include: replace linux/module.h with "struct module" wherever possible
[linux-2.6/next.git] / drivers / usb / storage / transport.c
blobacda07951de95269118aaad13e280bcc7ba79c03
1 /* Driver for USB Mass Storage compliant devices
3 * Current development and maintenance by:
4 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
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>
11 * Initial work by:
12 * (c) 1999 Michael Gee (michael@linuxspecific.com)
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.
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.
25 * Also, for certain devices, the interrupt endpoint is used to convey
26 * status of a command.
28 * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
29 * information about this driver.
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.
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.
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.
46 #include <linux/sched.h>
47 #include <linux/gfp.h>
48 #include <linux/errno.h>
49 #include <linux/export.h>
51 #include <linux/usb/quirks.h>
53 #include <scsi/scsi.h>
54 #include <scsi/scsi_eh.h>
55 #include <scsi/scsi_device.h>
57 #include "usb.h"
58 #include "transport.h"
59 #include "protocol.h"
60 #include "scsiglue.h"
61 #include "debug.h"
63 #include <linux/blkdev.h>
64 #include "../../scsi/sd.h"
67 /***********************************************************************
68 * Data transfer routines
69 ***********************************************************************/
72 * This is subtle, so pay attention:
73 * ---------------------------------
74 * We're very concerned about races with a command abort. Hanging this code
75 * is a sure fire way to hang the kernel. (Note that this discussion applies
76 * only to transactions resulting from a scsi queued-command, since only
77 * these transactions are subject to a scsi abort. Other transactions, such
78 * as those occurring during device-specific initialization, must be handled
79 * by a separate code path.)
81 * The abort function (usb_storage_command_abort() in scsiglue.c) first
82 * sets the machine state and the ABORTING bit in us->dflags to prevent
83 * new URBs from being submitted. It then calls usb_stor_stop_transport()
84 * below, which atomically tests-and-clears the URB_ACTIVE bit in us->dflags
85 * to see if the current_urb needs to be stopped. Likewise, the SG_ACTIVE
86 * bit is tested to see if the current_sg scatter-gather request needs to be
87 * stopped. The timeout callback routine does much the same thing.
89 * When a disconnect occurs, the DISCONNECTING bit in us->dflags is set to
90 * prevent new URBs from being submitted, and usb_stor_stop_transport() is
91 * called to stop any ongoing requests.
93 * The submit function first verifies that the submitting is allowed
94 * (neither ABORTING nor DISCONNECTING bits are set) and that the submit
95 * completes without errors, and only then sets the URB_ACTIVE bit. This
96 * prevents the stop_transport() function from trying to cancel the URB
97 * while the submit call is underway. Next, the submit function must test
98 * the flags to see if an abort or disconnect occurred during the submission
99 * or before the URB_ACTIVE bit was set. If so, it's essential to cancel
100 * the URB if it hasn't been cancelled already (i.e., if the URB_ACTIVE bit
101 * is still set). Either way, the function must then wait for the URB to
102 * finish. Note that the URB can still be in progress even after a call to
103 * usb_unlink_urb() returns.
105 * The idea is that (1) once the ABORTING or DISCONNECTING bit is set,
106 * either the stop_transport() function or the submitting function
107 * is guaranteed to call usb_unlink_urb() for an active URB,
108 * and (2) test_and_clear_bit() prevents usb_unlink_urb() from being
109 * called more than once or from being called during usb_submit_urb().
112 /* This is the completion handler which will wake us up when an URB
113 * completes.
115 static void usb_stor_blocking_completion(struct urb *urb)
117 struct completion *urb_done_ptr = urb->context;
119 complete(urb_done_ptr);
122 /* This is the common part of the URB message submission code
124 * All URBs from the usb-storage driver involved in handling a queued scsi
125 * command _must_ pass through this function (or something like it) for the
126 * abort mechanisms to work properly.
128 static int usb_stor_msg_common(struct us_data *us, int timeout)
130 struct completion urb_done;
131 long timeleft;
132 int status;
134 /* don't submit URBs during abort processing */
135 if (test_bit(US_FLIDX_ABORTING, &us->dflags))
136 return -EIO;
138 /* set up data structures for the wakeup system */
139 init_completion(&urb_done);
141 /* fill the common fields in the URB */
142 us->current_urb->context = &urb_done;
143 us->current_urb->transfer_flags = 0;
145 /* we assume that if transfer_buffer isn't us->iobuf then it
146 * hasn't been mapped for DMA. Yes, this is clunky, but it's
147 * easier than always having the caller tell us whether the
148 * transfer buffer has already been mapped. */
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;
153 /* submit the URB */
154 status = usb_submit_urb(us->current_urb, GFP_NOIO);
155 if (status) {
156 /* something went wrong */
157 return status;
160 /* since the URB has been submitted successfully, it's now okay
161 * to cancel it */
162 set_bit(US_FLIDX_URB_ACTIVE, &us->dflags);
164 /* did an abort occur during the submission? */
165 if (test_bit(US_FLIDX_ABORTING, &us->dflags)) {
167 /* cancel the URB, if it hasn't been cancelled already */
168 if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) {
169 US_DEBUGP("-- cancelling URB\n");
170 usb_unlink_urb(us->current_urb);
174 /* wait for the completion of the URB */
175 timeleft = wait_for_completion_interruptible_timeout(
176 &urb_done, timeout ? : MAX_SCHEDULE_TIMEOUT);
178 clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags);
180 if (timeleft <= 0) {
181 US_DEBUGP("%s -- cancelling URB\n",
182 timeleft == 0 ? "Timeout" : "Signal");
183 usb_kill_urb(us->current_urb);
186 /* return the URB status */
187 return us->current_urb->status;
191 * Transfer one control message, with timeouts, and allowing early
192 * termination. Return codes are usual -Exxx, *not* USB_STOR_XFER_xxx.
194 int usb_stor_control_msg(struct us_data *us, unsigned int pipe,
195 u8 request, u8 requesttype, u16 value, u16 index,
196 void *data, u16 size, int timeout)
198 int status;
200 US_DEBUGP("%s: rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n",
201 __func__, request, requesttype,
202 value, index, size);
204 /* fill in the devrequest structure */
205 us->cr->bRequestType = requesttype;
206 us->cr->bRequest = request;
207 us->cr->wValue = cpu_to_le16(value);
208 us->cr->wIndex = cpu_to_le16(index);
209 us->cr->wLength = cpu_to_le16(size);
211 /* fill and submit the URB */
212 usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe,
213 (unsigned char*) us->cr, data, size,
214 usb_stor_blocking_completion, NULL);
215 status = usb_stor_msg_common(us, timeout);
217 /* return the actual length of the data transferred if no error */
218 if (status == 0)
219 status = us->current_urb->actual_length;
220 return status;
222 EXPORT_SYMBOL_GPL(usb_stor_control_msg);
224 /* This is a version of usb_clear_halt() that allows early termination and
225 * doesn't read the status from the device -- this is because some devices
226 * crash their internal firmware when the status is requested after a halt.
228 * A definitive list of these 'bad' devices is too difficult to maintain or
229 * make complete enough to be useful. This problem was first observed on the
230 * Hagiwara FlashGate DUAL unit. However, bus traces reveal that neither
231 * MacOS nor Windows checks the status after clearing a halt.
233 * Since many vendors in this space limit their testing to interoperability
234 * with these two OSes, specification violations like this one are common.
236 int usb_stor_clear_halt(struct us_data *us, unsigned int pipe)
238 int result;
239 int endp = usb_pipeendpoint(pipe);
241 if (usb_pipein (pipe))
242 endp |= USB_DIR_IN;
244 result = usb_stor_control_msg(us, us->send_ctrl_pipe,
245 USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT,
246 USB_ENDPOINT_HALT, endp,
247 NULL, 0, 3*HZ);
249 if (result >= 0)
250 usb_reset_endpoint(us->pusb_dev, endp);
252 US_DEBUGP("%s: result = %d\n", __func__, result);
253 return result;
255 EXPORT_SYMBOL_GPL(usb_stor_clear_halt);
259 * Interpret the results of a URB transfer
261 * This function prints appropriate debugging messages, clears halts on
262 * non-control endpoints, and translates the status to the corresponding
263 * USB_STOR_XFER_xxx return code.
265 static int interpret_urb_result(struct us_data *us, unsigned int pipe,
266 unsigned int length, int result, unsigned int partial)
268 US_DEBUGP("Status code %d; transferred %u/%u\n",
269 result, partial, length);
270 switch (result) {
272 /* no error code; did we send all the data? */
273 case 0:
274 if (partial != length) {
275 US_DEBUGP("-- short transfer\n");
276 return USB_STOR_XFER_SHORT;
279 US_DEBUGP("-- transfer complete\n");
280 return USB_STOR_XFER_GOOD;
282 /* stalled */
283 case -EPIPE:
284 /* for control endpoints, (used by CB[I]) a stall indicates
285 * a failed command */
286 if (usb_pipecontrol(pipe)) {
287 US_DEBUGP("-- stall on control pipe\n");
288 return USB_STOR_XFER_STALLED;
291 /* for other sorts of endpoint, clear the stall */
292 US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe);
293 if (usb_stor_clear_halt(us, pipe) < 0)
294 return USB_STOR_XFER_ERROR;
295 return USB_STOR_XFER_STALLED;
297 /* babble - the device tried to send more than we wanted to read */
298 case -EOVERFLOW:
299 US_DEBUGP("-- babble\n");
300 return USB_STOR_XFER_LONG;
302 /* the transfer was cancelled by abort, disconnect, or timeout */
303 case -ECONNRESET:
304 US_DEBUGP("-- transfer cancelled\n");
305 return USB_STOR_XFER_ERROR;
307 /* short scatter-gather read transfer */
308 case -EREMOTEIO:
309 US_DEBUGP("-- short read transfer\n");
310 return USB_STOR_XFER_SHORT;
312 /* abort or disconnect in progress */
313 case -EIO:
314 US_DEBUGP("-- abort or disconnect in progress\n");
315 return USB_STOR_XFER_ERROR;
317 /* the catch-all error case */
318 default:
319 US_DEBUGP("-- unknown error\n");
320 return USB_STOR_XFER_ERROR;
325 * Transfer one control message, without timeouts, but allowing early
326 * termination. Return codes are USB_STOR_XFER_xxx.
328 int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe,
329 u8 request, u8 requesttype, u16 value, u16 index,
330 void *data, u16 size)
332 int result;
334 US_DEBUGP("%s: rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n",
335 __func__, request, requesttype,
336 value, index, size);
338 /* fill in the devrequest structure */
339 us->cr->bRequestType = requesttype;
340 us->cr->bRequest = request;
341 us->cr->wValue = cpu_to_le16(value);
342 us->cr->wIndex = cpu_to_le16(index);
343 us->cr->wLength = cpu_to_le16(size);
345 /* fill and submit the URB */
346 usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe,
347 (unsigned char*) us->cr, data, size,
348 usb_stor_blocking_completion, NULL);
349 result = usb_stor_msg_common(us, 0);
351 return interpret_urb_result(us, pipe, size, result,
352 us->current_urb->actual_length);
354 EXPORT_SYMBOL_GPL(usb_stor_ctrl_transfer);
357 * Receive one interrupt buffer, without timeouts, but allowing early
358 * termination. Return codes are USB_STOR_XFER_xxx.
360 * This routine always uses us->recv_intr_pipe as the pipe and
361 * us->ep_bInterval as the interrupt interval.
363 static int usb_stor_intr_transfer(struct us_data *us, void *buf,
364 unsigned int length)
366 int result;
367 unsigned int pipe = us->recv_intr_pipe;
368 unsigned int maxp;
370 US_DEBUGP("%s: xfer %u bytes\n", __func__, length);
372 /* calculate the max packet size */
373 maxp = usb_maxpacket(us->pusb_dev, pipe, usb_pipeout(pipe));
374 if (maxp > length)
375 maxp = length;
377 /* fill and submit the URB */
378 usb_fill_int_urb(us->current_urb, us->pusb_dev, pipe, buf,
379 maxp, usb_stor_blocking_completion, NULL,
380 us->ep_bInterval);
381 result = usb_stor_msg_common(us, 0);
383 return interpret_urb_result(us, pipe, length, result,
384 us->current_urb->actual_length);
388 * Transfer one buffer via bulk pipe, without timeouts, but allowing early
389 * termination. Return codes are USB_STOR_XFER_xxx. If the bulk pipe
390 * stalls during the transfer, the halt is automatically cleared.
392 int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe,
393 void *buf, unsigned int length, unsigned int *act_len)
395 int result;
397 US_DEBUGP("%s: xfer %u bytes\n", __func__, length);
399 /* fill and submit the URB */
400 usb_fill_bulk_urb(us->current_urb, us->pusb_dev, pipe, buf, length,
401 usb_stor_blocking_completion, NULL);
402 result = usb_stor_msg_common(us, 0);
404 /* store the actual length of the data transferred */
405 if (act_len)
406 *act_len = us->current_urb->actual_length;
407 return interpret_urb_result(us, pipe, length, result,
408 us->current_urb->actual_length);
410 EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_buf);
413 * Transfer a scatter-gather list via bulk transfer
415 * This function does basically the same thing as usb_stor_bulk_transfer_buf()
416 * above, but it uses the usbcore scatter-gather library.
418 static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe,
419 struct scatterlist *sg, int num_sg, unsigned int length,
420 unsigned int *act_len)
422 int result;
424 /* don't submit s-g requests during abort processing */
425 if (test_bit(US_FLIDX_ABORTING, &us->dflags))
426 return USB_STOR_XFER_ERROR;
428 /* initialize the scatter-gather request block */
429 US_DEBUGP("%s: xfer %u bytes, %d entries\n", __func__,
430 length, num_sg);
431 result = usb_sg_init(&us->current_sg, us->pusb_dev, pipe, 0,
432 sg, num_sg, length, GFP_NOIO);
433 if (result) {
434 US_DEBUGP("usb_sg_init returned %d\n", result);
435 return USB_STOR_XFER_ERROR;
438 /* since the block has been initialized successfully, it's now
439 * okay to cancel it */
440 set_bit(US_FLIDX_SG_ACTIVE, &us->dflags);
442 /* did an abort occur during the submission? */
443 if (test_bit(US_FLIDX_ABORTING, &us->dflags)) {
445 /* cancel the request, if it hasn't been cancelled already */
446 if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) {
447 US_DEBUGP("-- cancelling sg request\n");
448 usb_sg_cancel(&us->current_sg);
452 /* wait for the completion of the transfer */
453 usb_sg_wait(&us->current_sg);
454 clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags);
456 result = us->current_sg.status;
457 if (act_len)
458 *act_len = us->current_sg.bytes;
459 return interpret_urb_result(us, pipe, length, result,
460 us->current_sg.bytes);
464 * Common used function. Transfer a complete command
465 * via usb_stor_bulk_transfer_sglist() above. Set cmnd resid
467 int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe,
468 struct scsi_cmnd* srb)
470 unsigned int partial;
471 int result = usb_stor_bulk_transfer_sglist(us, pipe, scsi_sglist(srb),
472 scsi_sg_count(srb), scsi_bufflen(srb),
473 &partial);
475 scsi_set_resid(srb, scsi_bufflen(srb) - partial);
476 return result;
478 EXPORT_SYMBOL_GPL(usb_stor_bulk_srb);
481 * Transfer an entire SCSI command's worth of data payload over the bulk
482 * pipe.
484 * Note that this uses usb_stor_bulk_transfer_buf() and
485 * usb_stor_bulk_transfer_sglist() to achieve its goals --
486 * this function simply determines whether we're going to use
487 * scatter-gather or not, and acts appropriately.
489 int usb_stor_bulk_transfer_sg(struct us_data* us, unsigned int pipe,
490 void *buf, unsigned int length_left, int use_sg, int *residual)
492 int result;
493 unsigned int partial;
495 /* are we scatter-gathering? */
496 if (use_sg) {
497 /* use the usb core scatter-gather primitives */
498 result = usb_stor_bulk_transfer_sglist(us, pipe,
499 (struct scatterlist *) buf, use_sg,
500 length_left, &partial);
501 length_left -= partial;
502 } else {
503 /* no scatter-gather, just make the request */
504 result = usb_stor_bulk_transfer_buf(us, pipe, buf,
505 length_left, &partial);
506 length_left -= partial;
509 /* store the residual and return the error code */
510 if (residual)
511 *residual = length_left;
512 return result;
514 EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_sg);
516 /***********************************************************************
517 * Transport routines
518 ***********************************************************************/
520 /* There are so many devices that report the capacity incorrectly,
521 * this routine was written to counteract some of the resulting
522 * problems.
524 static void last_sector_hacks(struct us_data *us, struct scsi_cmnd *srb)
526 struct gendisk *disk;
527 struct scsi_disk *sdkp;
528 u32 sector;
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 */
538 /* If last-sector problems can't occur, whether because the
539 * capacity was already decremented or because the device is
540 * known to report the correct capacity, then we don't need
541 * to do anything.
543 if (!us->use_last_sector_hacks)
544 return;
546 /* Was this command a READ(10) or a WRITE(10)? */
547 if (srb->cmnd[0] != READ_10 && srb->cmnd[0] != WRITE_10)
548 goto done;
550 /* Did this command access the last sector? */
551 sector = (srb->cmnd[2] << 24) | (srb->cmnd[3] << 16) |
552 (srb->cmnd[4] << 8) | (srb->cmnd[5]);
553 disk = srb->request->rq_disk;
554 if (!disk)
555 goto done;
556 sdkp = scsi_disk(disk);
557 if (!sdkp)
558 goto done;
559 if (sector + 1 != sdkp->capacity)
560 goto done;
562 if (srb->result == SAM_STAT_GOOD && scsi_get_resid(srb) == 0) {
564 /* The command succeeded. We know this device doesn't
565 * have the last-sector bug, so stop checking it.
567 us->use_last_sector_hacks = 0;
569 } else {
570 /* The command failed. Allow up to 3 retries in case this
571 * is some normal sort of failure. After that, assume the
572 * capacity is wrong and we're trying to access the sector
573 * beyond the end. Replace the result code and sense data
574 * with values that will cause the SCSI core to fail the
575 * command immediately, instead of going into an infinite
576 * (or even just a very long) retry loop.
578 if (++us->last_sector_retries < 3)
579 return;
580 srb->result = SAM_STAT_CHECK_CONDITION;
581 memcpy(srb->sense_buffer, record_not_found,
582 sizeof(record_not_found));
585 done:
586 /* Don't reset the retry counter for TEST UNIT READY commands,
587 * because they get issued after device resets which might be
588 * caused by a failed last-sector access.
590 if (srb->cmnd[0] != TEST_UNIT_READY)
591 us->last_sector_retries = 0;
594 /* Invoke the transport and basic error-handling/recovery methods
596 * This is used by the protocol layers to actually send the message to
597 * the device and receive the response.
599 void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us)
601 int need_auto_sense;
602 int result;
604 /* send the command to the transport layer */
605 scsi_set_resid(srb, 0);
606 result = us->transport(srb, us);
608 /* if the command gets aborted by the higher layers, we need to
609 * short-circuit all other processing
611 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
612 US_DEBUGP("-- command was aborted\n");
613 srb->result = DID_ABORT << 16;
614 goto Handle_Errors;
617 /* if there is a transport error, reset and don't auto-sense */
618 if (result == USB_STOR_TRANSPORT_ERROR) {
619 US_DEBUGP("-- transport indicates error, resetting\n");
620 srb->result = DID_ERROR << 16;
621 goto Handle_Errors;
624 /* if the transport provided its own sense data, don't auto-sense */
625 if (result == USB_STOR_TRANSPORT_NO_SENSE) {
626 srb->result = SAM_STAT_CHECK_CONDITION;
627 last_sector_hacks(us, srb);
628 return;
631 srb->result = SAM_STAT_GOOD;
633 /* Determine if we need to auto-sense
635 * I normally don't use a flag like this, but it's almost impossible
636 * to understand what's going on here if I don't.
638 need_auto_sense = 0;
641 * If we're running the CB transport, which is incapable
642 * of determining status on its own, we will auto-sense
643 * unless the operation involved a data-in transfer. Devices
644 * can signal most data-in errors by stalling the bulk-in pipe.
646 if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_DPCM_USB) &&
647 srb->sc_data_direction != DMA_FROM_DEVICE) {
648 US_DEBUGP("-- CB transport device requiring auto-sense\n");
649 need_auto_sense = 1;
653 * If we have a failure, we're going to do a REQUEST_SENSE
654 * automatically. Note that we differentiate between a command
655 * "failure" and an "error" in the transport mechanism.
657 if (result == USB_STOR_TRANSPORT_FAILED) {
658 US_DEBUGP("-- transport indicates command failure\n");
659 need_auto_sense = 1;
663 * Determine if this device is SAT by seeing if the
664 * command executed successfully. Otherwise we'll have
665 * to wait for at least one CHECK_CONDITION to determine
666 * SANE_SENSE support
668 if (unlikely((srb->cmnd[0] == ATA_16 || srb->cmnd[0] == ATA_12) &&
669 result == USB_STOR_TRANSPORT_GOOD &&
670 !(us->fflags & US_FL_SANE_SENSE) &&
671 !(us->fflags & US_FL_BAD_SENSE) &&
672 !(srb->cmnd[2] & 0x20))) {
673 US_DEBUGP("-- SAT supported, increasing auto-sense\n");
674 us->fflags |= US_FL_SANE_SENSE;
678 * A short transfer on a command where we don't expect it
679 * is unusual, but it doesn't mean we need to auto-sense.
681 if ((scsi_get_resid(srb) > 0) &&
682 !((srb->cmnd[0] == REQUEST_SENSE) ||
683 (srb->cmnd[0] == INQUIRY) ||
684 (srb->cmnd[0] == MODE_SENSE) ||
685 (srb->cmnd[0] == LOG_SENSE) ||
686 (srb->cmnd[0] == MODE_SENSE_10))) {
687 US_DEBUGP("-- unexpectedly short transfer\n");
690 /* Now, if we need to do the auto-sense, let's do it */
691 if (need_auto_sense) {
692 int temp_result;
693 struct scsi_eh_save ses;
694 int sense_size = US_SENSE_SIZE;
696 /* device supports and needs bigger sense buffer */
697 if (us->fflags & US_FL_SANE_SENSE)
698 sense_size = ~0;
699 Retry_Sense:
700 US_DEBUGP("Issuing auto-REQUEST_SENSE\n");
702 scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sense_size);
704 /* FIXME: we must do the protocol translation here */
705 if (us->subclass == USB_SC_RBC || us->subclass == USB_SC_SCSI ||
706 us->subclass == USB_SC_CYP_ATACB)
707 srb->cmd_len = 6;
708 else
709 srb->cmd_len = 12;
711 /* issue the auto-sense command */
712 scsi_set_resid(srb, 0);
713 temp_result = us->transport(us->srb, us);
715 /* let's clean up right away */
716 scsi_eh_restore_cmnd(srb, &ses);
718 if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
719 US_DEBUGP("-- auto-sense aborted\n");
720 srb->result = DID_ABORT << 16;
722 /* If SANE_SENSE caused this problem, disable it */
723 if (sense_size != US_SENSE_SIZE) {
724 us->fflags &= ~US_FL_SANE_SENSE;
725 us->fflags |= US_FL_BAD_SENSE;
727 goto Handle_Errors;
730 /* Some devices claim to support larger sense but fail when
731 * trying to request it. When a transport failure happens
732 * using US_FS_SANE_SENSE, we always retry with a standard
733 * (small) sense request. This fixes some USB GSM modems
735 if (temp_result == USB_STOR_TRANSPORT_FAILED &&
736 sense_size != US_SENSE_SIZE) {
737 US_DEBUGP("-- auto-sense failure, retry small sense\n");
738 sense_size = US_SENSE_SIZE;
739 us->fflags &= ~US_FL_SANE_SENSE;
740 us->fflags |= US_FL_BAD_SENSE;
741 goto Retry_Sense;
744 /* Other failures */
745 if (temp_result != USB_STOR_TRANSPORT_GOOD) {
746 US_DEBUGP("-- auto-sense failure\n");
748 /* we skip the reset if this happens to be a
749 * multi-target device, since failure of an
750 * auto-sense is perfectly valid
752 srb->result = DID_ERROR << 16;
753 if (!(us->fflags & US_FL_SCM_MULT_TARG))
754 goto Handle_Errors;
755 return;
758 /* If the sense data returned is larger than 18-bytes then we
759 * assume this device supports requesting more in the future.
760 * The response code must be 70h through 73h inclusive.
762 if (srb->sense_buffer[7] > (US_SENSE_SIZE - 8) &&
763 !(us->fflags & US_FL_SANE_SENSE) &&
764 !(us->fflags & US_FL_BAD_SENSE) &&
765 (srb->sense_buffer[0] & 0x7C) == 0x70) {
766 US_DEBUGP("-- SANE_SENSE support enabled\n");
767 us->fflags |= US_FL_SANE_SENSE;
769 /* Indicate to the user that we truncated their sense
770 * because we didn't know it supported larger sense.
772 US_DEBUGP("-- Sense data truncated to %i from %i\n",
773 US_SENSE_SIZE,
774 srb->sense_buffer[7] + 8);
775 srb->sense_buffer[7] = (US_SENSE_SIZE - 8);
778 US_DEBUGP("-- Result from auto-sense is %d\n", temp_result);
779 US_DEBUGP("-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n",
780 srb->sense_buffer[0],
781 srb->sense_buffer[2] & 0xf,
782 srb->sense_buffer[12],
783 srb->sense_buffer[13]);
784 #ifdef CONFIG_USB_STORAGE_DEBUG
785 usb_stor_show_sense(
786 srb->sense_buffer[2] & 0xf,
787 srb->sense_buffer[12],
788 srb->sense_buffer[13]);
789 #endif
791 /* set the result so the higher layers expect this data */
792 srb->result = SAM_STAT_CHECK_CONDITION;
794 /* We often get empty sense data. This could indicate that
795 * everything worked or that there was an unspecified
796 * problem. We have to decide which.
798 if ( /* Filemark 0, ignore EOM, ILI 0, no sense */
799 (srb->sense_buffer[2] & 0xaf) == 0 &&
800 /* No ASC or ASCQ */
801 srb->sense_buffer[12] == 0 &&
802 srb->sense_buffer[13] == 0) {
804 /* If things are really okay, then let's show that.
805 * Zero out the sense buffer so the higher layers
806 * won't realize we did an unsolicited auto-sense.
808 if (result == USB_STOR_TRANSPORT_GOOD) {
809 srb->result = SAM_STAT_GOOD;
810 srb->sense_buffer[0] = 0x0;
812 /* If there was a problem, report an unspecified
813 * hardware error to prevent the higher layers from
814 * entering an infinite retry loop.
816 } else {
817 srb->result = DID_ERROR << 16;
818 srb->sense_buffer[2] = HARDWARE_ERROR;
824 * Some devices don't work or return incorrect data the first
825 * time they get a READ(10) command, or for the first READ(10)
826 * after a media change. If the INITIAL_READ10 flag is set,
827 * keep track of whether READ(10) commands succeed. If the
828 * previous one succeeded and this one failed, set the REDO_READ10
829 * flag to force a retry.
831 if (unlikely((us->fflags & US_FL_INITIAL_READ10) &&
832 srb->cmnd[0] == READ_10)) {
833 if (srb->result == SAM_STAT_GOOD) {
834 set_bit(US_FLIDX_READ10_WORKED, &us->dflags);
835 } else if (test_bit(US_FLIDX_READ10_WORKED, &us->dflags)) {
836 clear_bit(US_FLIDX_READ10_WORKED, &us->dflags);
837 set_bit(US_FLIDX_REDO_READ10, &us->dflags);
841 * Next, if the REDO_READ10 flag is set, return a result
842 * code that will cause the SCSI core to retry the READ(10)
843 * command immediately.
845 if (test_bit(US_FLIDX_REDO_READ10, &us->dflags)) {
846 clear_bit(US_FLIDX_REDO_READ10, &us->dflags);
847 srb->result = DID_IMM_RETRY << 16;
848 srb->sense_buffer[0] = 0;
852 /* Did we transfer less than the minimum amount required? */
853 if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) &&
854 scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow)
855 srb->result = DID_ERROR << 16;
857 last_sector_hacks(us, srb);
858 return;
860 /* Error and abort processing: try to resynchronize with the device
861 * by issuing a port reset. If that fails, try a class-specific
862 * device reset. */
863 Handle_Errors:
865 /* Set the RESETTING bit, and clear the ABORTING bit so that
866 * the reset may proceed. */
867 scsi_lock(us_to_host(us));
868 set_bit(US_FLIDX_RESETTING, &us->dflags);
869 clear_bit(US_FLIDX_ABORTING, &us->dflags);
870 scsi_unlock(us_to_host(us));
872 /* We must release the device lock because the pre_reset routine
873 * will want to acquire it. */
874 mutex_unlock(&us->dev_mutex);
875 result = usb_stor_port_reset(us);
876 mutex_lock(&us->dev_mutex);
878 if (result < 0) {
879 scsi_lock(us_to_host(us));
880 usb_stor_report_device_reset(us);
881 scsi_unlock(us_to_host(us));
882 us->transport_reset(us);
884 clear_bit(US_FLIDX_RESETTING, &us->dflags);
885 last_sector_hacks(us, srb);
888 /* Stop the current URB transfer */
889 void usb_stor_stop_transport(struct us_data *us)
891 US_DEBUGP("%s called\n", __func__);
893 /* If the state machine is blocked waiting for an URB,
894 * let's wake it up. The test_and_clear_bit() call
895 * guarantees that if a URB has just been submitted,
896 * it won't be cancelled more than once. */
897 if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) {
898 US_DEBUGP("-- cancelling URB\n");
899 usb_unlink_urb(us->current_urb);
902 /* If we are waiting for a scatter-gather operation, cancel it. */
903 if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) {
904 US_DEBUGP("-- cancelling sg request\n");
905 usb_sg_cancel(&us->current_sg);
910 * Control/Bulk and Control/Bulk/Interrupt transport
913 int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us)
915 unsigned int transfer_length = scsi_bufflen(srb);
916 unsigned int pipe = 0;
917 int result;
919 /* COMMAND STAGE */
920 /* let's send the command via the control pipe */
921 result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
922 US_CBI_ADSC,
923 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
924 us->ifnum, srb->cmnd, srb->cmd_len);
926 /* check the return code for the command */
927 US_DEBUGP("Call to usb_stor_ctrl_transfer() returned %d\n", result);
929 /* if we stalled the command, it means command failed */
930 if (result == USB_STOR_XFER_STALLED) {
931 return USB_STOR_TRANSPORT_FAILED;
934 /* Uh oh... serious problem here */
935 if (result != USB_STOR_XFER_GOOD) {
936 return USB_STOR_TRANSPORT_ERROR;
939 /* DATA STAGE */
940 /* transfer the data payload for this command, if one exists*/
941 if (transfer_length) {
942 pipe = srb->sc_data_direction == DMA_FROM_DEVICE ?
943 us->recv_bulk_pipe : us->send_bulk_pipe;
944 result = usb_stor_bulk_srb(us, pipe, srb);
945 US_DEBUGP("CBI data stage result is 0x%x\n", result);
947 /* if we stalled the data transfer it means command failed */
948 if (result == USB_STOR_XFER_STALLED)
949 return USB_STOR_TRANSPORT_FAILED;
950 if (result > USB_STOR_XFER_STALLED)
951 return USB_STOR_TRANSPORT_ERROR;
954 /* STATUS STAGE */
956 /* NOTE: CB does not have a status stage. Silly, I know. So
957 * we have to catch this at a higher level.
959 if (us->protocol != USB_PR_CBI)
960 return USB_STOR_TRANSPORT_GOOD;
962 result = usb_stor_intr_transfer(us, us->iobuf, 2);
963 US_DEBUGP("Got interrupt data (0x%x, 0x%x)\n",
964 us->iobuf[0], us->iobuf[1]);
965 if (result != USB_STOR_XFER_GOOD)
966 return USB_STOR_TRANSPORT_ERROR;
968 /* UFI gives us ASC and ASCQ, like a request sense
970 * REQUEST_SENSE and INQUIRY don't affect the sense data on UFI
971 * devices, so we ignore the information for those commands. Note
972 * that this means we could be ignoring a real error on these
973 * commands, but that can't be helped.
975 if (us->subclass == USB_SC_UFI) {
976 if (srb->cmnd[0] == REQUEST_SENSE ||
977 srb->cmnd[0] == INQUIRY)
978 return USB_STOR_TRANSPORT_GOOD;
979 if (us->iobuf[0])
980 goto Failed;
981 return USB_STOR_TRANSPORT_GOOD;
984 /* If not UFI, we interpret the data as a result code
985 * The first byte should always be a 0x0.
987 * Some bogus devices don't follow that rule. They stuff the ASC
988 * into the first byte -- so if it's non-zero, call it a failure.
990 if (us->iobuf[0]) {
991 US_DEBUGP("CBI IRQ data showed reserved bType 0x%x\n",
992 us->iobuf[0]);
993 goto Failed;
997 /* The second byte & 0x0F should be 0x0 for good, otherwise error */
998 switch (us->iobuf[1] & 0x0F) {
999 case 0x00:
1000 return USB_STOR_TRANSPORT_GOOD;
1001 case 0x01:
1002 goto Failed;
1004 return USB_STOR_TRANSPORT_ERROR;
1006 /* the CBI spec requires that the bulk pipe must be cleared
1007 * following any data-in/out command failure (section 2.4.3.1.3)
1009 Failed:
1010 if (pipe)
1011 usb_stor_clear_halt(us, pipe);
1012 return USB_STOR_TRANSPORT_FAILED;
1014 EXPORT_SYMBOL_GPL(usb_stor_CB_transport);
1017 * Bulk only transport
1020 /* Determine what the maximum LUN supported is */
1021 int usb_stor_Bulk_max_lun(struct us_data *us)
1023 int result;
1025 /* issue the command */
1026 us->iobuf[0] = 0;
1027 result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
1028 US_BULK_GET_MAX_LUN,
1029 USB_DIR_IN | USB_TYPE_CLASS |
1030 USB_RECIP_INTERFACE,
1031 0, us->ifnum, us->iobuf, 1, 10*HZ);
1033 US_DEBUGP("GetMaxLUN command result is %d, data is %d\n",
1034 result, us->iobuf[0]);
1036 /* if we have a successful request, return the result */
1037 if (result > 0)
1038 return us->iobuf[0];
1041 * Some devices don't like GetMaxLUN. They may STALL the control
1042 * pipe, they may return a zero-length result, they may do nothing at
1043 * all and timeout, or they may fail in even more bizarrely creative
1044 * ways. In these cases the best approach is to use the default
1045 * value: only one LUN.
1047 return 0;
1050 int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us)
1052 struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf;
1053 struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf;
1054 unsigned int transfer_length = scsi_bufflen(srb);
1055 unsigned int residue;
1056 int result;
1057 int fake_sense = 0;
1058 unsigned int cswlen;
1059 unsigned int cbwlen = US_BULK_CB_WRAP_LEN;
1061 /* Take care of BULK32 devices; set extra byte to 0 */
1062 if (unlikely(us->fflags & US_FL_BULK32)) {
1063 cbwlen = 32;
1064 us->iobuf[31] = 0;
1067 /* set up the command wrapper */
1068 bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN);
1069 bcb->DataTransferLength = cpu_to_le32(transfer_length);
1070 bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? 1 << 7 : 0;
1071 bcb->Tag = ++us->tag;
1072 bcb->Lun = srb->device->lun;
1073 if (us->fflags & US_FL_SCM_MULT_TARG)
1074 bcb->Lun |= srb->device->id << 4;
1075 bcb->Length = srb->cmd_len;
1077 /* copy the command payload */
1078 memset(bcb->CDB, 0, sizeof(bcb->CDB));
1079 memcpy(bcb->CDB, srb->cmnd, bcb->Length);
1081 /* send it to out endpoint */
1082 US_DEBUGP("Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n",
1083 le32_to_cpu(bcb->Signature), bcb->Tag,
1084 le32_to_cpu(bcb->DataTransferLength), bcb->Flags,
1085 (bcb->Lun >> 4), (bcb->Lun & 0x0F),
1086 bcb->Length);
1087 result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
1088 bcb, cbwlen, NULL);
1089 US_DEBUGP("Bulk command transfer result=%d\n", result);
1090 if (result != USB_STOR_XFER_GOOD)
1091 return USB_STOR_TRANSPORT_ERROR;
1093 /* DATA STAGE */
1094 /* send/receive data payload, if there is any */
1096 /* Some USB-IDE converter chips need a 100us delay between the
1097 * command phase and the data phase. Some devices need a little
1098 * more than that, probably because of clock rate inaccuracies. */
1099 if (unlikely(us->fflags & US_FL_GO_SLOW))
1100 udelay(125);
1102 if (transfer_length) {
1103 unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ?
1104 us->recv_bulk_pipe : us->send_bulk_pipe;
1105 result = usb_stor_bulk_srb(us, pipe, srb);
1106 US_DEBUGP("Bulk data transfer result 0x%x\n", result);
1107 if (result == USB_STOR_XFER_ERROR)
1108 return USB_STOR_TRANSPORT_ERROR;
1110 /* If the device tried to send back more data than the
1111 * amount requested, the spec requires us to transfer
1112 * the CSW anyway. Since there's no point retrying the
1113 * the command, we'll return fake sense data indicating
1114 * Illegal Request, Invalid Field in CDB.
1116 if (result == USB_STOR_XFER_LONG)
1117 fake_sense = 1;
1120 /* See flow chart on pg 15 of the Bulk Only Transport spec for
1121 * an explanation of how this code works.
1124 /* get CSW for device status */
1125 US_DEBUGP("Attempting to get CSW...\n");
1126 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
1127 bcs, US_BULK_CS_WRAP_LEN, &cswlen);
1129 /* Some broken devices add unnecessary zero-length packets to the
1130 * end of their data transfers. Such packets show up as 0-length
1131 * CSWs. If we encounter such a thing, try to read the CSW again.
1133 if (result == USB_STOR_XFER_SHORT && cswlen == 0) {
1134 US_DEBUGP("Received 0-length CSW; retrying...\n");
1135 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
1136 bcs, US_BULK_CS_WRAP_LEN, &cswlen);
1139 /* did the attempt to read the CSW fail? */
1140 if (result == USB_STOR_XFER_STALLED) {
1142 /* get the status again */
1143 US_DEBUGP("Attempting to get CSW (2nd try)...\n");
1144 result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
1145 bcs, US_BULK_CS_WRAP_LEN, NULL);
1148 /* if we still have a failure at this point, we're in trouble */
1149 US_DEBUGP("Bulk status result = %d\n", result);
1150 if (result != USB_STOR_XFER_GOOD)
1151 return USB_STOR_TRANSPORT_ERROR;
1153 /* check bulk status */
1154 residue = le32_to_cpu(bcs->Residue);
1155 US_DEBUGP("Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n",
1156 le32_to_cpu(bcs->Signature), bcs->Tag,
1157 residue, bcs->Status);
1158 if (!(bcs->Tag == us->tag || (us->fflags & US_FL_BULK_IGNORE_TAG)) ||
1159 bcs->Status > US_BULK_STAT_PHASE) {
1160 US_DEBUGP("Bulk logical error\n");
1161 return USB_STOR_TRANSPORT_ERROR;
1164 /* Some broken devices report odd signatures, so we do not check them
1165 * for validity against the spec. We store the first one we see,
1166 * and check subsequent transfers for validity against this signature.
1168 if (!us->bcs_signature) {
1169 us->bcs_signature = bcs->Signature;
1170 if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN))
1171 US_DEBUGP("Learnt BCS signature 0x%08X\n",
1172 le32_to_cpu(us->bcs_signature));
1173 } else if (bcs->Signature != us->bcs_signature) {
1174 US_DEBUGP("Signature mismatch: got %08X, expecting %08X\n",
1175 le32_to_cpu(bcs->Signature),
1176 le32_to_cpu(us->bcs_signature));
1177 return USB_STOR_TRANSPORT_ERROR;
1180 /* try to compute the actual residue, based on how much data
1181 * was really transferred and what the device tells us */
1182 if (residue && !(us->fflags & US_FL_IGNORE_RESIDUE)) {
1184 /* Heuristically detect devices that generate bogus residues
1185 * by seeing what happens with INQUIRY and READ CAPACITY
1186 * commands.
1188 if (bcs->Status == US_BULK_STAT_OK &&
1189 scsi_get_resid(srb) == 0 &&
1190 ((srb->cmnd[0] == INQUIRY &&
1191 transfer_length == 36) ||
1192 (srb->cmnd[0] == READ_CAPACITY &&
1193 transfer_length == 8))) {
1194 us->fflags |= US_FL_IGNORE_RESIDUE;
1196 } else {
1197 residue = min(residue, transfer_length);
1198 scsi_set_resid(srb, max(scsi_get_resid(srb),
1199 (int) residue));
1203 /* based on the status code, we report good or bad */
1204 switch (bcs->Status) {
1205 case US_BULK_STAT_OK:
1206 /* device babbled -- return fake sense data */
1207 if (fake_sense) {
1208 memcpy(srb->sense_buffer,
1209 usb_stor_sense_invalidCDB,
1210 sizeof(usb_stor_sense_invalidCDB));
1211 return USB_STOR_TRANSPORT_NO_SENSE;
1214 /* command good -- note that data could be short */
1215 return USB_STOR_TRANSPORT_GOOD;
1217 case US_BULK_STAT_FAIL:
1218 /* command failed */
1219 return USB_STOR_TRANSPORT_FAILED;
1221 case US_BULK_STAT_PHASE:
1222 /* phase error -- note that a transport reset will be
1223 * invoked by the invoke_transport() function
1225 return USB_STOR_TRANSPORT_ERROR;
1228 /* we should never get here, but if we do, we're in trouble */
1229 return USB_STOR_TRANSPORT_ERROR;
1231 EXPORT_SYMBOL_GPL(usb_stor_Bulk_transport);
1233 /***********************************************************************
1234 * Reset routines
1235 ***********************************************************************/
1237 /* This is the common part of the device reset code.
1239 * It's handy that every transport mechanism uses the control endpoint for
1240 * resets.
1242 * Basically, we send a reset with a 5-second timeout, so we don't get
1243 * jammed attempting to do the reset.
1245 static int usb_stor_reset_common(struct us_data *us,
1246 u8 request, u8 requesttype,
1247 u16 value, u16 index, void *data, u16 size)
1249 int result;
1250 int result2;
1252 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
1253 US_DEBUGP("No reset during disconnect\n");
1254 return -EIO;
1257 result = usb_stor_control_msg(us, us->send_ctrl_pipe,
1258 request, requesttype, value, index, data, size,
1259 5*HZ);
1260 if (result < 0) {
1261 US_DEBUGP("Soft reset failed: %d\n", result);
1262 return result;
1265 /* Give the device some time to recover from the reset,
1266 * but don't delay disconnect processing. */
1267 wait_event_interruptible_timeout(us->delay_wait,
1268 test_bit(US_FLIDX_DISCONNECTING, &us->dflags),
1269 HZ*6);
1270 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
1271 US_DEBUGP("Reset interrupted by disconnect\n");
1272 return -EIO;
1275 US_DEBUGP("Soft reset: clearing bulk-in endpoint halt\n");
1276 result = usb_stor_clear_halt(us, us->recv_bulk_pipe);
1278 US_DEBUGP("Soft reset: clearing bulk-out endpoint halt\n");
1279 result2 = usb_stor_clear_halt(us, us->send_bulk_pipe);
1281 /* return a result code based on the result of the clear-halts */
1282 if (result >= 0)
1283 result = result2;
1284 if (result < 0)
1285 US_DEBUGP("Soft reset failed\n");
1286 else
1287 US_DEBUGP("Soft reset done\n");
1288 return result;
1291 /* This issues a CB[I] Reset to the device in question
1293 #define CB_RESET_CMD_SIZE 12
1295 int usb_stor_CB_reset(struct us_data *us)
1297 US_DEBUGP("%s called\n", __func__);
1299 memset(us->iobuf, 0xFF, CB_RESET_CMD_SIZE);
1300 us->iobuf[0] = SEND_DIAGNOSTIC;
1301 us->iobuf[1] = 4;
1302 return usb_stor_reset_common(us, US_CBI_ADSC,
1303 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
1304 0, us->ifnum, us->iobuf, CB_RESET_CMD_SIZE);
1306 EXPORT_SYMBOL_GPL(usb_stor_CB_reset);
1308 /* This issues a Bulk-only Reset to the device in question, including
1309 * clearing the subsequent endpoint halts that may occur.
1311 int usb_stor_Bulk_reset(struct us_data *us)
1313 US_DEBUGP("%s called\n", __func__);
1315 return usb_stor_reset_common(us, US_BULK_RESET_REQUEST,
1316 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
1317 0, us->ifnum, NULL, 0);
1319 EXPORT_SYMBOL_GPL(usb_stor_Bulk_reset);
1321 /* Issue a USB port reset to the device. The caller must not hold
1322 * us->dev_mutex.
1324 int usb_stor_port_reset(struct us_data *us)
1326 int result;
1328 /*for these devices we must use the class specific method */
1329 if (us->pusb_dev->quirks & USB_QUIRK_RESET_MORPHS)
1330 return -EPERM;
1332 result = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf);
1333 if (result < 0)
1334 US_DEBUGP("unable to lock device for reset: %d\n", result);
1335 else {
1336 /* Were we disconnected while waiting for the lock? */
1337 if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) {
1338 result = -EIO;
1339 US_DEBUGP("No reset during disconnect\n");
1340 } else {
1341 result = usb_reset_device(us->pusb_dev);
1342 US_DEBUGP("usb_reset_device returns %d\n",
1343 result);
1345 usb_unlock_device(us->pusb_dev);
1347 return result;