO); 969 if (devinfo->qdepth < 0) 970 return devinfo->qdepth; 971 devinfo->use_streams = 1; 972 } 973 974 return 0; 975 } 976 977 static void uas_free_streams(struct uas_dev_info *devinfo) 978 { 979 struct usb_device *udev = devinfo->udev; 980 struct usb_host_endpoint *eps[3]; 981 982 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe); 983 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); 984 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); 985 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO); 986 } 987 988 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id) 989 { 990 int result = -ENOMEM; 991 struct Scsi_Host *shost = NULL; 992 struct uas_dev_info *devinfo; 993 struct usb_device *udev = interface_to_usbdev(intf); 994 unsigned long dev_flags; 995 996 if (!uas_use_uas_driver(intf, id, &dev_flags)) 997 return -ENODEV; 998 999 if (uas_switch_interface(udev, intf)) 1000 return -ENODEV; 1001 1002 shost = scsi_host_alloc(&uas_host_template, 1003 sizeof(struct uas_dev_info)); 1004 if (!shost) 1005 goto set_alt0; 1006 1007 shost->max_cmd_len = 16 + 252; 1008 shost->max_id = 1; 1009 shost->max_lun = 256; 1010 shost->max_channel = 0; 1011 shost->sg_tablesize = udev->bus->sg_tablesize; 1012 1013 devinfo = (struct uas_dev_info *)shost->hostdata; 1014 devinfo->intf = intf; 1015 devinfo->udev = udev; 1016 devinfo->resetting = 0; 1017 devinfo->shutdown = 0; 1018 devinfo->flags = dev_flags; 1019 init_usb_anchor(&devinfo->cmd_urbs); 1020 init_usb_anchor(&devinfo->sense_urbs); 1021 init_usb_anchor(&devinfo->data_urbs); 1022 spin_lock_init(&devinfo->lock); 1023 INIT_WORK(&devinfo->work, uas_do_work); 1024 INIT_WORK(&devinfo->scan_work, uas_scan_work); 1025 1026 result = uas_configure_endpoints(devinfo); 1027 if (result) 1028 goto set_alt0; 1029 1030 /* 1031 * 1 tag is reserved for untagged commands + 1032 * 1 tag to avoid off by one errors in some bridge firmwares 1033 */ 1034 shost->can_queue = devinfo->qdepth - 2; 1035 1036 usb_set_intfdata(intf, shost); 1037 result = scsi_add_host(shost, &intf->dev); 1038 if (result) 1039 goto free_streams; 1040 1041 /* Submit the delayed_work for SCSI-device scanning */ 1042 schedule_work(&devinfo->scan_work); 1043 1044 return result; 1045 1046 free_streams: 1047 uas_free_streams(devinfo); 1048 usb_set_intfdata(intf, NULL); 1049 set_alt0: 1050 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0); 1051 if (shost) 1052 scsi_host_put(shost); 1053 return result; 1054 } 1055 1056 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo) 1057 { 1058 unsigned long flags; 1059 int i, r = 1; 1060 1061 spin_lock_irqsave(&devinfo->lock, flags); 1062 1063 for (i = 0; i < devinfo->qdepth; i++) { 1064 if (devinfo->cmnd[i]) { 1065 r = 0; /* Not empty */ 1066 break; 1067 } 1068 } 1069 1070 spin_unlock_irqrestore(&devinfo->lock, flags); 1071 1072 return r; 1073 } 1074 1075 /* 1076 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily 1077 * get empty while there still is more work to do due to sense-urbs completing 1078 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty. 1079 */ 1080 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo) 1081 { 1082 unsigned long start_time; 1083 int r; 1084 1085 start_time = jiffies; 1086 do { 1087 flush_work(&devinfo->work); 1088 1089 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000); 1090 if (r == 0) 1091 return -ETIME; 1092 1093 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500); 1094 if (r == 0) 1095 return -ETIME; 1096 1097 if (time_after(jiffies, start_time + 5 * HZ)) 1098 return -ETIME; 1099 } while (!uas_cmnd_list_empty(devinfo)); 1100 1101 return 0; 1102 } 1103 1104 static int uas_pre_reset(struct usb_interface *intf) 1105 { 1106 struct Scsi_Host *shost = usb_get_intfdata(intf); 1107 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1108 unsigned long flags; 1109 1110 if (devinfo->shutdown) 1111 return 0; 1112 1113 /* Block new requests */ 1114 spin_lock_irqsave(shost->host_lock, flags); 1115 scsi_block_requests(shost); 1116 spin_unlock_irqrestore(shost->host_lock, flags); 1117 1118 if (uas_wait_for_pending_cmnds(devinfo) != 0) { 1119 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__); 1120 scsi_unblock_requests(shost); 1121 return 1; 1122 } 1123 1124 uas_free_streams(devinfo); 1125 1126 return 0; 1127 } 1128 1129 static int uas_post_reset(struct usb_interface *intf) 1130 { 1131 struct Scsi_Host *shost = usb_get_intfdata(intf); 1132 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1133 unsigned long flags; 1134 int err; 1135 1136 if (devinfo->shutdown) 1137 return 0; 1138 1139 err = uas_configure_endpoints(devinfo); 1140 if (err && err != -ENODEV) 1141 shost_printk(KERN_ERR, shost, 1142 "%s: alloc streams error %d after reset", 1143 __func__, err); 1144 1145 /* we must unblock the host in every case lest we deadlock */ 1146 spin_lock_irqsave(shost->host_lock, flags); 1147 scsi_report_bus_reset(shost, 0); 1148 spin_unlock_irqrestore(shost->host_lock, flags); 1149 1150 scsi_unblock_requests(shost); 1151 1152 return err ? 1 : 0; 1153 } 1154 1155 static int uas_suspend(struct usb_interface *intf, pm_message_t message) 1156 { 1157 struct Scsi_Host *shost = usb_get_intfdata(intf); 1158 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1159 1160 if (uas_wait_for_pending_cmnds(devinfo) != 0) { 1161 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__); 1162 return -ETIME; 1163 } 1164 1165 return 0; 1166 } 1167 1168 static int uas_resume(struct usb_interface *intf) 1169 { 1170 return 0; 1171 } 1172 1173 static int uas_reset_resume(struct usb_interface *intf) 1174 { 1175 struct Scsi_Host *shost = usb_get_intfdata(intf); 1176 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1177 unsigned long flags; 1178 int err; 1179 1180 err = uas_configure_endpoints(devinfo); 1181 if (err) { 1182 shost_printk(KERN_ERR, shost, 1183 "%s: alloc streams error %d after reset", 1184 __func__, err); 1185 return -EIO; 1186 } 1187 1188 spin_lock_irqsave(shost->host_lock, flags); 1189 scsi_report_bus_reset(shost, 0); 1190 spin_unlock_irqrestore(shost->host_lock, flags); 1191 1192 return 0; 1193 } 1194 1195 static void uas_disconnect(struct usb_interface *intf) 1196 { 1197 struct Scsi_Host *shost = usb_get_intfdata(intf); 1198 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1199 unsigned long flags; 1200 1201 spin_lock_irqsave(&devinfo->lock, flags); 1202 devinfo->resetting = 1; 1203 spin_unlock_irqrestore(&devinfo->lock, flags); 1204 1205 cancel_work_sync(&devinfo->work); 1206 usb_kill_anchored_urbs(&devinfo->cmd_urbs); 1207 usb_kill_anchored_urbs(&devinfo->sense_urbs); 1208 usb_kill_anchored_urbs(&devinfo->data_urbs); 1209 uas_zap_pending(devinfo, DID_NO_CONNECT); 1210 1211 /* 1212 * Prevent SCSI scanning (if it hasn't started yet) 1213 * or wait for the SCSI-scanning routine to stop. 1214 */ 1215 cancel_work_sync(&devinfo->scan_work); 1216 1217 scsi_remove_host(shost); 1218 uas_free_streams(devinfo); 1219 scsi_host_put(shost); 1220 } 1221 1222 /* 1223 * Put the device back in usb-storage mode on shutdown, as some BIOS-es 1224 * hang on reboot when the device is still in uas mode. Note the reset is 1225 * necessary as some devices won't revert to usb-storage mode without it. 1226 */ 1227 static void uas_shutdown(struct device *dev) 1228 { 1229 struct usb_interface *intf = to_usb_interface(dev); 1230 struct usb_device *udev = interface_to_usbdev(intf); 1231 struct Scsi_Host *shost = usb_get_intfdata(intf); 1232 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1233 1234 if (system_state != SYSTEM_RESTART) 1235 return; 1236 1237 devinfo->shutdown = 1; 1238 uas_free_streams(devinfo); 1239 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0); 1240 usb_reset_device(udev); 1241 } 1242 1243 static struct usb_driver uas_driver = { 1244 .name = "uas", 1245 .probe = uas_probe, 1246 .disconnect = uas_disconnect, 1247 .pre_reset = uas_pre_reset, 1248 .post_reset = uas_post_reset, 1249 .suspend = uas_suspend, 1250 .resume = uas_resume, 1251 .reset_resume = uas_reset_resume, 1252 .drvwrap.driver.shutdown = uas_shutdown, 1253 .id_table = uas_usb_ids, 1254 }; 1255 1256 static int __init uas_init(void) 1257 { 1258 int rv; 1259 1260 workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0); 1261 if (!workqueue) 1262 return -ENOMEM; 1263 1264 rv = usb_register(&uas_driver); 1265 if (rv) { 1266 destroy_workqueue(workqueue); 1267 return -ENOMEM; 1268 } 1269 1270 return 0; 1271 } 1272 1273 static void __exit uas_exit(void) 1274 { 1275 usb_deregister(&uas_driver); 1276 destroy_workqueue(workqueue); 1277 } 1278 1279 module_init(uas_init); 1280 module_exit(uas_exit); 1281 1282 MODULE_LICENSE("GPL"); 1283 MODULE_IMPORT_NS(USB_STORAGE); 1284 MODULE_AUTHOR( 1285 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp"); 1286