1 /* Driver for USB Mass Storage compliant devices 2 * 3 * Current development and maintenance by: 4 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) 5 * 6 * Developed with the assistance of: 7 * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) 8 * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov) 9 * (c) 2002 Alan Stern <stern@rowland.org> 10 * 11 * Initial work by: 12 * (c) 1999 Michael Gee (michael@linuxspecific.com) 13 * 14 * This driver is based on the 'USB Mass Storage Class' document. This 15 * describes in detail the protocol used to communicate with such 16 * devices. Clearly, the designers had SCSI and ATAPI commands in 17 * mind when they created this document. The commands are all very 18 * similar to commands in the SCSI-II and ATAPI specifications. 19 * 20 * It is important to note that in a number of cases this class 21 * exhibits class-specific exemptions from the USB specification. 22 * Notably the usage of NAK, STALL and ACK differs from the norm, in 23 * that they are used to communicate wait, failed and OK on commands. 24 * 25 * Also, for certain devices, the interrupt endpoint is used to convey 26 * status of a command. 27 * 28 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more 29 * information about this driver. 30 * 31 * This program is free software; you can redistribute it and/or modify it 32 * under the terms of the GNU General Public License as published by the 33 * Free Software Foundation; either version 2, or (at your option) any 34 * later version. 35 * 36 * This program is distributed in the hope that it will be useful, but 37 * WITHOUT ANY WARRANTY; without even the implied warranty of 38 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 39 * General Public License for more details. 40 * 41 * You should have received a copy of the GNU General Public License along 42 * with this program; if not, write to the Free Software Foundation, Inc., 43 * 675 Mass Ave, Cambridge, MA 02139, USA. 44 */ 45 46 #include <linux/sched.h> 47 #include <linux/errno.h> 48 #include <linux/slab.h> 49 50 #include <scsi/scsi.h> 51 #include <scsi/scsi_eh.h> 52 #include <scsi/scsi_device.h> 53 54 #include "usb.h" 55 #include "transport.h" 56 #include "protocol.h" 57 #include "scsiglue.h" 58 #include "debug.h" 59 60 #include <linux/blkdev.h> 61 #include "../../scsi/sd.h" 62 63 64 /*********************************************************************** 65 * Data transfer routines 66 ***********************************************************************/ 67 68 /* 69 * This is subtle, so pay attention: 70 * --------------------------------- 71 * We're very concerned about races with a command abort. Hanging this code 72 * is a sure fire way to hang the kernel. (Note that this discussion applies 73 * only to transactions resulting from a scsi queued-command, since only 74 * these transactions are subject to a scsi abort. Other transactions, such 75 * as those occurring during device-specific initialization, must be handled 76 * by a separate code path.) 77 * 78 * The abort function (usb_storage_command_abort() in scsiglue.c) first 79 * sets the machine state and the ABORTING bit in us->dflags to prevent 80 * new URBs from being submitted. It then calls usb_stor_stop_transport() 81 * below, which atomically tests-and-clears the URB_ACTIVE bit in us->dflags 82 * to see if the current_urb needs to be stopped. Likewise, the SG_ACTIVE 83 * bit is tested to see if the current_sg scatter-gather request needs to be 84 * stopped. The timeout callback routine does much the same thing. 85 * 86 * When a disconnect occurs, the DISCONNECTING bit in us->dflags is set to 87 * prevent new URBs from being submitted, and usb_stor_stop_transport() is 88 * called to stop any ongoing requests. 89 * 90 * The submit function first verifies that the submitting is allowed 91 * (neither ABORTING nor DISCONNECTING bits are set) and that the submit 92 * completes without errors, and only then sets the URB_ACTIVE bit. This 93 * prevents the stop_transport() function from trying to cancel the URB 94 * while the submit call is underway. Next, the submit function must test 95 * the flags to see if an abort or disconnect occurred during the submission 96 * or before the URB_ACTIVE bit was set. If so, it's essential to cancel 97 * the URB if it hasn't been cancelled already (i.e., if the URB_ACTIVE bit 98 * is still set). Either way, the function must then wait for the URB to 99 * finish. Note that the URB can still be in progress even after a call to 100 * usb_unlink_urb() returns. 101 * 102 * The idea is that (1) once the ABORTING or DISCONNECTING bit is set, 103 * either the stop_transport() function or the submitting function 104 * is guaranteed to call usb_unlink_urb() for an active URB, 105 * and (2) test_and_clear_bit() prevents usb_unlink_urb() from being 106 * called more than once or from being called during usb_submit_urb(). 107 */ 108 109 /* This is the completion handler which will wake us up when an URB 110 * completes. 111 */ 112 static void usb_stor_blocking_completion(struct urb *urb) 113 { 114 struct completion *urb_done_ptr = urb->context; 115 116 complete(urb_done_ptr); 117 } 118 119 /* This is the common part of the URB message submission code 120 * 121 * All URBs from the usb-storage driver involved in handling a queued scsi 122 * command _must_ pass through this function (or something like it) for the 123 * abort mechanisms to work properly. 124 */ 125 static int usb_stor_msg_common(struct us_data *us, int timeout) 126 { 127 struct completion urb_done; 128 long timeleft; 129 int status; 130 131 /* don't submit URBs during abort processing */ 132 if (test_bit(US_FLIDX_ABORTING, &us->dflags)) 133 return -EIO; 134 135 /* set up data structures for the wakeup system */ 136 init_completion(&urb_done); 137 138 /* fill the common fields in the URB */ 139 us->current_urb->context = &urb_done; 140 us->current_urb->actual_length = 0; 141 us->current_urb->error_count = 0; 142 us->current_urb->status = 0; 143 144 /* we assume that if transfer_buffer isn't us->iobuf then it 145 * hasn't been mapped for DMA. Yes, this is clunky, but it's 146 * easier than always having the caller tell us whether the 147 * transfer buffer has already been mapped. */ 148 us->current_urb->transfer_flags = URB_NO_SETUP_DMA_MAP; 149 if (us->current_urb->transfer_buffer == us->iobuf) 150 us->current_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 151 us->current_urb->transfer_dma = us->iobuf_dma; 152 us->current_urb->setup_dma = us->cr_dma; 153 154 /* submit the URB */ 155 status = usb_submit_urb(us->current_urb, GFP_NOIO); 156 if (status) { 157 /* something went wrong */ 158 return status; 159 } 160 161 /* since the URB has been submitted successfully, it's now okay 162 * to cancel it */ 163 set_bit(US_FLIDX_URB_ACTIVE, &us->dflags); 164 165 /* did an abort occur during the submission? */ 166 if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { 167 168 /* cancel the URB, if it hasn't been cancelled already */ 169 if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { 170 US_DEBUGP("-- cancelling URB\n"); 171 usb_unlink_urb(us->current_urb); 172 } 173 } 174 175 /* wait for the completion of the URB */ 176 timeleft = wait_for_completion_interruptible_timeout( 177 &urb_done, timeout ? : MAX_SCHEDULE_TIMEOUT); 178 179 clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags); 180 181 if (timeleft <= 0) { 182 US_DEBUGP("%s -- cancelling URB\n", 183 timeleft == 0 ? "Timeout" : "Signal"); 184 usb_kill_urb(us->current_urb); 185 } 186 187 /* return the URB status */ 188 return us->current_urb->status; 189 } 190 191 /* 192 * Transfer one control message, with timeouts, and allowing early 193 * termination. Return codes are usual -Exxx, *not* USB_STOR_XFER_xxx. 194 */ 195 int usb_stor_control_msg(struct us_data *us, unsigned int pipe, 196 u8 request, u8 requesttype, u16 value, u16 index, 197 void *data, u16 size, int timeout) 198 { 199 int status; 200 201 US_DEBUGP("%s: rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", 202 __func__, request, requesttype, 203 value, index, size); 204 205 /* fill in the devrequest structure */ 206 us->cr->bRequestType = requesttype; 207 us->cr->bRequest = request; 208 us->cr->wValue = cpu_to_le16(value); 209 us->cr->wIndex = cpu_to_le16(index); 210 us->cr->wLength = cpu_to_le16(size); 211 212 /* fill and submit the URB */ 213 usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, 214 (unsigned char*) us->cr, data, size, 215 usb_stor_blocking_completion, NULL); 216 status = usb_stor_msg_common(us, timeout); 217 218 /* return the actual length of the data transferred if no error */ 219 if (status == 0) 220 status = us->current_urb->actual_length; 221 return status; 222 } 223 EXPORT_SYMBOL_GPL(usb_stor_control_msg); 224 225 /* This is a version of usb_clear_halt() that allows early termination and 226 * doesn't read the status from the device -- this is because some devices 227 * crash their internal firmware when the status is requested after a halt. 228 * 229 * A definitive list of these 'bad' devices is too difficult to maintain or 230 * make complete enough to be useful. This problem was first observed on the 231 * Hagiwara FlashGate DUAL unit. However, bus traces reveal that neither 232 * MacOS nor Windows checks the status after clearing a halt. 233 * 234 * Since many vendors in this space limit their testing to interoperability 235 * with these two OSes, specification violations like this one are common. 236 */ 237 int usb_stor_clear_halt(struct us_data *us, unsigned int pipe) 238 { 239 int result; 240 int endp = usb_pipeendpoint(pipe); 241 242 if (usb_pipein (pipe)) 243 endp |= USB_DIR_IN; 244 245 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 246 USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 247 USB_ENDPOINT_HALT, endp, 248 NULL, 0, 3*HZ); 249 250 /* reset the endpoint toggle */ 251 if (result >= 0) 252 usb_settoggle(us->pusb_dev, usb_pipeendpoint(pipe), 253 usb_pipeout(pipe), 0); 254 255 US_DEBUGP("%s: result = %d\n", __func__, result); 256 return result; 257 } 258 EXPORT_SYMBOL_GPL(usb_stor_clear_halt); 259 260 261 /* 262 * Interpret the results of a URB transfer 263 * 264 * This function prints appropriate debugging messages, clears halts on 265 * non-control endpoints, and translates the status to the corresponding 266 * USB_STOR_XFER_xxx return code. 267 */ 268 static int interpret_urb_result(struct us_data *us, unsigned int pipe, 269 unsigned int length, int result, unsigned int partial) 270 { 271 US_DEBUGP("Status code %d; transferred %u/%u\n", 272 result, partial, length); 273 switch (result) { 274 275 /* no error code; did we send all the data? */ 276 case 0: 277 if (partial != length) { 278 US_DEBUGP("-- short transfer\n"); 279 return USB_STOR_XFER_SHORT; 280 } 281 282 US_DEBUGP("-- transfer complete\n"); 283 return USB_STOR_XFER_GOOD; 284 285 /* stalled */ 286 case -EPIPE: 287 /* for control endpoints, (used by CB[I]) a stall indicates 288 * a failed command */ 289 if (usb_pipecontrol(pipe)) { 290 US_DEBUGP("-- stall on control pipe\n"); 291 return USB_STOR_XFER_STALLED; 292 } 293 294 /* for other sorts of endpoint, clear the stall */ 295 US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe); 296 if (usb_stor_clear_halt(us, pipe) < 0) 297 return USB_STOR_XFER_ERROR; 298 return USB_STOR_XFER_STALLED; 299 300 /* babble - the device tried to send more than we wanted to read */ 301 case -EOVERFLOW: 302 US_DEBUGP("-- babble\n"); 303 return USB_STOR_XFER_LONG; 304 305 /* the transfer was cancelled by abort, disconnect, or timeout */ 306 case -ECONNRESET: 307 US_DEBUGP("-- transfer cancelled\n"); 308 return USB_STOR_XFER_ERROR; 309 310 /* short scatter-gather read transfer */ 311 case -EREMOTEIO: 312 US_DEBUGP("-- short read transfer\n"); 313 return USB_STOR_XFER_SHORT; 314 315 /* abort or disconnect in progress */ 316 case -EIO: 317 US_DEBUGP("-- abort or disconnect in progress\n"); 318 return USB_STOR_XFER_ERROR; 319 320 /* the catch-all error case */ 321 default: 322 US_DEBUGP("-- unknown error\n"); 323 return USB_STOR_XFER_ERROR; 324 } 325 } 326 327 /* 328 * Transfer one control message, without timeouts, but allowing early 329 * termination. Return codes are USB_STOR_XFER_xxx. 330 */ 331 int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe, 332 u8 request, u8 requesttype, u16 value, u16 index, 333 void *data, u16 size) 334 { 335 int result; 336 337 US_DEBUGP("%s: rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", 338 __func__, request, requesttype, 339 value, index, size); 340 341 /* fill in the devrequest structure */ 342 us->cr->bRequestType = requesttype; 343 us->cr->bRequest = request; 344 us->cr->wValue = cpu_to_le16(value); 345 us->cr->wIndex = cpu_to_le16(index); 346 us->cr->wLength = cpu_to_le16(size); 347 348 /* fill and submit the URB */ 349 usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, 350 (unsigned char*) us->cr, data, size, 351 usb_stor_blocking_completion, NULL); 352 result = usb_stor_msg_common(us, 0); 353 354 return interpret_urb_result(us, pipe, size, result, 355 us->current_urb->actual_length); 356 } 357 EXPORT_SYMBOL_GPL(usb_stor_ctrl_transfer); 358 359 /* 360 * Receive one interrupt buffer, without timeouts, but allowing early 361 * termination. Return codes are USB_STOR_XFER_xxx. 362 * 363 * This routine always uses us->recv_intr_pipe as the pipe and 364 * us->ep_bInterval as the interrupt interval. 365 */ 366 static int usb_stor_intr_transfer(struct us_data *us, void *buf, 367 unsigned int length) 368 { 369 int result; 370 unsigned int pipe = us->recv_intr_pipe; 371 unsigned int maxp; 372 373 US_DEBUGP("%s: xfer %u bytes\n", __func__, length); 374 375 /* calculate the max packet size */ 376 maxp = usb_maxpacket(us->pusb_dev, pipe, usb_pipeout(pipe)); 377 if (maxp > length) 378 maxp = length; 379 380 /* fill and submit the URB */ 381 usb_fill_int_urb(us->current_urb, us->pusb_dev, pipe, buf, 382 maxp, usb_stor_blocking_completion, NULL, 383 us->ep_bInterval); 384 result = usb_stor_msg_common(us, 0); 385 386 return interpret_urb_result(us, pipe, length, result, 387 us->current_urb->actual_length); 388 } 389 390 /* 391 * Transfer one buffer via bulk pipe, without timeouts, but allowing early 392 * termination. Return codes are USB_STOR_XFER_xxx. If the bulk pipe 393 * stalls during the transfer, the halt is automatically cleared. 394 */ 395 int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe, 396 void *buf, unsigned int length, unsigned int *act_len) 397 { 398 int result; 399 400 US_DEBUGP("%s: xfer %u bytes\n", __func__, length); 401 402 /* fill and submit the URB */ 403 usb_fill_bulk_urb(us->current_urb, us->pusb_dev, pipe, buf, length, 404 usb_stor_blocking_completion, NULL); 405 result = usb_stor_msg_common(us, 0); 406 407 /* store the actual length of the data transferred */ 408 if (act_len) 409 *act_len = us->current_urb->actual_length; 410 return interpret_urb_result(us, pipe, length, result, 411 us->current_urb->actual_length); 412 } 413 EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_buf); 414 415 /* 416 * Transfer a scatter-gather list via bulk transfer 417 * 418 * This function does basically the same thing as usb_stor_bulk_transfer_buf() 419 * above, but it uses the usbcore scatter-gather library. 420 */ 421 static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe, 422 struct scatterlist *sg, int num_sg, unsigned int length, 423 unsigned int *act_len) 424 { 425 int result; 426 427 /* don't submit s-g requests during abort processing */ 428 if (test_bit(US_FLIDX_ABORTING, &us->dflags)) 429 return USB_STOR_XFER_ERROR; 430 431 /* initialize the scatter-gather request block */ 432 US_DEBUGP("%s: xfer %u bytes, %d entries\n", __func__, 433 length, num_sg); 434 result = usb_sg_init(&us->current_sg, us->pusb_dev, pipe, 0, 435 sg, num_sg, length, GFP_NOIO); 436 if (result) { 437 US_DEBUGP("usb_sg_init returned %d\n", result); 438 return USB_STOR_XFER_ERROR; 439 } 440 441 /* since the block has been initialized successfully, it's now 442 * okay to cancel it */ 443 set_bit(US_FLIDX_SG_ACTIVE, &us->dflags); 444 445 /* did an abort occur during the submission? */ 446 if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { 447 448 /* cancel the request, if it hasn't been cancelled already */ 449 if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { 450 US_DEBUGP("-- cancelling sg request\n"); 451 usb_sg_cancel(&us->current_sg); 452 } 453 } 454 455 /* wait for the completion of the transfer */ 456 usb_sg_wait(&us->current_sg); 457 clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags); 458 459 result = us->current_sg.status; 460 if (act_len) 461 *act_len = us->current_sg.bytes; 462 return interpret_urb_result(us, pipe, length, result, 463 us->current_sg.bytes); 464 } 465 466 /* 467 * Common used function. Transfer a complete command 468 * via usb_stor_bulk_transfer_sglist() above. Set cmnd resid 469 */ 470 int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe, 471 struct scsi_cmnd* srb) 472 { 473 unsigned int partial; 474 int result = usb_stor_bulk_transfer_sglist(us, pipe, scsi_sglist(srb), 475 scsi_sg_count(srb), scsi_bufflen(srb), 476 &partial); 477 478 scsi_set_resid(srb, scsi_bufflen(srb) - partial); 479 return result; 480 } 481 EXPORT_SYMBOL_GPL(usb_stor_bulk_srb); 482 483 /* 484 * Transfer an entire SCSI command's worth of data payload over the bulk 485 * pipe. 486 * 487 * Note that this uses usb_stor_bulk_transfer_buf() and 488 * usb_stor_bulk_transfer_sglist() to achieve its goals -- 489 * this function simply determines whether we're going to use 490 * scatter-gather or not, and acts appropriately. 491 */ 492 int usb_stor_bulk_transfer_sg(struct us_data* us, unsigned int pipe, 493 void *buf, unsigned int length_left, int use_sg, int *residual) 494 { 495 int result; 496 unsigned int partial; 497 498 /* are we scatter-gathering? */ 499 if (use_sg) { 500 /* use the usb core scatter-gather primitives */ 501 result = usb_stor_bulk_transfer_sglist(us, pipe, 502 (struct scatterlist *) buf, use_sg, 503 length_left, &partial); 504 length_left -= partial; 505 } else { 506 /* no scatter-gather, just make the request */ 507 result = usb_stor_bulk_transfer_buf(us, pipe, buf, 508 length_left, &partial); 509 length_left -= partial; 510 } 511 512 /* store the residual and return the error code */ 513 if (residual) 514 *residual = length_left; 515 return result; 516 } 517 EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_sg); 518 519 /*********************************************************************** 520 * Transport routines 521 ***********************************************************************/ 522 523 /* There are so many devices that report the capacity incorrectly, 524 * this routine was written to counteract some of the resulting 525 * problems. 526 */ 527 static void last_sector_hacks(struct us_data *us, struct scsi_cmnd *srb) 528 { 529 struct gendisk *disk; 530 struct scsi_disk *sdkp; 531 u32 sector; 532 533 /* To Report "Medium Error: Record Not Found */ 534 static unsigned char record_not_found[18] = { 535 [0] = 0x70, /* current error */ 536 [2] = MEDIUM_ERROR, /* = 0x03 */ 537 [7] = 0x0a, /* additional length */ 538 [12] = 0x14 /* Record Not Found */ 539 }; 540 541 /* If last-sector problems can't occur, whether because the 542 * capacity was already decremented or because the device is 543 * known to report the correct capacity, then we don't need 544 * to do anything. 545 */ 546 if (!us->use_last_sector_hacks) 547 return; 548 549 /* Was this command a READ(10) or a WRITE(10)? */ 550 if (srb->cmnd[0] != READ_10 && srb->cmnd[0] != WRITE_10) 551 goto done; 552 553 /* Did this command access the last sector? */ 554 sector = (srb->cmnd[2] << 24) | (srb->cmnd[3] << 16) | 555 (srb->cmnd[4] << 8) | (srb->cmnd[5]); 556 disk = srb->request->rq_disk; 557 if (!disk) 558 goto done; 559 sdkp = scsi_disk(disk); 560 if (!sdkp) 561 goto done; 562 if (sector + 1 != sdkp->capacity) 563 goto done; 564 565 if (srb->result == SAM_STAT_GOOD && scsi_get_resid(srb) == 0) { 566 567 /* The command succeeded. We know this device doesn't 568 * have the last-sector bug, so stop checking it. 569 */ 570 us->use_last_sector_hacks = 0; 571 572 } else { 573 /* The command failed. Allow up to 3 retries in case this 574 * is some normal sort of failure. After that, assume the 575 * capacity is wrong and we're trying to access the sector 576 * beyond the end. Replace the result code and sense data 577 * with values that will cause the SCSI core to fail the 578 * command immediately, instead of going into an infinite 579 * (or even just a very long) retry loop. 580 */ 581 if (++us->last_sector_retries < 3) 582 return; 583 srb->result = SAM_STAT_CHECK_CONDITION; 584 memcpy(srb->sense_buffer, record_not_found, 585 sizeof(record_not_found)); 586 } 587 588 done: 589 /* Don't reset the retry counter for TEST UNIT READY commands, 590 * because they get issued after device resets which might be 591 * caused by a failed last-sector access. 592 */ 593 if (srb->cmnd[0] != TEST_UNIT_READY) 594 us->last_sector_retries = 0; 595 } 596 597 /* Invoke the transport and basic error-handling/recovery methods 598 * 599 * This is used by the protocol layers to actually send the message to 600 * the device and receive the response. 601 */ 602 void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) 603 { 604 int need_auto_sense; 605 int result; 606 607 /* send the command to the transport layer */ 608 scsi_set_resid(srb, 0); 609 result = us->transport(srb, us); 610 611 /* if the command gets aborted by the higher layers, we need to 612 * short-circuit all other processing 613 */ 614 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { 615 US_DEBUGP("-- command was aborted\n"); 616 srb->result = DID_ABORT << 16; 617 goto Handle_Errors; 618 } 619 620 /* if there is a transport error, reset and don't auto-sense */ 621 if (result == USB_STOR_TRANSPORT_ERROR) { 622 US_DEBUGP("-- transport indicates error, resetting\n"); 623 srb->result = DID_ERROR << 16; 624 goto Handle_Errors; 625 } 626 627 /* if the transport provided its own sense data, don't auto-sense */ 628 if (result == USB_STOR_TRANSPORT_NO_SENSE) { 629 srb->result = SAM_STAT_CHECK_CONDITION; 630 last_sector_hacks(us, srb); 631 return; 632 } 633 634 srb->result = SAM_STAT_GOOD; 635 636 /* Determine if we need to auto-sense 637 * 638 * I normally don't use a flag like this, but it's almost impossible 639 * to understand what's going on here if I don't. 640 */ 641 need_auto_sense = 0; 642 643 /* 644 * If we're running the CB transport, which is incapable 645 * of determining status on its own, we will auto-sense 646 * unless the operation involved a data-in transfer. Devices 647 * can signal most data-in errors by stalling the bulk-in pipe. 648 */ 649 if ((us->protocol == US_PR_CB || us->protocol == US_PR_DPCM_USB) && 650 srb->sc_data_direction != DMA_FROM_DEVICE) { 651 US_DEBUGP("-- CB transport device requiring auto-sense\n"); 652 need_auto_sense = 1; 653 } 654 655 /* 656 * If we have a failure, we're going to do a REQUEST_SENSE 657 * automatically. Note that we differentiate between a command 658 * "failure" and an "error" in the transport mechanism. 659 */ 660 if (result == USB_STOR_TRANSPORT_FAILED) { 661 US_DEBUGP("-- transport indicates command failure\n"); 662 need_auto_sense = 1; 663 } 664 665 /* 666 * Determine if this device is SAT by seeing if the 667 * command executed successfully. Otherwise we'll have 668 * to wait for at least one CHECK_CONDITION to determine 669 * SANE_SENSE support 670 */ 671 if ((srb->cmnd[0] == ATA_16 || srb->cmnd[0] == ATA_12) && 672 result == USB_STOR_TRANSPORT_GOOD && 673 !(us->fflags & US_FL_SANE_SENSE) && 674 !(srb->cmnd[2] & 0x20)) { 675 US_DEBUGP("-- SAT supported, increasing auto-sense\n"); 676 us->fflags |= US_FL_SANE_SENSE; 677 } 678 679 /* 680 * A short transfer on a command where we don't expect it 681 * is unusual, but it doesn't mean we need to auto-sense. 682 */ 683 if ((scsi_get_resid(srb) > 0) && 684 !((srb->cmnd[0] == REQUEST_SENSE) || 685 (srb->cmnd[0] == INQUIRY) || 686 (srb->cmnd[0] == MODE_SENSE) || 687 (srb->cmnd[0] == LOG_SENSE) || 688 (srb->cmnd[0] == MODE_SENSE_10))) { 689 US_DEBUGP("-- unexpectedly short transfer\n"); 690 } 691 692 /* Now, if we need to do the auto-sense, let's do it */ 693 if (need_auto_sense) { 694 int temp_result; 695 struct scsi_eh_save ses; 696 int sense_size = US_SENSE_SIZE; 697 698 /* device supports and needs bigger sense buffer */ 699 if (us->fflags & US_FL_SANE_SENSE) 700 sense_size = ~0; 701 702 US_DEBUGP("Issuing auto-REQUEST_SENSE\n"); 703 704 scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sense_size); 705 706 /* FIXME: we must do the protocol translation here */ 707 if (us->subclass == US_SC_RBC || us->subclass == US_SC_SCSI || 708 us->subclass == US_SC_CYP_ATACB) 709 srb->cmd_len = 6; 710 else 711 srb->cmd_len = 12; 712 713 /* issue the auto-sense command */ 714 scsi_set_resid(srb, 0); 715 temp_result = us->transport(us->srb, us); 716 717 /* let's clean up right away */ 718 scsi_eh_restore_cmnd(srb, &ses); 719 720 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { 721 US_DEBUGP("-- auto-sense aborted\n"); 722 srb->result = DID_ABORT << 16; 723 goto Handle_Errors; 724 } 725 if (temp_result != USB_STOR_TRANSPORT_GOOD) { 726 US_DEBUGP("-- auto-sense failure\n"); 727 728 /* we skip the reset if this happens to be a 729 * multi-target device, since failure of an 730 * auto-sense is perfectly valid 731 */ 732 srb->result = DID_ERROR << 16; 733 if (!(us->fflags & US_FL_SCM_MULT_TARG)) 734 goto Handle_Errors; 735 return; 736 } 737 738 /* If the sense data returned is larger than 18-bytes then we 739 * assume this device supports requesting more in the future. 740 * The response code must be 70h through 73h inclusive. 741 */ 742 if (srb->sense_buffer[7] > (US_SENSE_SIZE - 8) && 743 !(us->fflags & US_FL_SANE_SENSE) && 744 (srb->sense_buffer[0] & 0x7C) == 0x70) { 745 US_DEBUGP("-- SANE_SENSE support enabled\n"); 746 us->fflags |= US_FL_SANE_SENSE; 747 748 /* Indicate to the user that we truncated their sense 749 * because we didn't know it supported larger sense. 750 */ 751 US_DEBUGP("-- Sense data truncated to %i from %i\n", 752 US_SENSE_SIZE, 753 srb->sense_buffer[7] + 8); 754 srb->sense_buffer[7] = (US_SENSE_SIZE - 8); 755 } 756 757 US_DEBUGP("-- Result from auto-sense is %d\n", temp_result); 758 US_DEBUGP("-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n", 759 srb->sense_buffer[0], 760 srb->sense_buffer[2] & 0xf, 761 srb->sense_buffer[12], 762 srb->sense_buffer[13]); 763 #ifdef CONFIG_USB_STORAGE_DEBUG 764 usb_stor_show_sense( 765 srb->sense_buffer[2] & 0xf, 766 srb->sense_buffer[12], 767 srb->sense_buffer[13]); 768 #endif 769 770 /* set the result so the higher layers expect this data */ 771 srb->result = SAM_STAT_CHECK_CONDITION; 772 773 /* If things are really okay, then let's show that. Zero 774 * out the sense buffer so the higher layers won't realize 775 * we did an unsolicited auto-sense. */ 776 if (result == USB_STOR_TRANSPORT_GOOD && 777 /* Filemark 0, ignore EOM, ILI 0, no sense */ 778 (srb->sense_buffer[2] & 0xaf) == 0 && 779 /* No ASC or ASCQ */ 780 srb->sense_buffer[12] == 0 && 781 srb->sense_buffer[13] == 0) { 782 srb->result = SAM_STAT_GOOD; 783 srb->sense_buffer[0] = 0x0; 784 } 785 } 786 787 /* Did we transfer less than the minimum amount required? */ 788 if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) && 789 scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow) 790 srb->result = DID_ERROR << 16; 791 792 last_sector_hacks(us, srb); 793 return; 794 795 /* Error and abort processing: try to resynchronize with the device 796 * by issuing a port reset. If that fails, try a class-specific 797 * device reset. */ 798 Handle_Errors: 799 800 /* Set the RESETTING bit, and clear the ABORTING bit so that 801 * the reset may proceed. */ 802 scsi_lock(us_to_host(us)); 803 set_bit(US_FLIDX_RESETTING, &us->dflags); 804 clear_bit(US_FLIDX_ABORTING, &us->dflags); 805 scsi_unlock(us_to_host(us)); 806 807 /* We must release the device lock because the pre_reset routine 808 * will want to acquire it. */ 809 mutex_unlock(&us->dev_mutex); 810 result = usb_stor_port_reset(us); 811 mutex_lock(&us->dev_mutex); 812 813 if (result < 0) { 814 scsi_lock(us_to_host(us)); 815 usb_stor_report_device_reset(us); 816 scsi_unlock(us_to_host(us)); 817 us->transport_reset(us); 818 } 819 clear_bit(US_FLIDX_RESETTING, &us->dflags); 820 last_sector_hacks(us, srb); 821 } 822 823 /* Stop the current URB transfer */ 824 void usb_stor_stop_transport(struct us_data *us) 825 { 826 US_DEBUGP("%s called\n", __func__); 827 828 /* If the state machine is blocked waiting for an URB, 829 * let's wake it up. The test_and_clear_bit() call 830 * guarantees that if a URB has just been submitted, 831 * it won't be cancelled more than once. */ 832 if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { 833 US_DEBUGP("-- cancelling URB\n"); 834 usb_unlink_urb(us->current_urb); 835 } 836 837 /* If we are waiting for a scatter-gather operation, cancel it. */ 838 if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { 839 US_DEBUGP("-- cancelling sg request\n"); 840 usb_sg_cancel(&us->current_sg); 841 } 842 } 843 844 /* 845 * Control/Bulk and Control/Bulk/Interrupt transport 846 */ 847 848 int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us) 849 { 850 unsigned int transfer_length = scsi_bufflen(srb); 851 unsigned int pipe = 0; 852 int result; 853 854 /* COMMAND STAGE */ 855 /* let's send the command via the control pipe */ 856 result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe, 857 US_CBI_ADSC, 858 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, 859 us->ifnum, srb->cmnd, srb->cmd_len); 860 861 /* check the return code for the command */ 862 US_DEBUGP("Call to usb_stor_ctrl_transfer() returned %d\n", result); 863 864 /* if we stalled the command, it means command failed */ 865 if (result == USB_STOR_XFER_STALLED) { 866 return USB_STOR_TRANSPORT_FAILED; 867 } 868 869 /* Uh oh... serious problem here */ 870 if (result != USB_STOR_XFER_GOOD) { 871 return USB_STOR_TRANSPORT_ERROR; 872 } 873 874 /* DATA STAGE */ 875 /* transfer the data payload for this command, if one exists*/ 876 if (transfer_length) { 877 pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 878 us->recv_bulk_pipe : us->send_bulk_pipe; 879 result = usb_stor_bulk_srb(us, pipe, srb); 880 US_DEBUGP("CBI data stage result is 0x%x\n", result); 881 882 /* if we stalled the data transfer it means command failed */ 883 if (result == USB_STOR_XFER_STALLED) 884 return USB_STOR_TRANSPORT_FAILED; 885 if (result > USB_STOR_XFER_STALLED) 886 return USB_STOR_TRANSPORT_ERROR; 887 } 888 889 /* STATUS STAGE */ 890 891 /* NOTE: CB does not have a status stage. Silly, I know. So 892 * we have to catch this at a higher level. 893 */ 894 if (us->protocol != US_PR_CBI) 895 return USB_STOR_TRANSPORT_GOOD; 896 897 result = usb_stor_intr_transfer(us, us->iobuf, 2); 898 US_DEBUGP("Got interrupt data (0x%x, 0x%x)\n", 899 us->iobuf[0], us->iobuf[1]); 900 if (result != USB_STOR_XFER_GOOD) 901 return USB_STOR_TRANSPORT_ERROR; 902 903 /* UFI gives us ASC and ASCQ, like a request sense 904 * 905 * REQUEST_SENSE and INQUIRY don't affect the sense data on UFI 906 * devices, so we ignore the information for those commands. Note 907 * that this means we could be ignoring a real error on these 908 * commands, but that can't be helped. 909 */ 910 if (us->subclass == US_SC_UFI) { 911 if (srb->cmnd[0] == REQUEST_SENSE || 912 srb->cmnd[0] == INQUIRY) 913 return USB_STOR_TRANSPORT_GOOD; 914 if (us->iobuf[0]) 915 goto Failed; 916 return USB_STOR_TRANSPORT_GOOD; 917 } 918 919 /* If not UFI, we interpret the data as a result code 920 * The first byte should always be a 0x0. 921 * 922 * Some bogus devices don't follow that rule. They stuff the ASC 923 * into the first byte -- so if it's non-zero, call it a failure. 924 */ 925 if (us->iobuf[0]) { 926 US_DEBUGP("CBI IRQ data showed reserved bType 0x%x\n", 927 us->iobuf[0]); 928 goto Failed; 929 930 } 931 932 /* The second byte & 0x0F should be 0x0 for good, otherwise error */ 933 switch (us->iobuf[1] & 0x0F) { 934 case 0x00: 935 return USB_STOR_TRANSPORT_GOOD; 936 case 0x01: 937 goto Failed; 938 } 939 return USB_STOR_TRANSPORT_ERROR; 940 941 /* the CBI spec requires that the bulk pipe must be cleared 942 * following any data-in/out command failure (section 2.4.3.1.3) 943 */ 944 Failed: 945 if (pipe) 946 usb_stor_clear_halt(us, pipe); 947 return USB_STOR_TRANSPORT_FAILED; 948 } 949 EXPORT_SYMBOL_GPL(usb_stor_CB_transport); 950 951 /* 952 * Bulk only transport 953 */ 954 955 /* Determine what the maximum LUN supported is */ 956 int usb_stor_Bulk_max_lun(struct us_data *us) 957 { 958 int result; 959 960 /* issue the command */ 961 us->iobuf[0] = 0; 962 result = usb_stor_control_msg(us, us->recv_ctrl_pipe, 963 US_BULK_GET_MAX_LUN, 964 USB_DIR_IN | USB_TYPE_CLASS | 965 USB_RECIP_INTERFACE, 966 0, us->ifnum, us->iobuf, 1, HZ); 967 968 US_DEBUGP("GetMaxLUN command result is %d, data is %d\n", 969 result, us->iobuf[0]); 970 971 /* if we have a successful request, return the result */ 972 if (result > 0) 973 return us->iobuf[0]; 974 975 /* 976 * Some devices don't like GetMaxLUN. They may STALL the control 977 * pipe, they may return a zero-length result, they may do nothing at 978 * all and timeout, or they may fail in even more bizarrely creative 979 * ways. In these cases the best approach is to use the default 980 * value: only one LUN. 981 */ 982 return 0; 983 } 984 985 int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us) 986 { 987 struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf; 988 struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf; 989 unsigned int transfer_length = scsi_bufflen(srb); 990 unsigned int residue; 991 int result; 992 int fake_sense = 0; 993 unsigned int cswlen; 994 unsigned int cbwlen = US_BULK_CB_WRAP_LEN; 995 996 /* Take care of BULK32 devices; set extra byte to 0 */ 997 if (unlikely(us->fflags & US_FL_BULK32)) { 998 cbwlen = 32; 999 us->iobuf[31] = 0; 1000 } 1001 1002 /* set up the command wrapper */ 1003 bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); 1004 bcb->DataTransferLength = cpu_to_le32(transfer_length); 1005 bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? 1 << 7 : 0; 1006 bcb->Tag = ++us->tag; 1007 bcb->Lun = srb->device->lun; 1008 if (us->fflags & US_FL_SCM_MULT_TARG) 1009 bcb->Lun |= srb->device->id << 4; 1010 bcb->Length = srb->cmd_len; 1011 1012 /* copy the command payload */ 1013 memset(bcb->CDB, 0, sizeof(bcb->CDB)); 1014 memcpy(bcb->CDB, srb->cmnd, bcb->Length); 1015 1016 /* send it to out endpoint */ 1017 US_DEBUGP("Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n", 1018 le32_to_cpu(bcb->Signature), bcb->Tag, 1019 le32_to_cpu(bcb->DataTransferLength), bcb->Flags, 1020 (bcb->Lun >> 4), (bcb->Lun & 0x0F), 1021 bcb->Length); 1022 result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, 1023 bcb, cbwlen, NULL); 1024 US_DEBUGP("Bulk command transfer result=%d\n", result); 1025 if (result != USB_STOR_XFER_GOOD) 1026 return USB_STOR_TRANSPORT_ERROR; 1027 1028 /* DATA STAGE */ 1029 /* send/receive data payload, if there is any */ 1030 1031 /* Some USB-IDE converter chips need a 100us delay between the 1032 * command phase and the data phase. Some devices need a little 1033 * more than that, probably because of clock rate inaccuracies. */ 1034 if (unlikely(us->fflags & US_FL_GO_SLOW)) 1035 udelay(125); 1036 1037 if (transfer_length) { 1038 unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 1039 us->recv_bulk_pipe : us->send_bulk_pipe; 1040 result = usb_stor_bulk_srb(us, pipe, srb); 1041 US_DEBUGP("Bulk data transfer result 0x%x\n", result); 1042 if (result == USB_STOR_XFER_ERROR) 1043 return USB_STOR_TRANSPORT_ERROR; 1044 1045 /* If the device tried to send back more data than the 1046 * amount requested, the spec requires us to transfer 1047 * the CSW anyway. Since there's no point retrying the 1048 * the command, we'll return fake sense data indicating 1049 * Illegal Request, Invalid Field in CDB. 1050 */ 1051 if (result == USB_STOR_XFER_LONG) 1052 fake_sense = 1; 1053 } 1054 1055 /* See flow chart on pg 15 of the Bulk Only Transport spec for 1056 * an explanation of how this code works. 1057 */ 1058 1059 /* get CSW for device status */ 1060 US_DEBUGP("Attempting to get CSW...\n"); 1061 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 1062 bcs, US_BULK_CS_WRAP_LEN, &cswlen); 1063 1064 /* Some broken devices add unnecessary zero-length packets to the 1065 * end of their data transfers. Such packets show up as 0-length 1066 * CSWs. If we encounter such a thing, try to read the CSW again. 1067 */ 1068 if (result == USB_STOR_XFER_SHORT && cswlen == 0) { 1069 US_DEBUGP("Received 0-length CSW; retrying...\n"); 1070 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 1071 bcs, US_BULK_CS_WRAP_LEN, &cswlen); 1072 } 1073 1074 /* did the attempt to read the CSW fail? */ 1075 if (result == USB_STOR_XFER_STALLED) { 1076 1077 /* get the status again */ 1078 US_DEBUGP("Attempting to get CSW (2nd try)...\n"); 1079 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 1080 bcs, US_BULK_CS_WRAP_LEN, NULL); 1081 } 1082 1083 /* if we still have a failure at this point, we're in trouble */ 1084 US_DEBUGP("Bulk status result = %d\n", result); 1085 if (result != USB_STOR_XFER_GOOD) 1086 return USB_STOR_TRANSPORT_ERROR; 1087 1088 /* check bulk status */ 1089 residue = le32_to_cpu(bcs->Residue); 1090 US_DEBUGP("Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n", 1091 le32_to_cpu(bcs->Signature), bcs->Tag, 1092 residue, bcs->Status); 1093 if (!(bcs->Tag == us->tag || (us->fflags & US_FL_BULK_IGNORE_TAG)) || 1094 bcs->Status > US_BULK_STAT_PHASE) { 1095 US_DEBUGP("Bulk logical error\n"); 1096 return USB_STOR_TRANSPORT_ERROR; 1097 } 1098 1099 /* Some broken devices report odd signatures, so we do not check them 1100 * for validity against the spec. We store the first one we see, 1101 * and check subsequent transfers for validity against this signature. 1102 */ 1103 if (!us->bcs_signature) { 1104 us->bcs_signature = bcs->Signature; 1105 if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN)) 1106 US_DEBUGP("Learnt BCS signature 0x%08X\n", 1107 le32_to_cpu(us->bcs_signature)); 1108 } else if (bcs->Signature != us->bcs_signature) { 1109 US_DEBUGP("Signature mismatch: got %08X, expecting %08X\n", 1110 le32_to_cpu(bcs->Signature), 1111 le32_to_cpu(us->bcs_signature)); 1112 return USB_STOR_TRANSPORT_ERROR; 1113 } 1114 1115 /* try to compute the actual residue, based on how much data 1116 * was really transferred and what the device tells us */ 1117 if (residue && !(us->fflags & US_FL_IGNORE_RESIDUE)) { 1118 1119 /* Heuristically detect devices that generate bogus residues 1120 * by seeing what happens with INQUIRY and READ CAPACITY 1121 * commands. 1122 */ 1123 if (bcs->Status == US_BULK_STAT_OK && 1124 scsi_get_resid(srb) == 0 && 1125 ((srb->cmnd[0] == INQUIRY && 1126 transfer_length == 36) || 1127 (srb->cmnd[0] == READ_CAPACITY && 1128 transfer_length == 8))) { 1129 us->fflags |= US_FL_IGNORE_RESIDUE; 1130 1131 } else { 1132 residue = min(residue, transfer_length); 1133 scsi_set_resid(srb, max(scsi_get_resid(srb), 1134 (int) residue)); 1135 } 1136 } 1137 1138 /* based on the status code, we report good or bad */ 1139 switch (bcs->Status) { 1140 case US_BULK_STAT_OK: 1141 /* device babbled -- return fake sense data */ 1142 if (fake_sense) { 1143 memcpy(srb->sense_buffer, 1144 usb_stor_sense_invalidCDB, 1145 sizeof(usb_stor_sense_invalidCDB)); 1146 return USB_STOR_TRANSPORT_NO_SENSE; 1147 } 1148 1149 /* command good -- note that data could be short */ 1150 return USB_STOR_TRANSPORT_GOOD; 1151 1152 case US_BULK_STAT_FAIL: 1153 /* command failed */ 1154 return USB_STOR_TRANSPORT_FAILED; 1155 1156 case US_BULK_STAT_PHASE: 1157 /* phase error -- note that a transport reset will be 1158 * invoked by the invoke_transport() function 1159 */ 1160 return USB_STOR_TRANSPORT_ERROR; 1161 } 1162 1163 /* we should never get here, but if we do, we're in trouble */ 1164 return USB_STOR_TRANSPORT_ERROR; 1165 } 1166 EXPORT_SYMBOL_GPL(usb_stor_Bulk_transport); 1167 1168 /*********************************************************************** 1169 * Reset routines 1170 ***********************************************************************/ 1171 1172 /* This is the common part of the device reset code. 1173 * 1174 * It's handy that every transport mechanism uses the control endpoint for 1175 * resets. 1176 * 1177 * Basically, we send a reset with a 5-second timeout, so we don't get 1178 * jammed attempting to do the reset. 1179 */ 1180 static int usb_stor_reset_common(struct us_data *us, 1181 u8 request, u8 requesttype, 1182 u16 value, u16 index, void *data, u16 size) 1183 { 1184 int result; 1185 int result2; 1186 1187 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { 1188 US_DEBUGP("No reset during disconnect\n"); 1189 return -EIO; 1190 } 1191 1192 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 1193 request, requesttype, value, index, data, size, 1194 5*HZ); 1195 if (result < 0) { 1196 US_DEBUGP("Soft reset failed: %d\n", result); 1197 return result; 1198 } 1199 1200 /* Give the device some time to recover from the reset, 1201 * but don't delay disconnect processing. */ 1202 wait_event_interruptible_timeout(us->delay_wait, 1203 test_bit(US_FLIDX_DISCONNECTING, &us->dflags), 1204 HZ*6); 1205 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { 1206 US_DEBUGP("Reset interrupted by disconnect\n"); 1207 return -EIO; 1208 } 1209 1210 US_DEBUGP("Soft reset: clearing bulk-in endpoint halt\n"); 1211 result = usb_stor_clear_halt(us, us->recv_bulk_pipe); 1212 1213 US_DEBUGP("Soft reset: clearing bulk-out endpoint halt\n"); 1214 result2 = usb_stor_clear_halt(us, us->send_bulk_pipe); 1215 1216 /* return a result code based on the result of the clear-halts */ 1217 if (result >= 0) 1218 result = result2; 1219 if (result < 0) 1220 US_DEBUGP("Soft reset failed\n"); 1221 else 1222 US_DEBUGP("Soft reset done\n"); 1223 return result; 1224 } 1225 1226 /* This issues a CB[I] Reset to the device in question 1227 */ 1228 #define CB_RESET_CMD_SIZE 12 1229 1230 int usb_stor_CB_reset(struct us_data *us) 1231 { 1232 US_DEBUGP("%s called\n", __func__); 1233 1234 memset(us->iobuf, 0xFF, CB_RESET_CMD_SIZE); 1235 us->iobuf[0] = SEND_DIAGNOSTIC; 1236 us->iobuf[1] = 4; 1237 return usb_stor_reset_common(us, US_CBI_ADSC, 1238 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 1239 0, us->ifnum, us->iobuf, CB_RESET_CMD_SIZE); 1240 } 1241 EXPORT_SYMBOL_GPL(usb_stor_CB_reset); 1242 1243 /* This issues a Bulk-only Reset to the device in question, including 1244 * clearing the subsequent endpoint halts that may occur. 1245 */ 1246 int usb_stor_Bulk_reset(struct us_data *us) 1247 { 1248 US_DEBUGP("%s called\n", __func__); 1249 1250 return usb_stor_reset_common(us, US_BULK_RESET_REQUEST, 1251 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 1252 0, us->ifnum, NULL, 0); 1253 } 1254 EXPORT_SYMBOL_GPL(usb_stor_Bulk_reset); 1255 1256 /* Issue a USB port reset to the device. The caller must not hold 1257 * us->dev_mutex. 1258 */ 1259 int usb_stor_port_reset(struct us_data *us) 1260 { 1261 int result; 1262 1263 result = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf); 1264 if (result < 0) 1265 US_DEBUGP("unable to lock device for reset: %d\n", result); 1266 else { 1267 /* Were we disconnected while waiting for the lock? */ 1268 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { 1269 result = -EIO; 1270 US_DEBUGP("No reset during disconnect\n"); 1271 } else { 1272 result = usb_reset_device(us->pusb_dev); 1273 US_DEBUGP("usb_reset_device returns %d\n", 1274 result); 1275 } 1276 usb_unlock_device(us->pusb_dev); 1277 } 1278 return result; 1279 } 1280