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