1 // SPDX-License-Identifier: GPL-2.0+
3 * Driver for USB Mass Storage compliant devices
5 * Current development and maintenance by:
6 * (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
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>
14 * (c) 1999 Michael Gee (michael@linuxspecific.com)
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.
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.
27 * Also, for certain devices, the interrupt endpoint is used to convey
28 * status of a command.
31 #include <linux/sched.h>
32 #include <linux/gfp.h>
33 #include <linux/errno.h>
34 #include <linux/export.h>
36 #include <linux/usb/quirks.h>
38 #include <scsi/scsi.h>
39 #include <scsi/scsi_eh.h>
40 #include <scsi/scsi_device.h>
43 #include "transport.h"
48 #include <linux/blkdev.h>
49 #include "../../scsi/sd.h"
52 /***********************************************************************
53 * Data transfer routines
54 ***********************************************************************/
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.)
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.
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.
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.
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().
98 * This is the completion handler which will wake us up when an URB
101 static void usb_stor_blocking_completion(struct urb
*urb
)
103 struct completion
*urb_done_ptr
= urb
->context
;
105 complete(urb_done_ptr
);
109 * This is the common part of the URB message submission code
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.
115 static int usb_stor_msg_common(struct us_data
*us
, int timeout
)
117 struct completion urb_done
;
121 /* don't submit URBs during abort processing */
122 if (test_bit(US_FLIDX_ABORTING
, &us
->dflags
))
125 /* set up data structures for the wakeup system */
126 init_completion(&urb_done
);
128 /* fill the common fields in the URB */
129 us
->current_urb
->context
= &urb_done
;
130 us
->current_urb
->transfer_flags
= 0;
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.
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
;
143 status
= usb_submit_urb(us
->current_urb
, GFP_NOIO
);
145 /* something went wrong */
150 * since the URB has been submitted successfully, it's now okay
153 set_bit(US_FLIDX_URB_ACTIVE
, &us
->dflags
);
155 /* did an abort occur during the submission? */
156 if (test_bit(US_FLIDX_ABORTING
, &us
->dflags
)) {
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
);
165 /* wait for the completion of the URB */
166 timeleft
= wait_for_completion_interruptible_timeout(
167 &urb_done
, timeout
? : MAX_SCHEDULE_TIMEOUT
);
169 clear_bit(US_FLIDX_URB_ACTIVE
, &us
->dflags
);
172 usb_stor_dbg(us
, "%s -- cancelling URB\n",
173 timeleft
== 0 ? "Timeout" : "Signal");
174 usb_kill_urb(us
->current_urb
);
177 /* return the URB status */
178 return us
->current_urb
->status
;
182 * Transfer one control message, with timeouts, and allowing early
183 * termination. Return codes are usual -Exxx, *not* USB_STOR_XFER_xxx.
185 int 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
)
191 usb_stor_dbg(us
, "rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n",
192 request
, requesttype
, value
, index
, size
);
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
);
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
);
207 /* return the actual length of the data transferred if no error */
209 status
= us
->current_urb
->actual_length
;
212 EXPORT_SYMBOL_GPL(usb_stor_control_msg
);
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.
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.
224 * Since many vendors in this space limit their testing to interoperability
225 * with these two OSes, specification violations like this one are common.
227 int usb_stor_clear_halt(struct us_data
*us
, unsigned int pipe
)
230 int endp
= usb_pipeendpoint(pipe
);
232 if (usb_pipein (pipe
))
235 result
= usb_stor_control_msg(us
, us
->send_ctrl_pipe
,
236 USB_REQ_CLEAR_FEATURE
, USB_RECIP_ENDPOINT
,
237 USB_ENDPOINT_HALT
, endp
,
241 usb_reset_endpoint(us
->pusb_dev
, endp
);
243 usb_stor_dbg(us
, "result = %d\n", result
);
246 EXPORT_SYMBOL_GPL(usb_stor_clear_halt
);
250 * Interpret the results of a URB transfer
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.
256 static int interpret_urb_result(struct us_data
*us
, unsigned int pipe
,
257 unsigned int length
, int result
, unsigned int partial
)
259 usb_stor_dbg(us
, "Status code %d; transferred %u/%u\n",
260 result
, partial
, length
);
263 /* no error code; did we send all the data? */
265 if (partial
!= length
) {
266 usb_stor_dbg(us
, "-- short transfer\n");
267 return USB_STOR_XFER_SHORT
;
270 usb_stor_dbg(us
, "-- transfer complete\n");
271 return USB_STOR_XFER_GOOD
;
276 * for control endpoints, (used by CB[I]) a stall indicates
279 if (usb_pipecontrol(pipe
)) {
280 usb_stor_dbg(us
, "-- stall on control pipe\n");
281 return USB_STOR_XFER_STALLED
;
284 /* for other sorts of endpoint, clear the stall */
285 usb_stor_dbg(us
, "clearing endpoint halt for pipe 0x%x\n",
287 if (usb_stor_clear_halt(us
, pipe
) < 0)
288 return USB_STOR_XFER_ERROR
;
289 return USB_STOR_XFER_STALLED
;
291 /* babble - the device tried to send more than we wanted to read */
293 usb_stor_dbg(us
, "-- babble\n");
294 return USB_STOR_XFER_LONG
;
296 /* the transfer was cancelled by abort, disconnect, or timeout */
298 usb_stor_dbg(us
, "-- transfer cancelled\n");
299 return USB_STOR_XFER_ERROR
;
301 /* short scatter-gather read transfer */
303 usb_stor_dbg(us
, "-- short read transfer\n");
304 return USB_STOR_XFER_SHORT
;
306 /* abort or disconnect in progress */
308 usb_stor_dbg(us
, "-- abort or disconnect in progress\n");
309 return USB_STOR_XFER_ERROR
;
311 /* the catch-all error case */
313 usb_stor_dbg(us
, "-- unknown error\n");
314 return USB_STOR_XFER_ERROR
;
319 * Transfer one control message, without timeouts, but allowing early
320 * termination. Return codes are USB_STOR_XFER_xxx.
322 int 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
)
328 usb_stor_dbg(us
, "rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n",
329 request
, requesttype
, value
, index
, size
);
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
);
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);
344 return interpret_urb_result(us
, pipe
, size
, result
,
345 us
->current_urb
->actual_length
);
347 EXPORT_SYMBOL_GPL(usb_stor_ctrl_transfer
);
350 * Receive one interrupt buffer, without timeouts, but allowing early
351 * termination. Return codes are USB_STOR_XFER_xxx.
353 * This routine always uses us->recv_intr_pipe as the pipe and
354 * us->ep_bInterval as the interrupt interval.
356 static int usb_stor_intr_transfer(struct us_data
*us
, void *buf
,
360 unsigned int pipe
= us
->recv_intr_pipe
;
363 usb_stor_dbg(us
, "xfer %u bytes\n", length
);
365 /* calculate the max packet size */
366 maxp
= usb_maxpacket(us
->pusb_dev
, pipe
, usb_pipeout(pipe
));
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
,
374 result
= usb_stor_msg_common(us
, 0);
376 return interpret_urb_result(us
, pipe
, length
, result
,
377 us
->current_urb
->actual_length
);
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.
385 int usb_stor_bulk_transfer_buf(struct us_data
*us
, unsigned int pipe
,
386 void *buf
, unsigned int length
, unsigned int *act_len
)
390 usb_stor_dbg(us
, "xfer %u bytes\n", length
);
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);
397 /* store the actual length of the data transferred */
399 *act_len
= us
->current_urb
->actual_length
;
400 return interpret_urb_result(us
, pipe
, length
, result
,
401 us
->current_urb
->actual_length
);
403 EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_buf
);
406 * Transfer a scatter-gather list via bulk transfer
408 * This function does basically the same thing as usb_stor_bulk_transfer_buf()
409 * above, but it uses the usbcore scatter-gather library.
411 static 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
)
417 /* don't submit s-g requests during abort processing */
418 if (test_bit(US_FLIDX_ABORTING
, &us
->dflags
))
419 return USB_STOR_XFER_ERROR
;
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
);
426 usb_stor_dbg(us
, "usb_sg_init returned %d\n", result
);
427 return USB_STOR_XFER_ERROR
;
431 * since the block has been initialized successfully, it's now
434 set_bit(US_FLIDX_SG_ACTIVE
, &us
->dflags
);
436 /* did an abort occur during the submission? */
437 if (test_bit(US_FLIDX_ABORTING
, &us
->dflags
)) {
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
);
446 /* wait for the completion of the transfer */
447 usb_sg_wait(&us
->current_sg
);
448 clear_bit(US_FLIDX_SG_ACTIVE
, &us
->dflags
);
450 result
= us
->current_sg
.status
;
452 *act_len
= us
->current_sg
.bytes
;
453 return interpret_urb_result(us
, pipe
, length
, result
,
454 us
->current_sg
.bytes
);
458 * Common used function. Transfer a complete command
459 * via usb_stor_bulk_transfer_sglist() above. Set cmnd resid
461 int usb_stor_bulk_srb(struct us_data
* us
, unsigned int pipe
,
462 struct scsi_cmnd
* srb
)
464 unsigned int partial
;
465 int result
= usb_stor_bulk_transfer_sglist(us
, pipe
, scsi_sglist(srb
),
466 scsi_sg_count(srb
), scsi_bufflen(srb
),
469 scsi_set_resid(srb
, scsi_bufflen(srb
) - partial
);
472 EXPORT_SYMBOL_GPL(usb_stor_bulk_srb
);
475 * Transfer an entire SCSI command's worth of data payload over the bulk
478 * Note that this uses usb_stor_bulk_transfer_buf() and
479 * usb_stor_bulk_transfer_sglist() to achieve its goals --
480 * this function simply determines whether we're going to use
481 * scatter-gather or not, and acts appropriately.
483 int usb_stor_bulk_transfer_sg(struct us_data
* us
, unsigned int pipe
,
484 void *buf
, unsigned int length_left
, int use_sg
, int *residual
)
487 unsigned int partial
;
489 /* are we scatter-gathering? */
491 /* use the usb core scatter-gather primitives */
492 result
= usb_stor_bulk_transfer_sglist(us
, pipe
,
493 (struct scatterlist
*) buf
, use_sg
,
494 length_left
, &partial
);
495 length_left
-= partial
;
497 /* no scatter-gather, just make the request */
498 result
= usb_stor_bulk_transfer_buf(us
, pipe
, buf
,
499 length_left
, &partial
);
500 length_left
-= partial
;
503 /* store the residual and return the error code */
505 *residual
= length_left
;
508 EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_sg
);
510 /***********************************************************************
512 ***********************************************************************/
515 * There are so many devices that report the capacity incorrectly,
516 * this routine was written to counteract some of the resulting
519 static void last_sector_hacks(struct us_data
*us
, struct scsi_cmnd
*srb
)
521 struct gendisk
*disk
;
522 struct scsi_disk
*sdkp
;
525 /* To Report "Medium Error: Record Not Found */
526 static unsigned char record_not_found
[18] = {
527 [0] = 0x70, /* current error */
528 [2] = MEDIUM_ERROR
, /* = 0x03 */
529 [7] = 0x0a, /* additional length */
530 [12] = 0x14 /* Record Not Found */
534 * If last-sector problems can't occur, whether because the
535 * capacity was already decremented or because the device is
536 * known to report the correct capacity, then we don't need
539 if (!us
->use_last_sector_hacks
)
542 /* Was this command a READ(10) or a WRITE(10)? */
543 if (srb
->cmnd
[0] != READ_10
&& srb
->cmnd
[0] != WRITE_10
)
546 /* Did this command access the last sector? */
547 sector
= (srb
->cmnd
[2] << 24) | (srb
->cmnd
[3] << 16) |
548 (srb
->cmnd
[4] << 8) | (srb
->cmnd
[5]);
549 disk
= srb
->request
->rq_disk
;
552 sdkp
= scsi_disk(disk
);
555 if (sector
+ 1 != sdkp
->capacity
)
558 if (srb
->result
== SAM_STAT_GOOD
&& scsi_get_resid(srb
) == 0) {
561 * The command succeeded. We know this device doesn't
562 * have the last-sector bug, so stop checking it.
564 us
->use_last_sector_hacks
= 0;
568 * The command failed. Allow up to 3 retries in case this
569 * is some normal sort of failure. After that, assume the
570 * capacity is wrong and we're trying to access the sector
571 * beyond the end. Replace the result code and sense data
572 * with values that will cause the SCSI core to fail the
573 * command immediately, instead of going into an infinite
574 * (or even just a very long) retry loop.
576 if (++us
->last_sector_retries
< 3)
578 srb
->result
= SAM_STAT_CHECK_CONDITION
;
579 memcpy(srb
->sense_buffer
, record_not_found
,
580 sizeof(record_not_found
));
585 * Don't reset the retry counter for TEST UNIT READY commands,
586 * because they get issued after device resets which might be
587 * caused by a failed last-sector access.
589 if (srb
->cmnd
[0] != TEST_UNIT_READY
)
590 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
)
604 /* send the command to the transport layer */
605 scsi_set_resid(srb
, 0);
606 result
= us
->transport(srb
, us
);
609 * if the command gets aborted by the higher layers, we need to
610 * short-circuit all other processing
612 if (test_bit(US_FLIDX_TIMED_OUT
, &us
->dflags
)) {
613 usb_stor_dbg(us
, "-- command was aborted\n");
614 srb
->result
= DID_ABORT
<< 16;
618 /* if there is a transport error, reset and don't auto-sense */
619 if (result
== USB_STOR_TRANSPORT_ERROR
) {
620 usb_stor_dbg(us
, "-- transport indicates error, resetting\n");
621 srb
->result
= DID_ERROR
<< 16;
625 /* if the transport provided its own sense data, don't auto-sense */
626 if (result
== USB_STOR_TRANSPORT_NO_SENSE
) {
627 srb
->result
= SAM_STAT_CHECK_CONDITION
;
628 last_sector_hacks(us
, srb
);
632 srb
->result
= SAM_STAT_GOOD
;
635 * Determine if we need to auto-sense
637 * I normally don't use a flag like this, but it's almost impossible
638 * to understand what's going on here if I don't.
643 * If we're running the CB transport, which is incapable
644 * of determining status on its own, we will auto-sense
645 * unless the operation involved a data-in transfer. Devices
646 * can signal most data-in errors by stalling the bulk-in pipe.
648 if ((us
->protocol
== USB_PR_CB
|| us
->protocol
== USB_PR_DPCM_USB
) &&
649 srb
->sc_data_direction
!= DMA_FROM_DEVICE
) {
650 usb_stor_dbg(us
, "-- CB transport device requiring auto-sense\n");
655 * If we have a failure, we're going to do a REQUEST_SENSE
656 * automatically. Note that we differentiate between a command
657 * "failure" and an "error" in the transport mechanism.
659 if (result
== USB_STOR_TRANSPORT_FAILED
) {
660 usb_stor_dbg(us
, "-- transport indicates command failure\n");
665 * Determine if this device is SAT by seeing if the
666 * command executed successfully. Otherwise we'll have
667 * to wait for at least one CHECK_CONDITION to determine
670 if (unlikely((srb
->cmnd
[0] == ATA_16
|| srb
->cmnd
[0] == ATA_12
) &&
671 result
== USB_STOR_TRANSPORT_GOOD
&&
672 !(us
->fflags
& US_FL_SANE_SENSE
) &&
673 !(us
->fflags
& US_FL_BAD_SENSE
) &&
674 !(srb
->cmnd
[2] & 0x20))) {
675 usb_stor_dbg(us
, "-- SAT supported, increasing auto-sense\n");
676 us
->fflags
|= US_FL_SANE_SENSE
;
680 * A short transfer on a command where we don't expect it
681 * is unusual, but it doesn't mean we need to auto-sense.
683 if ((scsi_get_resid(srb
) > 0) &&
684 !((srb
->cmnd
[0] == REQUEST_SENSE
) ||
685 (srb
->cmnd
[0] == INQUIRY
) ||
686 (srb
->cmnd
[0] == MODE_SENSE
) ||
687 (srb
->cmnd
[0] == LOG_SENSE
) ||
688 (srb
->cmnd
[0] == MODE_SENSE_10
))) {
689 usb_stor_dbg(us
, "-- unexpectedly short transfer\n");
692 /* Now, if we need to do the auto-sense, let's do it */
693 if (need_auto_sense
) {
695 struct scsi_eh_save ses
;
696 int sense_size
= US_SENSE_SIZE
;
697 struct scsi_sense_hdr sshdr
;
701 /* device supports and needs bigger sense buffer */
702 if (us
->fflags
& US_FL_SANE_SENSE
)
705 usb_stor_dbg(us
, "Issuing auto-REQUEST_SENSE\n");
707 scsi_eh_prep_cmnd(srb
, &ses
, NULL
, 0, sense_size
);
709 /* FIXME: we must do the protocol translation here */
710 if (us
->subclass
== USB_SC_RBC
|| us
->subclass
== USB_SC_SCSI
||
711 us
->subclass
== USB_SC_CYP_ATACB
)
716 /* issue the auto-sense command */
717 scsi_set_resid(srb
, 0);
718 temp_result
= us
->transport(us
->srb
, us
);
720 /* let's clean up right away */
721 scsi_eh_restore_cmnd(srb
, &ses
);
723 if (test_bit(US_FLIDX_TIMED_OUT
, &us
->dflags
)) {
724 usb_stor_dbg(us
, "-- auto-sense aborted\n");
725 srb
->result
= DID_ABORT
<< 16;
727 /* If SANE_SENSE caused this problem, disable it */
728 if (sense_size
!= US_SENSE_SIZE
) {
729 us
->fflags
&= ~US_FL_SANE_SENSE
;
730 us
->fflags
|= US_FL_BAD_SENSE
;
736 * Some devices claim to support larger sense but fail when
737 * trying to request it. When a transport failure happens
738 * using US_FS_SANE_SENSE, we always retry with a standard
739 * (small) sense request. This fixes some USB GSM modems
741 if (temp_result
== USB_STOR_TRANSPORT_FAILED
&&
742 sense_size
!= US_SENSE_SIZE
) {
743 usb_stor_dbg(us
, "-- auto-sense failure, retry small sense\n");
744 sense_size
= US_SENSE_SIZE
;
745 us
->fflags
&= ~US_FL_SANE_SENSE
;
746 us
->fflags
|= US_FL_BAD_SENSE
;
751 if (temp_result
!= USB_STOR_TRANSPORT_GOOD
) {
752 usb_stor_dbg(us
, "-- auto-sense failure\n");
755 * we skip the reset if this happens to be a
756 * multi-target device, since failure of an
757 * auto-sense is perfectly valid
759 srb
->result
= DID_ERROR
<< 16;
760 if (!(us
->fflags
& US_FL_SCM_MULT_TARG
))
766 * If the sense data returned is larger than 18-bytes then we
767 * assume this device supports requesting more in the future.
768 * The response code must be 70h through 73h inclusive.
770 if (srb
->sense_buffer
[7] > (US_SENSE_SIZE
- 8) &&
771 !(us
->fflags
& US_FL_SANE_SENSE
) &&
772 !(us
->fflags
& US_FL_BAD_SENSE
) &&
773 (srb
->sense_buffer
[0] & 0x7C) == 0x70) {
774 usb_stor_dbg(us
, "-- SANE_SENSE support enabled\n");
775 us
->fflags
|= US_FL_SANE_SENSE
;
778 * Indicate to the user that we truncated their sense
779 * because we didn't know it supported larger sense.
781 usb_stor_dbg(us
, "-- Sense data truncated to %i from %i\n",
783 srb
->sense_buffer
[7] + 8);
784 srb
->sense_buffer
[7] = (US_SENSE_SIZE
- 8);
787 scsi_normalize_sense(srb
->sense_buffer
, SCSI_SENSE_BUFFERSIZE
,
790 usb_stor_dbg(us
, "-- Result from auto-sense is %d\n",
792 usb_stor_dbg(us
, "-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n",
793 sshdr
.response_code
, sshdr
.sense_key
,
794 sshdr
.asc
, sshdr
.ascq
);
795 #ifdef CONFIG_USB_STORAGE_DEBUG
796 usb_stor_show_sense(us
, sshdr
.sense_key
, sshdr
.asc
, sshdr
.ascq
);
799 /* set the result so the higher layers expect this data */
800 srb
->result
= SAM_STAT_CHECK_CONDITION
;
802 scdd
= scsi_sense_desc_find(srb
->sense_buffer
,
803 SCSI_SENSE_BUFFERSIZE
, 4);
804 fm_ili
= (scdd
? scdd
[3] : srb
->sense_buffer
[2]) & 0xA0;
807 * We often get empty sense data. This could indicate that
808 * everything worked or that there was an unspecified
809 * problem. We have to decide which.
811 if (sshdr
.sense_key
== 0 && sshdr
.asc
== 0 && sshdr
.ascq
== 0 &&
814 * If things are really okay, then let's show that.
815 * Zero out the sense buffer so the higher layers
816 * won't realize we did an unsolicited auto-sense.
818 if (result
== USB_STOR_TRANSPORT_GOOD
) {
819 srb
->result
= SAM_STAT_GOOD
;
820 srb
->sense_buffer
[0] = 0x0;
824 * ATA-passthru commands use sense data to report
825 * the command completion status, and often devices
826 * return Check Condition status when nothing is
829 else if (srb
->cmnd
[0] == ATA_16
||
830 srb
->cmnd
[0] == ATA_12
) {
831 /* leave the data alone */
835 * If there was a problem, report an unspecified
836 * hardware error to prevent the higher layers from
837 * entering an infinite retry loop.
840 srb
->result
= DID_ERROR
<< 16;
841 if ((sshdr
.response_code
& 0x72) == 0x72)
842 srb
->sense_buffer
[1] = HARDWARE_ERROR
;
844 srb
->sense_buffer
[2] = HARDWARE_ERROR
;
850 * Some devices don't work or return incorrect data the first
851 * time they get a READ(10) command, or for the first READ(10)
852 * after a media change. If the INITIAL_READ10 flag is set,
853 * keep track of whether READ(10) commands succeed. If the
854 * previous one succeeded and this one failed, set the REDO_READ10
855 * flag to force a retry.
857 if (unlikely((us
->fflags
& US_FL_INITIAL_READ10
) &&
858 srb
->cmnd
[0] == READ_10
)) {
859 if (srb
->result
== SAM_STAT_GOOD
) {
860 set_bit(US_FLIDX_READ10_WORKED
, &us
->dflags
);
861 } else if (test_bit(US_FLIDX_READ10_WORKED
, &us
->dflags
)) {
862 clear_bit(US_FLIDX_READ10_WORKED
, &us
->dflags
);
863 set_bit(US_FLIDX_REDO_READ10
, &us
->dflags
);
867 * Next, if the REDO_READ10 flag is set, return a result
868 * code that will cause the SCSI core to retry the READ(10)
869 * command immediately.
871 if (test_bit(US_FLIDX_REDO_READ10
, &us
->dflags
)) {
872 clear_bit(US_FLIDX_REDO_READ10
, &us
->dflags
);
873 srb
->result
= DID_IMM_RETRY
<< 16;
874 srb
->sense_buffer
[0] = 0;
878 /* Did we transfer less than the minimum amount required? */
879 if ((srb
->result
== SAM_STAT_GOOD
|| srb
->sense_buffer
[2] == 0) &&
880 scsi_bufflen(srb
) - scsi_get_resid(srb
) < srb
->underflow
)
881 srb
->result
= DID_ERROR
<< 16;
883 last_sector_hacks(us
, srb
);
887 * Error and abort processing: try to resynchronize with the device
888 * by issuing a port reset. If that fails, try a class-specific
894 * Set the RESETTING bit, and clear the ABORTING bit so that
895 * the reset may proceed.
897 scsi_lock(us_to_host(us
));
898 set_bit(US_FLIDX_RESETTING
, &us
->dflags
);
899 clear_bit(US_FLIDX_ABORTING
, &us
->dflags
);
900 scsi_unlock(us_to_host(us
));
903 * We must release the device lock because the pre_reset routine
904 * will want to acquire it.
906 mutex_unlock(&us
->dev_mutex
);
907 result
= usb_stor_port_reset(us
);
908 mutex_lock(&us
->dev_mutex
);
911 scsi_lock(us_to_host(us
));
912 usb_stor_report_device_reset(us
);
913 scsi_unlock(us_to_host(us
));
914 us
->transport_reset(us
);
916 clear_bit(US_FLIDX_RESETTING
, &us
->dflags
);
917 last_sector_hacks(us
, srb
);
920 /* Stop the current URB transfer */
921 void usb_stor_stop_transport(struct us_data
*us
)
924 * If the state machine is blocked waiting for an URB,
925 * let's wake it up. The test_and_clear_bit() call
926 * guarantees that if a URB has just been submitted,
927 * it won't be cancelled more than once.
929 if (test_and_clear_bit(US_FLIDX_URB_ACTIVE
, &us
->dflags
)) {
930 usb_stor_dbg(us
, "-- cancelling URB\n");
931 usb_unlink_urb(us
->current_urb
);
934 /* If we are waiting for a scatter-gather operation, cancel it. */
935 if (test_and_clear_bit(US_FLIDX_SG_ACTIVE
, &us
->dflags
)) {
936 usb_stor_dbg(us
, "-- cancelling sg request\n");
937 usb_sg_cancel(&us
->current_sg
);
942 * Control/Bulk and Control/Bulk/Interrupt transport
945 int usb_stor_CB_transport(struct scsi_cmnd
*srb
, struct us_data
*us
)
947 unsigned int transfer_length
= scsi_bufflen(srb
);
948 unsigned int pipe
= 0;
952 /* let's send the command via the control pipe */
954 * Command is sometime (f.e. after scsi_eh_prep_cmnd) on the stack.
955 * Stack may be vmallocated. So no DMA for us. Make a copy.
957 memcpy(us
->iobuf
, srb
->cmnd
, srb
->cmd_len
);
958 result
= usb_stor_ctrl_transfer(us
, us
->send_ctrl_pipe
,
960 USB_TYPE_CLASS
| USB_RECIP_INTERFACE
, 0,
961 us
->ifnum
, us
->iobuf
, srb
->cmd_len
);
963 /* check the return code for the command */
964 usb_stor_dbg(us
, "Call to usb_stor_ctrl_transfer() returned %d\n",
967 /* if we stalled the command, it means command failed */
968 if (result
== USB_STOR_XFER_STALLED
) {
969 return USB_STOR_TRANSPORT_FAILED
;
972 /* Uh oh... serious problem here */
973 if (result
!= USB_STOR_XFER_GOOD
) {
974 return USB_STOR_TRANSPORT_ERROR
;
978 /* transfer the data payload for this command, if one exists*/
979 if (transfer_length
) {
980 pipe
= srb
->sc_data_direction
== DMA_FROM_DEVICE
?
981 us
->recv_bulk_pipe
: us
->send_bulk_pipe
;
982 result
= usb_stor_bulk_srb(us
, pipe
, srb
);
983 usb_stor_dbg(us
, "CBI data stage result is 0x%x\n", result
);
985 /* if we stalled the data transfer it means command failed */
986 if (result
== USB_STOR_XFER_STALLED
)
987 return USB_STOR_TRANSPORT_FAILED
;
988 if (result
> USB_STOR_XFER_STALLED
)
989 return USB_STOR_TRANSPORT_ERROR
;
995 * NOTE: CB does not have a status stage. Silly, I know. So
996 * we have to catch this at a higher level.
998 if (us
->protocol
!= USB_PR_CBI
)
999 return USB_STOR_TRANSPORT_GOOD
;
1001 result
= usb_stor_intr_transfer(us
, us
->iobuf
, 2);
1002 usb_stor_dbg(us
, "Got interrupt data (0x%x, 0x%x)\n",
1003 us
->iobuf
[0], us
->iobuf
[1]);
1004 if (result
!= USB_STOR_XFER_GOOD
)
1005 return USB_STOR_TRANSPORT_ERROR
;
1008 * UFI gives us ASC and ASCQ, like a request sense
1010 * REQUEST_SENSE and INQUIRY don't affect the sense data on UFI
1011 * devices, so we ignore the information for those commands. Note
1012 * that this means we could be ignoring a real error on these
1013 * commands, but that can't be helped.
1015 if (us
->subclass
== USB_SC_UFI
) {
1016 if (srb
->cmnd
[0] == REQUEST_SENSE
||
1017 srb
->cmnd
[0] == INQUIRY
)
1018 return USB_STOR_TRANSPORT_GOOD
;
1021 return USB_STOR_TRANSPORT_GOOD
;
1025 * If not UFI, we interpret the data as a result code
1026 * The first byte should always be a 0x0.
1028 * Some bogus devices don't follow that rule. They stuff the ASC
1029 * into the first byte -- so if it's non-zero, call it a failure.
1032 usb_stor_dbg(us
, "CBI IRQ data showed reserved bType 0x%x\n",
1038 /* The second byte & 0x0F should be 0x0 for good, otherwise error */
1039 switch (us
->iobuf
[1] & 0x0F) {
1041 return USB_STOR_TRANSPORT_GOOD
;
1045 return USB_STOR_TRANSPORT_ERROR
;
1048 * the CBI spec requires that the bulk pipe must be cleared
1049 * following any data-in/out command failure (section 2.4.3.1.3)
1053 usb_stor_clear_halt(us
, pipe
);
1054 return USB_STOR_TRANSPORT_FAILED
;
1056 EXPORT_SYMBOL_GPL(usb_stor_CB_transport
);
1059 * Bulk only transport
1062 /* Determine what the maximum LUN supported is */
1063 int usb_stor_Bulk_max_lun(struct us_data
*us
)
1067 /* issue the command */
1069 result
= usb_stor_control_msg(us
, us
->recv_ctrl_pipe
,
1070 US_BULK_GET_MAX_LUN
,
1071 USB_DIR_IN
| USB_TYPE_CLASS
|
1072 USB_RECIP_INTERFACE
,
1073 0, us
->ifnum
, us
->iobuf
, 1, 10*HZ
);
1075 usb_stor_dbg(us
, "GetMaxLUN command result is %d, data is %d\n",
1076 result
, us
->iobuf
[0]);
1079 * If we have a successful request, return the result if valid. The
1080 * CBW LUN field is 4 bits wide, so the value reported by the device
1081 * should fit into that.
1084 if (us
->iobuf
[0] < 16) {
1085 return us
->iobuf
[0];
1087 dev_info(&us
->pusb_intf
->dev
,
1088 "Max LUN %d is not valid, using 0 instead",
1094 * Some devices don't like GetMaxLUN. They may STALL the control
1095 * pipe, they may return a zero-length result, they may do nothing at
1096 * all and timeout, or they may fail in even more bizarrely creative
1097 * ways. In these cases the best approach is to use the default
1098 * value: only one LUN.
1103 int usb_stor_Bulk_transport(struct scsi_cmnd
*srb
, struct us_data
*us
)
1105 struct bulk_cb_wrap
*bcb
= (struct bulk_cb_wrap
*) us
->iobuf
;
1106 struct bulk_cs_wrap
*bcs
= (struct bulk_cs_wrap
*) us
->iobuf
;
1107 unsigned int transfer_length
= scsi_bufflen(srb
);
1108 unsigned int residue
;
1111 unsigned int cswlen
;
1112 unsigned int cbwlen
= US_BULK_CB_WRAP_LEN
;
1114 /* Take care of BULK32 devices; set extra byte to 0 */
1115 if (unlikely(us
->fflags
& US_FL_BULK32
)) {
1120 /* set up the command wrapper */
1121 bcb
->Signature
= cpu_to_le32(US_BULK_CB_SIGN
);
1122 bcb
->DataTransferLength
= cpu_to_le32(transfer_length
);
1123 bcb
->Flags
= srb
->sc_data_direction
== DMA_FROM_DEVICE
?
1124 US_BULK_FLAG_IN
: 0;
1125 bcb
->Tag
= ++us
->tag
;
1126 bcb
->Lun
= srb
->device
->lun
;
1127 if (us
->fflags
& US_FL_SCM_MULT_TARG
)
1128 bcb
->Lun
|= srb
->device
->id
<< 4;
1129 bcb
->Length
= srb
->cmd_len
;
1131 /* copy the command payload */
1132 memset(bcb
->CDB
, 0, sizeof(bcb
->CDB
));
1133 memcpy(bcb
->CDB
, srb
->cmnd
, bcb
->Length
);
1135 /* send it to out endpoint */
1136 usb_stor_dbg(us
, "Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n",
1137 le32_to_cpu(bcb
->Signature
), bcb
->Tag
,
1138 le32_to_cpu(bcb
->DataTransferLength
), bcb
->Flags
,
1139 (bcb
->Lun
>> 4), (bcb
->Lun
& 0x0F),
1141 result
= usb_stor_bulk_transfer_buf(us
, us
->send_bulk_pipe
,
1143 usb_stor_dbg(us
, "Bulk command transfer result=%d\n", result
);
1144 if (result
!= USB_STOR_XFER_GOOD
)
1145 return USB_STOR_TRANSPORT_ERROR
;
1148 /* send/receive data payload, if there is any */
1151 * Some USB-IDE converter chips need a 100us delay between the
1152 * command phase and the data phase. Some devices need a little
1153 * more than that, probably because of clock rate inaccuracies.
1155 if (unlikely(us
->fflags
& US_FL_GO_SLOW
))
1156 usleep_range(125, 150);
1158 if (transfer_length
) {
1159 unsigned int pipe
= srb
->sc_data_direction
== DMA_FROM_DEVICE
?
1160 us
->recv_bulk_pipe
: us
->send_bulk_pipe
;
1161 result
= usb_stor_bulk_srb(us
, pipe
, srb
);
1162 usb_stor_dbg(us
, "Bulk data transfer result 0x%x\n", result
);
1163 if (result
== USB_STOR_XFER_ERROR
)
1164 return USB_STOR_TRANSPORT_ERROR
;
1167 * If the device tried to send back more data than the
1168 * amount requested, the spec requires us to transfer
1169 * the CSW anyway. Since there's no point retrying the
1170 * the command, we'll return fake sense data indicating
1171 * Illegal Request, Invalid Field in CDB.
1173 if (result
== USB_STOR_XFER_LONG
)
1177 * Sometimes a device will mistakenly skip the data phase
1178 * and go directly to the status phase without sending a
1179 * zero-length packet. If we get a 13-byte response here,
1180 * check whether it really is a CSW.
1182 if (result
== USB_STOR_XFER_SHORT
&&
1183 srb
->sc_data_direction
== DMA_FROM_DEVICE
&&
1184 transfer_length
- scsi_get_resid(srb
) ==
1185 US_BULK_CS_WRAP_LEN
) {
1186 struct scatterlist
*sg
= NULL
;
1187 unsigned int offset
= 0;
1189 if (usb_stor_access_xfer_buf((unsigned char *) bcs
,
1190 US_BULK_CS_WRAP_LEN
, srb
, &sg
,
1191 &offset
, FROM_XFER_BUF
) ==
1192 US_BULK_CS_WRAP_LEN
&&
1194 cpu_to_le32(US_BULK_CS_SIGN
)) {
1195 usb_stor_dbg(us
, "Device skipped data phase\n");
1196 scsi_set_resid(srb
, transfer_length
);
1197 goto skipped_data_phase
;
1203 * See flow chart on pg 15 of the Bulk Only Transport spec for
1204 * an explanation of how this code works.
1207 /* get CSW for device status */
1208 usb_stor_dbg(us
, "Attempting to get CSW...\n");
1209 result
= usb_stor_bulk_transfer_buf(us
, us
->recv_bulk_pipe
,
1210 bcs
, US_BULK_CS_WRAP_LEN
, &cswlen
);
1213 * Some broken devices add unnecessary zero-length packets to the
1214 * end of their data transfers. Such packets show up as 0-length
1215 * CSWs. If we encounter such a thing, try to read the CSW again.
1217 if (result
== USB_STOR_XFER_SHORT
&& cswlen
== 0) {
1218 usb_stor_dbg(us
, "Received 0-length CSW; retrying...\n");
1219 result
= usb_stor_bulk_transfer_buf(us
, us
->recv_bulk_pipe
,
1220 bcs
, US_BULK_CS_WRAP_LEN
, &cswlen
);
1223 /* did the attempt to read the CSW fail? */
1224 if (result
== USB_STOR_XFER_STALLED
) {
1226 /* get the status again */
1227 usb_stor_dbg(us
, "Attempting to get CSW (2nd try)...\n");
1228 result
= usb_stor_bulk_transfer_buf(us
, us
->recv_bulk_pipe
,
1229 bcs
, US_BULK_CS_WRAP_LEN
, NULL
);
1232 /* if we still have a failure at this point, we're in trouble */
1233 usb_stor_dbg(us
, "Bulk status result = %d\n", result
);
1234 if (result
!= USB_STOR_XFER_GOOD
)
1235 return USB_STOR_TRANSPORT_ERROR
;
1238 /* check bulk status */
1239 residue
= le32_to_cpu(bcs
->Residue
);
1240 usb_stor_dbg(us
, "Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n",
1241 le32_to_cpu(bcs
->Signature
), bcs
->Tag
,
1242 residue
, bcs
->Status
);
1243 if (!(bcs
->Tag
== us
->tag
|| (us
->fflags
& US_FL_BULK_IGNORE_TAG
)) ||
1244 bcs
->Status
> US_BULK_STAT_PHASE
) {
1245 usb_stor_dbg(us
, "Bulk logical error\n");
1246 return USB_STOR_TRANSPORT_ERROR
;
1250 * Some broken devices report odd signatures, so we do not check them
1251 * for validity against the spec. We store the first one we see,
1252 * and check subsequent transfers for validity against this signature.
1254 if (!us
->bcs_signature
) {
1255 us
->bcs_signature
= bcs
->Signature
;
1256 if (us
->bcs_signature
!= cpu_to_le32(US_BULK_CS_SIGN
))
1257 usb_stor_dbg(us
, "Learnt BCS signature 0x%08X\n",
1258 le32_to_cpu(us
->bcs_signature
));
1259 } else if (bcs
->Signature
!= us
->bcs_signature
) {
1260 usb_stor_dbg(us
, "Signature mismatch: got %08X, expecting %08X\n",
1261 le32_to_cpu(bcs
->Signature
),
1262 le32_to_cpu(us
->bcs_signature
));
1263 return USB_STOR_TRANSPORT_ERROR
;
1267 * try to compute the actual residue, based on how much data
1268 * was really transferred and what the device tells us
1270 if (residue
&& !(us
->fflags
& US_FL_IGNORE_RESIDUE
)) {
1273 * Heuristically detect devices that generate bogus residues
1274 * by seeing what happens with INQUIRY and READ CAPACITY
1277 if (bcs
->Status
== US_BULK_STAT_OK
&&
1278 scsi_get_resid(srb
) == 0 &&
1279 ((srb
->cmnd
[0] == INQUIRY
&&
1280 transfer_length
== 36) ||
1281 (srb
->cmnd
[0] == READ_CAPACITY
&&
1282 transfer_length
== 8))) {
1283 us
->fflags
|= US_FL_IGNORE_RESIDUE
;
1286 residue
= min(residue
, transfer_length
);
1287 scsi_set_resid(srb
, max(scsi_get_resid(srb
),
1292 /* based on the status code, we report good or bad */
1293 switch (bcs
->Status
) {
1294 case US_BULK_STAT_OK
:
1295 /* device babbled -- return fake sense data */
1297 memcpy(srb
->sense_buffer
,
1298 usb_stor_sense_invalidCDB
,
1299 sizeof(usb_stor_sense_invalidCDB
));
1300 return USB_STOR_TRANSPORT_NO_SENSE
;
1303 /* command good -- note that data could be short */
1304 return USB_STOR_TRANSPORT_GOOD
;
1306 case US_BULK_STAT_FAIL
:
1307 /* command failed */
1308 return USB_STOR_TRANSPORT_FAILED
;
1310 case US_BULK_STAT_PHASE
:
1312 * phase error -- note that a transport reset will be
1313 * invoked by the invoke_transport() function
1315 return USB_STOR_TRANSPORT_ERROR
;
1318 /* we should never get here, but if we do, we're in trouble */
1319 return USB_STOR_TRANSPORT_ERROR
;
1321 EXPORT_SYMBOL_GPL(usb_stor_Bulk_transport
);
1323 /***********************************************************************
1325 ***********************************************************************/
1328 * This is the common part of the device reset code.
1330 * It's handy that every transport mechanism uses the control endpoint for
1333 * Basically, we send a reset with a 5-second timeout, so we don't get
1334 * jammed attempting to do the reset.
1336 static int usb_stor_reset_common(struct us_data
*us
,
1337 u8 request
, u8 requesttype
,
1338 u16 value
, u16 index
, void *data
, u16 size
)
1343 if (test_bit(US_FLIDX_DISCONNECTING
, &us
->dflags
)) {
1344 usb_stor_dbg(us
, "No reset during disconnect\n");
1348 result
= usb_stor_control_msg(us
, us
->send_ctrl_pipe
,
1349 request
, requesttype
, value
, index
, data
, size
,
1352 usb_stor_dbg(us
, "Soft reset failed: %d\n", result
);
1357 * Give the device some time to recover from the reset,
1358 * but don't delay disconnect processing.
1360 wait_event_interruptible_timeout(us
->delay_wait
,
1361 test_bit(US_FLIDX_DISCONNECTING
, &us
->dflags
),
1363 if (test_bit(US_FLIDX_DISCONNECTING
, &us
->dflags
)) {
1364 usb_stor_dbg(us
, "Reset interrupted by disconnect\n");
1368 usb_stor_dbg(us
, "Soft reset: clearing bulk-in endpoint halt\n");
1369 result
= usb_stor_clear_halt(us
, us
->recv_bulk_pipe
);
1371 usb_stor_dbg(us
, "Soft reset: clearing bulk-out endpoint halt\n");
1372 result2
= usb_stor_clear_halt(us
, us
->send_bulk_pipe
);
1374 /* return a result code based on the result of the clear-halts */
1378 usb_stor_dbg(us
, "Soft reset failed\n");
1380 usb_stor_dbg(us
, "Soft reset done\n");
1384 /* This issues a CB[I] Reset to the device in question */
1385 #define CB_RESET_CMD_SIZE 12
1387 int usb_stor_CB_reset(struct us_data
*us
)
1389 memset(us
->iobuf
, 0xFF, CB_RESET_CMD_SIZE
);
1390 us
->iobuf
[0] = SEND_DIAGNOSTIC
;
1392 return usb_stor_reset_common(us
, US_CBI_ADSC
,
1393 USB_TYPE_CLASS
| USB_RECIP_INTERFACE
,
1394 0, us
->ifnum
, us
->iobuf
, CB_RESET_CMD_SIZE
);
1396 EXPORT_SYMBOL_GPL(usb_stor_CB_reset
);
1399 * This issues a Bulk-only Reset to the device in question, including
1400 * clearing the subsequent endpoint halts that may occur.
1402 int usb_stor_Bulk_reset(struct us_data
*us
)
1404 return usb_stor_reset_common(us
, US_BULK_RESET_REQUEST
,
1405 USB_TYPE_CLASS
| USB_RECIP_INTERFACE
,
1406 0, us
->ifnum
, NULL
, 0);
1408 EXPORT_SYMBOL_GPL(usb_stor_Bulk_reset
);
1411 * Issue a USB port reset to the device. The caller must not hold
1414 int usb_stor_port_reset(struct us_data
*us
)
1418 /*for these devices we must use the class specific method */
1419 if (us
->pusb_dev
->quirks
& USB_QUIRK_RESET
)
1422 result
= usb_lock_device_for_reset(us
->pusb_dev
, us
->pusb_intf
);
1424 usb_stor_dbg(us
, "unable to lock device for reset: %d\n",
1427 /* Were we disconnected while waiting for the lock? */
1428 if (test_bit(US_FLIDX_DISCONNECTING
, &us
->dflags
)) {
1430 usb_stor_dbg(us
, "No reset during disconnect\n");
1432 result
= usb_reset_device(us
->pusb_dev
);
1433 usb_stor_dbg(us
, "usb_reset_device returns %d\n",
1436 usb_unlock_device(us
->pusb_dev
);