1// SPDX-License-Identifier: GPL-2.0+ 2/* 3 * Driver for USB Mass Storage compliant devices 4 * 5 * Current development and maintenance by: 6 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net) 7 * 8 * Developed with the assistance of: 9 * (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org) 10 * (c) 2000 Stephen J. Gowdy (SGowdy@lbl.gov) 11 * (c) 2002 Alan Stern <stern@rowland.org> 12 * 13 * Initial work by: 14 * (c) 1999 Michael Gee (michael@linuxspecific.com) 15 * 16 * This driver is based on the 'USB Mass Storage Class' document. This 17 * describes in detail the protocol used to communicate with such 18 * devices. Clearly, the designers had SCSI and ATAPI commands in 19 * mind when they created this document. The commands are all very 20 * similar to commands in the SCSI-II and ATAPI specifications. 21 * 22 * It is important to note that in a number of cases this class 23 * exhibits class-specific exemptions from the USB specification. 24 * Notably the usage of NAK, STALL and ACK differs from the norm, in 25 * that they are used to communicate wait, failed and OK on commands. 26 * 27 * Also, for certain devices, the interrupt endpoint is used to convey 28 * status of a command. 29 */ 30 31#include <linux/sched.h> 32#include <linux/gfp.h> 33#include <linux/errno.h> 34#include <linux/export.h> 35 36#include <linux/usb/quirks.h> 37 38#include <scsi/scsi.h> 39#include <scsi/scsi_eh.h> 40#include <scsi/scsi_device.h> 41 42#include "usb.h" 43#include "transport.h" 44#include "protocol.h" 45#include "scsiglue.h" 46#include "debug.h" 47 48#include <linux/blkdev.h> 49#include "../../scsi/sd.h" 50 51 52/*********************************************************************** 53 * Data transfer routines 54 ***********************************************************************/ 55 56/* 57 * This is subtle, so pay attention: 58 * --------------------------------- 59 * We're very concerned about races with a command abort. Hanging this code 60 * is a sure fire way to hang the kernel. (Note that this discussion applies 61 * only to transactions resulting from a scsi queued-command, since only 62 * these transactions are subject to a scsi abort. Other transactions, such 63 * as those occurring during device-specific initialization, must be handled 64 * by a separate code path.) 65 * 66 * The abort function (usb_storage_command_abort() in scsiglue.c) first 67 * sets the machine state and the ABORTING bit in us->dflags to prevent 68 * new URBs from being submitted. It then calls usb_stor_stop_transport() 69 * below, which atomically tests-and-clears the URB_ACTIVE bit in us->dflags 70 * to see if the current_urb needs to be stopped. Likewise, the SG_ACTIVE 71 * bit is tested to see if the current_sg scatter-gather request needs to be 72 * stopped. The timeout callback routine does much the same thing. 73 * 74 * When a disconnect occurs, the DISCONNECTING bit in us->dflags is set to 75 * prevent new URBs from being submitted, and usb_stor_stop_transport() is 76 * called to stop any ongoing requests. 77 * 78 * The submit function first verifies that the submitting is allowed 79 * (neither ABORTING nor DISCONNECTING bits are set) and that the submit 80 * completes without errors, and only then sets the URB_ACTIVE bit. This 81 * prevents the stop_transport() function from trying to cancel the URB 82 * while the submit call is underway. Next, the submit function must test 83 * the flags to see if an abort or disconnect occurred during the submission 84 * or before the URB_ACTIVE bit was set. If so, it's essential to cancel 85 * the URB if it hasn't been cancelled already (i.e., if the URB_ACTIVE bit 86 * is still set). Either way, the function must then wait for the URB to 87 * finish. Note that the URB can still be in progress even after a call to 88 * usb_unlink_urb() returns. 89 * 90 * The idea is that (1) once the ABORTING or DISCONNECTING bit is set, 91 * either the stop_transport() function or the submitting function 92 * is guaranteed to call usb_unlink_urb() for an active URB, 93 * and (2) test_and_clear_bit() prevents usb_unlink_urb() from being 94 * called more than once or from being called during usb_submit_urb(). 95 */ 96 97/* 98 * This is the completion handler which will wake us up when an URB 99 * completes. 100 */ 101static void usb_stor_blocking_completion(struct urb *urb) 102{ 103 struct completion *urb_done_ptr = urb->context; 104 105 complete(urb_done_ptr); 106} 107 108/* 109 * This is the common part of the URB message submission code 110 * 111 * All URBs from the usb-storage driver involved in handling a queued scsi 112 * command _must_ pass through this function (or something like it) for the 113 * abort mechanisms to work properly. 114 */ 115static int usb_stor_msg_common(struct us_data *us, int timeout) 116{ 117 struct completion urb_done; 118 long timeleft; 119 int status; 120 121 /* don't submit URBs during abort processing */ 122 if (test_bit(US_FLIDX_ABORTING, &us->dflags)) 123 return -EIO; 124 125 /* set up data structures for the wakeup system */ 126 init_completion(&urb_done); 127 128 /* fill the common fields in the URB */ 129 us->current_urb->context = &urb_done; 130 us->current_urb->transfer_flags = 0; 131 132 /* 133 * we assume that if transfer_buffer isn't us->iobuf then it 134 * hasn't been mapped for DMA. Yes, this is clunky, but it's 135 * easier than always having the caller tell us whether the 136 * transfer buffer has already been mapped. 137 */ 138 if (us->current_urb->transfer_buffer == us->iobuf) 139 us->current_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 140 us->current_urb->transfer_dma = us->iobuf_dma; 141 142 /* submit the URB */ 143 status = usb_submit_urb(us->current_urb, GFP_NOIO); 144 if (status) { 145 /* something went wrong */ 146 return status; 147 } 148 149 /* 150 * since the URB has been submitted successfully, it's now okay 151 * to cancel it 152 */ 153 set_bit(US_FLIDX_URB_ACTIVE, &us->dflags); 154 155 /* did an abort occur during the submission? */ 156 if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { 157 158 /* cancel the URB, if it hasn't been cancelled already */ 159 if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { 160 usb_stor_dbg(us, "-- cancelling URB\n"); 161 usb_unlink_urb(us->current_urb); 162 } 163 } 164 165 /* wait for the completion of the URB */ 166 timeleft = wait_for_completion_interruptible_timeout( 167 &urb_done, timeout ? : MAX_SCHEDULE_TIMEOUT); 168 169 clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags); 170 171 if (timeleft <= 0) { 172 usb_stor_dbg(us, "%s -- cancelling URB\n", 173 timeleft == 0 ? "Timeout" : "Signal"); 174 usb_kill_urb(us->current_urb); 175 } 176 177 /* return the URB status */ 178 return us->current_urb->status; 179} 180 181/* 182 * Transfer one control message, with timeouts, and allowing early 183 * termination. Return codes are usual -Exxx, *not* USB_STOR_XFER_xxx. 184 */ 185int usb_stor_control_msg(struct us_data *us, unsigned int pipe, 186 u8 request, u8 requesttype, u16 value, u16 index, 187 void *data, u16 size, int timeout) 188{ 189 int status; 190 191 usb_stor_dbg(us, "rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", 192 request, requesttype, value, index, size); 193 194 /* fill in the devrequest structure */ 195 us->cr->bRequestType = requesttype; 196 us->cr->bRequest = request; 197 us->cr->wValue = cpu_to_le16(value); 198 us->cr->wIndex = cpu_to_le16(index); 199 us->cr->wLength = cpu_to_le16(size); 200 201 /* fill and submit the URB */ 202 usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, 203 (unsigned char*) us->cr, data, size, 204 usb_stor_blocking_completion, NULL); 205 status = usb_stor_msg_common(us, timeout); 206 207 /* return the actual length of the data transferred if no error */ 208 if (status == 0) 209 status = us->current_urb->actual_length; 210 return status; 211} 212EXPORT_SYMBOL_GPL(usb_stor_control_msg); 213 214/* 215 * This is a version of usb_clear_halt() that allows early termination and 216 * doesn't read the status from the device -- this is because some devices 217 * crash their internal firmware when the status is requested after a halt. 218 * 219 * A definitive list of these 'bad' devices is too difficult to maintain or 220 * make complete enough to be useful. This problem was first observed on the 221 * Hagiwara FlashGate DUAL unit. However, bus traces reveal that neither 222 * MacOS nor Windows checks the status after clearing a halt. 223 * 224 * Since many vendors in this space limit their testing to interoperability 225 * with these two OSes, specification violations like this one are common. 226 */ 227int usb_stor_clear_halt(struct us_data *us, unsigned int pipe) 228{ 229 int result; 230 int endp = usb_pipeendpoint(pipe); 231 232 if (usb_pipein (pipe)) 233 endp |= USB_DIR_IN; 234 235 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 236 USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, 237 USB_ENDPOINT_HALT, endp, 238 NULL, 0, 3*HZ); 239 240 if (result >= 0) 241 usb_reset_endpoint(us->pusb_dev, endp); 242 243 usb_stor_dbg(us, "result = %d\n", result); 244 return result; 245} 246EXPORT_SYMBOL_GPL(usb_stor_clear_halt); 247 248 249/* 250 * Interpret the results of a URB transfer 251 * 252 * This function prints appropriate debugging messages, clears halts on 253 * non-control endpoints, and translates the status to the corresponding 254 * USB_STOR_XFER_xxx return code. 255 */ 256static int interpret_urb_result(struct us_data *us, unsigned int pipe, 257 unsigned int length, int result, unsigned int partial) 258{ 259 usb_stor_dbg(us, "Status code %d; transferred %u/%u\n", 260 result, partial, length); 261 switch (result) { 262 263 /* no error code; did we send all the data? */ 264 case 0: 265 if (partial != length) { 266 usb_stor_dbg(us, "-- short transfer\n"); 267 return USB_STOR_XFER_SHORT; 268 } 269 270 usb_stor_dbg(us, "-- transfer complete\n"); 271 return USB_STOR_XFER_GOOD; 272 273 /* stalled */ 274 case -EPIPE: 275 /* 276 * for control endpoints, (used by CB[I]) a stall indicates 277 * a failed command 278 */ 279 if (usb_pipecontrol(pipe)) { 280 usb_stor_dbg(us, "-- stall on control pipe\n"); 281 return USB_STOR_XFER_STALLED; 282 } 283 284 /* for other sorts of endpoint, clear the stall */ 285 usb_stor_dbg(us, "clearing endpoint halt for pipe 0x%x\n", 286 pipe); 287 if (usb_stor_clear_halt(us, pipe) < 0) 288 return USB_STOR_XFER_ERROR; 289 return USB_STOR_XFER_STALLED; 290 291 /* babble - the device tried to send more than we wanted to read */ 292 case -EOVERFLOW: 293 usb_stor_dbg(us, "-- babble\n"); 294 return USB_STOR_XFER_LONG; 295 296 /* the transfer was cancelled by abort, disconnect, or timeout */ 297 case -ECONNRESET: 298 usb_stor_dbg(us, "-- transfer cancelled\n"); 299 return USB_STOR_XFER_ERROR; 300 301 /* short scatter-gather read transfer */ 302 case -EREMOTEIO: 303 usb_stor_dbg(us, "-- short read transfer\n"); 304 return USB_STOR_XFER_SHORT; 305 306 /* abort or disconnect in progress */ 307 case -EIO: 308 usb_stor_dbg(us, "-- abort or disconnect in progress\n"); 309 return USB_STOR_XFER_ERROR; 310 311 /* the catch-all error case */ 312 default: 313 usb_stor_dbg(us, "-- unknown error\n"); 314 return USB_STOR_XFER_ERROR; 315 } 316} 317 318/* 319 * Transfer one control message, without timeouts, but allowing early 320 * termination. Return codes are USB_STOR_XFER_xxx. 321 */ 322int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe, 323 u8 request, u8 requesttype, u16 value, u16 index, 324 void *data, u16 size) 325{ 326 int result; 327 328 usb_stor_dbg(us, "rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", 329 request, requesttype, value, index, size); 330 331 /* fill in the devrequest structure */ 332 us->cr->bRequestType = requesttype; 333 us->cr->bRequest = request; 334 us->cr->wValue = cpu_to_le16(value); 335 us->cr->wIndex = cpu_to_le16(index); 336 us->cr->wLength = cpu_to_le16(size); 337 338 /* fill and submit the URB */ 339 usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, 340 (unsigned char*) us->cr, data, size, 341 usb_stor_blocking_completion, NULL); 342 result = usb_stor_msg_common(us, 0); 343 344 return interpret_urb_result(us, pipe, size, result, 345 us->current_urb->actual_length); 346} 347EXPORT_SYMBOL_GPL(usb_stor_ctrl_transfer); 348 349/* 350 * Receive one interrupt buffer, without timeouts, but allowing early 351 * termination. Return codes are USB_STOR_XFER_xxx. 352 * 353 * This routine always uses us->recv_intr_pipe as the pipe and 354 * us->ep_bInterval as the interrupt interval. 355 */ 356static int usb_stor_intr_transfer(struct us_data *us, void *buf, 357 unsigned int length) 358{ 359 int result; 360 unsigned int pipe = us->recv_intr_pipe; 361 unsigned int maxp; 362 363 usb_stor_dbg(us, "xfer %u bytes\n", length); 364 365 /* calculate the max packet size */ 366 maxp = usb_maxpacket(us->pusb_dev, pipe); 367 if (maxp > length) 368 maxp = length; 369 370 /* fill and submit the URB */ 371 usb_fill_int_urb(us->current_urb, us->pusb_dev, pipe, buf, 372 maxp, usb_stor_blocking_completion, NULL, 373 us->ep_bInterval); 374 result = usb_stor_msg_common(us, 0); 375 376 return interpret_urb_result(us, pipe, length, result, 377 us->current_urb->actual_length); 378} 379 380/* 381 * Transfer one buffer via bulk pipe, without timeouts, but allowing early 382 * termination. Return codes are USB_STOR_XFER_xxx. If the bulk pipe 383 * stalls during the transfer, the halt is automatically cleared. 384 */ 385int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe, 386 void *buf, unsigned int length, unsigned int *act_len) 387{ 388 int result; 389 390 usb_stor_dbg(us, "xfer %u bytes\n", length); 391 392 /* fill and submit the URB */ 393 usb_fill_bulk_urb(us->current_urb, us->pusb_dev, pipe, buf, length, 394 usb_stor_blocking_completion, NULL); 395 result = usb_stor_msg_common(us, 0); 396 397 /* store the actual length of the data transferred */ 398 if (act_len) 399 *act_len = us->current_urb->actual_length; 400 return interpret_urb_result(us, pipe, length, result, 401 us->current_urb->actual_length); 402} 403EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_buf); 404 405/* 406 * Transfer a scatter-gather list via bulk transfer 407 * 408 * This function does basically the same thing as usb_stor_bulk_transfer_buf() 409 * above, but it uses the usbcore scatter-gather library. 410 */ 411static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe, 412 struct scatterlist *sg, int num_sg, unsigned int length, 413 unsigned int *act_len) 414{ 415 int result; 416 417 /* don't submit s-g requests during abort processing */ 418 if (test_bit(US_FLIDX_ABORTING, &us->dflags)) 419 goto usb_stor_xfer_error; 420 421 /* initialize the scatter-gather request block */ 422 usb_stor_dbg(us, "xfer %u bytes, %d entries\n", length, num_sg); 423 result = usb_sg_init(&us->current_sg, us->pusb_dev, pipe, 0, 424 sg, num_sg, length, GFP_NOIO); 425 if (result) { 426 usb_stor_dbg(us, "usb_sg_init returned %d\n", result); 427 goto usb_stor_xfer_error; 428 } 429 430 /* 431 * since the block has been initialized successfully, it's now 432 * okay to cancel it 433 */ 434 set_bit(US_FLIDX_SG_ACTIVE, &us->dflags); 435 436 /* did an abort occur during the submission? */ 437 if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { 438 439 /* cancel the request, if it hasn't been cancelled already */ 440 if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { 441 usb_stor_dbg(us, "-- cancelling sg request\n"); 442 usb_sg_cancel(&us->current_sg); 443 } 444 } 445 446 /* wait for the completion of the transfer */ 447 usb_sg_wait(&us->current_sg); 448 clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags); 449 450 result = us->current_sg.status; 451 if (act_len) 452 *act_len = us->current_sg.bytes; 453 return interpret_urb_result(us, pipe, length, result, 454 us->current_sg.bytes); 455 456usb_stor_xfer_error: 457 if (act_len) 458 *act_len = 0; 459 return USB_STOR_XFER_ERROR; 460} 461 462/* 463 * Common used function. Transfer a complete command 464 * via usb_stor_bulk_transfer_sglist() above. Set cmnd resid 465 */ 466int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe, 467 struct scsi_cmnd* srb) 468{ 469 unsigned int partial; 470 int result = usb_stor_bulk_transfer_sglist(us, pipe, scsi_sglist(srb), 471 scsi_sg_count(srb), scsi_bufflen(srb), 472 &partial); 473 474 scsi_set_resid(srb, scsi_bufflen(srb) - partial); 475 return result; 476} 477EXPORT_SYMBOL_GPL(usb_stor_bulk_srb); 478 479/* 480 * Transfer an entire SCSI command's worth of data payload over the bulk 481 * pipe. 482 * 483 * Note that this uses usb_stor_bulk_transfer_buf() and 484 * usb_stor_bulk_transfer_sglist() to achieve its goals -- 485 * this function simply determines whether we're going to use 486 * scatter-gather or not, and acts appropriately. 487 */ 488int usb_stor_bulk_transfer_sg(struct us_data* us, unsigned int pipe, 489 void *buf, unsigned int length_left, int use_sg, int *residual) 490{ 491 int result; 492 unsigned int partial; 493 494 /* are we scatter-gathering? */ 495 if (use_sg) { 496 /* use the usb core scatter-gather primitives */ 497 result = usb_stor_bulk_transfer_sglist(us, pipe, 498 (struct scatterlist *) buf, use_sg, 499 length_left, &partial); 500 length_left -= partial; 501 } else { 502 /* no scatter-gather, just make the request */ 503 result = usb_stor_bulk_transfer_buf(us, pipe, buf, 504 length_left, &partial); 505 length_left -= partial; 506 } 507 508 /* store the residual and return the error code */ 509 if (residual) 510 *residual = length_left; 511 return result; 512} 513EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_sg); 514 515/*********************************************************************** 516 * Transport routines 517 ***********************************************************************/ 518 519/* 520 * There are so many devices that report the capacity incorrectly, 521 * this routine was written to counteract some of the resulting 522 * problems. 523 */ 524static void last_sector_hacks(struct us_data *us, struct scsi_cmnd *srb) 525{ 526 struct gendisk *disk; 527 struct scsi_disk *sdkp; 528 u32 sector; 529 530 /* To Report "Medium Error: Record Not Found */ 531 static unsigned char record_not_found[18] = { 532 [0] = 0x70, /* current error */ 533 [2] = MEDIUM_ERROR, /* = 0x03 */ 534 [7] = 0x0a, /* additional length */ 535 [12] = 0x14 /* Record Not Found */ 536 }; 537 538 /* 539 * If last-sector problems can't occur, whether because the 540 * capacity was already decremented or because the device is 541 * known to report the correct capacity, then we don't need 542 * to do anything. 543 */ 544 if (!us->use_last_sector_hacks) 545 return; 546 547 /* Was this command a READ(10) or a WRITE(10)? */ 548 if (srb->cmnd[0] != READ_10 && srb->cmnd[0] != WRITE_10) 549 goto done; 550 551 /* Did this command access the last sector? */ 552 sector = (srb->cmnd[2] << 24) | (srb->cmnd[3] << 16) | 553 (srb->cmnd[4] << 8) | (srb->cmnd[5]); 554 disk = scsi_cmd_to_rq(srb)->q->disk; 555 if (!disk) 556 goto done; 557 sdkp = scsi_disk(disk); 558 if (!sdkp) 559 goto done; 560 if (sector + 1 != sdkp->capacity) 561 goto done; 562 563 if (srb->result == SAM_STAT_GOOD && scsi_get_resid(srb) == 0) { 564 565 /* 566 * The command succeeded. We know this device doesn't 567 * have the last-sector bug, so stop checking it. 568 */ 569 us->use_last_sector_hacks = 0; 570 571 } else { 572 /* 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 /* 590 * Don't reset the retry counter for TEST UNIT READY commands, 591 * because they get issued after device resets which might be 592 * caused by a failed last-sector access. 593 */ 594 if (srb->cmnd[0] != TEST_UNIT_READY) 595 us->last_sector_retries = 0; 596} 597 598/* 599 * Invoke the transport and basic error-handling/recovery methods 600 * 601 * This is used by the protocol layers to actually send the message to 602 * the device and receive the response. 603 */ 604void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) 605{ 606 int need_auto_sense; 607 int result; 608 609 /* send the command to the transport layer */ 610 scsi_set_resid(srb, 0); 611 result = us->transport(srb, us); 612 613 /* 614 * if the command gets aborted by the higher layers, we need to 615 * short-circuit all other processing 616 */ 617 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { 618 usb_stor_dbg(us, "-- command was aborted\n"); 619 srb->result = DID_ABORT << 16; 620 goto Handle_Errors; 621 } 622 623 /* if there is a transport error, reset and don't auto-sense */ 624 if (result == USB_STOR_TRANSPORT_ERROR) { 625 usb_stor_dbg(us, "-- transport indicates error, resetting\n"); 626 srb->result = DID_ERROR << 16; 627 goto Handle_Errors; 628 } 629 630 /* if the transport provided its own sense data, don't auto-sense */ 631 if (result == USB_STOR_TRANSPORT_NO_SENSE) { 632 srb->result = SAM_STAT_CHECK_CONDITION; 633 last_sector_hacks(us, srb); 634 return; 635 } 636 637 srb->result = SAM_STAT_GOOD; 638 639 /* 640 * Determine if we need to auto-sense 641 * 642 * I normally don't use a flag like this, but it's almost impossible 643 * to understand what's going on here if I don't. 644 */ 645 need_auto_sense = 0; 646 647 /* 648 * If we're running the CB transport, which is incapable 649 * of determining status on its own, we will auto-sense 650 * unless the operation involved a data-in transfer. Devices 651 * can signal most data-in errors by stalling the bulk-in pipe. 652 */ 653 if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_DPCM_USB) && 654 srb->sc_data_direction != DMA_FROM_DEVICE) { 655 usb_stor_dbg(us, "-- CB transport device requiring auto-sense\n"); 656 need_auto_sense = 1; 657 } 658 659 /* Some devices (Kindle) require another command after SYNC CACHE */ 660 if ((us->fflags & US_FL_SENSE_AFTER_SYNC) && 661 srb->cmnd[0] == SYNCHRONIZE_CACHE) { 662 usb_stor_dbg(us, "-- sense after SYNC CACHE\n"); 663 need_auto_sense = 1; 664 } 665 666 /* 667 * If we have a failure, we're going to do a REQUEST_SENSE 668 * automatically. Note that we differentiate between a command 669 * "failure" and an "error" in the transport mechanism. 670 */ 671 if (result == USB_STOR_TRANSPORT_FAILED) { 672 usb_stor_dbg(us, "-- transport indicates command failure\n"); 673 need_auto_sense = 1; 674 } 675 676 /* 677 * Determine if this device is SAT by seeing if the 678 * command executed successfully. Otherwise we'll have 679 * to wait for at least one CHECK_CONDITION to determine 680 * SANE_SENSE support 681 */ 682 if (unlikely((srb->cmnd[0] == ATA_16 || srb->cmnd[0] == ATA_12) && 683 result == USB_STOR_TRANSPORT_GOOD && 684 !(us->fflags & US_FL_SANE_SENSE) && 685 !(us->fflags & US_FL_BAD_SENSE) && 686 !(srb->cmnd[2] & 0x20))) { 687 usb_stor_dbg(us, "-- SAT supported, increasing auto-sense\n"); 688 us->fflags |= US_FL_SANE_SENSE; 689 } 690 691 /* 692 * A short transfer on a command where we don't expect it 693 * is unusual, but it doesn't mean we need to auto-sense. 694 */ 695 if ((scsi_get_resid(srb) > 0) && 696 !((srb->cmnd[0] == REQUEST_SENSE) || 697 (srb->cmnd[0] == INQUIRY) || 698 (srb->cmnd[0] == MODE_SENSE) || 699 (srb->cmnd[0] == LOG_SENSE) || 700 (srb->cmnd[0] == MODE_SENSE_10))) { 701 usb_stor_dbg(us, "-- unexpectedly short transfer\n"); 702 } 703 704 /* Now, if we need to do the auto-sense, let's do it */ 705 if (need_auto_sense) { 706 int temp_result; 707 struct scsi_eh_save ses; 708 int sense_size = US_SENSE_SIZE; 709 struct scsi_sense_hdr sshdr; 710 const u8 *scdd; 711 u8 fm_ili; 712 713 /* device supports and needs bigger sense buffer */ 714 if (us->fflags & US_FL_SANE_SENSE) 715 sense_size = ~0; 716Retry_Sense: 717 usb_stor_dbg(us, "Issuing auto-REQUEST_SENSE\n"); 718 719 scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sense_size); 720 721 /* FIXME: we must do the protocol translation here */ 722 if (us->subclass == USB_SC_RBC || us->subclass == USB_SC_SCSI || 723 us->subclass == USB_SC_CYP_ATACB) 724 srb->cmd_len = 6; 725 else 726 srb->cmd_len = 12; 727 728 /* issue the auto-sense command */ 729 scsi_set_resid(srb, 0); 730 temp_result = us->transport(us->srb, us); 731 732 /* let's clean up right away */ 733 scsi_eh_restore_cmnd(srb, &ses); 734 735 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { 736 usb_stor_dbg(us, "-- auto-sense aborted\n"); 737 srb->result = DID_ABORT << 16; 738 739 /* If SANE_SENSE caused this problem, disable it */ 740 if (sense_size != US_SENSE_SIZE) { 741 us->fflags &= ~US_FL_SANE_SENSE; 742 us->fflags |= US_FL_BAD_SENSE; 743 } 744 goto Handle_Errors; 745 } 746 747 /* 748 * Some devices claim to support larger sense but fail when 749 * trying to request it. When a transport failure happens 750 * using US_FS_SANE_SENSE, we always retry with a standard 751 * (small) sense request. This fixes some USB GSM modems 752 */ 753 if (temp_result == USB_STOR_TRANSPORT_FAILED && 754 sense_size != US_SENSE_SIZE) { 755 usb_stor_dbg(us, "-- auto-sense failure, retry small sense\n"); 756 sense_size = US_SENSE_SIZE; 757 us->fflags &= ~US_FL_SANE_SENSE; 758 us->fflags |= US_FL_BAD_SENSE; 759 goto Retry_Sense; 760 } 761 762 /* Other failures */ 763 if (temp_result != USB_STOR_TRANSPORT_GOOD) { 764 usb_stor_dbg(us, "-- auto-sense failure\n"); 765 766 /* 767 * we skip the reset if this happens to be a 768 * multi-target device, since failure of an 769 * auto-sense is perfectly valid 770 */ 771 srb->result = DID_ERROR << 16; 772 if (!(us->fflags & US_FL_SCM_MULT_TARG)) 773 goto Handle_Errors; 774 return; 775 } 776 777 /* 778 * If the sense data returned is larger than 18-bytes then we 779 * assume this device supports requesting more in the future. 780 * The response code must be 70h through 73h inclusive. 781 */ 782 if (srb->sense_buffer[7] > (US_SENSE_SIZE - 8) && 783 !(us->fflags & US_FL_SANE_SENSE) && 784 !(us->fflags & US_FL_BAD_SENSE) && 785 (srb->sense_buffer[0] & 0x7C) == 0x70) { 786 usb_stor_dbg(us, "-- SANE_SENSE support enabled\n"); 787 us->fflags |= US_FL_SANE_SENSE; 788 789 /* 790 * Indicate to the user that we truncated their sense 791 * because we didn't know it supported larger sense. 792 */ 793 usb_stor_dbg(us, "-- Sense data truncated to %i from %i\n", 794 US_SENSE_SIZE, 795 srb->sense_buffer[7] + 8); 796 srb->sense_buffer[7] = (US_SENSE_SIZE - 8); 797 } 798 799 scsi_normalize_sense(srb->sense_buffer, SCSI_SENSE_BUFFERSIZE, 800 &sshdr); 801 802 usb_stor_dbg(us, "-- Result from auto-sense is %d\n", 803 temp_result); 804 usb_stor_dbg(us, "-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n", 805 sshdr.response_code, sshdr.sense_key, 806 sshdr.asc, sshdr.ascq); 807#ifdef CONFIG_USB_STORAGE_DEBUG 808 usb_stor_show_sense(us, sshdr.sense_key, sshdr.asc, sshdr.ascq); 809#endif 810 811 /* set the result so the higher layers expect this data */ 812 srb->result = SAM_STAT_CHECK_CONDITION; 813 814 scdd = scsi_sense_desc_find(srb->sense_buffer, 815 SCSI_SENSE_BUFFERSIZE, 4); 816 fm_ili = (scdd ? scdd[3] : srb->sense_buffer[2]) & 0xA0; 817 818 /* 819 * We often get empty sense data. This could indicate that 820 * everything worked or that there was an unspecified 821 * problem. We have to decide which. 822 */ 823 if (sshdr.sense_key == 0 && sshdr.asc == 0 && sshdr.ascq == 0 && 824 fm_ili == 0) { 825 /* 826 * If things are really okay, then let's show that. 827 * Zero out the sense buffer so the higher layers 828 * won't realize we did an unsolicited auto-sense. 829 */ 830 if (result == USB_STOR_TRANSPORT_GOOD) { 831 srb->result = SAM_STAT_GOOD; 832 srb->sense_buffer[0] = 0x0; 833 } 834 835 /* 836 * ATA-passthru commands use sense data to report 837 * the command completion status, and often devices 838 * return Check Condition status when nothing is 839 * wrong. 840 */ 841 else if (srb->cmnd[0] == ATA_16 || 842 srb->cmnd[0] == ATA_12) { 843 /* leave the data alone */ 844 } 845 846 /* 847 * If there was a problem, report an unspecified 848 * hardware error to prevent the higher layers from 849 * entering an infinite retry loop. 850 */ 851 else { 852 srb->result = DID_ERROR << 16; 853 if ((sshdr.response_code & 0x72) == 0x72) 854 srb->sense_buffer[1] = HARDWARE_ERROR; 855 else 856 srb->sense_buffer[2] = HARDWARE_ERROR; 857 } 858 } 859 } 860 861 /* 862 * Some devices don't work or return incorrect data the first 863 * time they get a READ(10) command, or for the first READ(10) 864 * after a media change. If the INITIAL_READ10 flag is set, 865 * keep track of whether READ(10) commands succeed. If the 866 * previous one succeeded and this one failed, set the REDO_READ10 867 * flag to force a retry. 868 */ 869 if (unlikely((us->fflags & US_FL_INITIAL_READ10) && 870 srb->cmnd[0] == READ_10)) { 871 if (srb->result == SAM_STAT_GOOD) { 872 set_bit(US_FLIDX_READ10_WORKED, &us->dflags); 873 } else if (test_bit(US_FLIDX_READ10_WORKED, &us->dflags)) { 874 clear_bit(US_FLIDX_READ10_WORKED, &us->dflags); 875 set_bit(US_FLIDX_REDO_READ10, &us->dflags); 876 } 877 878 /* 879 * Next, if the REDO_READ10 flag is set, return a result 880 * code that will cause the SCSI core to retry the READ(10) 881 * command immediately. 882 */ 883 if (test_bit(US_FLIDX_REDO_READ10, &us->dflags)) { 884 clear_bit(US_FLIDX_REDO_READ10, &us->dflags); 885 srb->result = DID_IMM_RETRY << 16; 886 srb->sense_buffer[0] = 0; 887 } 888 } 889 890 /* Did we transfer less than the minimum amount required? */ 891 if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) && 892 scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow) 893 srb->result = DID_ERROR << 16; 894 895 last_sector_hacks(us, srb); 896 return; 897 898 /* 899 * Error and abort processing: try to resynchronize with the device 900 * by issuing a port reset. If that fails, try a class-specific 901 * device reset. 902 */ 903 Handle_Errors: 904 905 /* 906 * Set the RESETTING bit, and clear the ABORTING bit so that 907 * the reset may proceed. 908 */ 909 scsi_lock(us_to_host(us)); 910 set_bit(US_FLIDX_RESETTING, &us->dflags); 911 clear_bit(US_FLIDX_ABORTING, &us->dflags); 912 scsi_unlock(us_to_host(us)); 913 914 /* 915 * We must release the device lock because the pre_reset routine 916 * will want to acquire it. 917 */ 918 mutex_unlock(&us->dev_mutex); 919 result = usb_stor_port_reset(us); 920 mutex_lock(&us->dev_mutex); 921 922 if (result < 0) { 923 scsi_lock(us_to_host(us)); 924 usb_stor_report_device_reset(us); 925 scsi_unlock(us_to_host(us)); 926 us->transport_reset(us); 927 } 928 clear_bit(US_FLIDX_RESETTING, &us->dflags); 929 last_sector_hacks(us, srb); 930} 931 932/* Stop the current URB transfer */ 933void usb_stor_stop_transport(struct us_data *us) 934{ 935 /* 936 * If the state machine is blocked waiting for an URB, 937 * let's wake it up. The test_and_clear_bit() call 938 * guarantees that if a URB has just been submitted, 939 * it won't be cancelled more than once. 940 */ 941 if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { 942 usb_stor_dbg(us, "-- cancelling URB\n"); 943 usb_unlink_urb(us->current_urb); 944 } 945 946 /* If we are waiting for a scatter-gather operation, cancel it. */ 947 if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { 948 usb_stor_dbg(us, "-- cancelling sg request\n"); 949 usb_sg_cancel(&us->current_sg); 950 } 951} 952 953/* 954 * Control/Bulk and Control/Bulk/Interrupt transport 955 */ 956 957int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us) 958{ 959 unsigned int transfer_length = scsi_bufflen(srb); 960 unsigned int pipe = 0; 961 int result; 962 963 /* COMMAND STAGE */ 964 /* let's send the command via the control pipe */ 965 /* 966 * Command is sometime (f.e. after scsi_eh_prep_cmnd) on the stack. 967 * Stack may be vmallocated. So no DMA for us. Make a copy. 968 */ 969 memcpy(us->iobuf, srb->cmnd, srb->cmd_len); 970 result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe, 971 US_CBI_ADSC, 972 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, 973 us->ifnum, us->iobuf, srb->cmd_len); 974 975 /* check the return code for the command */ 976 usb_stor_dbg(us, "Call to usb_stor_ctrl_transfer() returned %d\n", 977 result); 978 979 /* if we stalled the command, it means command failed */ 980 if (result == USB_STOR_XFER_STALLED) { 981 return USB_STOR_TRANSPORT_FAILED; 982 } 983 984 /* Uh oh... serious problem here */ 985 if (result != USB_STOR_XFER_GOOD) { 986 return USB_STOR_TRANSPORT_ERROR; 987 } 988 989 /* DATA STAGE */ 990 /* transfer the data payload for this command, if one exists*/ 991 if (transfer_length) { 992 pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 993 us->recv_bulk_pipe : us->send_bulk_pipe; 994 result = usb_stor_bulk_srb(us, pipe, srb); 995 usb_stor_dbg(us, "CBI data stage result is 0x%x\n", result); 996 997 /* if we stalled the data transfer it means command failed */ 998 if (result == USB_STOR_XFER_STALLED) 999 return USB_STOR_TRANSPORT_FAILED; 1000 if (result > USB_STOR_XFER_STALLED) 1001 return USB_STOR_TRANSPORT_ERROR; 1002 } 1003 1004 /* STATUS STAGE */ 1005 1006 /* 1007 * NOTE: CB does not have a status stage. Silly, I know. So 1008 * we have to catch this at a higher level. 1009 */ 1010 if (us->protocol != USB_PR_CBI) 1011 return USB_STOR_TRANSPORT_GOOD; 1012 1013 result = usb_stor_intr_transfer(us, us->iobuf, 2); 1014 usb_stor_dbg(us, "Got interrupt data (0x%x, 0x%x)\n", 1015 us->iobuf[0], us->iobuf[1]); 1016 if (result != USB_STOR_XFER_GOOD) 1017 return USB_STOR_TRANSPORT_ERROR; 1018 1019 /* 1020 * UFI gives us ASC and ASCQ, like a request sense 1021 * 1022 * REQUEST_SENSE and INQUIRY don't affect the sense data on UFI 1023 * devices, so we ignore the information for those commands. Note 1024 * that this means we could be ignoring a real error on these 1025 * commands, but that can't be helped. 1026 */ 1027 if (us->subclass == USB_SC_UFI) { 1028 if (srb->cmnd[0] == REQUEST_SENSE || 1029 srb->cmnd[0] == INQUIRY) 1030 return USB_STOR_TRANSPORT_GOOD; 1031 if (us->iobuf[0]) 1032 goto Failed; 1033 return USB_STOR_TRANSPORT_GOOD; 1034 } 1035 1036 /* 1037 * If not UFI, we interpret the data as a result code 1038 * The first byte should always be a 0x0. 1039 * 1040 * Some bogus devices don't follow that rule. They stuff the ASC 1041 * into the first byte -- so if it's non-zero, call it a failure. 1042 */ 1043 if (us->iobuf[0]) { 1044 usb_stor_dbg(us, "CBI IRQ data showed reserved bType 0x%x\n", 1045 us->iobuf[0]); 1046 goto Failed; 1047 1048 } 1049 1050 /* The second byte & 0x0F should be 0x0 for good, otherwise error */ 1051 switch (us->iobuf[1] & 0x0F) { 1052 case 0x00: 1053 return USB_STOR_TRANSPORT_GOOD; 1054 case 0x01: 1055 goto Failed; 1056 } 1057 return USB_STOR_TRANSPORT_ERROR; 1058 1059 /* 1060 * the CBI spec requires that the bulk pipe must be cleared 1061 * following any data-in/out command failure (section 2.4.3.1.3) 1062 */ 1063 Failed: 1064 if (pipe) 1065 usb_stor_clear_halt(us, pipe); 1066 return USB_STOR_TRANSPORT_FAILED; 1067} 1068EXPORT_SYMBOL_GPL(usb_stor_CB_transport); 1069 1070/* 1071 * Bulk only transport 1072 */ 1073 1074/* Determine what the maximum LUN supported is */ 1075int usb_stor_Bulk_max_lun(struct us_data *us) 1076{ 1077 int result; 1078 1079 /* issue the command */ 1080 us->iobuf[0] = 0; 1081 result = usb_stor_control_msg(us, us->recv_ctrl_pipe, 1082 US_BULK_GET_MAX_LUN, 1083 USB_DIR_IN | USB_TYPE_CLASS | 1084 USB_RECIP_INTERFACE, 1085 0, us->ifnum, us->iobuf, 1, 10*HZ); 1086 1087 usb_stor_dbg(us, "GetMaxLUN command result is %d, data is %d\n", 1088 result, us->iobuf[0]); 1089 1090 /* 1091 * If we have a successful request, return the result if valid. The 1092 * CBW LUN field is 4 bits wide, so the value reported by the device 1093 * should fit into that. 1094 */ 1095 if (result > 0) { 1096 if (us->iobuf[0] < 16) { 1097 return us->iobuf[0]; 1098 } else { 1099 dev_info(&us->pusb_intf->dev, 1100 "Max LUN %d is not valid, using 0 instead", 1101 us->iobuf[0]); 1102 } 1103 } 1104 1105 /* 1106 * Some devices don't like GetMaxLUN. They may STALL the control 1107 * pipe, they may return a zero-length result, they may do nothing at 1108 * all and timeout, or they may fail in even more bizarrely creative 1109 * ways. In these cases the best approach is to use the default 1110 * value: only one LUN. 1111 */ 1112 return 0; 1113} 1114 1115int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us) 1116{ 1117 struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf; 1118 struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf; 1119 unsigned int transfer_length = scsi_bufflen(srb); 1120 unsigned int residue; 1121 int result; 1122 int fake_sense = 0; 1123 unsigned int cswlen; 1124 unsigned int cbwlen = US_BULK_CB_WRAP_LEN; 1125 1126 /* Take care of BULK32 devices; set extra byte to 0 */ 1127 if (unlikely(us->fflags & US_FL_BULK32)) { 1128 cbwlen = 32; 1129 us->iobuf[31] = 0; 1130 } 1131 1132 /* set up the command wrapper */ 1133 bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); 1134 bcb->DataTransferLength = cpu_to_le32(transfer_length); 1135 bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? 1136 US_BULK_FLAG_IN : 0; 1137 bcb->Tag = ++us->tag; 1138 bcb->Lun = srb->device->lun; 1139 if (us->fflags & US_FL_SCM_MULT_TARG) 1140 bcb->Lun |= srb->device->id << 4; 1141 bcb->Length = srb->cmd_len; 1142 1143 /* copy the command payload */ 1144 memset(bcb->CDB, 0, sizeof(bcb->CDB)); 1145 memcpy(bcb->CDB, srb->cmnd, bcb->Length); 1146 1147 /* send it to out endpoint */ 1148 usb_stor_dbg(us, "Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n", 1149 le32_to_cpu(bcb->Signature), bcb->Tag, 1150 le32_to_cpu(bcb->DataTransferLength), bcb->Flags, 1151 (bcb->Lun >> 4), (bcb->Lun & 0x0F), 1152 bcb->Length); 1153 result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, 1154 bcb, cbwlen, NULL); 1155 usb_stor_dbg(us, "Bulk command transfer result=%d\n", result); 1156 if (result != USB_STOR_XFER_GOOD) 1157 return USB_STOR_TRANSPORT_ERROR; 1158 1159 /* DATA STAGE */ 1160 /* send/receive data payload, if there is any */ 1161 1162 /* 1163 * Some USB-IDE converter chips need a 100us delay between the 1164 * command phase and the data phase. Some devices need a little 1165 * more than that, probably because of clock rate inaccuracies. 1166 */ 1167 if (unlikely(us->fflags & US_FL_GO_SLOW)) 1168 usleep_range(125, 150); 1169 1170 if (transfer_length) { 1171 unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? 1172 us->recv_bulk_pipe : us->send_bulk_pipe; 1173 result = usb_stor_bulk_srb(us, pipe, srb); 1174 usb_stor_dbg(us, "Bulk data transfer result 0x%x\n", result); 1175 if (result == USB_STOR_XFER_ERROR) 1176 return USB_STOR_TRANSPORT_ERROR; 1177 1178 /* 1179 * If the device tried to send back more data than the 1180 * amount requested, the spec requires us to transfer 1181 * the CSW anyway. Since there's no point retrying 1182 * the command, we'll return fake sense data indicating 1183 * Illegal Request, Invalid Field in CDB. 1184 */ 1185 if (result == USB_STOR_XFER_LONG) 1186 fake_sense = 1; 1187 1188 /* 1189 * Sometimes a device will mistakenly skip the data phase 1190 * and go directly to the status phase without sending a 1191 * zero-length packet. If we get a 13-byte response here, 1192 * check whether it really is a CSW. 1193 */ 1194 if (result == USB_STOR_XFER_SHORT && 1195 srb->sc_data_direction == DMA_FROM_DEVICE && 1196 transfer_length - scsi_get_resid(srb) == 1197 US_BULK_CS_WRAP_LEN) { 1198 struct scatterlist *sg = NULL; 1199 unsigned int offset = 0; 1200 1201 if (usb_stor_access_xfer_buf((unsigned char *) bcs, 1202 US_BULK_CS_WRAP_LEN, srb, &sg, 1203 &offset, FROM_XFER_BUF) == 1204 US_BULK_CS_WRAP_LEN && 1205 bcs->Signature == 1206 cpu_to_le32(US_BULK_CS_SIGN)) { 1207 usb_stor_dbg(us, "Device skipped data phase\n"); 1208 scsi_set_resid(srb, transfer_length); 1209 goto skipped_data_phase; 1210 } 1211 } 1212 } 1213 1214 /* 1215 * See flow chart on pg 15 of the Bulk Only Transport spec for 1216 * an explanation of how this code works. 1217 */ 1218 1219 /* get CSW for device status */ 1220 usb_stor_dbg(us, "Attempting to get CSW...\n"); 1221 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 1222 bcs, US_BULK_CS_WRAP_LEN, &cswlen); 1223 1224 /* 1225 * Some broken devices add unnecessary zero-length packets to the 1226 * end of their data transfers. Such packets show up as 0-length 1227 * CSWs. If we encounter such a thing, try to read the CSW again. 1228 */ 1229 if (result == USB_STOR_XFER_SHORT && cswlen == 0) { 1230 usb_stor_dbg(us, "Received 0-length CSW; retrying...\n"); 1231 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 1232 bcs, US_BULK_CS_WRAP_LEN, &cswlen); 1233 } 1234 1235 /* did the attempt to read the CSW fail? */ 1236 if (result == USB_STOR_XFER_STALLED) { 1237 1238 /* get the status again */ 1239 usb_stor_dbg(us, "Attempting to get CSW (2nd try)...\n"); 1240 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, 1241 bcs, US_BULK_CS_WRAP_LEN, NULL); 1242 } 1243 1244 /* if we still have a failure at this point, we're in trouble */ 1245 usb_stor_dbg(us, "Bulk status result = %d\n", result); 1246 if (result != USB_STOR_XFER_GOOD) 1247 return USB_STOR_TRANSPORT_ERROR; 1248 1249 skipped_data_phase: 1250 /* check bulk status */ 1251 residue = le32_to_cpu(bcs->Residue); 1252 usb_stor_dbg(us, "Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n", 1253 le32_to_cpu(bcs->Signature), bcs->Tag, 1254 residue, bcs->Status); 1255 if (!(bcs->Tag == us->tag || (us->fflags & US_FL_BULK_IGNORE_TAG)) || 1256 bcs->Status > US_BULK_STAT_PHASE) { 1257 usb_stor_dbg(us, "Bulk logical error\n"); 1258 return USB_STOR_TRANSPORT_ERROR; 1259 } 1260 1261 /* 1262 * Some broken devices report odd signatures, so we do not check them 1263 * for validity against the spec. We store the first one we see, 1264 * and check subsequent transfers for validity against this signature. 1265 */ 1266 if (!us->bcs_signature) { 1267 us->bcs_signature = bcs->Signature; 1268 if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN)) 1269 usb_stor_dbg(us, "Learnt BCS signature 0x%08X\n", 1270 le32_to_cpu(us->bcs_signature)); 1271 } else if (bcs->Signature != us->bcs_signature) { 1272 usb_stor_dbg(us, "Signature mismatch: got %08X, expecting %08X\n", 1273 le32_to_cpu(bcs->Signature), 1274 le32_to_cpu(us->bcs_signature)); 1275 return USB_STOR_TRANSPORT_ERROR; 1276 } 1277 1278 /* 1279 * try to compute the actual residue, based on how much data 1280 * was really transferred and what the device tells us 1281 */ 1282 if (residue && !(us->fflags & US_FL_IGNORE_RESIDUE)) { 1283 1284 /* 1285 * Heuristically detect devices that generate bogus residues 1286 * by seeing what happens with INQUIRY and READ CAPACITY 1287 * commands. 1288 */ 1289 if (bcs->Status == US_BULK_STAT_OK && 1290 scsi_get_resid(srb) == 0 && 1291 ((srb->cmnd[0] == INQUIRY && 1292 transfer_length == 36) || 1293 (srb->cmnd[0] == READ_CAPACITY && 1294 transfer_length == 8))) { 1295 us->fflags |= US_FL_IGNORE_RESIDUE; 1296 1297 } else { 1298 residue = min(residue, transfer_length); 1299 scsi_set_resid(srb, max(scsi_get_resid(srb), residue)); 1300 } 1301 } 1302 1303 /* based on the status code, we report good or bad */ 1304 switch (bcs->Status) { 1305 case US_BULK_STAT_OK: 1306 /* device babbled -- return fake sense data */ 1307 if (fake_sense) { 1308 memcpy(srb->sense_buffer, 1309 usb_stor_sense_invalidCDB, 1310 sizeof(usb_stor_sense_invalidCDB)); 1311 return USB_STOR_TRANSPORT_NO_SENSE; 1312 } 1313 1314 /* command good -- note that data could be short */ 1315 return USB_STOR_TRANSPORT_GOOD; 1316 1317 case US_BULK_STAT_FAIL: 1318 /* command failed */ 1319 return USB_STOR_TRANSPORT_FAILED; 1320 1321 case US_BULK_STAT_PHASE: 1322 /* 1323 * phase error -- note that a transport reset will be 1324 * invoked by the invoke_transport() function 1325 */ 1326 return USB_STOR_TRANSPORT_ERROR; 1327 } 1328 1329 /* we should never get here, but if we do, we're in trouble */ 1330 return USB_STOR_TRANSPORT_ERROR; 1331} 1332EXPORT_SYMBOL_GPL(usb_stor_Bulk_transport); 1333 1334/*********************************************************************** 1335 * Reset routines 1336 ***********************************************************************/ 1337 1338/* 1339 * This is the common part of the device reset code. 1340 * 1341 * It's handy that every transport mechanism uses the control endpoint for 1342 * resets. 1343 * 1344 * Basically, we send a reset with a 5-second timeout, so we don't get 1345 * jammed attempting to do the reset. 1346 */ 1347static int usb_stor_reset_common(struct us_data *us, 1348 u8 request, u8 requesttype, 1349 u16 value, u16 index, void *data, u16 size) 1350{ 1351 int result; 1352 int result2; 1353 1354 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { 1355 usb_stor_dbg(us, "No reset during disconnect\n"); 1356 return -EIO; 1357 } 1358 1359 result = usb_stor_control_msg(us, us->send_ctrl_pipe, 1360 request, requesttype, value, index, data, size, 1361 5*HZ); 1362 if (result < 0) { 1363 usb_stor_dbg(us, "Soft reset failed: %d\n", result); 1364 return result; 1365 } 1366 1367 /* 1368 * Give the device some time to recover from the reset, 1369 * but don't delay disconnect processing. 1370 */ 1371 wait_event_interruptible_timeout(us->delay_wait, 1372 test_bit(US_FLIDX_DISCONNECTING, &us->dflags), 1373 HZ*6); 1374 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { 1375 usb_stor_dbg(us, "Reset interrupted by disconnect\n"); 1376 return -EIO; 1377 } 1378 1379 usb_stor_dbg(us, "Soft reset: clearing bulk-in endpoint halt\n"); 1380 result = usb_stor_clear_halt(us, us->recv_bulk_pipe); 1381 1382 usb_stor_dbg(us, "Soft reset: clearing bulk-out endpoint halt\n"); 1383 result2 = usb_stor_clear_halt(us, us->send_bulk_pipe); 1384 1385 /* return a result code based on the result of the clear-halts */ 1386 if (result >= 0) 1387 result = result2; 1388 if (result < 0) 1389 usb_stor_dbg(us, "Soft reset failed\n"); 1390 else 1391 usb_stor_dbg(us, "Soft reset done\n"); 1392 return result; 1393} 1394 1395/* This issues a CB[I] Reset to the device in question */ 1396#define CB_RESET_CMD_SIZE 12 1397 1398int usb_stor_CB_reset(struct us_data *us) 1399{ 1400 memset(us->iobuf, 0xFF, CB_RESET_CMD_SIZE); 1401 us->iobuf[0] = SEND_DIAGNOSTIC; 1402 us->iobuf[1] = 4; 1403 return usb_stor_reset_common(us, US_CBI_ADSC, 1404 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 1405 0, us->ifnum, us->iobuf, CB_RESET_CMD_SIZE); 1406} 1407EXPORT_SYMBOL_GPL(usb_stor_CB_reset); 1408 1409/* 1410 * This issues a Bulk-only Reset to the device in question, including 1411 * clearing the subsequent endpoint halts that may occur. 1412 */ 1413int usb_stor_Bulk_reset(struct us_data *us) 1414{ 1415 return usb_stor_reset_common(us, US_BULK_RESET_REQUEST, 1416 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 1417 0, us->ifnum, NULL, 0); 1418} 1419EXPORT_SYMBOL_GPL(usb_stor_Bulk_reset); 1420 1421/* 1422 * Issue a USB port reset to the device. The caller must not hold 1423 * us->dev_mutex. 1424 */ 1425int usb_stor_port_reset(struct us_data *us) 1426{ 1427 int result; 1428 1429 /*for these devices we must use the class specific method */ 1430 if (us->pusb_dev->quirks & USB_QUIRK_RESET) 1431 return -EPERM; 1432 1433 result = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf); 1434 if (result < 0) 1435 usb_stor_dbg(us, "unable to lock device for reset: %d\n", 1436 result); 1437 else { 1438 /* Were we disconnected while waiting for the lock? */ 1439 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { 1440 result = -EIO; 1441 usb_stor_dbg(us, "No reset during disconnect\n"); 1442 } else { 1443 result = usb_reset_device(us->pusb_dev); 1444 usb_stor_dbg(us, "usb_reset_device returns %d\n", 1445 result); 1446 } 1447 usb_unlock_device(us->pusb_dev); 1448 } 1449 return result; 1450} 1451