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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
f0183a33 FB |
2 | /* |
3 | * Driver for USB Mass Storage compliant devices | |
1da177e4 LT |
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 | * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more | |
31 | * information about this driver. | |
32 | * | |
33 | * This program is free software; you can redistribute it and/or modify it | |
34 | * under the terms of the GNU General Public License as published by the | |
35 | * Free Software Foundation; either version 2, or (at your option) any | |
36 | * later version. | |
37 | * | |
38 | * This program is distributed in the hope that it will be useful, but | |
39 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
40 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41 | * General Public License for more details. | |
42 | * | |
43 | * You should have received a copy of the GNU General Public License along | |
44 | * with this program; if not, write to the Free Software Foundation, Inc., | |
45 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
46 | */ | |
47 | ||
1da177e4 | 48 | #include <linux/sched.h> |
5a0e3ad6 | 49 | #include <linux/gfp.h> |
1da177e4 | 50 | #include <linux/errno.h> |
f940fcd8 | 51 | #include <linux/export.h> |
1da177e4 | 52 | |
5d398779 ON |
53 | #include <linux/usb/quirks.h> |
54 | ||
1da177e4 | 55 | #include <scsi/scsi.h> |
dff6de73 | 56 | #include <scsi/scsi_eh.h> |
1da177e4 LT |
57 | #include <scsi/scsi_device.h> |
58 | ||
59 | #include "usb.h" | |
60 | #include "transport.h" | |
61 | #include "protocol.h" | |
62 | #include "scsiglue.h" | |
63 | #include "debug.h" | |
64 | ||
25ff1c31 AS |
65 | #include <linux/blkdev.h> |
66 | #include "../../scsi/sd.h" | |
67 | ||
1da177e4 LT |
68 | |
69 | /*********************************************************************** | |
70 | * Data transfer routines | |
71 | ***********************************************************************/ | |
72 | ||
73 | /* | |
74 | * This is subtle, so pay attention: | |
75 | * --------------------------------- | |
76 | * We're very concerned about races with a command abort. Hanging this code | |
77 | * is a sure fire way to hang the kernel. (Note that this discussion applies | |
78 | * only to transactions resulting from a scsi queued-command, since only | |
79 | * these transactions are subject to a scsi abort. Other transactions, such | |
80 | * as those occurring during device-specific initialization, must be handled | |
81 | * by a separate code path.) | |
82 | * | |
83 | * The abort function (usb_storage_command_abort() in scsiglue.c) first | |
7e4d6c38 | 84 | * sets the machine state and the ABORTING bit in us->dflags to prevent |
1da177e4 | 85 | * new URBs from being submitted. It then calls usb_stor_stop_transport() |
7e4d6c38 | 86 | * below, which atomically tests-and-clears the URB_ACTIVE bit in us->dflags |
1da177e4 LT |
87 | * to see if the current_urb needs to be stopped. Likewise, the SG_ACTIVE |
88 | * bit is tested to see if the current_sg scatter-gather request needs to be | |
89 | * stopped. The timeout callback routine does much the same thing. | |
90 | * | |
7e4d6c38 | 91 | * When a disconnect occurs, the DISCONNECTING bit in us->dflags is set to |
1da177e4 LT |
92 | * prevent new URBs from being submitted, and usb_stor_stop_transport() is |
93 | * called to stop any ongoing requests. | |
94 | * | |
95 | * The submit function first verifies that the submitting is allowed | |
96 | * (neither ABORTING nor DISCONNECTING bits are set) and that the submit | |
97 | * completes without errors, and only then sets the URB_ACTIVE bit. This | |
98 | * prevents the stop_transport() function from trying to cancel the URB | |
99 | * while the submit call is underway. Next, the submit function must test | |
100 | * the flags to see if an abort or disconnect occurred during the submission | |
101 | * or before the URB_ACTIVE bit was set. If so, it's essential to cancel | |
102 | * the URB if it hasn't been cancelled already (i.e., if the URB_ACTIVE bit | |
103 | * is still set). Either way, the function must then wait for the URB to | |
b375a049 AS |
104 | * finish. Note that the URB can still be in progress even after a call to |
105 | * usb_unlink_urb() returns. | |
1da177e4 LT |
106 | * |
107 | * The idea is that (1) once the ABORTING or DISCONNECTING bit is set, | |
108 | * either the stop_transport() function or the submitting function | |
109 | * is guaranteed to call usb_unlink_urb() for an active URB, | |
110 | * and (2) test_and_clear_bit() prevents usb_unlink_urb() from being | |
111 | * called more than once or from being called during usb_submit_urb(). | |
112 | */ | |
113 | ||
f0183a33 FB |
114 | /* |
115 | * This is the completion handler which will wake us up when an URB | |
1da177e4 LT |
116 | * completes. |
117 | */ | |
7d12e780 | 118 | static void usb_stor_blocking_completion(struct urb *urb) |
1da177e4 | 119 | { |
cdc97792 | 120 | struct completion *urb_done_ptr = urb->context; |
1da177e4 LT |
121 | |
122 | complete(urb_done_ptr); | |
123 | } | |
1da177e4 | 124 | |
f0183a33 FB |
125 | /* |
126 | * This is the common part of the URB message submission code | |
1da177e4 LT |
127 | * |
128 | * All URBs from the usb-storage driver involved in handling a queued scsi | |
129 | * command _must_ pass through this function (or something like it) for the | |
130 | * abort mechanisms to work properly. | |
131 | */ | |
132 | static int usb_stor_msg_common(struct us_data *us, int timeout) | |
133 | { | |
134 | struct completion urb_done; | |
3428cc43 | 135 | long timeleft; |
1da177e4 LT |
136 | int status; |
137 | ||
543f7810 AS |
138 | /* don't submit URBs during abort processing */ |
139 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) | |
1da177e4 LT |
140 | return -EIO; |
141 | ||
142 | /* set up data structures for the wakeup system */ | |
143 | init_completion(&urb_done); | |
144 | ||
145 | /* fill the common fields in the URB */ | |
146 | us->current_urb->context = &urb_done; | |
c222fb2e | 147 | us->current_urb->transfer_flags = 0; |
1da177e4 | 148 | |
f0183a33 FB |
149 | /* |
150 | * we assume that if transfer_buffer isn't us->iobuf then it | |
1da177e4 LT |
151 | * hasn't been mapped for DMA. Yes, this is clunky, but it's |
152 | * easier than always having the caller tell us whether the | |
f0183a33 FB |
153 | * transfer buffer has already been mapped. |
154 | */ | |
1da177e4 LT |
155 | if (us->current_urb->transfer_buffer == us->iobuf) |
156 | us->current_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
157 | us->current_urb->transfer_dma = us->iobuf_dma; | |
1da177e4 LT |
158 | |
159 | /* submit the URB */ | |
160 | status = usb_submit_urb(us->current_urb, GFP_NOIO); | |
161 | if (status) { | |
162 | /* something went wrong */ | |
163 | return status; | |
164 | } | |
165 | ||
f0183a33 FB |
166 | /* |
167 | * since the URB has been submitted successfully, it's now okay | |
168 | * to cancel it | |
169 | */ | |
7e4d6c38 | 170 | set_bit(US_FLIDX_URB_ACTIVE, &us->dflags); |
1da177e4 | 171 | |
543f7810 AS |
172 | /* did an abort occur during the submission? */ |
173 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { | |
1da177e4 LT |
174 | |
175 | /* cancel the URB, if it hasn't been cancelled already */ | |
7e4d6c38 | 176 | if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { |
191648d0 | 177 | usb_stor_dbg(us, "-- cancelling URB\n"); |
1da177e4 LT |
178 | usb_unlink_urb(us->current_urb); |
179 | } | |
180 | } | |
181 | ||
1da177e4 | 182 | /* wait for the completion of the URB */ |
3428cc43 FBH |
183 | timeleft = wait_for_completion_interruptible_timeout( |
184 | &urb_done, timeout ? : MAX_SCHEDULE_TIMEOUT); | |
1da177e4 | 185 | |
7e4d6c38 | 186 | clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags); |
3428cc43 FBH |
187 | |
188 | if (timeleft <= 0) { | |
191648d0 JP |
189 | usb_stor_dbg(us, "%s -- cancelling URB\n", |
190 | timeleft == 0 ? "Timeout" : "Signal"); | |
d6b7d3b6 | 191 | usb_kill_urb(us->current_urb); |
3428cc43 | 192 | } |
1da177e4 LT |
193 | |
194 | /* return the URB status */ | |
195 | return us->current_urb->status; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Transfer one control message, with timeouts, and allowing early | |
200 | * termination. Return codes are usual -Exxx, *not* USB_STOR_XFER_xxx. | |
201 | */ | |
202 | int usb_stor_control_msg(struct us_data *us, unsigned int pipe, | |
203 | u8 request, u8 requesttype, u16 value, u16 index, | |
204 | void *data, u16 size, int timeout) | |
205 | { | |
206 | int status; | |
207 | ||
191648d0 JP |
208 | usb_stor_dbg(us, "rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", |
209 | request, requesttype, value, index, size); | |
1da177e4 LT |
210 | |
211 | /* fill in the devrequest structure */ | |
212 | us->cr->bRequestType = requesttype; | |
213 | us->cr->bRequest = request; | |
214 | us->cr->wValue = cpu_to_le16(value); | |
215 | us->cr->wIndex = cpu_to_le16(index); | |
216 | us->cr->wLength = cpu_to_le16(size); | |
217 | ||
218 | /* fill and submit the URB */ | |
219 | usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, | |
220 | (unsigned char*) us->cr, data, size, | |
221 | usb_stor_blocking_completion, NULL); | |
222 | status = usb_stor_msg_common(us, timeout); | |
223 | ||
224 | /* return the actual length of the data transferred if no error */ | |
225 | if (status == 0) | |
226 | status = us->current_urb->actual_length; | |
227 | return status; | |
228 | } | |
e6e244b6 | 229 | EXPORT_SYMBOL_GPL(usb_stor_control_msg); |
1da177e4 | 230 | |
f0183a33 FB |
231 | /* |
232 | * This is a version of usb_clear_halt() that allows early termination and | |
1da177e4 LT |
233 | * doesn't read the status from the device -- this is because some devices |
234 | * crash their internal firmware when the status is requested after a halt. | |
235 | * | |
236 | * A definitive list of these 'bad' devices is too difficult to maintain or | |
237 | * make complete enough to be useful. This problem was first observed on the | |
238 | * Hagiwara FlashGate DUAL unit. However, bus traces reveal that neither | |
239 | * MacOS nor Windows checks the status after clearing a halt. | |
240 | * | |
241 | * Since many vendors in this space limit their testing to interoperability | |
242 | * with these two OSes, specification violations like this one are common. | |
243 | */ | |
244 | int usb_stor_clear_halt(struct us_data *us, unsigned int pipe) | |
245 | { | |
246 | int result; | |
247 | int endp = usb_pipeendpoint(pipe); | |
248 | ||
249 | if (usb_pipein (pipe)) | |
250 | endp |= USB_DIR_IN; | |
251 | ||
252 | result = usb_stor_control_msg(us, us->send_ctrl_pipe, | |
253 | USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, | |
254 | USB_ENDPOINT_HALT, endp, | |
255 | NULL, 0, 3*HZ); | |
256 | ||
5203ad44 | 257 | if (result >= 0) |
3444b26a | 258 | usb_reset_endpoint(us->pusb_dev, endp); |
1da177e4 | 259 | |
191648d0 | 260 | usb_stor_dbg(us, "result = %d\n", result); |
1da177e4 LT |
261 | return result; |
262 | } | |
e6e244b6 | 263 | EXPORT_SYMBOL_GPL(usb_stor_clear_halt); |
1da177e4 LT |
264 | |
265 | ||
266 | /* | |
267 | * Interpret the results of a URB transfer | |
268 | * | |
269 | * This function prints appropriate debugging messages, clears halts on | |
270 | * non-control endpoints, and translates the status to the corresponding | |
271 | * USB_STOR_XFER_xxx return code. | |
272 | */ | |
273 | static int interpret_urb_result(struct us_data *us, unsigned int pipe, | |
274 | unsigned int length, int result, unsigned int partial) | |
275 | { | |
191648d0 JP |
276 | usb_stor_dbg(us, "Status code %d; transferred %u/%u\n", |
277 | result, partial, length); | |
1da177e4 LT |
278 | switch (result) { |
279 | ||
280 | /* no error code; did we send all the data? */ | |
281 | case 0: | |
282 | if (partial != length) { | |
191648d0 | 283 | usb_stor_dbg(us, "-- short transfer\n"); |
1da177e4 LT |
284 | return USB_STOR_XFER_SHORT; |
285 | } | |
286 | ||
191648d0 | 287 | usb_stor_dbg(us, "-- transfer complete\n"); |
1da177e4 LT |
288 | return USB_STOR_XFER_GOOD; |
289 | ||
290 | /* stalled */ | |
291 | case -EPIPE: | |
f0183a33 FB |
292 | /* |
293 | * for control endpoints, (used by CB[I]) a stall indicates | |
294 | * a failed command | |
295 | */ | |
1da177e4 | 296 | if (usb_pipecontrol(pipe)) { |
191648d0 | 297 | usb_stor_dbg(us, "-- stall on control pipe\n"); |
1da177e4 LT |
298 | return USB_STOR_XFER_STALLED; |
299 | } | |
300 | ||
301 | /* for other sorts of endpoint, clear the stall */ | |
191648d0 JP |
302 | usb_stor_dbg(us, "clearing endpoint halt for pipe 0x%x\n", |
303 | pipe); | |
1da177e4 LT |
304 | if (usb_stor_clear_halt(us, pipe) < 0) |
305 | return USB_STOR_XFER_ERROR; | |
306 | return USB_STOR_XFER_STALLED; | |
307 | ||
1da177e4 LT |
308 | /* babble - the device tried to send more than we wanted to read */ |
309 | case -EOVERFLOW: | |
191648d0 | 310 | usb_stor_dbg(us, "-- babble\n"); |
1da177e4 LT |
311 | return USB_STOR_XFER_LONG; |
312 | ||
313 | /* the transfer was cancelled by abort, disconnect, or timeout */ | |
314 | case -ECONNRESET: | |
191648d0 | 315 | usb_stor_dbg(us, "-- transfer cancelled\n"); |
1da177e4 LT |
316 | return USB_STOR_XFER_ERROR; |
317 | ||
318 | /* short scatter-gather read transfer */ | |
319 | case -EREMOTEIO: | |
191648d0 | 320 | usb_stor_dbg(us, "-- short read transfer\n"); |
1da177e4 LT |
321 | return USB_STOR_XFER_SHORT; |
322 | ||
323 | /* abort or disconnect in progress */ | |
324 | case -EIO: | |
191648d0 | 325 | usb_stor_dbg(us, "-- abort or disconnect in progress\n"); |
1da177e4 LT |
326 | return USB_STOR_XFER_ERROR; |
327 | ||
328 | /* the catch-all error case */ | |
329 | default: | |
191648d0 | 330 | usb_stor_dbg(us, "-- unknown error\n"); |
1da177e4 LT |
331 | return USB_STOR_XFER_ERROR; |
332 | } | |
333 | } | |
334 | ||
335 | /* | |
336 | * Transfer one control message, without timeouts, but allowing early | |
337 | * termination. Return codes are USB_STOR_XFER_xxx. | |
338 | */ | |
339 | int usb_stor_ctrl_transfer(struct us_data *us, unsigned int pipe, | |
340 | u8 request, u8 requesttype, u16 value, u16 index, | |
341 | void *data, u16 size) | |
342 | { | |
343 | int result; | |
344 | ||
191648d0 JP |
345 | usb_stor_dbg(us, "rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", |
346 | request, requesttype, value, index, size); | |
1da177e4 LT |
347 | |
348 | /* fill in the devrequest structure */ | |
349 | us->cr->bRequestType = requesttype; | |
350 | us->cr->bRequest = request; | |
351 | us->cr->wValue = cpu_to_le16(value); | |
352 | us->cr->wIndex = cpu_to_le16(index); | |
353 | us->cr->wLength = cpu_to_le16(size); | |
354 | ||
355 | /* fill and submit the URB */ | |
356 | usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, | |
357 | (unsigned char*) us->cr, data, size, | |
358 | usb_stor_blocking_completion, NULL); | |
359 | result = usb_stor_msg_common(us, 0); | |
360 | ||
361 | return interpret_urb_result(us, pipe, size, result, | |
362 | us->current_urb->actual_length); | |
363 | } | |
e6e244b6 | 364 | EXPORT_SYMBOL_GPL(usb_stor_ctrl_transfer); |
1da177e4 LT |
365 | |
366 | /* | |
367 | * Receive one interrupt buffer, without timeouts, but allowing early | |
368 | * termination. Return codes are USB_STOR_XFER_xxx. | |
369 | * | |
370 | * This routine always uses us->recv_intr_pipe as the pipe and | |
371 | * us->ep_bInterval as the interrupt interval. | |
372 | */ | |
373 | static int usb_stor_intr_transfer(struct us_data *us, void *buf, | |
374 | unsigned int length) | |
375 | { | |
376 | int result; | |
377 | unsigned int pipe = us->recv_intr_pipe; | |
378 | unsigned int maxp; | |
379 | ||
191648d0 | 380 | usb_stor_dbg(us, "xfer %u bytes\n", length); |
1da177e4 LT |
381 | |
382 | /* calculate the max packet size */ | |
383 | maxp = usb_maxpacket(us->pusb_dev, pipe, usb_pipeout(pipe)); | |
384 | if (maxp > length) | |
385 | maxp = length; | |
386 | ||
387 | /* fill and submit the URB */ | |
388 | usb_fill_int_urb(us->current_urb, us->pusb_dev, pipe, buf, | |
389 | maxp, usb_stor_blocking_completion, NULL, | |
390 | us->ep_bInterval); | |
391 | result = usb_stor_msg_common(us, 0); | |
392 | ||
393 | return interpret_urb_result(us, pipe, length, result, | |
394 | us->current_urb->actual_length); | |
395 | } | |
396 | ||
397 | /* | |
398 | * Transfer one buffer via bulk pipe, without timeouts, but allowing early | |
399 | * termination. Return codes are USB_STOR_XFER_xxx. If the bulk pipe | |
400 | * stalls during the transfer, the halt is automatically cleared. | |
401 | */ | |
402 | int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe, | |
403 | void *buf, unsigned int length, unsigned int *act_len) | |
404 | { | |
405 | int result; | |
406 | ||
191648d0 | 407 | usb_stor_dbg(us, "xfer %u bytes\n", length); |
1da177e4 LT |
408 | |
409 | /* fill and submit the URB */ | |
410 | usb_fill_bulk_urb(us->current_urb, us->pusb_dev, pipe, buf, length, | |
411 | usb_stor_blocking_completion, NULL); | |
412 | result = usb_stor_msg_common(us, 0); | |
413 | ||
414 | /* store the actual length of the data transferred */ | |
415 | if (act_len) | |
416 | *act_len = us->current_urb->actual_length; | |
417 | return interpret_urb_result(us, pipe, length, result, | |
418 | us->current_urb->actual_length); | |
419 | } | |
e6e244b6 | 420 | EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_buf); |
1da177e4 LT |
421 | |
422 | /* | |
423 | * Transfer a scatter-gather list via bulk transfer | |
424 | * | |
425 | * This function does basically the same thing as usb_stor_bulk_transfer_buf() | |
426 | * above, but it uses the usbcore scatter-gather library. | |
427 | */ | |
428 | static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe, | |
429 | struct scatterlist *sg, int num_sg, unsigned int length, | |
430 | unsigned int *act_len) | |
431 | { | |
432 | int result; | |
433 | ||
543f7810 AS |
434 | /* don't submit s-g requests during abort processing */ |
435 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) | |
1da177e4 LT |
436 | return USB_STOR_XFER_ERROR; |
437 | ||
438 | /* initialize the scatter-gather request block */ | |
191648d0 | 439 | usb_stor_dbg(us, "xfer %u bytes, %d entries\n", length, num_sg); |
1da177e4 | 440 | result = usb_sg_init(&us->current_sg, us->pusb_dev, pipe, 0, |
55acbda0 | 441 | sg, num_sg, length, GFP_NOIO); |
1da177e4 | 442 | if (result) { |
191648d0 | 443 | usb_stor_dbg(us, "usb_sg_init returned %d\n", result); |
1da177e4 LT |
444 | return USB_STOR_XFER_ERROR; |
445 | } | |
446 | ||
f0183a33 FB |
447 | /* |
448 | * since the block has been initialized successfully, it's now | |
449 | * okay to cancel it | |
450 | */ | |
7e4d6c38 | 451 | set_bit(US_FLIDX_SG_ACTIVE, &us->dflags); |
1da177e4 | 452 | |
543f7810 AS |
453 | /* did an abort occur during the submission? */ |
454 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { | |
1da177e4 LT |
455 | |
456 | /* cancel the request, if it hasn't been cancelled already */ | |
7e4d6c38 | 457 | if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { |
191648d0 | 458 | usb_stor_dbg(us, "-- cancelling sg request\n"); |
1da177e4 LT |
459 | usb_sg_cancel(&us->current_sg); |
460 | } | |
461 | } | |
462 | ||
463 | /* wait for the completion of the transfer */ | |
464 | usb_sg_wait(&us->current_sg); | |
7e4d6c38 | 465 | clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags); |
1da177e4 LT |
466 | |
467 | result = us->current_sg.status; | |
468 | if (act_len) | |
469 | *act_len = us->current_sg.bytes; | |
470 | return interpret_urb_result(us, pipe, length, result, | |
471 | us->current_sg.bytes); | |
472 | } | |
473 | ||
6d416e61 BH |
474 | /* |
475 | * Common used function. Transfer a complete command | |
476 | * via usb_stor_bulk_transfer_sglist() above. Set cmnd resid | |
477 | */ | |
478 | int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe, | |
479 | struct scsi_cmnd* srb) | |
480 | { | |
481 | unsigned int partial; | |
482 | int result = usb_stor_bulk_transfer_sglist(us, pipe, scsi_sglist(srb), | |
483 | scsi_sg_count(srb), scsi_bufflen(srb), | |
484 | &partial); | |
485 | ||
486 | scsi_set_resid(srb, scsi_bufflen(srb) - partial); | |
487 | return result; | |
488 | } | |
e6e244b6 | 489 | EXPORT_SYMBOL_GPL(usb_stor_bulk_srb); |
6d416e61 | 490 | |
1da177e4 LT |
491 | /* |
492 | * Transfer an entire SCSI command's worth of data payload over the bulk | |
493 | * pipe. | |
494 | * | |
495 | * Note that this uses usb_stor_bulk_transfer_buf() and | |
496 | * usb_stor_bulk_transfer_sglist() to achieve its goals -- | |
497 | * this function simply determines whether we're going to use | |
498 | * scatter-gather or not, and acts appropriately. | |
499 | */ | |
500 | int usb_stor_bulk_transfer_sg(struct us_data* us, unsigned int pipe, | |
501 | void *buf, unsigned int length_left, int use_sg, int *residual) | |
502 | { | |
503 | int result; | |
504 | unsigned int partial; | |
505 | ||
506 | /* are we scatter-gathering? */ | |
507 | if (use_sg) { | |
508 | /* use the usb core scatter-gather primitives */ | |
509 | result = usb_stor_bulk_transfer_sglist(us, pipe, | |
510 | (struct scatterlist *) buf, use_sg, | |
511 | length_left, &partial); | |
512 | length_left -= partial; | |
513 | } else { | |
514 | /* no scatter-gather, just make the request */ | |
515 | result = usb_stor_bulk_transfer_buf(us, pipe, buf, | |
516 | length_left, &partial); | |
517 | length_left -= partial; | |
518 | } | |
519 | ||
520 | /* store the residual and return the error code */ | |
521 | if (residual) | |
522 | *residual = length_left; | |
523 | return result; | |
524 | } | |
e6e244b6 | 525 | EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_sg); |
1da177e4 LT |
526 | |
527 | /*********************************************************************** | |
528 | * Transport routines | |
529 | ***********************************************************************/ | |
530 | ||
f0183a33 FB |
531 | /* |
532 | * There are so many devices that report the capacity incorrectly, | |
25ff1c31 AS |
533 | * this routine was written to counteract some of the resulting |
534 | * problems. | |
535 | */ | |
536 | static void last_sector_hacks(struct us_data *us, struct scsi_cmnd *srb) | |
537 | { | |
538 | struct gendisk *disk; | |
539 | struct scsi_disk *sdkp; | |
540 | u32 sector; | |
541 | ||
542 | /* To Report "Medium Error: Record Not Found */ | |
543 | static unsigned char record_not_found[18] = { | |
544 | [0] = 0x70, /* current error */ | |
545 | [2] = MEDIUM_ERROR, /* = 0x03 */ | |
546 | [7] = 0x0a, /* additional length */ | |
547 | [12] = 0x14 /* Record Not Found */ | |
548 | }; | |
549 | ||
f0183a33 FB |
550 | /* |
551 | * If last-sector problems can't occur, whether because the | |
25ff1c31 AS |
552 | * capacity was already decremented or because the device is |
553 | * known to report the correct capacity, then we don't need | |
554 | * to do anything. | |
555 | */ | |
556 | if (!us->use_last_sector_hacks) | |
557 | return; | |
558 | ||
559 | /* Was this command a READ(10) or a WRITE(10)? */ | |
560 | if (srb->cmnd[0] != READ_10 && srb->cmnd[0] != WRITE_10) | |
561 | goto done; | |
562 | ||
563 | /* Did this command access the last sector? */ | |
564 | sector = (srb->cmnd[2] << 24) | (srb->cmnd[3] << 16) | | |
565 | (srb->cmnd[4] << 8) | (srb->cmnd[5]); | |
566 | disk = srb->request->rq_disk; | |
567 | if (!disk) | |
568 | goto done; | |
569 | sdkp = scsi_disk(disk); | |
570 | if (!sdkp) | |
571 | goto done; | |
572 | if (sector + 1 != sdkp->capacity) | |
573 | goto done; | |
574 | ||
575 | if (srb->result == SAM_STAT_GOOD && scsi_get_resid(srb) == 0) { | |
576 | ||
f0183a33 FB |
577 | /* |
578 | * The command succeeded. We know this device doesn't | |
0d020aae | 579 | * have the last-sector bug, so stop checking it. |
25ff1c31 | 580 | */ |
0d020aae | 581 | us->use_last_sector_hacks = 0; |
25ff1c31 AS |
582 | |
583 | } else { | |
f0183a33 FB |
584 | /* |
585 | * The command failed. Allow up to 3 retries in case this | |
25ff1c31 AS |
586 | * is some normal sort of failure. After that, assume the |
587 | * capacity is wrong and we're trying to access the sector | |
588 | * beyond the end. Replace the result code and sense data | |
589 | * with values that will cause the SCSI core to fail the | |
590 | * command immediately, instead of going into an infinite | |
591 | * (or even just a very long) retry loop. | |
592 | */ | |
593 | if (++us->last_sector_retries < 3) | |
594 | return; | |
595 | srb->result = SAM_STAT_CHECK_CONDITION; | |
596 | memcpy(srb->sense_buffer, record_not_found, | |
597 | sizeof(record_not_found)); | |
25ff1c31 AS |
598 | } |
599 | ||
600 | done: | |
f0183a33 FB |
601 | /* |
602 | * Don't reset the retry counter for TEST UNIT READY commands, | |
25ff1c31 AS |
603 | * because they get issued after device resets which might be |
604 | * caused by a failed last-sector access. | |
605 | */ | |
606 | if (srb->cmnd[0] != TEST_UNIT_READY) | |
607 | us->last_sector_retries = 0; | |
608 | } | |
609 | ||
f0183a33 FB |
610 | /* |
611 | * Invoke the transport and basic error-handling/recovery methods | |
1da177e4 LT |
612 | * |
613 | * This is used by the protocol layers to actually send the message to | |
614 | * the device and receive the response. | |
615 | */ | |
616 | void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) | |
617 | { | |
618 | int need_auto_sense; | |
619 | int result; | |
620 | ||
621 | /* send the command to the transport layer */ | |
6d416e61 | 622 | scsi_set_resid(srb, 0); |
1da177e4 LT |
623 | result = us->transport(srb, us); |
624 | ||
f0183a33 FB |
625 | /* |
626 | * if the command gets aborted by the higher layers, we need to | |
1da177e4 LT |
627 | * short-circuit all other processing |
628 | */ | |
7e4d6c38 | 629 | if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { |
191648d0 | 630 | usb_stor_dbg(us, "-- command was aborted\n"); |
4d07ef76 MD |
631 | srb->result = DID_ABORT << 16; |
632 | goto Handle_Errors; | |
1da177e4 LT |
633 | } |
634 | ||
635 | /* if there is a transport error, reset and don't auto-sense */ | |
636 | if (result == USB_STOR_TRANSPORT_ERROR) { | |
191648d0 | 637 | usb_stor_dbg(us, "-- transport indicates error, resetting\n"); |
1da177e4 | 638 | srb->result = DID_ERROR << 16; |
4d07ef76 | 639 | goto Handle_Errors; |
1da177e4 LT |
640 | } |
641 | ||
642 | /* if the transport provided its own sense data, don't auto-sense */ | |
643 | if (result == USB_STOR_TRANSPORT_NO_SENSE) { | |
644 | srb->result = SAM_STAT_CHECK_CONDITION; | |
25ff1c31 | 645 | last_sector_hacks(us, srb); |
1da177e4 LT |
646 | return; |
647 | } | |
648 | ||
649 | srb->result = SAM_STAT_GOOD; | |
650 | ||
f0183a33 FB |
651 | /* |
652 | * Determine if we need to auto-sense | |
1da177e4 LT |
653 | * |
654 | * I normally don't use a flag like this, but it's almost impossible | |
655 | * to understand what's going on here if I don't. | |
656 | */ | |
657 | need_auto_sense = 0; | |
658 | ||
659 | /* | |
660 | * If we're running the CB transport, which is incapable | |
661 | * of determining status on its own, we will auto-sense | |
662 | * unless the operation involved a data-in transfer. Devices | |
663 | * can signal most data-in errors by stalling the bulk-in pipe. | |
664 | */ | |
8fa7fd74 | 665 | if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_DPCM_USB) && |
1da177e4 | 666 | srb->sc_data_direction != DMA_FROM_DEVICE) { |
191648d0 | 667 | usb_stor_dbg(us, "-- CB transport device requiring auto-sense\n"); |
1da177e4 LT |
668 | need_auto_sense = 1; |
669 | } | |
670 | ||
671 | /* | |
672 | * If we have a failure, we're going to do a REQUEST_SENSE | |
673 | * automatically. Note that we differentiate between a command | |
674 | * "failure" and an "error" in the transport mechanism. | |
675 | */ | |
676 | if (result == USB_STOR_TRANSPORT_FAILED) { | |
191648d0 | 677 | usb_stor_dbg(us, "-- transport indicates command failure\n"); |
1da177e4 LT |
678 | need_auto_sense = 1; |
679 | } | |
680 | ||
1537e0ad BE |
681 | /* |
682 | * Determine if this device is SAT by seeing if the | |
683 | * command executed successfully. Otherwise we'll have | |
684 | * to wait for at least one CHECK_CONDITION to determine | |
685 | * SANE_SENSE support | |
686 | */ | |
a0bb1081 | 687 | if (unlikely((srb->cmnd[0] == ATA_16 || srb->cmnd[0] == ATA_12) && |
1537e0ad BE |
688 | result == USB_STOR_TRANSPORT_GOOD && |
689 | !(us->fflags & US_FL_SANE_SENSE) && | |
a0bb1081 AS |
690 | !(us->fflags & US_FL_BAD_SENSE) && |
691 | !(srb->cmnd[2] & 0x20))) { | |
191648d0 | 692 | usb_stor_dbg(us, "-- SAT supported, increasing auto-sense\n"); |
1537e0ad BE |
693 | us->fflags |= US_FL_SANE_SENSE; |
694 | } | |
695 | ||
1da177e4 LT |
696 | /* |
697 | * A short transfer on a command where we don't expect it | |
698 | * is unusual, but it doesn't mean we need to auto-sense. | |
699 | */ | |
6d416e61 | 700 | if ((scsi_get_resid(srb) > 0) && |
1da177e4 LT |
701 | !((srb->cmnd[0] == REQUEST_SENSE) || |
702 | (srb->cmnd[0] == INQUIRY) || | |
703 | (srb->cmnd[0] == MODE_SENSE) || | |
704 | (srb->cmnd[0] == LOG_SENSE) || | |
705 | (srb->cmnd[0] == MODE_SENSE_10))) { | |
191648d0 | 706 | usb_stor_dbg(us, "-- unexpectedly short transfer\n"); |
1da177e4 LT |
707 | } |
708 | ||
709 | /* Now, if we need to do the auto-sense, let's do it */ | |
710 | if (need_auto_sense) { | |
711 | int temp_result; | |
dff6de73 | 712 | struct scsi_eh_save ses; |
1537e0ad | 713 | int sense_size = US_SENSE_SIZE; |
e16da02f LT |
714 | struct scsi_sense_hdr sshdr; |
715 | const u8 *scdd; | |
716 | u8 fm_ili; | |
1537e0ad BE |
717 | |
718 | /* device supports and needs bigger sense buffer */ | |
719 | if (us->fflags & US_FL_SANE_SENSE) | |
720 | sense_size = ~0; | |
b8430e1b | 721 | Retry_Sense: |
191648d0 | 722 | usb_stor_dbg(us, "Issuing auto-REQUEST_SENSE\n"); |
1da177e4 | 723 | |
1537e0ad | 724 | scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sense_size); |
1da177e4 LT |
725 | |
726 | /* FIXME: we must do the protocol translation here */ | |
8fa7fd74 MN |
727 | if (us->subclass == USB_SC_RBC || us->subclass == USB_SC_SCSI || |
728 | us->subclass == USB_SC_CYP_ATACB) | |
1da177e4 LT |
729 | srb->cmd_len = 6; |
730 | else | |
731 | srb->cmd_len = 12; | |
732 | ||
1da177e4 | 733 | /* issue the auto-sense command */ |
6d416e61 | 734 | scsi_set_resid(srb, 0); |
1da177e4 LT |
735 | temp_result = us->transport(us->srb, us); |
736 | ||
737 | /* let's clean up right away */ | |
dff6de73 | 738 | scsi_eh_restore_cmnd(srb, &ses); |
1da177e4 | 739 | |
7e4d6c38 | 740 | if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { |
191648d0 | 741 | usb_stor_dbg(us, "-- auto-sense aborted\n"); |
4d07ef76 | 742 | srb->result = DID_ABORT << 16; |
a0bb1081 AS |
743 | |
744 | /* If SANE_SENSE caused this problem, disable it */ | |
745 | if (sense_size != US_SENSE_SIZE) { | |
746 | us->fflags &= ~US_FL_SANE_SENSE; | |
747 | us->fflags |= US_FL_BAD_SENSE; | |
748 | } | |
4d07ef76 | 749 | goto Handle_Errors; |
1da177e4 | 750 | } |
b8430e1b | 751 | |
f0183a33 FB |
752 | /* |
753 | * Some devices claim to support larger sense but fail when | |
b8430e1b BH |
754 | * trying to request it. When a transport failure happens |
755 | * using US_FS_SANE_SENSE, we always retry with a standard | |
756 | * (small) sense request. This fixes some USB GSM modems | |
757 | */ | |
758 | if (temp_result == USB_STOR_TRANSPORT_FAILED && | |
a0bb1081 | 759 | sense_size != US_SENSE_SIZE) { |
191648d0 | 760 | usb_stor_dbg(us, "-- auto-sense failure, retry small sense\n"); |
b8430e1b | 761 | sense_size = US_SENSE_SIZE; |
a0bb1081 AS |
762 | us->fflags &= ~US_FL_SANE_SENSE; |
763 | us->fflags |= US_FL_BAD_SENSE; | |
b8430e1b BH |
764 | goto Retry_Sense; |
765 | } | |
766 | ||
767 | /* Other failures */ | |
1da177e4 | 768 | if (temp_result != USB_STOR_TRANSPORT_GOOD) { |
191648d0 | 769 | usb_stor_dbg(us, "-- auto-sense failure\n"); |
1da177e4 | 770 | |
f0183a33 FB |
771 | /* |
772 | * we skip the reset if this happens to be a | |
1da177e4 LT |
773 | * multi-target device, since failure of an |
774 | * auto-sense is perfectly valid | |
775 | */ | |
1da177e4 | 776 | srb->result = DID_ERROR << 16; |
7e4d6c38 | 777 | if (!(us->fflags & US_FL_SCM_MULT_TARG)) |
4d07ef76 | 778 | goto Handle_Errors; |
1da177e4 LT |
779 | return; |
780 | } | |
781 | ||
f0183a33 FB |
782 | /* |
783 | * If the sense data returned is larger than 18-bytes then we | |
1537e0ad BE |
784 | * assume this device supports requesting more in the future. |
785 | * The response code must be 70h through 73h inclusive. | |
786 | */ | |
787 | if (srb->sense_buffer[7] > (US_SENSE_SIZE - 8) && | |
788 | !(us->fflags & US_FL_SANE_SENSE) && | |
a0bb1081 | 789 | !(us->fflags & US_FL_BAD_SENSE) && |
1537e0ad | 790 | (srb->sense_buffer[0] & 0x7C) == 0x70) { |
191648d0 | 791 | usb_stor_dbg(us, "-- SANE_SENSE support enabled\n"); |
1537e0ad BE |
792 | us->fflags |= US_FL_SANE_SENSE; |
793 | ||
f0183a33 FB |
794 | /* |
795 | * Indicate to the user that we truncated their sense | |
1537e0ad BE |
796 | * because we didn't know it supported larger sense. |
797 | */ | |
191648d0 JP |
798 | usb_stor_dbg(us, "-- Sense data truncated to %i from %i\n", |
799 | US_SENSE_SIZE, | |
800 | srb->sense_buffer[7] + 8); | |
1537e0ad BE |
801 | srb->sense_buffer[7] = (US_SENSE_SIZE - 8); |
802 | } | |
803 | ||
e16da02f LT |
804 | scsi_normalize_sense(srb->sense_buffer, SCSI_SENSE_BUFFERSIZE, |
805 | &sshdr); | |
806 | ||
191648d0 JP |
807 | usb_stor_dbg(us, "-- Result from auto-sense is %d\n", |
808 | temp_result); | |
809 | usb_stor_dbg(us, "-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n", | |
810 | sshdr.response_code, sshdr.sense_key, | |
811 | sshdr.asc, sshdr.ascq); | |
1da177e4 | 812 | #ifdef CONFIG_USB_STORAGE_DEBUG |
191648d0 | 813 | usb_stor_show_sense(us, sshdr.sense_key, sshdr.asc, sshdr.ascq); |
1da177e4 LT |
814 | #endif |
815 | ||
816 | /* set the result so the higher layers expect this data */ | |
817 | srb->result = SAM_STAT_CHECK_CONDITION; | |
818 | ||
e16da02f LT |
819 | scdd = scsi_sense_desc_find(srb->sense_buffer, |
820 | SCSI_SENSE_BUFFERSIZE, 4); | |
821 | fm_ili = (scdd ? scdd[3] : srb->sense_buffer[2]) & 0xA0; | |
822 | ||
f0183a33 FB |
823 | /* |
824 | * We often get empty sense data. This could indicate that | |
f1a0743b AS |
825 | * everything worked or that there was an unspecified |
826 | * problem. We have to decide which. | |
827 | */ | |
e16da02f LT |
828 | if (sshdr.sense_key == 0 && sshdr.asc == 0 && sshdr.ascq == 0 && |
829 | fm_ili == 0) { | |
f0183a33 FB |
830 | /* |
831 | * If things are really okay, then let's show that. | |
f1a0743b AS |
832 | * Zero out the sense buffer so the higher layers |
833 | * won't realize we did an unsolicited auto-sense. | |
834 | */ | |
835 | if (result == USB_STOR_TRANSPORT_GOOD) { | |
836 | srb->result = SAM_STAT_GOOD; | |
837 | srb->sense_buffer[0] = 0x0; | |
a4fd4a72 AS |
838 | } |
839 | ||
840 | /* | |
841 | * ATA-passthru commands use sense data to report | |
842 | * the command completion status, and often devices | |
843 | * return Check Condition status when nothing is | |
844 | * wrong. | |
845 | */ | |
846 | else if (srb->cmnd[0] == ATA_16 || | |
847 | srb->cmnd[0] == ATA_12) { | |
848 | /* leave the data alone */ | |
849 | } | |
f1a0743b | 850 | |
f0183a33 FB |
851 | /* |
852 | * If there was a problem, report an unspecified | |
f1a0743b AS |
853 | * hardware error to prevent the higher layers from |
854 | * entering an infinite retry loop. | |
855 | */ | |
a4fd4a72 | 856 | else { |
f1a0743b | 857 | srb->result = DID_ERROR << 16; |
e16da02f LT |
858 | if ((sshdr.response_code & 0x72) == 0x72) |
859 | srb->sense_buffer[1] = HARDWARE_ERROR; | |
860 | else | |
861 | srb->sense_buffer[2] = HARDWARE_ERROR; | |
f1a0743b | 862 | } |
1da177e4 LT |
863 | } |
864 | } | |
865 | ||
21c13a4f AS |
866 | /* |
867 | * Some devices don't work or return incorrect data the first | |
868 | * time they get a READ(10) command, or for the first READ(10) | |
869 | * after a media change. If the INITIAL_READ10 flag is set, | |
870 | * keep track of whether READ(10) commands succeed. If the | |
871 | * previous one succeeded and this one failed, set the REDO_READ10 | |
872 | * flag to force a retry. | |
873 | */ | |
874 | if (unlikely((us->fflags & US_FL_INITIAL_READ10) && | |
875 | srb->cmnd[0] == READ_10)) { | |
876 | if (srb->result == SAM_STAT_GOOD) { | |
877 | set_bit(US_FLIDX_READ10_WORKED, &us->dflags); | |
878 | } else if (test_bit(US_FLIDX_READ10_WORKED, &us->dflags)) { | |
879 | clear_bit(US_FLIDX_READ10_WORKED, &us->dflags); | |
880 | set_bit(US_FLIDX_REDO_READ10, &us->dflags); | |
881 | } | |
882 | ||
883 | /* | |
884 | * Next, if the REDO_READ10 flag is set, return a result | |
885 | * code that will cause the SCSI core to retry the READ(10) | |
886 | * command immediately. | |
887 | */ | |
888 | if (test_bit(US_FLIDX_REDO_READ10, &us->dflags)) { | |
889 | clear_bit(US_FLIDX_REDO_READ10, &us->dflags); | |
890 | srb->result = DID_IMM_RETRY << 16; | |
891 | srb->sense_buffer[0] = 0; | |
892 | } | |
893 | } | |
894 | ||
1da177e4 | 895 | /* Did we transfer less than the minimum amount required? */ |
8bfa2472 | 896 | if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) && |
6d416e61 | 897 | scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow) |
1c9fbafc | 898 | srb->result = DID_ERROR << 16; |
1da177e4 | 899 | |
25ff1c31 | 900 | last_sector_hacks(us, srb); |
1da177e4 LT |
901 | return; |
902 | ||
f0183a33 FB |
903 | /* |
904 | * Error and abort processing: try to resynchronize with the device | |
4d07ef76 | 905 | * by issuing a port reset. If that fails, try a class-specific |
f0183a33 FB |
906 | * device reset. |
907 | */ | |
4d07ef76 MD |
908 | Handle_Errors: |
909 | ||
f0183a33 FB |
910 | /* |
911 | * Set the RESETTING bit, and clear the ABORTING bit so that | |
912 | * the reset may proceed. | |
913 | */ | |
4d07ef76 | 914 | scsi_lock(us_to_host(us)); |
7e4d6c38 AS |
915 | set_bit(US_FLIDX_RESETTING, &us->dflags); |
916 | clear_bit(US_FLIDX_ABORTING, &us->dflags); | |
4d07ef76 MD |
917 | scsi_unlock(us_to_host(us)); |
918 | ||
f0183a33 FB |
919 | /* |
920 | * We must release the device lock because the pre_reset routine | |
921 | * will want to acquire it. | |
922 | */ | |
47104b0d | 923 | mutex_unlock(&us->dev_mutex); |
4d07ef76 | 924 | result = usb_stor_port_reset(us); |
47104b0d AS |
925 | mutex_lock(&us->dev_mutex); |
926 | ||
4d07ef76 MD |
927 | if (result < 0) { |
928 | scsi_lock(us_to_host(us)); | |
929 | usb_stor_report_device_reset(us); | |
930 | scsi_unlock(us_to_host(us)); | |
1da177e4 | 931 | us->transport_reset(us); |
4d07ef76 | 932 | } |
7e4d6c38 | 933 | clear_bit(US_FLIDX_RESETTING, &us->dflags); |
25ff1c31 | 934 | last_sector_hacks(us, srb); |
1da177e4 LT |
935 | } |
936 | ||
937 | /* Stop the current URB transfer */ | |
938 | void usb_stor_stop_transport(struct us_data *us) | |
939 | { | |
f0183a33 FB |
940 | /* |
941 | * If the state machine is blocked waiting for an URB, | |
1da177e4 LT |
942 | * let's wake it up. The test_and_clear_bit() call |
943 | * guarantees that if a URB has just been submitted, | |
f0183a33 FB |
944 | * it won't be cancelled more than once. |
945 | */ | |
7e4d6c38 | 946 | if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { |
191648d0 | 947 | usb_stor_dbg(us, "-- cancelling URB\n"); |
1da177e4 LT |
948 | usb_unlink_urb(us->current_urb); |
949 | } | |
950 | ||
951 | /* If we are waiting for a scatter-gather operation, cancel it. */ | |
7e4d6c38 | 952 | if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { |
191648d0 | 953 | usb_stor_dbg(us, "-- cancelling sg request\n"); |
1da177e4 LT |
954 | usb_sg_cancel(&us->current_sg); |
955 | } | |
956 | } | |
957 | ||
958 | /* | |
64648a9d | 959 | * Control/Bulk and Control/Bulk/Interrupt transport |
1da177e4 LT |
960 | */ |
961 | ||
64648a9d | 962 | int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us) |
1da177e4 | 963 | { |
6d416e61 | 964 | unsigned int transfer_length = scsi_bufflen(srb); |
1da177e4 LT |
965 | unsigned int pipe = 0; |
966 | int result; | |
967 | ||
968 | /* COMMAND STAGE */ | |
969 | /* let's send the command via the control pipe */ | |
2ce9d227 PV |
970 | /* |
971 | * Command is sometime (f.e. after scsi_eh_prep_cmnd) on the stack. | |
972 | * Stack may be vmallocated. So no DMA for us. Make a copy. | |
973 | */ | |
974 | memcpy(us->iobuf, srb->cmnd, srb->cmd_len); | |
1da177e4 LT |
975 | result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe, |
976 | US_CBI_ADSC, | |
977 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, | |
2ce9d227 | 978 | us->ifnum, us->iobuf, srb->cmd_len); |
1da177e4 LT |
979 | |
980 | /* check the return code for the command */ | |
191648d0 JP |
981 | usb_stor_dbg(us, "Call to usb_stor_ctrl_transfer() returned %d\n", |
982 | result); | |
1da177e4 LT |
983 | |
984 | /* if we stalled the command, it means command failed */ | |
985 | if (result == USB_STOR_XFER_STALLED) { | |
986 | return USB_STOR_TRANSPORT_FAILED; | |
987 | } | |
988 | ||
989 | /* Uh oh... serious problem here */ | |
990 | if (result != USB_STOR_XFER_GOOD) { | |
991 | return USB_STOR_TRANSPORT_ERROR; | |
992 | } | |
993 | ||
994 | /* DATA STAGE */ | |
995 | /* transfer the data payload for this command, if one exists*/ | |
996 | if (transfer_length) { | |
997 | pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? | |
998 | us->recv_bulk_pipe : us->send_bulk_pipe; | |
6d416e61 | 999 | result = usb_stor_bulk_srb(us, pipe, srb); |
191648d0 | 1000 | usb_stor_dbg(us, "CBI data stage result is 0x%x\n", result); |
1da177e4 LT |
1001 | |
1002 | /* if we stalled the data transfer it means command failed */ | |
1003 | if (result == USB_STOR_XFER_STALLED) | |
1004 | return USB_STOR_TRANSPORT_FAILED; | |
1005 | if (result > USB_STOR_XFER_STALLED) | |
1006 | return USB_STOR_TRANSPORT_ERROR; | |
1007 | } | |
1008 | ||
1009 | /* STATUS STAGE */ | |
64648a9d | 1010 | |
f0183a33 FB |
1011 | /* |
1012 | * NOTE: CB does not have a status stage. Silly, I know. So | |
64648a9d AS |
1013 | * we have to catch this at a higher level. |
1014 | */ | |
8fa7fd74 | 1015 | if (us->protocol != USB_PR_CBI) |
64648a9d AS |
1016 | return USB_STOR_TRANSPORT_GOOD; |
1017 | ||
1da177e4 | 1018 | result = usb_stor_intr_transfer(us, us->iobuf, 2); |
191648d0 JP |
1019 | usb_stor_dbg(us, "Got interrupt data (0x%x, 0x%x)\n", |
1020 | us->iobuf[0], us->iobuf[1]); | |
1da177e4 LT |
1021 | if (result != USB_STOR_XFER_GOOD) |
1022 | return USB_STOR_TRANSPORT_ERROR; | |
1023 | ||
f0183a33 FB |
1024 | /* |
1025 | * UFI gives us ASC and ASCQ, like a request sense | |
1da177e4 LT |
1026 | * |
1027 | * REQUEST_SENSE and INQUIRY don't affect the sense data on UFI | |
1028 | * devices, so we ignore the information for those commands. Note | |
1029 | * that this means we could be ignoring a real error on these | |
1030 | * commands, but that can't be helped. | |
1031 | */ | |
8fa7fd74 | 1032 | if (us->subclass == USB_SC_UFI) { |
1da177e4 LT |
1033 | if (srb->cmnd[0] == REQUEST_SENSE || |
1034 | srb->cmnd[0] == INQUIRY) | |
1035 | return USB_STOR_TRANSPORT_GOOD; | |
1036 | if (us->iobuf[0]) | |
1037 | goto Failed; | |
1038 | return USB_STOR_TRANSPORT_GOOD; | |
1039 | } | |
1040 | ||
f0183a33 FB |
1041 | /* |
1042 | * If not UFI, we interpret the data as a result code | |
1da177e4 LT |
1043 | * The first byte should always be a 0x0. |
1044 | * | |
1045 | * Some bogus devices don't follow that rule. They stuff the ASC | |
1046 | * into the first byte -- so if it's non-zero, call it a failure. | |
1047 | */ | |
1048 | if (us->iobuf[0]) { | |
191648d0 JP |
1049 | usb_stor_dbg(us, "CBI IRQ data showed reserved bType 0x%x\n", |
1050 | us->iobuf[0]); | |
1da177e4 LT |
1051 | goto Failed; |
1052 | ||
1053 | } | |
1054 | ||
1055 | /* The second byte & 0x0F should be 0x0 for good, otherwise error */ | |
1056 | switch (us->iobuf[1] & 0x0F) { | |
1057 | case 0x00: | |
1058 | return USB_STOR_TRANSPORT_GOOD; | |
1059 | case 0x01: | |
1060 | goto Failed; | |
1061 | } | |
1062 | return USB_STOR_TRANSPORT_ERROR; | |
1063 | ||
f0183a33 FB |
1064 | /* |
1065 | * the CBI spec requires that the bulk pipe must be cleared | |
1da177e4 LT |
1066 | * following any data-in/out command failure (section 2.4.3.1.3) |
1067 | */ | |
1068 | Failed: | |
1069 | if (pipe) | |
1070 | usb_stor_clear_halt(us, pipe); | |
1071 | return USB_STOR_TRANSPORT_FAILED; | |
1072 | } | |
e6e244b6 | 1073 | EXPORT_SYMBOL_GPL(usb_stor_CB_transport); |
1da177e4 | 1074 | |
1da177e4 LT |
1075 | /* |
1076 | * Bulk only transport | |
1077 | */ | |
1078 | ||
1079 | /* Determine what the maximum LUN supported is */ | |
1080 | int usb_stor_Bulk_max_lun(struct us_data *us) | |
1081 | { | |
1082 | int result; | |
1083 | ||
1084 | /* issue the command */ | |
b876aef7 | 1085 | us->iobuf[0] = 0; |
1da177e4 LT |
1086 | result = usb_stor_control_msg(us, us->recv_ctrl_pipe, |
1087 | US_BULK_GET_MAX_LUN, | |
1088 | USB_DIR_IN | USB_TYPE_CLASS | | |
1089 | USB_RECIP_INTERFACE, | |
7a777919 | 1090 | 0, us->ifnum, us->iobuf, 1, 10*HZ); |
1da177e4 | 1091 | |
191648d0 JP |
1092 | usb_stor_dbg(us, "GetMaxLUN command result is %d, data is %d\n", |
1093 | result, us->iobuf[0]); | |
1da177e4 | 1094 | |
55dc68c0 MK |
1095 | /* |
1096 | * If we have a successful request, return the result if valid. The | |
1097 | * CBW LUN field is 4 bits wide, so the value reported by the device | |
1098 | * should fit into that. | |
1099 | */ | |
1100 | if (result > 0) { | |
1101 | if (us->iobuf[0] < 16) { | |
1102 | return us->iobuf[0]; | |
1103 | } else { | |
1104 | dev_info(&us->pusb_intf->dev, | |
1105 | "Max LUN %d is not valid, using 0 instead", | |
1106 | us->iobuf[0]); | |
1107 | } | |
1108 | } | |
1da177e4 | 1109 | |
1da177e4 LT |
1110 | /* |
1111 | * Some devices don't like GetMaxLUN. They may STALL the control | |
1112 | * pipe, they may return a zero-length result, they may do nothing at | |
1113 | * all and timeout, or they may fail in even more bizarrely creative | |
1114 | * ways. In these cases the best approach is to use the default | |
1115 | * value: only one LUN. | |
1116 | */ | |
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us) | |
1121 | { | |
1122 | struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf; | |
1123 | struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf; | |
6d416e61 | 1124 | unsigned int transfer_length = scsi_bufflen(srb); |
1da177e4 LT |
1125 | unsigned int residue; |
1126 | int result; | |
1127 | int fake_sense = 0; | |
1128 | unsigned int cswlen; | |
1129 | unsigned int cbwlen = US_BULK_CB_WRAP_LEN; | |
1130 | ||
1131 | /* Take care of BULK32 devices; set extra byte to 0 */ | |
7e4d6c38 | 1132 | if (unlikely(us->fflags & US_FL_BULK32)) { |
1da177e4 LT |
1133 | cbwlen = 32; |
1134 | us->iobuf[31] = 0; | |
1135 | } | |
1136 | ||
1137 | /* set up the command wrapper */ | |
1138 | bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); | |
1139 | bcb->DataTransferLength = cpu_to_le32(transfer_length); | |
b8db6d64 SAS |
1140 | bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? |
1141 | US_BULK_FLAG_IN : 0; | |
0f64e078 | 1142 | bcb->Tag = ++us->tag; |
1da177e4 | 1143 | bcb->Lun = srb->device->lun; |
7e4d6c38 | 1144 | if (us->fflags & US_FL_SCM_MULT_TARG) |
1da177e4 LT |
1145 | bcb->Lun |= srb->device->id << 4; |
1146 | bcb->Length = srb->cmd_len; | |
1147 | ||
1148 | /* copy the command payload */ | |
1149 | memset(bcb->CDB, 0, sizeof(bcb->CDB)); | |
1150 | memcpy(bcb->CDB, srb->cmnd, bcb->Length); | |
1151 | ||
1152 | /* send it to out endpoint */ | |
191648d0 JP |
1153 | usb_stor_dbg(us, "Bulk Command S 0x%x T 0x%x L %d F %d Trg %d LUN %d CL %d\n", |
1154 | le32_to_cpu(bcb->Signature), bcb->Tag, | |
1155 | le32_to_cpu(bcb->DataTransferLength), bcb->Flags, | |
1156 | (bcb->Lun >> 4), (bcb->Lun & 0x0F), | |
1157 | bcb->Length); | |
1da177e4 LT |
1158 | result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, |
1159 | bcb, cbwlen, NULL); | |
191648d0 | 1160 | usb_stor_dbg(us, "Bulk command transfer result=%d\n", result); |
1da177e4 LT |
1161 | if (result != USB_STOR_XFER_GOOD) |
1162 | return USB_STOR_TRANSPORT_ERROR; | |
1163 | ||
1164 | /* DATA STAGE */ | |
1165 | /* send/receive data payload, if there is any */ | |
1166 | ||
f0183a33 FB |
1167 | /* |
1168 | * Some USB-IDE converter chips need a 100us delay between the | |
1da177e4 | 1169 | * command phase and the data phase. Some devices need a little |
f0183a33 FB |
1170 | * more than that, probably because of clock rate inaccuracies. |
1171 | */ | |
7e4d6c38 | 1172 | if (unlikely(us->fflags & US_FL_GO_SLOW)) |
e616b39a | 1173 | usleep_range(125, 150); |
1da177e4 LT |
1174 | |
1175 | if (transfer_length) { | |
1176 | unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? | |
1177 | us->recv_bulk_pipe : us->send_bulk_pipe; | |
6d416e61 | 1178 | result = usb_stor_bulk_srb(us, pipe, srb); |
191648d0 | 1179 | usb_stor_dbg(us, "Bulk data transfer result 0x%x\n", result); |
1da177e4 LT |
1180 | if (result == USB_STOR_XFER_ERROR) |
1181 | return USB_STOR_TRANSPORT_ERROR; | |
1182 | ||
f0183a33 FB |
1183 | /* |
1184 | * If the device tried to send back more data than the | |
1da177e4 LT |
1185 | * amount requested, the spec requires us to transfer |
1186 | * the CSW anyway. Since there's no point retrying the | |
1187 | * the command, we'll return fake sense data indicating | |
1188 | * Illegal Request, Invalid Field in CDB. | |
1189 | */ | |
1190 | if (result == USB_STOR_XFER_LONG) | |
1191 | fake_sense = 1; | |
93c9bf4d AS |
1192 | |
1193 | /* | |
1194 | * Sometimes a device will mistakenly skip the data phase | |
1195 | * and go directly to the status phase without sending a | |
1196 | * zero-length packet. If we get a 13-byte response here, | |
1197 | * check whether it really is a CSW. | |
1198 | */ | |
1199 | if (result == USB_STOR_XFER_SHORT && | |
1200 | srb->sc_data_direction == DMA_FROM_DEVICE && | |
1201 | transfer_length - scsi_get_resid(srb) == | |
1202 | US_BULK_CS_WRAP_LEN) { | |
1203 | struct scatterlist *sg = NULL; | |
1204 | unsigned int offset = 0; | |
1205 | ||
1206 | if (usb_stor_access_xfer_buf((unsigned char *) bcs, | |
1207 | US_BULK_CS_WRAP_LEN, srb, &sg, | |
1208 | &offset, FROM_XFER_BUF) == | |
1209 | US_BULK_CS_WRAP_LEN && | |
1210 | bcs->Signature == | |
1211 | cpu_to_le32(US_BULK_CS_SIGN)) { | |
1212 | usb_stor_dbg(us, "Device skipped data phase\n"); | |
1213 | scsi_set_resid(srb, transfer_length); | |
1214 | goto skipped_data_phase; | |
1215 | } | |
1216 | } | |
1da177e4 LT |
1217 | } |
1218 | ||
f0183a33 FB |
1219 | /* |
1220 | * See flow chart on pg 15 of the Bulk Only Transport spec for | |
1da177e4 LT |
1221 | * an explanation of how this code works. |
1222 | */ | |
1223 | ||
1224 | /* get CSW for device status */ | |
191648d0 | 1225 | usb_stor_dbg(us, "Attempting to get CSW...\n"); |
1da177e4 LT |
1226 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, |
1227 | bcs, US_BULK_CS_WRAP_LEN, &cswlen); | |
1228 | ||
f0183a33 FB |
1229 | /* |
1230 | * Some broken devices add unnecessary zero-length packets to the | |
1da177e4 LT |
1231 | * end of their data transfers. Such packets show up as 0-length |
1232 | * CSWs. If we encounter such a thing, try to read the CSW again. | |
1233 | */ | |
1234 | if (result == USB_STOR_XFER_SHORT && cswlen == 0) { | |
191648d0 | 1235 | usb_stor_dbg(us, "Received 0-length CSW; retrying...\n"); |
1da177e4 LT |
1236 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, |
1237 | bcs, US_BULK_CS_WRAP_LEN, &cswlen); | |
1238 | } | |
1239 | ||
1240 | /* did the attempt to read the CSW fail? */ | |
1241 | if (result == USB_STOR_XFER_STALLED) { | |
1242 | ||
1243 | /* get the status again */ | |
191648d0 | 1244 | usb_stor_dbg(us, "Attempting to get CSW (2nd try)...\n"); |
1da177e4 LT |
1245 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, |
1246 | bcs, US_BULK_CS_WRAP_LEN, NULL); | |
1247 | } | |
1248 | ||
1249 | /* if we still have a failure at this point, we're in trouble */ | |
191648d0 | 1250 | usb_stor_dbg(us, "Bulk status result = %d\n", result); |
1da177e4 LT |
1251 | if (result != USB_STOR_XFER_GOOD) |
1252 | return USB_STOR_TRANSPORT_ERROR; | |
1253 | ||
93c9bf4d | 1254 | skipped_data_phase: |
1da177e4 LT |
1255 | /* check bulk status */ |
1256 | residue = le32_to_cpu(bcs->Residue); | |
191648d0 JP |
1257 | usb_stor_dbg(us, "Bulk Status S 0x%x T 0x%x R %u Stat 0x%x\n", |
1258 | le32_to_cpu(bcs->Signature), bcs->Tag, | |
1259 | residue, bcs->Status); | |
7e4d6c38 | 1260 | if (!(bcs->Tag == us->tag || (us->fflags & US_FL_BULK_IGNORE_TAG)) || |
cc36bdd4 | 1261 | bcs->Status > US_BULK_STAT_PHASE) { |
191648d0 | 1262 | usb_stor_dbg(us, "Bulk logical error\n"); |
1da177e4 LT |
1263 | return USB_STOR_TRANSPORT_ERROR; |
1264 | } | |
1265 | ||
f0183a33 FB |
1266 | /* |
1267 | * Some broken devices report odd signatures, so we do not check them | |
1da177e4 LT |
1268 | * for validity against the spec. We store the first one we see, |
1269 | * and check subsequent transfers for validity against this signature. | |
1270 | */ | |
1271 | if (!us->bcs_signature) { | |
1272 | us->bcs_signature = bcs->Signature; | |
1273 | if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN)) | |
191648d0 JP |
1274 | usb_stor_dbg(us, "Learnt BCS signature 0x%08X\n", |
1275 | le32_to_cpu(us->bcs_signature)); | |
1da177e4 | 1276 | } else if (bcs->Signature != us->bcs_signature) { |
191648d0 JP |
1277 | usb_stor_dbg(us, "Signature mismatch: got %08X, expecting %08X\n", |
1278 | le32_to_cpu(bcs->Signature), | |
1279 | le32_to_cpu(us->bcs_signature)); | |
1da177e4 LT |
1280 | return USB_STOR_TRANSPORT_ERROR; |
1281 | } | |
1282 | ||
f0183a33 FB |
1283 | /* |
1284 | * try to compute the actual residue, based on how much data | |
1285 | * was really transferred and what the device tells us | |
1286 | */ | |
59f4ff2e AS |
1287 | if (residue && !(us->fflags & US_FL_IGNORE_RESIDUE)) { |
1288 | ||
f0183a33 FB |
1289 | /* |
1290 | * Heuristically detect devices that generate bogus residues | |
59f4ff2e AS |
1291 | * by seeing what happens with INQUIRY and READ CAPACITY |
1292 | * commands. | |
1293 | */ | |
1294 | if (bcs->Status == US_BULK_STAT_OK && | |
1295 | scsi_get_resid(srb) == 0 && | |
1296 | ((srb->cmnd[0] == INQUIRY && | |
1297 | transfer_length == 36) || | |
1298 | (srb->cmnd[0] == READ_CAPACITY && | |
1299 | transfer_length == 8))) { | |
1300 | us->fflags |= US_FL_IGNORE_RESIDUE; | |
1301 | ||
1302 | } else { | |
1da177e4 | 1303 | residue = min(residue, transfer_length); |
6d416e61 BH |
1304 | scsi_set_resid(srb, max(scsi_get_resid(srb), |
1305 | (int) residue)); | |
1da177e4 LT |
1306 | } |
1307 | } | |
1308 | ||
1309 | /* based on the status code, we report good or bad */ | |
1310 | switch (bcs->Status) { | |
1311 | case US_BULK_STAT_OK: | |
1312 | /* device babbled -- return fake sense data */ | |
1313 | if (fake_sense) { | |
1314 | memcpy(srb->sense_buffer, | |
1315 | usb_stor_sense_invalidCDB, | |
1316 | sizeof(usb_stor_sense_invalidCDB)); | |
1317 | return USB_STOR_TRANSPORT_NO_SENSE; | |
1318 | } | |
1319 | ||
1320 | /* command good -- note that data could be short */ | |
1321 | return USB_STOR_TRANSPORT_GOOD; | |
1322 | ||
1323 | case US_BULK_STAT_FAIL: | |
1324 | /* command failed */ | |
1325 | return USB_STOR_TRANSPORT_FAILED; | |
1326 | ||
1327 | case US_BULK_STAT_PHASE: | |
f0183a33 FB |
1328 | /* |
1329 | * phase error -- note that a transport reset will be | |
1da177e4 LT |
1330 | * invoked by the invoke_transport() function |
1331 | */ | |
1332 | return USB_STOR_TRANSPORT_ERROR; | |
1333 | } | |
1334 | ||
1335 | /* we should never get here, but if we do, we're in trouble */ | |
1336 | return USB_STOR_TRANSPORT_ERROR; | |
1337 | } | |
e6e244b6 | 1338 | EXPORT_SYMBOL_GPL(usb_stor_Bulk_transport); |
1da177e4 LT |
1339 | |
1340 | /*********************************************************************** | |
1341 | * Reset routines | |
1342 | ***********************************************************************/ | |
1343 | ||
f0183a33 FB |
1344 | /* |
1345 | * This is the common part of the device reset code. | |
1da177e4 LT |
1346 | * |
1347 | * It's handy that every transport mechanism uses the control endpoint for | |
1348 | * resets. | |
1349 | * | |
5203ad44 | 1350 | * Basically, we send a reset with a 5-second timeout, so we don't get |
1da177e4 LT |
1351 | * jammed attempting to do the reset. |
1352 | */ | |
1353 | static int usb_stor_reset_common(struct us_data *us, | |
1354 | u8 request, u8 requesttype, | |
1355 | u16 value, u16 index, void *data, u16 size) | |
1356 | { | |
1357 | int result; | |
1358 | int result2; | |
1da177e4 | 1359 | |
7e4d6c38 | 1360 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
191648d0 | 1361 | usb_stor_dbg(us, "No reset during disconnect\n"); |
4d07ef76 MD |
1362 | return -EIO; |
1363 | } | |
1da177e4 | 1364 | |
1da177e4 LT |
1365 | result = usb_stor_control_msg(us, us->send_ctrl_pipe, |
1366 | request, requesttype, value, index, data, size, | |
5203ad44 | 1367 | 5*HZ); |
1da177e4 | 1368 | if (result < 0) { |
191648d0 | 1369 | usb_stor_dbg(us, "Soft reset failed: %d\n", result); |
4d07ef76 | 1370 | return result; |
1da177e4 LT |
1371 | } |
1372 | ||
f0183a33 FB |
1373 | /* |
1374 | * Give the device some time to recover from the reset, | |
1375 | * but don't delay disconnect processing. | |
1376 | */ | |
7e4d6c38 AS |
1377 | wait_event_interruptible_timeout(us->delay_wait, |
1378 | test_bit(US_FLIDX_DISCONNECTING, &us->dflags), | |
1379 | HZ*6); | |
1380 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { | |
191648d0 | 1381 | usb_stor_dbg(us, "Reset interrupted by disconnect\n"); |
4d07ef76 | 1382 | return -EIO; |
1da177e4 LT |
1383 | } |
1384 | ||
191648d0 | 1385 | usb_stor_dbg(us, "Soft reset: clearing bulk-in endpoint halt\n"); |
1da177e4 LT |
1386 | result = usb_stor_clear_halt(us, us->recv_bulk_pipe); |
1387 | ||
191648d0 | 1388 | usb_stor_dbg(us, "Soft reset: clearing bulk-out endpoint halt\n"); |
1da177e4 LT |
1389 | result2 = usb_stor_clear_halt(us, us->send_bulk_pipe); |
1390 | ||
5203ad44 MD |
1391 | /* return a result code based on the result of the clear-halts */ |
1392 | if (result >= 0) | |
1393 | result = result2; | |
4d07ef76 | 1394 | if (result < 0) |
191648d0 | 1395 | usb_stor_dbg(us, "Soft reset failed\n"); |
4d07ef76 | 1396 | else |
191648d0 | 1397 | usb_stor_dbg(us, "Soft reset done\n"); |
4d07ef76 | 1398 | return result; |
1da177e4 LT |
1399 | } |
1400 | ||
f0183a33 | 1401 | /* This issues a CB[I] Reset to the device in question */ |
1da177e4 LT |
1402 | #define CB_RESET_CMD_SIZE 12 |
1403 | ||
1404 | int usb_stor_CB_reset(struct us_data *us) | |
1405 | { | |
1da177e4 LT |
1406 | memset(us->iobuf, 0xFF, CB_RESET_CMD_SIZE); |
1407 | us->iobuf[0] = SEND_DIAGNOSTIC; | |
1408 | us->iobuf[1] = 4; | |
1409 | return usb_stor_reset_common(us, US_CBI_ADSC, | |
1410 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
1411 | 0, us->ifnum, us->iobuf, CB_RESET_CMD_SIZE); | |
1412 | } | |
e6e244b6 | 1413 | EXPORT_SYMBOL_GPL(usb_stor_CB_reset); |
1da177e4 | 1414 | |
f0183a33 FB |
1415 | /* |
1416 | * This issues a Bulk-only Reset to the device in question, including | |
1da177e4 LT |
1417 | * clearing the subsequent endpoint halts that may occur. |
1418 | */ | |
1419 | int usb_stor_Bulk_reset(struct us_data *us) | |
1420 | { | |
1da177e4 LT |
1421 | return usb_stor_reset_common(us, US_BULK_RESET_REQUEST, |
1422 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
1423 | 0, us->ifnum, NULL, 0); | |
1424 | } | |
e6e244b6 | 1425 | EXPORT_SYMBOL_GPL(usb_stor_Bulk_reset); |
4d07ef76 | 1426 | |
f0183a33 FB |
1427 | /* |
1428 | * Issue a USB port reset to the device. The caller must not hold | |
47104b0d AS |
1429 | * us->dev_mutex. |
1430 | */ | |
4d07ef76 MD |
1431 | int usb_stor_port_reset(struct us_data *us) |
1432 | { | |
011b15df | 1433 | int result; |
4d07ef76 | 1434 | |
5d398779 | 1435 | /*for these devices we must use the class specific method */ |
7fda953f | 1436 | if (us->pusb_dev->quirks & USB_QUIRK_RESET) |
5d398779 ON |
1437 | return -EPERM; |
1438 | ||
011b15df | 1439 | result = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf); |
47104b0d | 1440 | if (result < 0) |
191648d0 JP |
1441 | usb_stor_dbg(us, "unable to lock device for reset: %d\n", |
1442 | result); | |
47104b0d AS |
1443 | else { |
1444 | /* Were we disconnected while waiting for the lock? */ | |
7e4d6c38 | 1445 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
47104b0d | 1446 | result = -EIO; |
191648d0 | 1447 | usb_stor_dbg(us, "No reset during disconnect\n"); |
4d07ef76 | 1448 | } else { |
742120c6 | 1449 | result = usb_reset_device(us->pusb_dev); |
191648d0 JP |
1450 | usb_stor_dbg(us, "usb_reset_device returns %d\n", |
1451 | result); | |
4d07ef76 | 1452 | } |
011b15df | 1453 | usb_unlock_device(us->pusb_dev); |
4d07ef76 MD |
1454 | } |
1455 | return result; | |
1456 | } |