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 34struct 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 u64 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 51enum { 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 */ 67struct 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 */ 76static int uas_submit_urbs(struct scsi_cmnd *cmnd, 77 struct uas_dev_info *devinfo); 78static void uas_do_work(struct work_struct *work); 79static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller); 80static void uas_free_streams(struct uas_dev_info *devinfo); 81static 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 */ 95static struct workqueue_struct *workqueue; 96 97static 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 } 127out: 128 spin_unlock_irqrestore(&devinfo->lock, flags); 129} 130 131static 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 142static 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 152static 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 176static 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 199static 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 225static 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 244static 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 261static 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 274static 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 297static 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 } 377out: 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 392static 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__); 429out: 430 usb_free_urb(urb); 431 spin_unlock_irqrestore(&devinfo->lock, flags); 432} 433 434static 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 442static 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 465static 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 492static 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 536static int 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 -ENOMEM; 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 } 552 return err; 553} 554 555static int uas_submit_urbs(struct scsi_cmnd *cmnd, 556 struct uas_dev_info *devinfo) 557{ 558 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd); 559 int err; 560 561 lockdep_assert_held(&devinfo->lock); 562 if (cmdinfo->state & SUBMIT_STATUS_URB) { 563 err = uas_submit_sense_urb(cmnd, GFP_ATOMIC); 564 if (err) 565 return err; 566 cmdinfo->state &= ~SUBMIT_STATUS_URB; 567 } 568 569 if (cmdinfo->state & ALLOC_DATA_IN_URB) { 570 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC, 571 cmnd, DMA_FROM_DEVICE); 572 if (!cmdinfo->data_in_urb) 573 return -ENOMEM; 574 cmdinfo->state &= ~ALLOC_DATA_IN_URB; 575 } 576 577 if (cmdinfo->state & SUBMIT_DATA_IN_URB) { 578 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs); 579 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC); 580 if (err) { 581 usb_unanchor_urb(cmdinfo->data_in_urb); 582 uas_log_cmd_state(cmnd, "data in submit err", err); 583 return err; 584 } 585 cmdinfo->state &= ~SUBMIT_DATA_IN_URB; 586 cmdinfo->state |= DATA_IN_URB_INFLIGHT; 587 } 588 589 if (cmdinfo->state & ALLOC_DATA_OUT_URB) { 590 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC, 591 cmnd, DMA_TO_DEVICE); 592 if (!cmdinfo->data_out_urb) 593 return -ENOMEM; 594 cmdinfo->state &= ~ALLOC_DATA_OUT_URB; 595 } 596 597 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) { 598 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs); 599 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC); 600 if (err) { 601 usb_unanchor_urb(cmdinfo->data_out_urb); 602 uas_log_cmd_state(cmnd, "data out submit err", err); 603 return err; 604 } 605 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB; 606 cmdinfo->state |= DATA_OUT_URB_INFLIGHT; 607 } 608 609 if (cmdinfo->state & ALLOC_CMD_URB) { 610 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd); 611 if (!cmdinfo->cmd_urb) 612 return -ENOMEM; 613 cmdinfo->state &= ~ALLOC_CMD_URB; 614 } 615 616 if (cmdinfo->state & SUBMIT_CMD_URB) { 617 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs); 618 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC); 619 if (err) { 620 usb_unanchor_urb(cmdinfo->cmd_urb); 621 uas_log_cmd_state(cmnd, "cmd submit err", err); 622 return err; 623 } 624 cmdinfo->cmd_urb = NULL; 625 cmdinfo->state &= ~SUBMIT_CMD_URB; 626 cmdinfo->state |= COMMAND_INFLIGHT; 627 } 628 629 return 0; 630} 631 632static int uas_queuecommand_lck(struct scsi_cmnd *cmnd) 633{ 634 struct scsi_device *sdev = cmnd->device; 635 struct uas_dev_info *devinfo = sdev->hostdata; 636 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd); 637 unsigned long flags; 638 int idx, err; 639 640 /* Re-check scsi_block_requests now that we've the host-lock */ 641 if (cmnd->device->host->host_self_blocked) 642 return SCSI_MLQUEUE_DEVICE_BUSY; 643 644 if ((devinfo->flags & US_FL_NO_ATA_1X) && 645 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) { 646 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB, 647 sizeof(usb_stor_sense_invalidCDB)); 648 cmnd->result = SAM_STAT_CHECK_CONDITION; 649 scsi_done(cmnd); 650 return 0; 651 } 652 653 spin_lock_irqsave(&devinfo->lock, flags); 654 655 if (devinfo->resetting) { 656 set_host_byte(cmnd, DID_ERROR); 657 scsi_done(cmnd); 658 goto zombie; 659 } 660 661 /* Find a free uas-tag */ 662 for (idx = 0; idx < devinfo->qdepth; idx++) { 663 if (!devinfo->cmnd[idx]) 664 break; 665 } 666 if (idx == devinfo->qdepth) { 667 spin_unlock_irqrestore(&devinfo->lock, flags); 668 return SCSI_MLQUEUE_DEVICE_BUSY; 669 } 670 671 memset(cmdinfo, 0, sizeof(*cmdinfo)); 672 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */ 673 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB; 674 675 switch (cmnd->sc_data_direction) { 676 case DMA_FROM_DEVICE: 677 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; 678 break; 679 case DMA_BIDIRECTIONAL: 680 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; 681 fallthrough; 682 case DMA_TO_DEVICE: 683 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB; 684 break; 685 case DMA_NONE: 686 break; 687 } 688 689 if (!devinfo->use_streams) 690 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB); 691 692 err = uas_submit_urbs(cmnd, devinfo); 693 /* 694 * in case of fatal errors the SCSI layer is peculiar 695 * a command that has finished is a success for the purpose 696 * of queueing, no matter how fatal the error 697 */ 698 if (err == -ENODEV) { 699 set_host_byte(cmnd, DID_NO_CONNECT); 700 scsi_done(cmnd); 701 goto zombie; 702 } 703 if (err) { 704 /* If we did nothing, give up now */ 705 if (cmdinfo->state & SUBMIT_STATUS_URB) { 706 spin_unlock_irqrestore(&devinfo->lock, flags); 707 return SCSI_MLQUEUE_DEVICE_BUSY; 708 } 709 uas_add_work(cmnd); 710 } 711 712 devinfo->cmnd[idx] = cmnd; 713zombie: 714 spin_unlock_irqrestore(&devinfo->lock, flags); 715 return 0; 716} 717 718static DEF_SCSI_QCMD(uas_queuecommand) 719 720/* 721 * For now we do not support actually sending an abort to the device, so 722 * this eh always fails. Still we must define it to make sure that we've 723 * dropped all references to the cmnd in question once this function exits. 724 */ 725static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) 726{ 727 struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd); 728 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; 729 struct urb *data_in_urb = NULL; 730 struct urb *data_out_urb = NULL; 731 unsigned long flags; 732 733 spin_lock_irqsave(&devinfo->lock, flags); 734 735 uas_log_cmd_state(cmnd, __func__, 0); 736 737 /* Ensure that try_complete does not call scsi_done */ 738 cmdinfo->state |= COMMAND_ABORTED; 739 740 /* Drop all refs to this cmnd, kill data urbs to break their ref */ 741 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL; 742 if (cmdinfo->state & DATA_IN_URB_INFLIGHT) 743 data_in_urb = usb_get_urb(cmdinfo->data_in_urb); 744 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT) 745 data_out_urb = usb_get_urb(cmdinfo->data_out_urb); 746 747 uas_free_unsubmitted_urbs(cmnd); 748 749 spin_unlock_irqrestore(&devinfo->lock, flags); 750 751 if (data_in_urb) { 752 usb_kill_urb(data_in_urb); 753 usb_put_urb(data_in_urb); 754 } 755 if (data_out_urb) { 756 usb_kill_urb(data_out_urb); 757 usb_put_urb(data_out_urb); 758 } 759 760 return FAILED; 761} 762 763static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd) 764{ 765 struct scsi_device *sdev = cmnd->device; 766 struct uas_dev_info *devinfo = sdev->hostdata; 767 struct usb_device *udev = devinfo->udev; 768 unsigned long flags; 769 int err; 770 771 err = usb_lock_device_for_reset(udev, devinfo->intf); 772 if (err) { 773 shost_printk(KERN_ERR, sdev->host, 774 "%s FAILED to get lock err %d\n", __func__, err); 775 return FAILED; 776 } 777 778 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__); 779 780 spin_lock_irqsave(&devinfo->lock, flags); 781 devinfo->resetting = 1; 782 spin_unlock_irqrestore(&devinfo->lock, flags); 783 784 usb_kill_anchored_urbs(&devinfo->cmd_urbs); 785 usb_kill_anchored_urbs(&devinfo->sense_urbs); 786 usb_kill_anchored_urbs(&devinfo->data_urbs); 787 uas_zap_pending(devinfo, DID_RESET); 788 789 err = usb_reset_device(udev); 790 791 spin_lock_irqsave(&devinfo->lock, flags); 792 devinfo->resetting = 0; 793 spin_unlock_irqrestore(&devinfo->lock, flags); 794 795 usb_unlock_device(udev); 796 797 if (err) { 798 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n", 799 __func__, err); 800 return FAILED; 801 } 802 803 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__); 804 return SUCCESS; 805} 806 807static int uas_target_alloc(struct scsi_target *starget) 808{ 809 struct uas_dev_info *devinfo = (struct uas_dev_info *) 810 dev_to_shost(starget->dev.parent)->hostdata; 811 812 if (devinfo->flags & US_FL_NO_REPORT_LUNS) 813 starget->no_report_luns = 1; 814 815 return 0; 816} 817 818static int uas_slave_alloc(struct scsi_device *sdev) 819{ 820 struct uas_dev_info *devinfo = 821 (struct uas_dev_info *)sdev->host->hostdata; 822 823 sdev->hostdata = devinfo; 824 825 /* 826 * The protocol has no requirements on alignment in the strict sense. 827 * Controllers may or may not have alignment restrictions. 828 * As this is not exported, we use an extremely conservative guess. 829 */ 830 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); 831 832 if (devinfo->flags & US_FL_MAX_SECTORS_64) 833 blk_queue_max_hw_sectors(sdev->request_queue, 64); 834 else if (devinfo->flags & US_FL_MAX_SECTORS_240) 835 blk_queue_max_hw_sectors(sdev->request_queue, 240); 836 837 return 0; 838} 839 840static int uas_slave_configure(struct scsi_device *sdev) 841{ 842 struct uas_dev_info *devinfo = sdev->hostdata; 843 844 if (devinfo->flags & US_FL_NO_REPORT_OPCODES) 845 sdev->no_report_opcodes = 1; 846 847 /* A few buggy USB-ATA bridges don't understand FUA */ 848 if (devinfo->flags & US_FL_BROKEN_FUA) 849 sdev->broken_fua = 1; 850 851 /* UAS also needs to support FL_ALWAYS_SYNC */ 852 if (devinfo->flags & US_FL_ALWAYS_SYNC) { 853 sdev->skip_ms_page_3f = 1; 854 sdev->skip_ms_page_8 = 1; 855 sdev->wce_default_on = 1; 856 } 857 858 /* Some disks cannot handle READ_CAPACITY_16 */ 859 if (devinfo->flags & US_FL_NO_READ_CAPACITY_16) 860 sdev->no_read_capacity_16 = 1; 861 862 /* Some disks cannot handle WRITE_SAME */ 863 if (devinfo->flags & US_FL_NO_SAME) 864 sdev->no_write_same = 1; 865 /* 866 * Some disks return the total number of blocks in response 867 * to READ CAPACITY rather than the highest block number. 868 * If this device makes that mistake, tell the sd driver. 869 */ 870 if (devinfo->flags & US_FL_FIX_CAPACITY) 871 sdev->fix_capacity = 1; 872 873 /* 874 * in some cases we have to guess 875 */ 876 if (devinfo->flags & US_FL_CAPACITY_HEURISTICS) 877 sdev->guess_capacity = 1; 878 879 /* 880 * Some devices report generic values until the media has been 881 * accessed. Force a READ(10) prior to querying device 882 * characteristics. 883 */ 884 sdev->read_before_ms = 1; 885 886 /* 887 * Some devices don't like MODE SENSE with page=0x3f, 888 * which is the command used for checking if a device 889 * is write-protected. Now that we tell the sd driver 890 * to do a 192-byte transfer with this command the 891 * majority of devices work fine, but a few still can't 892 * handle it. The sd driver will simply assume those 893 * devices are write-enabled. 894 */ 895 if (devinfo->flags & US_FL_NO_WP_DETECT) 896 sdev->skip_ms_page_3f = 1; 897 898 scsi_change_queue_depth(sdev, devinfo->qdepth - 2); 899 return 0; 900} 901 902static const struct scsi_host_template uas_host_template = { 903 .module = THIS_MODULE, 904 .name = "uas", 905 .queuecommand = uas_queuecommand, 906 .target_alloc = uas_target_alloc, 907 .slave_alloc = uas_slave_alloc, 908 .slave_configure = uas_slave_configure, 909 .eh_abort_handler = uas_eh_abort_handler, 910 .eh_device_reset_handler = uas_eh_device_reset_handler, 911 .this_id = -1, 912 .skip_settle_delay = 1, 913 .dma_boundary = PAGE_SIZE - 1, 914 .cmd_size = sizeof(struct uas_cmd_info), 915}; 916 917#define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ 918 vendorName, productName, useProtocol, useTransport, \ 919 initFunction, flags) \ 920{ USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \ 921 .driver_info = (flags) } 922 923static struct usb_device_id uas_usb_ids[] = { 924# include "unusual_uas.h" 925 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) }, 926 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) }, 927 { } 928}; 929MODULE_DEVICE_TABLE(usb, uas_usb_ids); 930 931#undef UNUSUAL_DEV 932 933static int uas_switch_interface(struct usb_device *udev, 934 struct usb_interface *intf) 935{ 936 struct usb_host_interface *alt; 937 938 alt = uas_find_uas_alt_setting(intf); 939 if (!alt) 940 return -ENODEV; 941 942 return usb_set_interface(udev, alt->desc.bInterfaceNumber, 943 alt->desc.bAlternateSetting); 944} 945 946static int uas_configure_endpoints(struct uas_dev_info *devinfo) 947{ 948 struct usb_host_endpoint *eps[4] = { }; 949 struct usb_device *udev = devinfo->udev; 950 int r; 951 952 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps); 953 if (r) 954 return r; 955 956 devinfo->cmd_pipe = usb_sndbulkpipe(udev, 957 usb_endpoint_num(&eps[0]->desc)); 958 devinfo->status_pipe = usb_rcvbulkpipe(udev, 959 usb_endpoint_num(&eps[1]->desc)); 960 devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 961 usb_endpoint_num(&eps[2]->desc)); 962 devinfo->data_out_pipe = usb_sndbulkpipe(udev, 963 usb_endpoint_num(&eps[3]->desc)); 964 965 if (udev->speed < USB_SPEED_SUPER) { 966 devinfo->qdepth = 32; 967 devinfo->use_streams = 0; 968 } else { 969 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 970 3, MAX_CMNDS, GFP_NOIO); 971 if (devinfo->qdepth < 0) 972 return devinfo->qdepth; 973 devinfo->use_streams = 1; 974 } 975 976 return 0; 977} 978 979static void uas_free_streams(struct uas_dev_info *devinfo) 980{ 981 struct usb_device *udev = devinfo->udev; 982 struct usb_host_endpoint *eps[3]; 983 984 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe); 985 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); 986 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); 987 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO); 988} 989 990static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id) 991{ 992 int result = -ENOMEM; 993 struct Scsi_Host *shost = NULL; 994 struct uas_dev_info *devinfo; 995 struct usb_device *udev = interface_to_usbdev(intf); 996 u64 dev_flags; 997 998 if (!uas_use_uas_driver(intf, id, &dev_flags)) 999 return -ENODEV; 1000 1001 if (uas_switch_interface(udev, intf)) 1002 return -ENODEV; 1003 1004 shost = scsi_host_alloc(&uas_host_template, 1005 sizeof(struct uas_dev_info)); 1006 if (!shost) 1007 goto set_alt0; 1008 1009 shost->max_cmd_len = 16 + 252; 1010 shost->max_id = 1; 1011 shost->max_lun = 256; 1012 shost->max_channel = 0; 1013 shost->sg_tablesize = udev->bus->sg_tablesize; 1014 1015 devinfo = (struct uas_dev_info *)shost->hostdata; 1016 devinfo->intf = intf; 1017 devinfo->udev = udev; 1018 devinfo->resetting = 0; 1019 devinfo->shutdown = 0; 1020 devinfo->flags = dev_flags; 1021 init_usb_anchor(&devinfo->cmd_urbs); 1022 init_usb_anchor(&devinfo->sense_urbs); 1023 init_usb_anchor(&devinfo->data_urbs); 1024 spin_lock_init(&devinfo->lock); 1025 INIT_WORK(&devinfo->work, uas_do_work); 1026 INIT_WORK(&devinfo->scan_work, uas_scan_work); 1027 1028 result = uas_configure_endpoints(devinfo); 1029 if (result) 1030 goto set_alt0; 1031 1032 /* 1033 * 1 tag is reserved for untagged commands + 1034 * 1 tag to avoid off by one errors in some bridge firmwares 1035 */ 1036 shost->can_queue = devinfo->qdepth - 2; 1037 1038 usb_set_intfdata(intf, shost); 1039 result = scsi_add_host(shost, &intf->dev); 1040 if (result) 1041 goto free_streams; 1042 1043 /* Submit the delayed_work for SCSI-device scanning */ 1044 schedule_work(&devinfo->scan_work); 1045 1046 return result; 1047 1048free_streams: 1049 uas_free_streams(devinfo); 1050 usb_set_intfdata(intf, NULL); 1051set_alt0: 1052 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0); 1053 if (shost) 1054 scsi_host_put(shost); 1055 return result; 1056} 1057 1058static int uas_cmnd_list_empty(struct uas_dev_info *devinfo) 1059{ 1060 unsigned long flags; 1061 int i, r = 1; 1062 1063 spin_lock_irqsave(&devinfo->lock, flags); 1064 1065 for (i = 0; i < devinfo->qdepth; i++) { 1066 if (devinfo->cmnd[i]) { 1067 r = 0; /* Not empty */ 1068 break; 1069 } 1070 } 1071 1072 spin_unlock_irqrestore(&devinfo->lock, flags); 1073 1074 return r; 1075} 1076 1077/* 1078 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily 1079 * get empty while there still is more work to do due to sense-urbs completing 1080 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty. 1081 */ 1082static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo) 1083{ 1084 unsigned long start_time; 1085 int r; 1086 1087 start_time = jiffies; 1088 do { 1089 flush_work(&devinfo->work); 1090 1091 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000); 1092 if (r == 0) 1093 return -ETIME; 1094 1095 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500); 1096 if (r == 0) 1097 return -ETIME; 1098 1099 if (time_after(jiffies, start_time + 5 * HZ)) 1100 return -ETIME; 1101 } while (!uas_cmnd_list_empty(devinfo)); 1102 1103 return 0; 1104} 1105 1106static int uas_pre_reset(struct usb_interface *intf) 1107{ 1108 struct Scsi_Host *shost = usb_get_intfdata(intf); 1109 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1110 unsigned long flags; 1111 1112 if (devinfo->shutdown) 1113 return 0; 1114 1115 /* Block new requests */ 1116 spin_lock_irqsave(shost->host_lock, flags); 1117 scsi_block_requests(shost); 1118 spin_unlock_irqrestore(shost->host_lock, flags); 1119 1120 if (uas_wait_for_pending_cmnds(devinfo) != 0) { 1121 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__); 1122 scsi_unblock_requests(shost); 1123 return 1; 1124 } 1125 1126 uas_free_streams(devinfo); 1127 1128 return 0; 1129} 1130 1131static int uas_post_reset(struct usb_interface *intf) 1132{ 1133 struct Scsi_Host *shost = usb_get_intfdata(intf); 1134 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1135 unsigned long flags; 1136 int err; 1137 1138 if (devinfo->shutdown) 1139 return 0; 1140 1141 err = uas_configure_endpoints(devinfo); 1142 if (err && err != -ENODEV) 1143 shost_printk(KERN_ERR, shost, 1144 "%s: alloc streams error %d after reset", 1145 __func__, err); 1146 1147 /* we must unblock the host in every case lest we deadlock */ 1148 spin_lock_irqsave(shost->host_lock, flags); 1149 scsi_report_bus_reset(shost, 0); 1150 spin_unlock_irqrestore(shost->host_lock, flags); 1151 1152 scsi_unblock_requests(shost); 1153 1154 return err ? 1 : 0; 1155} 1156 1157static int uas_suspend(struct usb_interface *intf, pm_message_t message) 1158{ 1159 struct Scsi_Host *shost = usb_get_intfdata(intf); 1160 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1161 1162 if (uas_wait_for_pending_cmnds(devinfo) != 0) { 1163 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__); 1164 return -ETIME; 1165 } 1166 1167 return 0; 1168} 1169 1170static int uas_resume(struct usb_interface *intf) 1171{ 1172 return 0; 1173} 1174 1175static int uas_reset_resume(struct usb_interface *intf) 1176{ 1177 struct Scsi_Host *shost = usb_get_intfdata(intf); 1178 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1179 unsigned long flags; 1180 int err; 1181 1182 err = uas_configure_endpoints(devinfo); 1183 if (err) { 1184 shost_printk(KERN_ERR, shost, 1185 "%s: alloc streams error %d after reset", 1186 __func__, err); 1187 return -EIO; 1188 } 1189 1190 spin_lock_irqsave(shost->host_lock, flags); 1191 scsi_report_bus_reset(shost, 0); 1192 spin_unlock_irqrestore(shost->host_lock, flags); 1193 1194 return 0; 1195} 1196 1197static void uas_disconnect(struct usb_interface *intf) 1198{ 1199 struct Scsi_Host *shost = usb_get_intfdata(intf); 1200 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1201 unsigned long flags; 1202 1203 spin_lock_irqsave(&devinfo->lock, flags); 1204 devinfo->resetting = 1; 1205 spin_unlock_irqrestore(&devinfo->lock, flags); 1206 1207 cancel_work_sync(&devinfo->work); 1208 usb_kill_anchored_urbs(&devinfo->cmd_urbs); 1209 usb_kill_anchored_urbs(&devinfo->sense_urbs); 1210 usb_kill_anchored_urbs(&devinfo->data_urbs); 1211 uas_zap_pending(devinfo, DID_NO_CONNECT); 1212 1213 /* 1214 * Prevent SCSI scanning (if it hasn't started yet) 1215 * or wait for the SCSI-scanning routine to stop. 1216 */ 1217 cancel_work_sync(&devinfo->scan_work); 1218 1219 scsi_remove_host(shost); 1220 uas_free_streams(devinfo); 1221 scsi_host_put(shost); 1222} 1223 1224/* 1225 * Put the device back in usb-storage mode on shutdown, as some BIOS-es 1226 * hang on reboot when the device is still in uas mode. Note the reset is 1227 * necessary as some devices won't revert to usb-storage mode without it. 1228 */ 1229static void uas_shutdown(struct device *dev) 1230{ 1231 struct usb_interface *intf = to_usb_interface(dev); 1232 struct usb_device *udev = interface_to_usbdev(intf); 1233 struct Scsi_Host *shost = usb_get_intfdata(intf); 1234 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1235 1236 if (system_state != SYSTEM_RESTART) 1237 return; 1238 1239 devinfo->shutdown = 1; 1240 uas_free_streams(devinfo); 1241 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0); 1242 usb_reset_device(udev); 1243} 1244 1245static struct usb_driver uas_driver = { 1246 .name = "uas", 1247 .probe = uas_probe, 1248 .disconnect = uas_disconnect, 1249 .pre_reset = uas_pre_reset, 1250 .post_reset = uas_post_reset, 1251 .suspend = uas_suspend, 1252 .resume = uas_resume, 1253 .reset_resume = uas_reset_resume, 1254 .driver.shutdown = uas_shutdown, 1255 .id_table = uas_usb_ids, 1256}; 1257 1258static int __init uas_init(void) 1259{ 1260 int rv; 1261 1262 workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0); 1263 if (!workqueue) 1264 return -ENOMEM; 1265 1266 rv = usb_register(&uas_driver); 1267 if (rv) { 1268 destroy_workqueue(workqueue); 1269 return -ENOMEM; 1270 } 1271 1272 return 0; 1273} 1274 1275static void __exit uas_exit(void) 1276{ 1277 usb_deregister(&uas_driver); 1278 destroy_workqueue(workqueue); 1279} 1280 1281module_init(uas_init); 1282module_exit(uas_exit); 1283 1284MODULE_LICENSE("GPL"); 1285MODULE_IMPORT_NS(USB_STORAGE); 1286MODULE_AUTHOR( 1287 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp"); 1288