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 set_host_byte(cmnd, DID_ERROR); 426 } else { 427 scsi_set_resid(cmnd, sdb->length - urb->actual_length); 428 } 429 uas_try_complete(cmnd, __func__); 430 out: 431 usb_free_urb(urb); 432 spin_unlock_irqrestore(&devinfo->lock, flags); 433 } 434 435 static void uas_cmd_cmplt(struct urb *urb) 436 { 437 if (urb->status) 438 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status); 439 440 usb_free_urb(urb); 441 } 442 443 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp, 444 struct scsi_cmnd *cmnd, 445 enum dma_data_direction dir) 446 { 447 struct usb_device *udev = devinfo->udev; 448 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd); 449 struct urb *urb = usb_alloc_urb(0, gfp); 450 struct scsi_data_buffer *sdb = &cmnd->sdb; 451 unsigned int pipe = (dir == DMA_FROM_DEVICE) 452 ? devinfo->data_in_pipe : devinfo->data_out_pipe; 453 454 if (!urb) 455 goto out; 456 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, 457 uas_data_cmplt, cmnd); 458 if (devinfo->use_streams) 459 urb->stream_id = cmdinfo->uas_tag; 460 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0; 461 urb->sg = sdb->table.sgl; 462 out: 463 return urb; 464 } 465 466 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp, 467 struct scsi_cmnd *cmnd) 468 { 469 struct usb_device *udev = devinfo->udev; 470 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd); 471 struct urb *urb = usb_alloc_urb(0, gfp); 472 struct sense_iu *iu; 473 474 if (!urb) 475 goto out; 476 477 iu = kzalloc(sizeof(*iu), gfp); 478 if (!iu) 479 goto free; 480 481 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu), 482 uas_stat_cmplt, cmnd->device->host); 483 if (devinfo->use_streams) 484 urb->stream_id = cmdinfo->uas_tag; 485 urb->transfer_flags |= URB_FREE_BUFFER; 486 out: 487 return urb; 488 free: 489 usb_free_urb(urb); 490 return NULL; 491 } 492 493 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp, 494 struct scsi_cmnd *cmnd) 495 { 496 struct usb_device *udev = devinfo->udev; 497 struct scsi_device *sdev = cmnd->device; 498 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd); 499 struct urb *urb = usb_alloc_urb(0, gfp); 500 struct command_iu *iu; 501 int len; 502 503 if (!urb) 504 goto out; 505 506 len = cmnd->cmd_len - 16; 507 if (len < 0) 508 len = 0; 509 len = ALIGN(len, 4); 510 iu = kzalloc(sizeof(*iu) + len, gfp); 511 if (!iu) 512 goto free; 513 514 iu->iu_id = IU_ID_COMMAND; 515 iu->tag = cpu_to_be16(cmdinfo->uas_tag); 516 iu->prio_attr = UAS_SIMPLE_TAG; 517 iu->len = len; 518 int_to_scsilun(sdev->lun, &iu->lun); 519 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len); 520 521 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len, 522 uas_cmd_cmplt, NULL); 523 urb->transfer_flags |= URB_FREE_BUFFER; 524 out: 525 return urb; 526 free: 527 usb_free_urb(urb); 528 return NULL; 529 } 530 531 /* 532 * Why should I request the Status IU before sending the Command IU? Spec 533 * says to, but also says the device may receive them in any order. Seems 534 * daft to me. 535 */ 536 537 static int uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp) 538 { 539 struct uas_dev_info *devinfo = cmnd->device->hostdata; 540 struct urb *urb; 541 int err; 542 543 urb = uas_alloc_sense_urb(devinfo, gfp, cmnd); 544 if (!urb) 545 return -ENOMEM; 546 usb_anchor_urb(urb, &devinfo->sense_urbs); 547 err = usb_submit_urb(urb, gfp); 548 if (err) { 549 usb_unanchor_urb(urb); 550 uas_log_cmd_state(cmnd, "sense submit err", err); 551 usb_free_urb(urb); 552 } 553 return err; 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 int err; 561 562 lockdep_assert_held(&devinfo->lock); 563 if (cmdinfo->state & SUBMIT_STATUS_URB) { 564 err = uas_submit_sense_urb(cmnd, GFP_ATOMIC); 565 if (err) 566 return err; 567 cmdinfo->state &= ~SUBMIT_STATUS_URB; 568 } 569 570 if (cmdinfo->state & ALLOC_DATA_IN_URB) { 571 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC, 572 cmnd, DMA_FROM_DEVICE); 573 if (!cmdinfo->data_in_urb) 574 return -ENOMEM; 575 cmdinfo->state &= ~ALLOC_DATA_IN_URB; 576 } 577 578 if (cmdinfo->state & SUBMIT_DATA_IN_URB) { 579 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs); 580 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC); 581 if (err) { 582 usb_unanchor_urb(cmdinfo->data_in_urb); 583 uas_log_cmd_state(cmnd, "data in submit err", err); 584 return err; 585 } 586 cmdinfo->state &= ~SUBMIT_DATA_IN_URB; 587 cmdinfo->state |= DATA_IN_URB_INFLIGHT; 588 } 589 590 if (cmdinfo->state & ALLOC_DATA_OUT_URB) { 591 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC, 592 cmnd, DMA_TO_DEVICE); 593 if (!cmdinfo->data_out_urb) 594 return -ENOMEM; 595 cmdinfo->state &= ~ALLOC_DATA_OUT_URB; 596 } 597 598 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) { 599 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs); 600 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC); 601 if (err) { 602 usb_unanchor_urb(cmdinfo->data_out_urb); 603 uas_log_cmd_state(cmnd, "data out submit err", err); 604 return err; 605 } 606 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB; 607 cmdinfo->state |= DATA_OUT_URB_INFLIGHT; 608 } 609 610 if (cmdinfo->state & ALLOC_CMD_URB) { 611 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd); 612 if (!cmdinfo->cmd_urb) 613 return -ENOMEM; 614 cmdinfo->state &= ~ALLOC_CMD_URB; 615 } 616 617 if (cmdinfo->state & SUBMIT_CMD_URB) { 618 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs); 619 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC); 620 if (err) { 621 usb_unanchor_urb(cmdinfo->cmd_urb); 622 uas_log_cmd_state(cmnd, "cmd submit err", err); 623 return err; 624 } 625 cmdinfo->cmd_urb = NULL; 626 cmdinfo->state &= ~SUBMIT_CMD_URB; 627 cmdinfo->state |= COMMAND_INFLIGHT; 628 } 629 630 return 0; 631 } 632 633 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd) 634 { 635 struct scsi_device *sdev = cmnd->device; 636 struct uas_dev_info *devinfo = sdev->hostdata; 637 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd); 638 unsigned long flags; 639 int idx, err; 640 641 /* Re-check scsi_block_requests now that we've the host-lock */ 642 if (cmnd->device->host->host_self_blocked) 643 return SCSI_MLQUEUE_DEVICE_BUSY; 644 645 if ((devinfo->flags & US_FL_NO_ATA_1X) && 646 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) { 647 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB, 648 sizeof(usb_stor_sense_invalidCDB)); 649 cmnd->result = SAM_STAT_CHECK_CONDITION; 650 scsi_done(cmnd); 651 return 0; 652 } 653 654 spin_lock_irqsave(&devinfo->lock, flags); 655 656 if (devinfo->resetting) { 657 set_host_byte(cmnd, DID_ERROR); 658 scsi_done(cmnd); 659 goto zombie; 660 } 661 662 /* Find a free uas-tag */ 663 for (idx = 0; idx < devinfo->qdepth; idx++) { 664 if (!devinfo->cmnd[idx]) 665 break; 666 } 667 if (idx == devinfo->qdepth) { 668 spin_unlock_irqrestore(&devinfo->lock, flags); 669 return SCSI_MLQUEUE_DEVICE_BUSY; 670 } 671 672 memset(cmdinfo, 0, sizeof(*cmdinfo)); 673 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */ 674 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB; 675 676 switch (cmnd->sc_data_direction) { 677 case DMA_FROM_DEVICE: 678 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; 679 break; 680 case DMA_BIDIRECTIONAL: 681 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; 682 fallthrough; 683 case DMA_TO_DEVICE: 684 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB; 685 break; 686 case DMA_NONE: 687 break; 688 } 689 690 if (!devinfo->use_streams) 691 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB); 692 693 err = uas_submit_urbs(cmnd, devinfo); 694 /* 695 * in case of fatal errors the SCSI layer is peculiar 696 * a command that has finished is a success for the purpose 697 * of queueing, no matter how fatal the error 698 */ 699 if (err == -ENODEV) { 700 set_host_byte(cmnd, DID_NO_CONNECT); 701 scsi_done(cmnd); 702 goto zombie; 703 } 704 if (err) { 705 /* If we did nothing, give up now */ 706 if (cmdinfo->state & SUBMIT_STATUS_URB) { 707 spin_unlock_irqrestore(&devinfo->lock, flags); 708 return SCSI_MLQUEUE_DEVICE_BUSY; 709 } 710 uas_add_work(cmnd); 711 } 712 713 devinfo->cmnd[idx] = cmnd; 714 zombie: 715 spin_unlock_irqrestore(&devinfo->lock, flags); 716 return 0; 717 } 718 719 static DEF_SCSI_QCMD(uas_queuecommand) 720 721 /* 722 * For now we do not support actually sending an abort to the device, so 723 * this eh always fails. Still we must define it to make sure that we've 724 * dropped all references to the cmnd in question once this function exits. 725 */ 726 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) 727 { 728 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd); 729 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; 730 struct urb *data_in_urb = NULL; 731 struct urb *data_out_urb = NULL; 732 unsigned long flags; 733 734 spin_lock_irqsave(&devinfo->lock, flags); 735 736 uas_log_cmd_state(cmnd, __func__, 0); 737 738 /* Ensure that try_complete does not call scsi_done */ 739 cmdinfo->state |= COMMAND_ABORTED; 740 741 /* Drop all refs to this cmnd, kill data urbs to break their ref */ 742 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL; 743 if (cmdinfo->state & DATA_IN_URB_INFLIGHT) 744 data_in_urb = usb_get_urb(cmdinfo->data_in_urb); 745 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT) 746 data_out_urb = usb_get_urb(cmdinfo->data_out_urb); 747 748 uas_free_unsubmitted_urbs(cmnd); 749 750 spin_unlock_irqrestore(&devinfo->lock, flags); 751 752 if (data_in_urb) { 753 usb_kill_urb(data_in_urb); 754 usb_put_urb(data_in_urb); 755 } 756 if (data_out_urb) { 757 usb_kill_urb(data_out_urb); 758 usb_put_urb(data_out_urb); 759 } 760 761 return FAILED; 762 } 763 764 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd) 765 { 766 struct scsi_device *sdev = cmnd->device; 767 struct uas_dev_info *devinfo = sdev->hostdata; 768 struct usb_device *udev = devinfo->udev; 769 unsigned long flags; 770 int err; 771 772 err = usb_lock_device_for_reset(udev, devinfo->intf); 773 if (err) { 774 shost_printk(KERN_ERR, sdev->host, 775 "%s FAILED to get lock err %d\n", __func__, err); 776 return FAILED; 777 } 778 779 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__); 780 781 spin_lock_irqsave(&devinfo->lock, flags); 782 devinfo->resetting = 1; 783 spin_unlock_irqrestore(&devinfo->lock, flags); 784 785 usb_kill_anchored_urbs(&devinfo->cmd_urbs); 786 usb_kill_anchored_urbs(&devinfo->sense_urbs); 787 usb_kill_anchored_urbs(&devinfo->data_urbs); 788 uas_zap_pending(devinfo, DID_RESET); 789 790 err = usb_reset_device(udev); 791 792 spin_lock_irqsave(&devinfo->lock, flags); 793 devinfo->resetting = 0; 794 spin_unlock_irqrestore(&devinfo->lock, flags); 795 796 usb_unlock_device(udev); 797 798 if (err) { 799 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n", 800 __func__, err); 801 return FAILED; 802 } 803 804 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__); 805 return SUCCESS; 806 } 807 808 static int uas_target_alloc(struct scsi_target *starget) 809 { 810 struct uas_dev_info *devinfo = (struct uas_dev_info *) 811 dev_to_shost(starget->dev.parent)->hostdata; 812 813 if (devinfo->flags & US_FL_NO_REPORT_LUNS) 814 starget->no_report_luns = 1; 815 816 return 0; 817 } 818 819 static int uas_slave_alloc(struct scsi_device *sdev) 820 { 821 struct uas_dev_info *devinfo = 822 (struct uas_dev_info *)sdev->host->hostdata; 823 824 sdev->hostdata = devinfo; 825 826 /* 827 * The protocol has no requirements on alignment in the strict sense. 828 * Controllers may or may not have alignment restrictions. 829 * As this is not exported, we use an extremely conservative guess. 830 */ 831 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); 832 833 if (devinfo->flags & US_FL_MAX_SECTORS_64) 834 blk_queue_max_hw_sectors(sdev->request_queue, 64); 835 else if (devinfo->flags & US_FL_MAX_SECTORS_240) 836 blk_queue_max_hw_sectors(sdev->request_queue, 240); 837 838 return 0; 839 } 840 841 static int uas_slave_configure(struct scsi_device *sdev) 842 { 843 struct uas_dev_info *devinfo = sdev->hostdata; 844 845 if (devinfo->flags & US_FL_NO_REPORT_OPCODES) 846 sdev->no_report_opcodes = 1; 847 848 /* A few buggy USB-ATA bridges don't understand FUA */ 849 if (devinfo->flags & US_FL_BROKEN_FUA) 850 sdev->broken_fua = 1; 851 852 /* UAS also needs to support FL_ALWAYS_SYNC */ 853 if (devinfo->flags & US_FL_ALWAYS_SYNC) { 854 sdev->skip_ms_page_3f = 1; 855 sdev->skip_ms_page_8 = 1; 856 sdev->wce_default_on = 1; 857 } 858 859 /* Some disks cannot handle READ_CAPACITY_16 */ 860 if (devinfo->flags & US_FL_NO_READ_CAPACITY_16) 861 sdev->no_read_capacity_16 = 1; 862 863 /* Some disks cannot handle WRITE_SAME */ 864 if (devinfo->flags & US_FL_NO_SAME) 865 sdev->no_write_same = 1; 866 /* 867 * Some disks return the total number of blocks in response 868 * to READ CAPACITY rather than the highest block number. 869 * If this device makes that mistake, tell the sd driver. 870 */ 871 if (devinfo->flags & US_FL_FIX_CAPACITY) 872 sdev->fix_capacity = 1; 873 874 /* 875 * in some cases we have to guess 876 */ 877 if (devinfo->flags & US_FL_CAPACITY_HEURISTICS) 878 sdev->guess_capacity = 1; 879 880 /* 881 * Some devices report generic values until the media has been 882 * accessed. Force a READ(10) prior to querying device 883 * characteristics. 884 */ 885 sdev->read_before_ms = 1; 886 887 /* 888 * Some devices don't like MODE SENSE with page=0x3f, 889 * which is the command used for checking if a device 890 * is write-protected. Now that we tell the sd driver 891 * to do a 192-byte transfer with this command the 892 * majority of devices work fine, but a few still can't 893 * handle it. The sd driver will simply assume those 894 * devices are write-enabled. 895 */ 896 if (devinfo->flags & US_FL_NO_WP_DETECT) 897 sdev->skip_ms_page_3f = 1; 898 899 scsi_change_queue_depth(sdev, devinfo->qdepth - 2); 900 return 0; 901 } 902 903 static const struct scsi_host_template uas_host_template = { 904 .module = THIS_MODULE, 905 .name = "uas", 906 .queuecommand = uas_queuecommand, 907 .target_alloc = uas_target_alloc, 908 .slave_alloc = uas_slave_alloc, 909 .slave_configure = uas_slave_configure, 910 .eh_abort_handler = uas_eh_abort_handler, 911 .eh_device_reset_handler = uas_eh_device_reset_handler, 912 .this_id = -1, 913 .skip_settle_delay = 1, 914 .dma_boundary = PAGE_SIZE - 1, 915 .cmd_size = sizeof(struct uas_cmd_info), 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