Commit | Line | Data |
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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. | |
1da177e4 LT |
29 | */ |
30 | ||
1da177e4 | 31 | #include <linux/sched.h> |
5a0e3ad6 | 32 | #include <linux/gfp.h> |
1da177e4 | 33 | #include <linux/errno.h> |
f940fcd8 | 34 | #include <linux/export.h> |
1da177e4 | 35 | |
5d398779 ON |
36 | #include <linux/usb/quirks.h> |
37 | ||
1da177e4 | 38 | #include <scsi/scsi.h> |
dff6de73 | 39 | #include <scsi/scsi_eh.h> |
1da177e4 LT |
40 | #include <scsi/scsi_device.h> |
41 | ||
42 | #include "usb.h" | |
43 | #include "transport.h" | |
44 | #include "protocol.h" | |
45 | #include "scsiglue.h" | |
46 | #include "debug.h" | |
47 | ||
25ff1c31 AS |
48 | #include <linux/blkdev.h> |
49 | #include "../../scsi/sd.h" | |
50 | ||
1da177e4 LT |
51 | |
52 | /*********************************************************************** | |
53 | * Data transfer routines | |
54 | ***********************************************************************/ | |
55 | ||
56 | /* | |
57 | * This is subtle, so pay attention: | |
58 | * --------------------------------- | |
59 | * We're very concerned about races with a command abort. Hanging this code | |
60 | * is a sure fire way to hang the kernel. (Note that this discussion applies | |
61 | * only to transactions resulting from a scsi queued-command, since only | |
62 | * these transactions are subject to a scsi abort. Other transactions, such | |
63 | * as those occurring during device-specific initialization, must be handled | |
64 | * by a separate code path.) | |
65 | * | |
66 | * The abort function (usb_storage_command_abort() in scsiglue.c) first | |
7e4d6c38 | 67 | * sets the machine state and the ABORTING bit in us->dflags to prevent |
1da177e4 | 68 | * new URBs from being submitted. It then calls usb_stor_stop_transport() |
7e4d6c38 | 69 | * below, which atomically tests-and-clears the URB_ACTIVE bit in us->dflags |
1da177e4 LT |
70 | * to see if the current_urb needs to be stopped. Likewise, the SG_ACTIVE |
71 | * bit is tested to see if the current_sg scatter-gather request needs to be | |
72 | * stopped. The timeout callback routine does much the same thing. | |
73 | * | |
7e4d6c38 | 74 | * When a disconnect occurs, the DISCONNECTING bit in us->dflags is set to |
1da177e4 LT |
75 | * prevent new URBs from being submitted, and usb_stor_stop_transport() is |
76 | * called to stop any ongoing requests. | |
77 | * | |
78 | * The submit function first verifies that the submitting is allowed | |
79 | * (neither ABORTING nor DISCONNECTING bits are set) and that the submit | |
80 | * completes without errors, and only then sets the URB_ACTIVE bit. This | |
81 | * prevents the stop_transport() function from trying to cancel the URB | |
82 | * while the submit call is underway. Next, the submit function must test | |
83 | * the flags to see if an abort or disconnect occurred during the submission | |
84 | * or before the URB_ACTIVE bit was set. If so, it's essential to cancel | |
85 | * the URB if it hasn't been cancelled already (i.e., if the URB_ACTIVE bit | |
86 | * is still set). Either way, the function must then wait for the URB to | |
b375a049 AS |
87 | * finish. Note that the URB can still be in progress even after a call to |
88 | * usb_unlink_urb() returns. | |
1da177e4 LT |
89 | * |
90 | * The idea is that (1) once the ABORTING or DISCONNECTING bit is set, | |
91 | * either the stop_transport() function or the submitting function | |
92 | * is guaranteed to call usb_unlink_urb() for an active URB, | |
93 | * and (2) test_and_clear_bit() prevents usb_unlink_urb() from being | |
94 | * called more than once or from being called during usb_submit_urb(). | |
95 | */ | |
96 | ||
f0183a33 FB |
97 | /* |
98 | * This is the completion handler which will wake us up when an URB | |
1da177e4 LT |
99 | * completes. |
100 | */ | |
7d12e780 | 101 | static void usb_stor_blocking_completion(struct urb *urb) |
1da177e4 | 102 | { |
cdc97792 | 103 | struct completion *urb_done_ptr = urb->context; |
1da177e4 LT |
104 | |
105 | complete(urb_done_ptr); | |
106 | } | |
1da177e4 | 107 | |
f0183a33 FB |
108 | /* |
109 | * This is the common part of the URB message submission code | |
1da177e4 LT |
110 | * |
111 | * All URBs from the usb-storage driver involved in handling a queued scsi | |
112 | * command _must_ pass through this function (or something like it) for the | |
113 | * abort mechanisms to work properly. | |
114 | */ | |
115 | static int usb_stor_msg_common(struct us_data *us, int timeout) | |
116 | { | |
117 | struct completion urb_done; | |
3428cc43 | 118 | long timeleft; |
1da177e4 LT |
119 | int status; |
120 | ||
543f7810 AS |
121 | /* don't submit URBs during abort processing */ |
122 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) | |
1da177e4 LT |
123 | return -EIO; |
124 | ||
125 | /* set up data structures for the wakeup system */ | |
126 | init_completion(&urb_done); | |
127 | ||
128 | /* fill the common fields in the URB */ | |
129 | us->current_urb->context = &urb_done; | |
c222fb2e | 130 | us->current_urb->transfer_flags = 0; |
1da177e4 | 131 | |
f0183a33 FB |
132 | /* |
133 | * we assume that if transfer_buffer isn't us->iobuf then it | |
1da177e4 LT |
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 | |
f0183a33 FB |
136 | * transfer buffer has already been mapped. |
137 | */ | |
1da177e4 LT |
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; | |
1da177e4 LT |
141 | |
142 | /* submit the URB */ | |
143 | status = usb_submit_urb(us->current_urb, GFP_NOIO); | |
144 | if (status) { | |
145 | /* something went wrong */ | |
146 | return status; | |
147 | } | |
148 | ||
f0183a33 FB |
149 | /* |
150 | * since the URB has been submitted successfully, it's now okay | |
151 | * to cancel it | |
152 | */ | |
7e4d6c38 | 153 | set_bit(US_FLIDX_URB_ACTIVE, &us->dflags); |
1da177e4 | 154 | |
543f7810 AS |
155 | /* did an abort occur during the submission? */ |
156 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { | |
1da177e4 LT |
157 | |
158 | /* cancel the URB, if it hasn't been cancelled already */ | |
7e4d6c38 | 159 | if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { |
191648d0 | 160 | usb_stor_dbg(us, "-- cancelling URB\n"); |
1da177e4 LT |
161 | usb_unlink_urb(us->current_urb); |
162 | } | |
163 | } | |
164 | ||
1da177e4 | 165 | /* wait for the completion of the URB */ |
3428cc43 FBH |
166 | timeleft = wait_for_completion_interruptible_timeout( |
167 | &urb_done, timeout ? : MAX_SCHEDULE_TIMEOUT); | |
1da177e4 | 168 | |
7e4d6c38 | 169 | clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags); |
3428cc43 FBH |
170 | |
171 | if (timeleft <= 0) { | |
191648d0 JP |
172 | usb_stor_dbg(us, "%s -- cancelling URB\n", |
173 | timeleft == 0 ? "Timeout" : "Signal"); | |
d6b7d3b6 | 174 | usb_kill_urb(us->current_urb); |
3428cc43 | 175 | } |
1da177e4 LT |
176 | |
177 | /* return the URB status */ | |
178 | return us->current_urb->status; | |
179 | } | |
180 | ||
181 | /* | |
182 | * Transfer one control message, with timeouts, and allowing early | |
183 | * termination. Return codes are usual -Exxx, *not* USB_STOR_XFER_xxx. | |
184 | */ | |
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) | |
188 | { | |
189 | int status; | |
190 | ||
191648d0 JP |
191 | usb_stor_dbg(us, "rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", |
192 | request, requesttype, value, index, size); | |
1da177e4 LT |
193 | |
194 | /* fill in the devrequest structure */ | |
195 | us->cr->bRequestType = requesttype; | |
196 | us->cr->bRequest = request; | |
197 | us->cr->wValue = cpu_to_le16(value); | |
198 | us->cr->wIndex = cpu_to_le16(index); | |
199 | us->cr->wLength = cpu_to_le16(size); | |
200 | ||
201 | /* fill and submit the URB */ | |
202 | usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, | |
203 | (unsigned char*) us->cr, data, size, | |
204 | usb_stor_blocking_completion, NULL); | |
205 | status = usb_stor_msg_common(us, timeout); | |
206 | ||
207 | /* return the actual length of the data transferred if no error */ | |
208 | if (status == 0) | |
209 | status = us->current_urb->actual_length; | |
210 | return status; | |
211 | } | |
e6e244b6 | 212 | EXPORT_SYMBOL_GPL(usb_stor_control_msg); |
1da177e4 | 213 | |
f0183a33 FB |
214 | /* |
215 | * This is a version of usb_clear_halt() that allows early termination and | |
1da177e4 LT |
216 | * doesn't read the status from the device -- this is because some devices |
217 | * crash their internal firmware when the status is requested after a halt. | |
218 | * | |
219 | * A definitive list of these 'bad' devices is too difficult to maintain or | |
220 | * make complete enough to be useful. This problem was first observed on the | |
221 | * Hagiwara FlashGate DUAL unit. However, bus traces reveal that neither | |
222 | * MacOS nor Windows checks the status after clearing a halt. | |
223 | * | |
224 | * Since many vendors in this space limit their testing to interoperability | |
225 | * with these two OSes, specification violations like this one are common. | |
226 | */ | |
227 | int usb_stor_clear_halt(struct us_data *us, unsigned int pipe) | |
228 | { | |
229 | int result; | |
230 | int endp = usb_pipeendpoint(pipe); | |
231 | ||
232 | if (usb_pipein (pipe)) | |
233 | endp |= USB_DIR_IN; | |
234 | ||
235 | result = usb_stor_control_msg(us, us->send_ctrl_pipe, | |
236 | USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT, | |
237 | USB_ENDPOINT_HALT, endp, | |
238 | NULL, 0, 3*HZ); | |
239 | ||
5203ad44 | 240 | if (result >= 0) |
3444b26a | 241 | usb_reset_endpoint(us->pusb_dev, endp); |
1da177e4 | 242 | |
191648d0 | 243 | usb_stor_dbg(us, "result = %d\n", result); |
1da177e4 LT |
244 | return result; |
245 | } | |
e6e244b6 | 246 | EXPORT_SYMBOL_GPL(usb_stor_clear_halt); |
1da177e4 LT |
247 | |
248 | ||
249 | /* | |
250 | * Interpret the results of a URB transfer | |
251 | * | |
252 | * This function prints appropriate debugging messages, clears halts on | |
253 | * non-control endpoints, and translates the status to the corresponding | |
254 | * USB_STOR_XFER_xxx return code. | |
255 | */ | |
256 | static int interpret_urb_result(struct us_data *us, unsigned int pipe, | |
257 | unsigned int length, int result, unsigned int partial) | |
258 | { | |
191648d0 JP |
259 | usb_stor_dbg(us, "Status code %d; transferred %u/%u\n", |
260 | result, partial, length); | |
1da177e4 LT |
261 | switch (result) { |
262 | ||
263 | /* no error code; did we send all the data? */ | |
264 | case 0: | |
265 | if (partial != length) { | |
191648d0 | 266 | usb_stor_dbg(us, "-- short transfer\n"); |
1da177e4 LT |
267 | return USB_STOR_XFER_SHORT; |
268 | } | |
269 | ||
191648d0 | 270 | usb_stor_dbg(us, "-- transfer complete\n"); |
1da177e4 LT |
271 | return USB_STOR_XFER_GOOD; |
272 | ||
273 | /* stalled */ | |
274 | case -EPIPE: | |
f0183a33 FB |
275 | /* |
276 | * for control endpoints, (used by CB[I]) a stall indicates | |
277 | * a failed command | |
278 | */ | |
1da177e4 | 279 | if (usb_pipecontrol(pipe)) { |
191648d0 | 280 | usb_stor_dbg(us, "-- stall on control pipe\n"); |
1da177e4 LT |
281 | return USB_STOR_XFER_STALLED; |
282 | } | |
283 | ||
284 | /* for other sorts of endpoint, clear the stall */ | |
191648d0 JP |
285 | usb_stor_dbg(us, "clearing endpoint halt for pipe 0x%x\n", |
286 | pipe); | |
1da177e4 LT |
287 | if (usb_stor_clear_halt(us, pipe) < 0) |
288 | return USB_STOR_XFER_ERROR; | |
289 | return USB_STOR_XFER_STALLED; | |
290 | ||
1da177e4 LT |
291 | /* babble - the device tried to send more than we wanted to read */ |
292 | case -EOVERFLOW: | |
191648d0 | 293 | usb_stor_dbg(us, "-- babble\n"); |
1da177e4 LT |
294 | return USB_STOR_XFER_LONG; |
295 | ||
296 | /* the transfer was cancelled by abort, disconnect, or timeout */ | |
297 | case -ECONNRESET: | |
191648d0 | 298 | usb_stor_dbg(us, "-- transfer cancelled\n"); |
1da177e4 LT |
299 | return USB_STOR_XFER_ERROR; |
300 | ||
301 | /* short scatter-gather read transfer */ | |
302 | case -EREMOTEIO: | |
191648d0 | 303 | usb_stor_dbg(us, "-- short read transfer\n"); |
1da177e4 LT |
304 | return USB_STOR_XFER_SHORT; |
305 | ||
306 | /* abort or disconnect in progress */ | |
307 | case -EIO: | |
191648d0 | 308 | usb_stor_dbg(us, "-- abort or disconnect in progress\n"); |
1da177e4 LT |
309 | return USB_STOR_XFER_ERROR; |
310 | ||
311 | /* the catch-all error case */ | |
312 | default: | |
191648d0 | 313 | usb_stor_dbg(us, "-- unknown error\n"); |
1da177e4 LT |
314 | return USB_STOR_XFER_ERROR; |
315 | } | |
316 | } | |
317 | ||
318 | /* | |
319 | * Transfer one control message, without timeouts, but allowing early | |
320 | * termination. Return codes are USB_STOR_XFER_xxx. | |
321 | */ | |
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) | |
325 | { | |
326 | int result; | |
327 | ||
191648d0 JP |
328 | usb_stor_dbg(us, "rq=%02x rqtype=%02x value=%04x index=%02x len=%u\n", |
329 | request, requesttype, value, index, size); | |
1da177e4 LT |
330 | |
331 | /* fill in the devrequest structure */ | |
332 | us->cr->bRequestType = requesttype; | |
333 | us->cr->bRequest = request; | |
334 | us->cr->wValue = cpu_to_le16(value); | |
335 | us->cr->wIndex = cpu_to_le16(index); | |
336 | us->cr->wLength = cpu_to_le16(size); | |
337 | ||
338 | /* fill and submit the URB */ | |
339 | usb_fill_control_urb(us->current_urb, us->pusb_dev, pipe, | |
340 | (unsigned char*) us->cr, data, size, | |
341 | usb_stor_blocking_completion, NULL); | |
342 | result = usb_stor_msg_common(us, 0); | |
343 | ||
344 | return interpret_urb_result(us, pipe, size, result, | |
345 | us->current_urb->actual_length); | |
346 | } | |
e6e244b6 | 347 | EXPORT_SYMBOL_GPL(usb_stor_ctrl_transfer); |
1da177e4 LT |
348 | |
349 | /* | |
350 | * Receive one interrupt buffer, without timeouts, but allowing early | |
351 | * termination. Return codes are USB_STOR_XFER_xxx. | |
352 | * | |
353 | * This routine always uses us->recv_intr_pipe as the pipe and | |
354 | * us->ep_bInterval as the interrupt interval. | |
355 | */ | |
356 | static int usb_stor_intr_transfer(struct us_data *us, void *buf, | |
357 | unsigned int length) | |
358 | { | |
359 | int result; | |
360 | unsigned int pipe = us->recv_intr_pipe; | |
361 | unsigned int maxp; | |
362 | ||
191648d0 | 363 | usb_stor_dbg(us, "xfer %u bytes\n", length); |
1da177e4 LT |
364 | |
365 | /* calculate the max packet size */ | |
366 | maxp = usb_maxpacket(us->pusb_dev, pipe, usb_pipeout(pipe)); | |
367 | if (maxp > length) | |
368 | maxp = length; | |
369 | ||
370 | /* fill and submit the URB */ | |
371 | usb_fill_int_urb(us->current_urb, us->pusb_dev, pipe, buf, | |
372 | maxp, usb_stor_blocking_completion, NULL, | |
373 | us->ep_bInterval); | |
374 | result = usb_stor_msg_common(us, 0); | |
375 | ||
376 | return interpret_urb_result(us, pipe, length, result, | |
377 | us->current_urb->actual_length); | |
378 | } | |
379 | ||
380 | /* | |
381 | * Transfer one buffer via bulk pipe, without timeouts, but allowing early | |
382 | * termination. Return codes are USB_STOR_XFER_xxx. If the bulk pipe | |
383 | * stalls during the transfer, the halt is automatically cleared. | |
384 | */ | |
385 | int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe, | |
386 | void *buf, unsigned int length, unsigned int *act_len) | |
387 | { | |
388 | int result; | |
389 | ||
191648d0 | 390 | usb_stor_dbg(us, "xfer %u bytes\n", length); |
1da177e4 LT |
391 | |
392 | /* fill and submit the URB */ | |
393 | usb_fill_bulk_urb(us->current_urb, us->pusb_dev, pipe, buf, length, | |
394 | usb_stor_blocking_completion, NULL); | |
395 | result = usb_stor_msg_common(us, 0); | |
396 | ||
397 | /* store the actual length of the data transferred */ | |
398 | if (act_len) | |
399 | *act_len = us->current_urb->actual_length; | |
400 | return interpret_urb_result(us, pipe, length, result, | |
401 | us->current_urb->actual_length); | |
402 | } | |
e6e244b6 | 403 | EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_buf); |
1da177e4 LT |
404 | |
405 | /* | |
406 | * Transfer a scatter-gather list via bulk transfer | |
407 | * | |
408 | * This function does basically the same thing as usb_stor_bulk_transfer_buf() | |
409 | * above, but it uses the usbcore scatter-gather library. | |
410 | */ | |
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) | |
414 | { | |
415 | int result; | |
416 | ||
543f7810 AS |
417 | /* don't submit s-g requests during abort processing */ |
418 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) | |
1da177e4 LT |
419 | return USB_STOR_XFER_ERROR; |
420 | ||
421 | /* initialize the scatter-gather request block */ | |
191648d0 | 422 | usb_stor_dbg(us, "xfer %u bytes, %d entries\n", length, num_sg); |
1da177e4 | 423 | result = usb_sg_init(&us->current_sg, us->pusb_dev, pipe, 0, |
55acbda0 | 424 | sg, num_sg, length, GFP_NOIO); |
1da177e4 | 425 | if (result) { |
191648d0 | 426 | usb_stor_dbg(us, "usb_sg_init returned %d\n", result); |
1da177e4 LT |
427 | return USB_STOR_XFER_ERROR; |
428 | } | |
429 | ||
f0183a33 FB |
430 | /* |
431 | * since the block has been initialized successfully, it's now | |
432 | * okay to cancel it | |
433 | */ | |
7e4d6c38 | 434 | set_bit(US_FLIDX_SG_ACTIVE, &us->dflags); |
1da177e4 | 435 | |
543f7810 AS |
436 | /* did an abort occur during the submission? */ |
437 | if (test_bit(US_FLIDX_ABORTING, &us->dflags)) { | |
1da177e4 LT |
438 | |
439 | /* cancel the request, if it hasn't been cancelled already */ | |
7e4d6c38 | 440 | if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { |
191648d0 | 441 | usb_stor_dbg(us, "-- cancelling sg request\n"); |
1da177e4 LT |
442 | usb_sg_cancel(&us->current_sg); |
443 | } | |
444 | } | |
445 | ||
446 | /* wait for the completion of the transfer */ | |
447 | usb_sg_wait(&us->current_sg); | |
7e4d6c38 | 448 | clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags); |
1da177e4 LT |
449 | |
450 | result = us->current_sg.status; | |
451 | if (act_len) | |
452 | *act_len = us->current_sg.bytes; | |
453 | return interpret_urb_result(us, pipe, length, result, | |
454 | us->current_sg.bytes); | |
455 | } | |
456 | ||
6d416e61 BH |
457 | /* |
458 | * Common used function. Transfer a complete command | |
459 | * via usb_stor_bulk_transfer_sglist() above. Set cmnd resid | |
460 | */ | |
461 | int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe, | |
462 | struct scsi_cmnd* srb) | |
463 | { | |
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), | |
467 | &partial); | |
468 | ||
469 | scsi_set_resid(srb, scsi_bufflen(srb) - partial); | |
470 | return result; | |
471 | } | |
e6e244b6 | 472 | EXPORT_SYMBOL_GPL(usb_stor_bulk_srb); |
6d416e61 | 473 | |
1da177e4 LT |
474 | /* |
475 | * Transfer an entire SCSI command's worth of data payload over the bulk | |
476 | * pipe. | |
477 | * | |
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. | |
482 | */ | |
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) | |
485 | { | |
486 | int result; | |
487 | unsigned int partial; | |
488 | ||
489 | /* are we scatter-gathering? */ | |
490 | if (use_sg) { | |
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; | |
496 | } else { | |
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; | |
501 | } | |
502 | ||
503 | /* store the residual and return the error code */ | |
504 | if (residual) | |
505 | *residual = length_left; | |
506 | return result; | |
507 | } | |
e6e244b6 | 508 | EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_sg); |
1da177e4 LT |
509 | |
510 | /*********************************************************************** | |
511 | * Transport routines | |
512 | ***********************************************************************/ | |
513 | ||
f0183a33 FB |
514 | /* |
515 | * There are so many devices that report the capacity incorrectly, | |
25ff1c31 AS |
516 | * this routine was written to counteract some of the resulting |
517 | * problems. | |
518 | */ | |
519 | static void last_sector_hacks(struct us_data *us, struct scsi_cmnd *srb) | |
520 | { | |
521 | struct gendisk *disk; | |
522 | struct scsi_disk *sdkp; | |
523 | u32 sector; | |
524 | ||
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 */ | |
531 | }; | |
532 | ||
f0183a33 FB |
533 | /* |
534 | * If last-sector problems can't occur, whether because the | |
25ff1c31 AS |
535 | * capacity was already decremented or because the device is |
536 | * known to report the correct capacity, then we don't need | |
537 | * to do anything. | |
538 | */ | |
539 | if (!us->use_last_sector_hacks) | |
540 | return; | |
541 | ||
542 | /* Was this command a READ(10) or a WRITE(10)? */ | |
543 | if (srb->cmnd[0] != READ_10 && srb->cmnd[0] != WRITE_10) | |
544 | goto done; | |
545 | ||
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; | |
550 | if (!disk) | |
551 | goto done; | |
552 | sdkp = scsi_disk(disk); | |
553 | if (!sdkp) | |
554 | goto done; | |
555 | if (sector + 1 != sdkp->capacity) | |
556 | goto done; | |
557 | ||
558 | if (srb->result == SAM_STAT_GOOD && scsi_get_resid(srb) == 0) { | |
559 | ||
f0183a33 FB |
560 | /* |
561 | * The command succeeded. We know this device doesn't | |
0d020aae | 562 | * have the last-sector bug, so stop checking it. |
25ff1c31 | 563 | */ |
0d020aae | 564 | us->use_last_sector_hacks = 0; |
25ff1c31 AS |
565 | |
566 | } else { | |
f0183a33 FB |
567 | /* |
568 | * The command failed. Allow up to 3 retries in case this | |
25ff1c31 AS |
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. | |
575 | */ | |
576 | if (++us->last_sector_retries < 3) | |
577 | return; | |
578 | srb->result = SAM_STAT_CHECK_CONDITION; | |
579 | memcpy(srb->sense_buffer, record_not_found, | |
580 | sizeof(record_not_found)); | |
25ff1c31 AS |
581 | } |
582 | ||
583 | done: | |
f0183a33 FB |
584 | /* |
585 | * Don't reset the retry counter for TEST UNIT READY commands, | |
25ff1c31 AS |
586 | * because they get issued after device resets which might be |
587 | * caused by a failed last-sector access. | |
588 | */ | |
589 | if (srb->cmnd[0] != TEST_UNIT_READY) | |
590 | us->last_sector_retries = 0; | |
591 | } | |
592 | ||
f0183a33 FB |
593 | /* |
594 | * Invoke the transport and basic error-handling/recovery methods | |
1da177e4 LT |
595 | * |
596 | * This is used by the protocol layers to actually send the message to | |
597 | * the device and receive the response. | |
598 | */ | |
599 | void usb_stor_invoke_transport(struct scsi_cmnd *srb, struct us_data *us) | |
600 | { | |
601 | int need_auto_sense; | |
602 | int result; | |
603 | ||
604 | /* send the command to the transport layer */ | |
6d416e61 | 605 | scsi_set_resid(srb, 0); |
1da177e4 LT |
606 | result = us->transport(srb, us); |
607 | ||
f0183a33 FB |
608 | /* |
609 | * if the command gets aborted by the higher layers, we need to | |
1da177e4 LT |
610 | * short-circuit all other processing |
611 | */ | |
7e4d6c38 | 612 | if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { |
191648d0 | 613 | usb_stor_dbg(us, "-- command was aborted\n"); |
4d07ef76 MD |
614 | srb->result = DID_ABORT << 16; |
615 | goto Handle_Errors; | |
1da177e4 LT |
616 | } |
617 | ||
618 | /* if there is a transport error, reset and don't auto-sense */ | |
619 | if (result == USB_STOR_TRANSPORT_ERROR) { | |
191648d0 | 620 | usb_stor_dbg(us, "-- transport indicates error, resetting\n"); |
1da177e4 | 621 | srb->result = DID_ERROR << 16; |
4d07ef76 | 622 | goto Handle_Errors; |
1da177e4 LT |
623 | } |
624 | ||
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; | |
25ff1c31 | 628 | last_sector_hacks(us, srb); |
1da177e4 LT |
629 | return; |
630 | } | |
631 | ||
632 | srb->result = SAM_STAT_GOOD; | |
633 | ||
f0183a33 FB |
634 | /* |
635 | * Determine if we need to auto-sense | |
1da177e4 LT |
636 | * |
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. | |
639 | */ | |
640 | need_auto_sense = 0; | |
641 | ||
642 | /* | |
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. | |
647 | */ | |
8fa7fd74 | 648 | if ((us->protocol == USB_PR_CB || us->protocol == USB_PR_DPCM_USB) && |
1da177e4 | 649 | srb->sc_data_direction != DMA_FROM_DEVICE) { |
191648d0 | 650 | usb_stor_dbg(us, "-- CB transport device requiring auto-sense\n"); |
1da177e4 LT |
651 | need_auto_sense = 1; |
652 | } | |
653 | ||
654 | /* | |
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. | |
658 | */ | |
659 | if (result == USB_STOR_TRANSPORT_FAILED) { | |
191648d0 | 660 | usb_stor_dbg(us, "-- transport indicates command failure\n"); |
1da177e4 LT |
661 | need_auto_sense = 1; |
662 | } | |
663 | ||
1537e0ad BE |
664 | /* |
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 | |
668 | * SANE_SENSE support | |
669 | */ | |
a0bb1081 | 670 | if (unlikely((srb->cmnd[0] == ATA_16 || srb->cmnd[0] == ATA_12) && |
1537e0ad BE |
671 | result == USB_STOR_TRANSPORT_GOOD && |
672 | !(us->fflags & US_FL_SANE_SENSE) && | |
a0bb1081 AS |
673 | !(us->fflags & US_FL_BAD_SENSE) && |
674 | !(srb->cmnd[2] & 0x20))) { | |
191648d0 | 675 | usb_stor_dbg(us, "-- SAT supported, increasing auto-sense\n"); |
1537e0ad BE |
676 | us->fflags |= US_FL_SANE_SENSE; |
677 | } | |
678 | ||
1da177e4 LT |
679 | /* |
680 | * A short transfer on a command where we don't expect it | |
681 | * is unusual, but it doesn't mean we need to auto-sense. | |
682 | */ | |
6d416e61 | 683 | if ((scsi_get_resid(srb) > 0) && |
1da177e4 LT |
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))) { | |
191648d0 | 689 | usb_stor_dbg(us, "-- unexpectedly short transfer\n"); |
1da177e4 LT |
690 | } |
691 | ||
692 | /* Now, if we need to do the auto-sense, let's do it */ | |
693 | if (need_auto_sense) { | |
694 | int temp_result; | |
dff6de73 | 695 | struct scsi_eh_save ses; |
1537e0ad | 696 | int sense_size = US_SENSE_SIZE; |
e16da02f LT |
697 | struct scsi_sense_hdr sshdr; |
698 | const u8 *scdd; | |
699 | u8 fm_ili; | |
1537e0ad BE |
700 | |
701 | /* device supports and needs bigger sense buffer */ | |
702 | if (us->fflags & US_FL_SANE_SENSE) | |
703 | sense_size = ~0; | |
b8430e1b | 704 | Retry_Sense: |
191648d0 | 705 | usb_stor_dbg(us, "Issuing auto-REQUEST_SENSE\n"); |
1da177e4 | 706 | |
1537e0ad | 707 | scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sense_size); |
1da177e4 LT |
708 | |
709 | /* FIXME: we must do the protocol translation here */ | |
8fa7fd74 MN |
710 | if (us->subclass == USB_SC_RBC || us->subclass == USB_SC_SCSI || |
711 | us->subclass == USB_SC_CYP_ATACB) | |
1da177e4 LT |
712 | srb->cmd_len = 6; |
713 | else | |
714 | srb->cmd_len = 12; | |
715 | ||
1da177e4 | 716 | /* issue the auto-sense command */ |
6d416e61 | 717 | scsi_set_resid(srb, 0); |
1da177e4 LT |
718 | temp_result = us->transport(us->srb, us); |
719 | ||
720 | /* let's clean up right away */ | |
dff6de73 | 721 | scsi_eh_restore_cmnd(srb, &ses); |
1da177e4 | 722 | |
7e4d6c38 | 723 | if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) { |
191648d0 | 724 | usb_stor_dbg(us, "-- auto-sense aborted\n"); |
4d07ef76 | 725 | srb->result = DID_ABORT << 16; |
a0bb1081 AS |
726 | |
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; | |
731 | } | |
4d07ef76 | 732 | goto Handle_Errors; |
1da177e4 | 733 | } |
b8430e1b | 734 | |
f0183a33 FB |
735 | /* |
736 | * Some devices claim to support larger sense but fail when | |
b8430e1b BH |
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 | |
740 | */ | |
741 | if (temp_result == USB_STOR_TRANSPORT_FAILED && | |
a0bb1081 | 742 | sense_size != US_SENSE_SIZE) { |
191648d0 | 743 | usb_stor_dbg(us, "-- auto-sense failure, retry small sense\n"); |
b8430e1b | 744 | sense_size = US_SENSE_SIZE; |
a0bb1081 AS |
745 | us->fflags &= ~US_FL_SANE_SENSE; |
746 | us->fflags |= US_FL_BAD_SENSE; | |
b8430e1b BH |
747 | goto Retry_Sense; |
748 | } | |
749 | ||
750 | /* Other failures */ | |
1da177e4 | 751 | if (temp_result != USB_STOR_TRANSPORT_GOOD) { |
191648d0 | 752 | usb_stor_dbg(us, "-- auto-sense failure\n"); |
1da177e4 | 753 | |
f0183a33 FB |
754 | /* |
755 | * we skip the reset if this happens to be a | |
1da177e4 LT |
756 | * multi-target device, since failure of an |
757 | * auto-sense is perfectly valid | |
758 | */ | |
1da177e4 | 759 | srb->result = DID_ERROR << 16; |
7e4d6c38 | 760 | if (!(us->fflags & US_FL_SCM_MULT_TARG)) |
4d07ef76 | 761 | goto Handle_Errors; |
1da177e4 LT |
762 | return; |
763 | } | |
764 | ||
f0183a33 FB |
765 | /* |
766 | * If the sense data returned is larger than 18-bytes then we | |
1537e0ad BE |
767 | * assume this device supports requesting more in the future. |
768 | * The response code must be 70h through 73h inclusive. | |
769 | */ | |
770 | if (srb->sense_buffer[7] > (US_SENSE_SIZE - 8) && | |
771 | !(us->fflags & US_FL_SANE_SENSE) && | |
a0bb1081 | 772 | !(us->fflags & US_FL_BAD_SENSE) && |
1537e0ad | 773 | (srb->sense_buffer[0] & 0x7C) == 0x70) { |
191648d0 | 774 | usb_stor_dbg(us, "-- SANE_SENSE support enabled\n"); |
1537e0ad BE |
775 | us->fflags |= US_FL_SANE_SENSE; |
776 | ||
f0183a33 FB |
777 | /* |
778 | * Indicate to the user that we truncated their sense | |
1537e0ad BE |
779 | * because we didn't know it supported larger sense. |
780 | */ | |
191648d0 JP |
781 | usb_stor_dbg(us, "-- Sense data truncated to %i from %i\n", |
782 | US_SENSE_SIZE, | |
783 | srb->sense_buffer[7] + 8); | |
1537e0ad BE |
784 | srb->sense_buffer[7] = (US_SENSE_SIZE - 8); |
785 | } | |
786 | ||
e16da02f LT |
787 | scsi_normalize_sense(srb->sense_buffer, SCSI_SENSE_BUFFERSIZE, |
788 | &sshdr); | |
789 | ||
191648d0 JP |
790 | usb_stor_dbg(us, "-- Result from auto-sense is %d\n", |
791 | temp_result); | |
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); | |
1da177e4 | 795 | #ifdef CONFIG_USB_STORAGE_DEBUG |
191648d0 | 796 | usb_stor_show_sense(us, sshdr.sense_key, sshdr.asc, sshdr.ascq); |
1da177e4 LT |
797 | #endif |
798 | ||
799 | /* set the result so the higher layers expect this data */ | |
800 | srb->result = SAM_STAT_CHECK_CONDITION; | |
801 | ||
e16da02f LT |
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; | |
805 | ||
f0183a33 FB |
806 | /* |
807 | * We often get empty sense data. This could indicate that | |
f1a0743b AS |
808 | * everything worked or that there was an unspecified |
809 | * problem. We have to decide which. | |
810 | */ | |
e16da02f LT |
811 | if (sshdr.sense_key == 0 && sshdr.asc == 0 && sshdr.ascq == 0 && |
812 | fm_ili == 0) { | |
f0183a33 FB |
813 | /* |
814 | * If things are really okay, then let's show that. | |
f1a0743b AS |
815 | * Zero out the sense buffer so the higher layers |
816 | * won't realize we did an unsolicited auto-sense. | |
817 | */ | |
818 | if (result == USB_STOR_TRANSPORT_GOOD) { | |
819 | srb->result = SAM_STAT_GOOD; | |
820 | srb->sense_buffer[0] = 0x0; | |
a4fd4a72 AS |
821 | } |
822 | ||
823 | /* | |
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 | |
827 | * wrong. | |
828 | */ | |
829 | else if (srb->cmnd[0] == ATA_16 || | |
830 | srb->cmnd[0] == ATA_12) { | |
831 | /* leave the data alone */ | |
832 | } | |
f1a0743b | 833 | |
f0183a33 FB |
834 | /* |
835 | * If there was a problem, report an unspecified | |
f1a0743b AS |
836 | * hardware error to prevent the higher layers from |
837 | * entering an infinite retry loop. | |
838 | */ | |
a4fd4a72 | 839 | else { |
f1a0743b | 840 | srb->result = DID_ERROR << 16; |
e16da02f LT |
841 | if ((sshdr.response_code & 0x72) == 0x72) |
842 | srb->sense_buffer[1] = HARDWARE_ERROR; | |
843 | else | |
844 | srb->sense_buffer[2] = HARDWARE_ERROR; | |
f1a0743b | 845 | } |
1da177e4 LT |
846 | } |
847 | } | |
848 | ||
21c13a4f AS |
849 | /* |
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. | |
856 | */ | |
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); | |
864 | } | |
865 | ||
866 | /* | |
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. | |
870 | */ | |
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; | |
875 | } | |
876 | } | |
877 | ||
1da177e4 | 878 | /* Did we transfer less than the minimum amount required? */ |
8bfa2472 | 879 | if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) && |
6d416e61 | 880 | scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow) |
1c9fbafc | 881 | srb->result = DID_ERROR << 16; |
1da177e4 | 882 | |
25ff1c31 | 883 | last_sector_hacks(us, srb); |
1da177e4 LT |
884 | return; |
885 | ||
f0183a33 FB |
886 | /* |
887 | * Error and abort processing: try to resynchronize with the device | |
4d07ef76 | 888 | * by issuing a port reset. If that fails, try a class-specific |
f0183a33 FB |
889 | * device reset. |
890 | */ | |
4d07ef76 MD |
891 | Handle_Errors: |
892 | ||
f0183a33 FB |
893 | /* |
894 | * Set the RESETTING bit, and clear the ABORTING bit so that | |
895 | * the reset may proceed. | |
896 | */ | |
4d07ef76 | 897 | scsi_lock(us_to_host(us)); |
7e4d6c38 AS |
898 | set_bit(US_FLIDX_RESETTING, &us->dflags); |
899 | clear_bit(US_FLIDX_ABORTING, &us->dflags); | |
4d07ef76 MD |
900 | scsi_unlock(us_to_host(us)); |
901 | ||
f0183a33 FB |
902 | /* |
903 | * We must release the device lock because the pre_reset routine | |
904 | * will want to acquire it. | |
905 | */ | |
47104b0d | 906 | mutex_unlock(&us->dev_mutex); |
4d07ef76 | 907 | result = usb_stor_port_reset(us); |
47104b0d AS |
908 | mutex_lock(&us->dev_mutex); |
909 | ||
4d07ef76 MD |
910 | if (result < 0) { |
911 | scsi_lock(us_to_host(us)); | |
912 | usb_stor_report_device_reset(us); | |
913 | scsi_unlock(us_to_host(us)); | |
1da177e4 | 914 | us->transport_reset(us); |
4d07ef76 | 915 | } |
7e4d6c38 | 916 | clear_bit(US_FLIDX_RESETTING, &us->dflags); |
25ff1c31 | 917 | last_sector_hacks(us, srb); |
1da177e4 LT |
918 | } |
919 | ||
920 | /* Stop the current URB transfer */ | |
921 | void usb_stor_stop_transport(struct us_data *us) | |
922 | { | |
f0183a33 FB |
923 | /* |
924 | * If the state machine is blocked waiting for an URB, | |
1da177e4 LT |
925 | * let's wake it up. The test_and_clear_bit() call |
926 | * guarantees that if a URB has just been submitted, | |
f0183a33 FB |
927 | * it won't be cancelled more than once. |
928 | */ | |
7e4d6c38 | 929 | if (test_and_clear_bit(US_FLIDX_URB_ACTIVE, &us->dflags)) { |
191648d0 | 930 | usb_stor_dbg(us, "-- cancelling URB\n"); |
1da177e4 LT |
931 | usb_unlink_urb(us->current_urb); |
932 | } | |
933 | ||
934 | /* If we are waiting for a scatter-gather operation, cancel it. */ | |
7e4d6c38 | 935 | if (test_and_clear_bit(US_FLIDX_SG_ACTIVE, &us->dflags)) { |
191648d0 | 936 | usb_stor_dbg(us, "-- cancelling sg request\n"); |
1da177e4 LT |
937 | usb_sg_cancel(&us->current_sg); |
938 | } | |
939 | } | |
940 | ||
941 | /* | |
64648a9d | 942 | * Control/Bulk and Control/Bulk/Interrupt transport |
1da177e4 LT |
943 | */ |
944 | ||
64648a9d | 945 | int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us) |
1da177e4 | 946 | { |
6d416e61 | 947 | unsigned int transfer_length = scsi_bufflen(srb); |
1da177e4 LT |
948 | unsigned int pipe = 0; |
949 | int result; | |
950 | ||
951 | /* COMMAND STAGE */ | |
952 | /* let's send the command via the control pipe */ | |
2ce9d227 PV |
953 | /* |
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. | |
956 | */ | |
957 | memcpy(us->iobuf, srb->cmnd, srb->cmd_len); | |
1da177e4 LT |
958 | result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe, |
959 | US_CBI_ADSC, | |
960 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0, | |
2ce9d227 | 961 | us->ifnum, us->iobuf, srb->cmd_len); |
1da177e4 LT |
962 | |
963 | /* check the return code for the command */ | |
191648d0 JP |
964 | usb_stor_dbg(us, "Call to usb_stor_ctrl_transfer() returned %d\n", |
965 | result); | |
1da177e4 LT |
966 | |
967 | /* if we stalled the command, it means command failed */ | |
968 | if (result == USB_STOR_XFER_STALLED) { | |
969 | return USB_STOR_TRANSPORT_FAILED; | |
970 | } | |
971 | ||
972 | /* Uh oh... serious problem here */ | |
973 | if (result != USB_STOR_XFER_GOOD) { | |
974 | return USB_STOR_TRANSPORT_ERROR; | |
975 | } | |
976 | ||
977 | /* DATA STAGE */ | |
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; | |
6d416e61 | 982 | result = usb_stor_bulk_srb(us, pipe, srb); |
191648d0 | 983 | usb_stor_dbg(us, "CBI data stage result is 0x%x\n", result); |
1da177e4 LT |
984 | |
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; | |
990 | } | |
991 | ||
992 | /* STATUS STAGE */ | |
64648a9d | 993 | |
f0183a33 FB |
994 | /* |
995 | * NOTE: CB does not have a status stage. Silly, I know. So | |
64648a9d AS |
996 | * we have to catch this at a higher level. |
997 | */ | |
8fa7fd74 | 998 | if (us->protocol != USB_PR_CBI) |
64648a9d AS |
999 | return USB_STOR_TRANSPORT_GOOD; |
1000 | ||
1da177e4 | 1001 | result = usb_stor_intr_transfer(us, us->iobuf, 2); |
191648d0 JP |
1002 | usb_stor_dbg(us, "Got interrupt data (0x%x, 0x%x)\n", |
1003 | us->iobuf[0], us->iobuf[1]); | |
1da177e4 LT |
1004 | if (result != USB_STOR_XFER_GOOD) |
1005 | return USB_STOR_TRANSPORT_ERROR; | |
1006 | ||
f0183a33 FB |
1007 | /* |
1008 | * UFI gives us ASC and ASCQ, like a request sense | |
1da177e4 LT |
1009 | * |
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. | |
1014 | */ | |
8fa7fd74 | 1015 | if (us->subclass == USB_SC_UFI) { |
1da177e4 LT |
1016 | if (srb->cmnd[0] == REQUEST_SENSE || |
1017 | srb->cmnd[0] == INQUIRY) | |
1018 | return USB_STOR_TRANSPORT_GOOD; | |
1019 | if (us->iobuf[0]) | |
1020 | goto Failed; | |
1021 | return USB_STOR_TRANSPORT_GOOD; | |
1022 | } | |
1023 | ||
f0183a33 FB |
1024 | /* |
1025 | * If not UFI, we interpret the data as a result code | |
1da177e4 LT |
1026 | * The first byte should always be a 0x0. |
1027 | * | |
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. | |
1030 | */ | |
1031 | if (us->iobuf[0]) { | |
191648d0 JP |
1032 | usb_stor_dbg(us, "CBI IRQ data showed reserved bType 0x%x\n", |
1033 | us->iobuf[0]); | |
1da177e4 LT |
1034 | goto Failed; |
1035 | ||
1036 | } | |
1037 | ||
1038 | /* The second byte & 0x0F should be 0x0 for good, otherwise error */ | |
1039 | switch (us->iobuf[1] & 0x0F) { | |
1040 | case 0x00: | |
1041 | return USB_STOR_TRANSPORT_GOOD; | |
1042 | case 0x01: | |
1043 | goto Failed; | |
1044 | } | |
1045 | return USB_STOR_TRANSPORT_ERROR; | |
1046 | ||
f0183a33 FB |
1047 | /* |
1048 | * the CBI spec requires that the bulk pipe must be cleared | |
1da177e4 LT |
1049 | * following any data-in/out command failure (section 2.4.3.1.3) |
1050 | */ | |
1051 | Failed: | |
1052 | if (pipe) | |
1053 | usb_stor_clear_halt(us, pipe); | |
1054 | return USB_STOR_TRANSPORT_FAILED; | |
1055 | } | |
e6e244b6 | 1056 | EXPORT_SYMBOL_GPL(usb_stor_CB_transport); |
1da177e4 | 1057 | |
1da177e4 LT |
1058 | /* |
1059 | * Bulk only transport | |
1060 | */ | |
1061 | ||
1062 | /* Determine what the maximum LUN supported is */ | |
1063 | int usb_stor_Bulk_max_lun(struct us_data *us) | |
1064 | { | |
1065 | int result; | |
1066 | ||
1067 | /* issue the command */ | |
b876aef7 | 1068 | us->iobuf[0] = 0; |
1da177e4 LT |
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, | |
7a777919 | 1073 | 0, us->ifnum, us->iobuf, 1, 10*HZ); |
1da177e4 | 1074 | |
191648d0 JP |
1075 | usb_stor_dbg(us, "GetMaxLUN command result is %d, data is %d\n", |
1076 | result, us->iobuf[0]); | |
1da177e4 | 1077 | |
55dc68c0 MK |
1078 | /* |
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. | |
1082 | */ | |
1083 | if (result > 0) { | |
1084 | if (us->iobuf[0] < 16) { | |
1085 | return us->iobuf[0]; | |
1086 | } else { | |
1087 | dev_info(&us->pusb_intf->dev, | |
1088 | "Max LUN %d is not valid, using 0 instead", | |
1089 | us->iobuf[0]); | |
1090 | } | |
1091 | } | |
1da177e4 | 1092 | |
1da177e4 LT |
1093 | /* |
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. | |
1099 | */ | |
1100 | return 0; | |
1101 | } | |
1102 | ||
1103 | int usb_stor_Bulk_transport(struct scsi_cmnd *srb, struct us_data *us) | |
1104 | { | |
1105 | struct bulk_cb_wrap *bcb = (struct bulk_cb_wrap *) us->iobuf; | |
1106 | struct bulk_cs_wrap *bcs = (struct bulk_cs_wrap *) us->iobuf; | |
6d416e61 | 1107 | unsigned int transfer_length = scsi_bufflen(srb); |
1da177e4 LT |
1108 | unsigned int residue; |
1109 | int result; | |
1110 | int fake_sense = 0; | |
1111 | unsigned int cswlen; | |
1112 | unsigned int cbwlen = US_BULK_CB_WRAP_LEN; | |
1113 | ||
1114 | /* Take care of BULK32 devices; set extra byte to 0 */ | |
7e4d6c38 | 1115 | if (unlikely(us->fflags & US_FL_BULK32)) { |
1da177e4 LT |
1116 | cbwlen = 32; |
1117 | us->iobuf[31] = 0; | |
1118 | } | |
1119 | ||
1120 | /* set up the command wrapper */ | |
1121 | bcb->Signature = cpu_to_le32(US_BULK_CB_SIGN); | |
1122 | bcb->DataTransferLength = cpu_to_le32(transfer_length); | |
b8db6d64 SAS |
1123 | bcb->Flags = srb->sc_data_direction == DMA_FROM_DEVICE ? |
1124 | US_BULK_FLAG_IN : 0; | |
0f64e078 | 1125 | bcb->Tag = ++us->tag; |
1da177e4 | 1126 | bcb->Lun = srb->device->lun; |
7e4d6c38 | 1127 | if (us->fflags & US_FL_SCM_MULT_TARG) |
1da177e4 LT |
1128 | bcb->Lun |= srb->device->id << 4; |
1129 | bcb->Length = srb->cmd_len; | |
1130 | ||
1131 | /* copy the command payload */ | |
1132 | memset(bcb->CDB, 0, sizeof(bcb->CDB)); | |
1133 | memcpy(bcb->CDB, srb->cmnd, bcb->Length); | |
1134 | ||
1135 | /* send it to out endpoint */ | |
191648d0 JP |
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), | |
1140 | bcb->Length); | |
1da177e4 LT |
1141 | result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe, |
1142 | bcb, cbwlen, NULL); | |
191648d0 | 1143 | usb_stor_dbg(us, "Bulk command transfer result=%d\n", result); |
1da177e4 LT |
1144 | if (result != USB_STOR_XFER_GOOD) |
1145 | return USB_STOR_TRANSPORT_ERROR; | |
1146 | ||
1147 | /* DATA STAGE */ | |
1148 | /* send/receive data payload, if there is any */ | |
1149 | ||
f0183a33 FB |
1150 | /* |
1151 | * Some USB-IDE converter chips need a 100us delay between the | |
1da177e4 | 1152 | * command phase and the data phase. Some devices need a little |
f0183a33 FB |
1153 | * more than that, probably because of clock rate inaccuracies. |
1154 | */ | |
7e4d6c38 | 1155 | if (unlikely(us->fflags & US_FL_GO_SLOW)) |
e616b39a | 1156 | usleep_range(125, 150); |
1da177e4 LT |
1157 | |
1158 | if (transfer_length) { | |
1159 | unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ? | |
1160 | us->recv_bulk_pipe : us->send_bulk_pipe; | |
6d416e61 | 1161 | result = usb_stor_bulk_srb(us, pipe, srb); |
191648d0 | 1162 | usb_stor_dbg(us, "Bulk data transfer result 0x%x\n", result); |
1da177e4 LT |
1163 | if (result == USB_STOR_XFER_ERROR) |
1164 | return USB_STOR_TRANSPORT_ERROR; | |
1165 | ||
f0183a33 FB |
1166 | /* |
1167 | * If the device tried to send back more data than the | |
1da177e4 LT |
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. | |
1172 | */ | |
1173 | if (result == USB_STOR_XFER_LONG) | |
1174 | fake_sense = 1; | |
93c9bf4d AS |
1175 | |
1176 | /* | |
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. | |
1181 | */ | |
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; | |
1188 | ||
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 && | |
1193 | bcs->Signature == | |
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; | |
1198 | } | |
1199 | } | |
1da177e4 LT |
1200 | } |
1201 | ||
f0183a33 FB |
1202 | /* |
1203 | * See flow chart on pg 15 of the Bulk Only Transport spec for | |
1da177e4 LT |
1204 | * an explanation of how this code works. |
1205 | */ | |
1206 | ||
1207 | /* get CSW for device status */ | |
191648d0 | 1208 | usb_stor_dbg(us, "Attempting to get CSW...\n"); |
1da177e4 LT |
1209 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, |
1210 | bcs, US_BULK_CS_WRAP_LEN, &cswlen); | |
1211 | ||
f0183a33 FB |
1212 | /* |
1213 | * Some broken devices add unnecessary zero-length packets to the | |
1da177e4 LT |
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. | |
1216 | */ | |
1217 | if (result == USB_STOR_XFER_SHORT && cswlen == 0) { | |
191648d0 | 1218 | usb_stor_dbg(us, "Received 0-length CSW; retrying...\n"); |
1da177e4 LT |
1219 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, |
1220 | bcs, US_BULK_CS_WRAP_LEN, &cswlen); | |
1221 | } | |
1222 | ||
1223 | /* did the attempt to read the CSW fail? */ | |
1224 | if (result == USB_STOR_XFER_STALLED) { | |
1225 | ||
1226 | /* get the status again */ | |
191648d0 | 1227 | usb_stor_dbg(us, "Attempting to get CSW (2nd try)...\n"); |
1da177e4 LT |
1228 | result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe, |
1229 | bcs, US_BULK_CS_WRAP_LEN, NULL); | |
1230 | } | |
1231 | ||
1232 | /* if we still have a failure at this point, we're in trouble */ | |
191648d0 | 1233 | usb_stor_dbg(us, "Bulk status result = %d\n", result); |
1da177e4 LT |
1234 | if (result != USB_STOR_XFER_GOOD) |
1235 | return USB_STOR_TRANSPORT_ERROR; | |
1236 | ||
93c9bf4d | 1237 | skipped_data_phase: |
1da177e4 LT |
1238 | /* check bulk status */ |
1239 | residue = le32_to_cpu(bcs->Residue); | |
191648d0 JP |
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); | |
7e4d6c38 | 1243 | if (!(bcs->Tag == us->tag || (us->fflags & US_FL_BULK_IGNORE_TAG)) || |
cc36bdd4 | 1244 | bcs->Status > US_BULK_STAT_PHASE) { |
191648d0 | 1245 | usb_stor_dbg(us, "Bulk logical error\n"); |
1da177e4 LT |
1246 | return USB_STOR_TRANSPORT_ERROR; |
1247 | } | |
1248 | ||
f0183a33 FB |
1249 | /* |
1250 | * Some broken devices report odd signatures, so we do not check them | |
1da177e4 LT |
1251 | * for validity against the spec. We store the first one we see, |
1252 | * and check subsequent transfers for validity against this signature. | |
1253 | */ | |
1254 | if (!us->bcs_signature) { | |
1255 | us->bcs_signature = bcs->Signature; | |
1256 | if (us->bcs_signature != cpu_to_le32(US_BULK_CS_SIGN)) | |
191648d0 JP |
1257 | usb_stor_dbg(us, "Learnt BCS signature 0x%08X\n", |
1258 | le32_to_cpu(us->bcs_signature)); | |
1da177e4 | 1259 | } else if (bcs->Signature != us->bcs_signature) { |
191648d0 JP |
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)); | |
1da177e4 LT |
1263 | return USB_STOR_TRANSPORT_ERROR; |
1264 | } | |
1265 | ||
f0183a33 FB |
1266 | /* |
1267 | * try to compute the actual residue, based on how much data | |
1268 | * was really transferred and what the device tells us | |
1269 | */ | |
59f4ff2e AS |
1270 | if (residue && !(us->fflags & US_FL_IGNORE_RESIDUE)) { |
1271 | ||
f0183a33 FB |
1272 | /* |
1273 | * Heuristically detect devices that generate bogus residues | |
59f4ff2e AS |
1274 | * by seeing what happens with INQUIRY and READ CAPACITY |
1275 | * commands. | |
1276 | */ | |
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; | |
1284 | ||
1285 | } else { | |
1da177e4 | 1286 | residue = min(residue, transfer_length); |
6d416e61 BH |
1287 | scsi_set_resid(srb, max(scsi_get_resid(srb), |
1288 | (int) residue)); | |
1da177e4 LT |
1289 | } |
1290 | } | |
1291 | ||
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 */ | |
1296 | if (fake_sense) { | |
1297 | memcpy(srb->sense_buffer, | |
1298 | usb_stor_sense_invalidCDB, | |
1299 | sizeof(usb_stor_sense_invalidCDB)); | |
1300 | return USB_STOR_TRANSPORT_NO_SENSE; | |
1301 | } | |
1302 | ||
1303 | /* command good -- note that data could be short */ | |
1304 | return USB_STOR_TRANSPORT_GOOD; | |
1305 | ||
1306 | case US_BULK_STAT_FAIL: | |
1307 | /* command failed */ | |
1308 | return USB_STOR_TRANSPORT_FAILED; | |
1309 | ||
1310 | case US_BULK_STAT_PHASE: | |
f0183a33 FB |
1311 | /* |
1312 | * phase error -- note that a transport reset will be | |
1da177e4 LT |
1313 | * invoked by the invoke_transport() function |
1314 | */ | |
1315 | return USB_STOR_TRANSPORT_ERROR; | |
1316 | } | |
1317 | ||
1318 | /* we should never get here, but if we do, we're in trouble */ | |
1319 | return USB_STOR_TRANSPORT_ERROR; | |
1320 | } | |
e6e244b6 | 1321 | EXPORT_SYMBOL_GPL(usb_stor_Bulk_transport); |
1da177e4 LT |
1322 | |
1323 | /*********************************************************************** | |
1324 | * Reset routines | |
1325 | ***********************************************************************/ | |
1326 | ||
f0183a33 FB |
1327 | /* |
1328 | * This is the common part of the device reset code. | |
1da177e4 LT |
1329 | * |
1330 | * It's handy that every transport mechanism uses the control endpoint for | |
1331 | * resets. | |
1332 | * | |
5203ad44 | 1333 | * Basically, we send a reset with a 5-second timeout, so we don't get |
1da177e4 LT |
1334 | * jammed attempting to do the reset. |
1335 | */ | |
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) | |
1339 | { | |
1340 | int result; | |
1341 | int result2; | |
1da177e4 | 1342 | |
7e4d6c38 | 1343 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
191648d0 | 1344 | usb_stor_dbg(us, "No reset during disconnect\n"); |
4d07ef76 MD |
1345 | return -EIO; |
1346 | } | |
1da177e4 | 1347 | |
1da177e4 LT |
1348 | result = usb_stor_control_msg(us, us->send_ctrl_pipe, |
1349 | request, requesttype, value, index, data, size, | |
5203ad44 | 1350 | 5*HZ); |
1da177e4 | 1351 | if (result < 0) { |
191648d0 | 1352 | usb_stor_dbg(us, "Soft reset failed: %d\n", result); |
4d07ef76 | 1353 | return result; |
1da177e4 LT |
1354 | } |
1355 | ||
f0183a33 FB |
1356 | /* |
1357 | * Give the device some time to recover from the reset, | |
1358 | * but don't delay disconnect processing. | |
1359 | */ | |
7e4d6c38 AS |
1360 | wait_event_interruptible_timeout(us->delay_wait, |
1361 | test_bit(US_FLIDX_DISCONNECTING, &us->dflags), | |
1362 | HZ*6); | |
1363 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { | |
191648d0 | 1364 | usb_stor_dbg(us, "Reset interrupted by disconnect\n"); |
4d07ef76 | 1365 | return -EIO; |
1da177e4 LT |
1366 | } |
1367 | ||
191648d0 | 1368 | usb_stor_dbg(us, "Soft reset: clearing bulk-in endpoint halt\n"); |
1da177e4 LT |
1369 | result = usb_stor_clear_halt(us, us->recv_bulk_pipe); |
1370 | ||
191648d0 | 1371 | usb_stor_dbg(us, "Soft reset: clearing bulk-out endpoint halt\n"); |
1da177e4 LT |
1372 | result2 = usb_stor_clear_halt(us, us->send_bulk_pipe); |
1373 | ||
5203ad44 MD |
1374 | /* return a result code based on the result of the clear-halts */ |
1375 | if (result >= 0) | |
1376 | result = result2; | |
4d07ef76 | 1377 | if (result < 0) |
191648d0 | 1378 | usb_stor_dbg(us, "Soft reset failed\n"); |
4d07ef76 | 1379 | else |
191648d0 | 1380 | usb_stor_dbg(us, "Soft reset done\n"); |
4d07ef76 | 1381 | return result; |
1da177e4 LT |
1382 | } |
1383 | ||
f0183a33 | 1384 | /* This issues a CB[I] Reset to the device in question */ |
1da177e4 LT |
1385 | #define CB_RESET_CMD_SIZE 12 |
1386 | ||
1387 | int usb_stor_CB_reset(struct us_data *us) | |
1388 | { | |
1da177e4 LT |
1389 | memset(us->iobuf, 0xFF, CB_RESET_CMD_SIZE); |
1390 | us->iobuf[0] = SEND_DIAGNOSTIC; | |
1391 | us->iobuf[1] = 4; | |
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); | |
1395 | } | |
e6e244b6 | 1396 | EXPORT_SYMBOL_GPL(usb_stor_CB_reset); |
1da177e4 | 1397 | |
f0183a33 FB |
1398 | /* |
1399 | * This issues a Bulk-only Reset to the device in question, including | |
1da177e4 LT |
1400 | * clearing the subsequent endpoint halts that may occur. |
1401 | */ | |
1402 | int usb_stor_Bulk_reset(struct us_data *us) | |
1403 | { | |
1da177e4 LT |
1404 | return usb_stor_reset_common(us, US_BULK_RESET_REQUEST, |
1405 | USB_TYPE_CLASS | USB_RECIP_INTERFACE, | |
1406 | 0, us->ifnum, NULL, 0); | |
1407 | } | |
e6e244b6 | 1408 | EXPORT_SYMBOL_GPL(usb_stor_Bulk_reset); |
4d07ef76 | 1409 | |
f0183a33 FB |
1410 | /* |
1411 | * Issue a USB port reset to the device. The caller must not hold | |
47104b0d AS |
1412 | * us->dev_mutex. |
1413 | */ | |
4d07ef76 MD |
1414 | int usb_stor_port_reset(struct us_data *us) |
1415 | { | |
011b15df | 1416 | int result; |
4d07ef76 | 1417 | |
5d398779 | 1418 | /*for these devices we must use the class specific method */ |
7fda953f | 1419 | if (us->pusb_dev->quirks & USB_QUIRK_RESET) |
5d398779 ON |
1420 | return -EPERM; |
1421 | ||
011b15df | 1422 | result = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf); |
47104b0d | 1423 | if (result < 0) |
191648d0 JP |
1424 | usb_stor_dbg(us, "unable to lock device for reset: %d\n", |
1425 | result); | |
47104b0d AS |
1426 | else { |
1427 | /* Were we disconnected while waiting for the lock? */ | |
7e4d6c38 | 1428 | if (test_bit(US_FLIDX_DISCONNECTING, &us->dflags)) { |
47104b0d | 1429 | result = -EIO; |
191648d0 | 1430 | usb_stor_dbg(us, "No reset during disconnect\n"); |
4d07ef76 | 1431 | } else { |
742120c6 | 1432 | result = usb_reset_device(us->pusb_dev); |
191648d0 JP |
1433 | usb_stor_dbg(us, "usb_reset_device returns %d\n", |
1434 | result); | |
4d07ef76 | 1435 | } |
011b15df | 1436 | usb_unlock_device(us->pusb_dev); |
4d07ef76 MD |
1437 | } |
1438 | return result; | |
1439 | } |