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net: DCB: Validate DCB_ATTR_DCB_BUFFER argument
[linux/fpc-iii.git] / drivers / usb / storage / uas.c
blob1ec1baa7604edc28d6c98d421646fef4f2c7cc1f
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * USB Attached SCSI
4 * Note that this is not the same as the USB Mass Storage driver
5 *
6 * Copyright Hans de Goede <hdegoede@redhat.com> for Red Hat, Inc. 2013 - 2016
7 * Copyright Matthew Wilcox for Intel Corp, 2010
8 * Copyright Sarah Sharp for Intel Corp, 2010
9 */
10
11 #include <linux/blkdev.h>
12 #include <linux/slab.h>
13 #include <linux/types.h>
14 #include <linux/module.h>
15 #include <linux/usb.h>
16 #include <linux/usb_usual.h>
17 #include <linux/usb/hcd.h>
18 #include <linux/usb/storage.h>
19 #include <linux/usb/uas.h>
20
21 #include <scsi/scsi.h>
22 #include <scsi/scsi_eh.h>
23 #include <scsi/scsi_dbg.h>
24 #include <scsi/scsi_cmnd.h>
25 #include <scsi/scsi_device.h>
26 #include <scsi/scsi_host.h>
27 #include <scsi/scsi_tcq.h>
28
29 #include "uas-detect.h"
30 #include "scsiglue.h"
31
32 #define MAX_CMNDS 256
33
34 struct uas_dev_info {
35 struct usb_interface *intf;
36 struct usb_device *udev;
37 struct usb_anchor cmd_urbs;
38 struct usb_anchor sense_urbs;
39 struct usb_anchor data_urbs;
40 unsigned long flags;
41 int qdepth, resetting;
42 unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
43 unsigned use_streams:1;
44 unsigned shutdown:1;
45 struct scsi_cmnd *cmnd[MAX_CMNDS];
46 spinlock_t lock;
47 struct work_struct work;
48 struct work_struct scan_work; /* for async scanning */
49 };
50
51 enum {
52 SUBMIT_STATUS_URB = BIT(1),
53 ALLOC_DATA_IN_URB = BIT(2),
54 SUBMIT_DATA_IN_URB = BIT(3),
55 ALLOC_DATA_OUT_URB = BIT(4),
56 SUBMIT_DATA_OUT_URB = BIT(5),
57 ALLOC_CMD_URB = BIT(6),
58 SUBMIT_CMD_URB = BIT(7),
59 COMMAND_INFLIGHT = BIT(8),
60 DATA_IN_URB_INFLIGHT = BIT(9),
61 DATA_OUT_URB_INFLIGHT = BIT(10),
62 COMMAND_ABORTED = BIT(11),
63 IS_IN_WORK_LIST = BIT(12),
64 };
65
66 /* Overrides scsi_pointer */
67 struct uas_cmd_info {
68 unsigned int state;
69 unsigned int uas_tag;
70 struct urb *cmd_urb;
71 struct urb *data_in_urb;
72 struct urb *data_out_urb;
73 };
74
75 /* I hate forward declarations, but I actually have a loop */
76 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
77 struct uas_dev_info *devinfo);
78 static void uas_do_work(struct work_struct *work);
79 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
80 static void uas_free_streams(struct uas_dev_info *devinfo);
81 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
82 int status);
83
84 /*
85 * This driver needs its own workqueue, as we need to control memory allocation.
86 *
87 * In the course of error handling and power management uas_wait_for_pending_cmnds()
88 * needs to flush pending work items. In these contexts we cannot allocate memory
89 * by doing block IO as we would deadlock. For the same reason we cannot wait
90 * for anything allocating memory not heeding these constraints.
91 *
92 * So we have to control all work items that can be on the workqueue we flush.
93 * Hence we cannot share a queue and need our own.
94 */
95 static struct workqueue_struct *workqueue;
96
97 static void uas_do_work(struct work_struct *work)
98 {
99 struct uas_dev_info *devinfo =
100 container_of(work, struct uas_dev_info, work);
101 struct uas_cmd_info *cmdinfo;
102 struct scsi_cmnd *cmnd;
103 unsigned long flags;
104 int i, err;
105
106 spin_lock_irqsave(&devinfo->lock, flags);
107
108 if (devinfo->resetting)
109 goto out;
110
111 for (i = 0; i < devinfo->qdepth; i++) {
112 if (!devinfo->cmnd[i])
113 continue;
114
115 cmnd = devinfo->cmnd[i];
116 cmdinfo = (void *)&cmnd->SCp;
117
118 if (!(cmdinfo->state & IS_IN_WORK_LIST))
119 continue;
120
121 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
122 if (!err)
123 cmdinfo->state &= ~IS_IN_WORK_LIST;
124 else
125 queue_work(workqueue, &devinfo->work);
126 }
127 out:
128 spin_unlock_irqrestore(&devinfo->lock, flags);
129 }
130
131 static void uas_scan_work(struct work_struct *work)
132 {
133 struct uas_dev_info *devinfo =
134 container_of(work, struct uas_dev_info, scan_work);
135 struct Scsi_Host *shost = usb_get_intfdata(devinfo->intf);
136
137 dev_dbg(&devinfo->intf->dev, "starting scan\n");
138 scsi_scan_host(shost);
139 dev_dbg(&devinfo->intf->dev, "scan complete\n");
140 }
141
142 static void uas_add_work(struct uas_cmd_info *cmdinfo)
143 {
144 struct scsi_pointer *scp = (void *)cmdinfo;
145 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp);
146 struct uas_dev_info *devinfo = cmnd->device->hostdata;
147
148 lockdep_assert_held(&devinfo->lock);
149 cmdinfo->state |= IS_IN_WORK_LIST;
150 queue_work(workqueue, &devinfo->work);
151 }
152
153 static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
154 {
155 struct uas_cmd_info *cmdinfo;
156 struct scsi_cmnd *cmnd;
157 unsigned long flags;
158 int i, err;
159
160 spin_lock_irqsave(&devinfo->lock, flags);
161 for (i = 0; i < devinfo->qdepth; i++) {
162 if (!devinfo->cmnd[i])
163 continue;
164
165 cmnd = devinfo->cmnd[i];
166 cmdinfo = (void *)&cmnd->SCp;
167 uas_log_cmd_state(cmnd, __func__, 0);
168 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
169 cmdinfo->state &= ~COMMAND_INFLIGHT;
170 cmnd->result = result << 16;
171 err = uas_try_complete(cmnd, __func__);
172 WARN_ON(err != 0);
173 }
174 spin_unlock_irqrestore(&devinfo->lock, flags);
175 }
176
177 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
178 {
179 struct sense_iu *sense_iu = urb->transfer_buffer;
180 struct scsi_device *sdev = cmnd->device;
181
182 if (urb->actual_length > 16) {
183 unsigned len = be16_to_cpup(&sense_iu->len);
184 if (len + 16 != urb->actual_length) {
185 int newlen = min(len + 16, urb->actual_length) - 16;
186 if (newlen < 0)
187 newlen = 0;
188 sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
189 "disagrees with IU sense data length %d, "
190 "using %d bytes of sense data\n", __func__,
191 urb->actual_length, len, newlen);
192 len = newlen;
193 }
194 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
195 }
196
197 cmnd->result = sense_iu->status;
198 }
199
200 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
201 int status)
202 {
203 struct uas_cmd_info *ci = (void *)&cmnd->SCp;
204 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
205
206 if (status == -ENODEV) /* too late */
207 return;
208
209 scmd_printk(KERN_INFO, cmnd,
210 "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
211 prefix, status, cmdinfo->uas_tag,
212 (ci->state & SUBMIT_STATUS_URB) ? " s-st" : "",
213 (ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "",
214 (ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "",
215 (ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "",
216 (ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "",
217 (ci->state & ALLOC_CMD_URB) ? " a-cmd" : "",
218 (ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "",
219 (ci->state & COMMAND_INFLIGHT) ? " CMD" : "",
220 (ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "",
221 (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "",
222 (ci->state & COMMAND_ABORTED) ? " abort" : "",
223 (ci->state & IS_IN_WORK_LIST) ? " work" : "");
224 scsi_print_command(cmnd);
225 }
226
227 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
228 {
229 struct uas_cmd_info *cmdinfo;
230
231 if (!cmnd)
232 return;
233
234 cmdinfo = (void *)&cmnd->SCp;
235
236 if (cmdinfo->state & SUBMIT_CMD_URB)
237 usb_free_urb(cmdinfo->cmd_urb);
238
239 /* data urbs may have never gotten their submit flag set */
240 if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
241 usb_free_urb(cmdinfo->data_in_urb);
242 if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
243 usb_free_urb(cmdinfo->data_out_urb);
244 }
245
246 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
247 {
248 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
249 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
250
251 lockdep_assert_held(&devinfo->lock);
252 if (cmdinfo->state & (COMMAND_INFLIGHT |
253 DATA_IN_URB_INFLIGHT |
254 DATA_OUT_URB_INFLIGHT |
255 COMMAND_ABORTED))
256 return -EBUSY;
257 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
258 uas_free_unsubmitted_urbs(cmnd);
259 cmnd->scsi_done(cmnd);
260 return 0;
261 }
262
263 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
264 unsigned direction)
265 {
266 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
267 int err;
268
269 cmdinfo->state |= direction | SUBMIT_STATUS_URB;
270 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
271 if (err) {
272 uas_add_work(cmdinfo);
273 }
274 }
275
276 static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
277 {
278 u8 response_code = riu->response_code;
279
280 switch (response_code) {
281 case RC_INCORRECT_LUN:
282 cmnd->result = DID_BAD_TARGET << 16;
283 break;
284 case RC_TMF_SUCCEEDED:
285 cmnd->result = DID_OK << 16;
286 break;
287 case RC_TMF_NOT_SUPPORTED:
288 cmnd->result = DID_TARGET_FAILURE << 16;
289 break;
290 default:
291 uas_log_cmd_state(cmnd, "response iu", response_code);
292 cmnd->result = DID_ERROR << 16;
293 break;
294 }
295
296 return response_code == RC_TMF_SUCCEEDED;
297 }
298
299 static void uas_stat_cmplt(struct urb *urb)
300 {
301 struct iu *iu = urb->transfer_buffer;
302 struct Scsi_Host *shost = urb->context;
303 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
304 struct urb *data_in_urb = NULL;
305 struct urb *data_out_urb = NULL;
306 struct scsi_cmnd *cmnd;
307 struct uas_cmd_info *cmdinfo;
308 unsigned long flags;
309 unsigned int idx;
310 int status = urb->status;
311 bool success;
312
313 spin_lock_irqsave(&devinfo->lock, flags);
314
315 if (devinfo->resetting)
316 goto out;
317
318 if (status) {
319 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
320 dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
321 goto out;
322 }
323
324 idx = be16_to_cpup(&iu->tag) - 1;
325 if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
326 dev_err(&urb->dev->dev,
327 "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
328 goto out;
329 }
330
331 cmnd = devinfo->cmnd[idx];
332 cmdinfo = (void *)&cmnd->SCp;
333
334 if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
335 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
336 goto out;
337 }
338
339 switch (iu->iu_id) {
340 case IU_ID_STATUS:
341 uas_sense(urb, cmnd);
342 if (cmnd->result != 0) {
343 /* cancel data transfers on error */
344 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
345 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
346 }
347 cmdinfo->state &= ~COMMAND_INFLIGHT;
348 uas_try_complete(cmnd, __func__);
349 break;
350 case IU_ID_READ_READY:
351 if (!cmdinfo->data_in_urb ||
352 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
353 uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
354 break;
355 }
356 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
357 break;
358 case IU_ID_WRITE_READY:
359 if (!cmdinfo->data_out_urb ||
360 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
361 uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
362 break;
363 }
364 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
365 break;
366 case IU_ID_RESPONSE:
367 cmdinfo->state &= ~COMMAND_INFLIGHT;
368 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
369 if (!success) {
370 /* Error, cancel data transfers */
371 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
372 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
373 }
374 uas_try_complete(cmnd, __func__);
375 break;
376 default:
377 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
378 }
379 out:
380 usb_free_urb(urb);
381 spin_unlock_irqrestore(&devinfo->lock, flags);
382
383 /* Unlinking of data urbs must be done without holding the lock */
384 if (data_in_urb) {
385 usb_unlink_urb(data_in_urb);
386 usb_put_urb(data_in_urb);
387 }
388 if (data_out_urb) {
389 usb_unlink_urb(data_out_urb);
390 usb_put_urb(data_out_urb);
391 }
392 }
393
394 static void uas_data_cmplt(struct urb *urb)
395 {
396 struct scsi_cmnd *cmnd = urb->context;
397 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
398 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
399 struct scsi_data_buffer *sdb = &cmnd->sdb;
400 unsigned long flags;
401 int status = urb->status;
402
403 spin_lock_irqsave(&devinfo->lock, flags);
404
405 if (cmdinfo->data_in_urb == urb) {
406 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
407 cmdinfo->data_in_urb = NULL;
408 } else if (cmdinfo->data_out_urb == urb) {
409 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
410 cmdinfo->data_out_urb = NULL;
411 }
412
413 if (devinfo->resetting)
414 goto out;
415
416 /* Data urbs should not complete before the cmd urb is submitted */
417 if (cmdinfo->state & SUBMIT_CMD_URB) {
418 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
419 goto out;
420 }
421
422 if (status) {
423 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
424 uas_log_cmd_state(cmnd, "data cmplt err", status);
425 /* error: no data transfered */
426 scsi_set_resid(cmnd, sdb->length);
427 } else {
428 scsi_set_resid(cmnd, sdb->length - urb->actual_length);
429 }
430 uas_try_complete(cmnd, __func__);
431 out:
432 usb_free_urb(urb);
433 spin_unlock_irqrestore(&devinfo->lock, flags);
434 }
435
436 static void uas_cmd_cmplt(struct urb *urb)
437 {
438 if (urb->status)
439 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
440
441 usb_free_urb(urb);
442 }
443
444 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
445 struct scsi_cmnd *cmnd,
446 enum dma_data_direction dir)
447 {
448 struct usb_device *udev = devinfo->udev;
449 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
450 struct urb *urb = usb_alloc_urb(0, gfp);
451 struct scsi_data_buffer *sdb = &cmnd->sdb;
452 unsigned int pipe = (dir == DMA_FROM_DEVICE)
453 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
454
455 if (!urb)
456 goto out;
457 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
458 uas_data_cmplt, cmnd);
459 if (devinfo->use_streams)
460 urb->stream_id = cmdinfo->uas_tag;
461 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
462 urb->sg = sdb->table.sgl;
463 out:
464 return urb;
465 }
466
467 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
468 struct scsi_cmnd *cmnd)
469 {
470 struct usb_device *udev = devinfo->udev;
471 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
472 struct urb *urb = usb_alloc_urb(0, gfp);
473 struct sense_iu *iu;
474
475 if (!urb)
476 goto out;
477
478 iu = kzalloc(sizeof(*iu), gfp);
479 if (!iu)
480 goto free;
481
482 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
483 uas_stat_cmplt, cmnd->device->host);
484 if (devinfo->use_streams)
485 urb->stream_id = cmdinfo->uas_tag;
486 urb->transfer_flags |= URB_FREE_BUFFER;
487 out:
488 return urb;
489 free:
490 usb_free_urb(urb);
491 return NULL;
492 }
493
494 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
495 struct scsi_cmnd *cmnd)
496 {
497 struct usb_device *udev = devinfo->udev;
498 struct scsi_device *sdev = cmnd->device;
499 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
500 struct urb *urb = usb_alloc_urb(0, gfp);
501 struct command_iu *iu;
502 int len;
503
504 if (!urb)
505 goto out;
506
507 len = cmnd->cmd_len - 16;
508 if (len < 0)
509 len = 0;
510 len = ALIGN(len, 4);
511 iu = kzalloc(sizeof(*iu) + len, gfp);
512 if (!iu)
513 goto free;
514
515 iu->iu_id = IU_ID_COMMAND;
516 iu->tag = cpu_to_be16(cmdinfo->uas_tag);
517 iu->prio_attr = UAS_SIMPLE_TAG;
518 iu->len = len;
519 int_to_scsilun(sdev->lun, &iu->lun);
520 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
521
522 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
523 uas_cmd_cmplt, NULL);
524 urb->transfer_flags |= URB_FREE_BUFFER;
525 out:
526 return urb;
527 free:
528 usb_free_urb(urb);
529 return NULL;
530 }
531
532 /*
533 * Why should I request the Status IU before sending the Command IU? Spec
534 * says to, but also says the device may receive them in any order. Seems
535 * daft to me.
536 */
537
538 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
539 {
540 struct uas_dev_info *devinfo = cmnd->device->hostdata;
541 struct urb *urb;
542 int err;
543
544 urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
545 if (!urb)
546 return NULL;
547 usb_anchor_urb(urb, &devinfo->sense_urbs);
548 err = usb_submit_urb(urb, gfp);
549 if (err) {
550 usb_unanchor_urb(urb);
551 uas_log_cmd_state(cmnd, "sense submit err", err);
552 usb_free_urb(urb);
553 return NULL;
554 }
555 return urb;
556 }
557
558 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
559 struct uas_dev_info *devinfo)
560 {
561 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
562 struct urb *urb;
563 int err;
564
565 lockdep_assert_held(&devinfo->lock);
566 if (cmdinfo->state & SUBMIT_STATUS_URB) {
567 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
568 if (!urb)
569 return SCSI_MLQUEUE_DEVICE_BUSY;
570 cmdinfo->state &= ~SUBMIT_STATUS_URB;
571 }
572
573 if (cmdinfo->state & ALLOC_DATA_IN_URB) {
574 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
575 cmnd, DMA_FROM_DEVICE);
576 if (!cmdinfo->data_in_urb)
577 return SCSI_MLQUEUE_DEVICE_BUSY;
578 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
579 }
580
581 if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
582 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
583 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
584 if (err) {
585 usb_unanchor_urb(cmdinfo->data_in_urb);
586 uas_log_cmd_state(cmnd, "data in submit err", err);
587 return SCSI_MLQUEUE_DEVICE_BUSY;
588 }
589 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
590 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
591 }
592
593 if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
594 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
595 cmnd, DMA_TO_DEVICE);
596 if (!cmdinfo->data_out_urb)
597 return SCSI_MLQUEUE_DEVICE_BUSY;
598 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
599 }
600
601 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
602 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
603 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
604 if (err) {
605 usb_unanchor_urb(cmdinfo->data_out_urb);
606 uas_log_cmd_state(cmnd, "data out submit err", err);
607 return SCSI_MLQUEUE_DEVICE_BUSY;
608 }
609 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
610 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
611 }
612
613 if (cmdinfo->state & ALLOC_CMD_URB) {
614 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
615 if (!cmdinfo->cmd_urb)
616 return SCSI_MLQUEUE_DEVICE_BUSY;
617 cmdinfo->state &= ~ALLOC_CMD_URB;
618 }
619
620 if (cmdinfo->state & SUBMIT_CMD_URB) {
621 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
622 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
623 if (err) {
624 usb_unanchor_urb(cmdinfo->cmd_urb);
625 uas_log_cmd_state(cmnd, "cmd submit err", err);
626 return SCSI_MLQUEUE_DEVICE_BUSY;
627 }
628 cmdinfo->cmd_urb = NULL;
629 cmdinfo->state &= ~SUBMIT_CMD_URB;
630 cmdinfo->state |= COMMAND_INFLIGHT;
631 }
632
633 return 0;
634 }
635
636 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
637 void (*done)(struct scsi_cmnd *))
638 {
639 struct scsi_device *sdev = cmnd->device;
640 struct uas_dev_info *devinfo = sdev->hostdata;
641 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
642 unsigned long flags;
643 int idx, err;
644
645 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
646
647 /* Re-check scsi_block_requests now that we've the host-lock */
648 if (cmnd->device->host->host_self_blocked)
649 return SCSI_MLQUEUE_DEVICE_BUSY;
650
651 if ((devinfo->flags & US_FL_NO_ATA_1X) &&
652 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
653 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
654 sizeof(usb_stor_sense_invalidCDB));
655 cmnd->result = SAM_STAT_CHECK_CONDITION;
656 cmnd->scsi_done(cmnd);
657 return 0;
658 }
659
660 spin_lock_irqsave(&devinfo->lock, flags);
661
662 if (devinfo->resetting) {
663 cmnd->result = DID_ERROR << 16;
664 cmnd->scsi_done(cmnd);
665 goto zombie;
666 }
667
668 /* Find a free uas-tag */
669 for (idx = 0; idx < devinfo->qdepth; idx++) {
670 if (!devinfo->cmnd[idx])
671 break;
672 }
673 if (idx == devinfo->qdepth) {
674 spin_unlock_irqrestore(&devinfo->lock, flags);
675 return SCSI_MLQUEUE_DEVICE_BUSY;
676 }
677
678 cmnd->scsi_done = done;
679
680 memset(cmdinfo, 0, sizeof(*cmdinfo));
681 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
682 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
683
684 switch (cmnd->sc_data_direction) {
685 case DMA_FROM_DEVICE:
686 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
687 break;
688 case DMA_BIDIRECTIONAL:
689 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
690 /* fall through */
691 case DMA_TO_DEVICE:
692 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
693 case DMA_NONE:
694 break;
695 }
696
697 if (!devinfo->use_streams)
698 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
699
700 err = uas_submit_urbs(cmnd, devinfo);
701 /*
702 * in case of fatal errors the SCSI layer is peculiar
703 * a command that has finished is a success for the purpose
704 * of queueing, no matter how fatal the error
705 */
706 if (err == -ENODEV) {
707 cmnd->result = DID_ERROR << 16;
708 cmnd->scsi_done(cmnd);
709 goto zombie;
710 }
711 if (err) {
712 /* If we did nothing, give up now */
713 if (cmdinfo->state & SUBMIT_STATUS_URB) {
714 spin_unlock_irqrestore(&devinfo->lock, flags);
715 return SCSI_MLQUEUE_DEVICE_BUSY;
716 }
717 uas_add_work(cmdinfo);
718 }
719
720 devinfo->cmnd[idx] = cmnd;
721 zombie:
722 spin_unlock_irqrestore(&devinfo->lock, flags);
723 return 0;
724 }
725
726 static DEF_SCSI_QCMD(uas_queuecommand)
727
728 /*
729 * For now we do not support actually sending an abort to the device, so
730 * this eh always fails. Still we must define it to make sure that we've
731 * dropped all references to the cmnd in question once this function exits.
732 */
733 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
734 {
735 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
736 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
737 struct urb *data_in_urb = NULL;
738 struct urb *data_out_urb = NULL;
739 unsigned long flags;
740
741 spin_lock_irqsave(&devinfo->lock, flags);
742
743 uas_log_cmd_state(cmnd, __func__, 0);
744
745 /* Ensure that try_complete does not call scsi_done */
746 cmdinfo->state |= COMMAND_ABORTED;
747
748 /* Drop all refs to this cmnd, kill data urbs to break their ref */
749 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
750 if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
751 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
752 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
753 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
754
755 uas_free_unsubmitted_urbs(cmnd);
756
757 spin_unlock_irqrestore(&devinfo->lock, flags);
758
759 if (data_in_urb) {
760 usb_kill_urb(data_in_urb);
761 usb_put_urb(data_in_urb);
762 }
763 if (data_out_urb) {
764 usb_kill_urb(data_out_urb);
765 usb_put_urb(data_out_urb);
766 }
767
768 return FAILED;
769 }
770
771 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
772 {
773 struct scsi_device *sdev = cmnd->device;
774 struct uas_dev_info *devinfo = sdev->hostdata;
775 struct usb_device *udev = devinfo->udev;
776 unsigned long flags;
777 int err;
778
779 err = usb_lock_device_for_reset(udev, devinfo->intf);
780 if (err) {
781 shost_printk(KERN_ERR, sdev->host,
782 "%s FAILED to get lock err %d\n", __func__, err);
783 return FAILED;
784 }
785
786 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
787
788 spin_lock_irqsave(&devinfo->lock, flags);
789 devinfo->resetting = 1;
790 spin_unlock_irqrestore(&devinfo->lock, flags);
791
792 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
793 usb_kill_anchored_urbs(&devinfo->sense_urbs);
794 usb_kill_anchored_urbs(&devinfo->data_urbs);
795 uas_zap_pending(devinfo, DID_RESET);
796
797 err = usb_reset_device(udev);
798
799 spin_lock_irqsave(&devinfo->lock, flags);
800 devinfo->resetting = 0;
801 spin_unlock_irqrestore(&devinfo->lock, flags);
802
803 usb_unlock_device(udev);
804
805 if (err) {
806 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
807 __func__, err);
808 return FAILED;
809 }
810
811 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
812 return SUCCESS;
813 }
814
815 static int uas_target_alloc(struct scsi_target *starget)
816 {
817 struct uas_dev_info *devinfo = (struct uas_dev_info *)
818 dev_to_shost(starget->dev.parent)->hostdata;
819
820 if (devinfo->flags & US_FL_NO_REPORT_LUNS)
821 starget->no_report_luns = 1;
822
823 return 0;
824 }
825
826 static int uas_slave_alloc(struct scsi_device *sdev)
827 {
828 struct uas_dev_info *devinfo =
829 (struct uas_dev_info *)sdev->host->hostdata;
830
831 sdev->hostdata = devinfo;
832
833 /*
834 * The protocol has no requirements on alignment in the strict sense.
835 * Controllers may or may not have alignment restrictions.
836 * As this is not exported, we use an extremely conservative guess.
837 */
838 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
839
840 if (devinfo->flags & US_FL_MAX_SECTORS_64)
841 blk_queue_max_hw_sectors(sdev->request_queue, 64);
842 else if (devinfo->flags & US_FL_MAX_SECTORS_240)
843 blk_queue_max_hw_sectors(sdev->request_queue, 240);
844
845 return 0;
846 }
847
848 static int uas_slave_configure(struct scsi_device *sdev)
849 {
850 struct uas_dev_info *devinfo = sdev->hostdata;
851
852 if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
853 sdev->no_report_opcodes = 1;
854
855 /* A few buggy USB-ATA bridges don't understand FUA */
856 if (devinfo->flags & US_FL_BROKEN_FUA)
857 sdev->broken_fua = 1;
858
859 /* UAS also needs to support FL_ALWAYS_SYNC */
860 if (devinfo->flags & US_FL_ALWAYS_SYNC) {
861 sdev->skip_ms_page_3f = 1;
862 sdev->skip_ms_page_8 = 1;
863 sdev->wce_default_on = 1;
864 }
865
866 /* Some disks cannot handle READ_CAPACITY_16 */
867 if (devinfo->flags & US_FL_NO_READ_CAPACITY_16)
868 sdev->no_read_capacity_16 = 1;
869
870 /*
871 * Some disks return the total number of blocks in response
872 * to READ CAPACITY rather than the highest block number.
873 * If this device makes that mistake, tell the sd driver.
874 */
875 if (devinfo->flags & US_FL_FIX_CAPACITY)
876 sdev->fix_capacity = 1;
877
878 /*
879 * in some cases we have to guess
880 */
881 if (devinfo->flags & US_FL_CAPACITY_HEURISTICS)
882 sdev->guess_capacity = 1;
883
884 /*
885 * Some devices don't like MODE SENSE with page=0x3f,
886 * which is the command used for checking if a device
887 * is write-protected. Now that we tell the sd driver
888 * to do a 192-byte transfer with this command the
889 * majority of devices work fine, but a few still can't
890 * handle it. The sd driver will simply assume those
891 * devices are write-enabled.
892 */
893 if (devinfo->flags & US_FL_NO_WP_DETECT)
894 sdev->skip_ms_page_3f = 1;
895
896 scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
897 return 0;
898 }
899
900 static struct scsi_host_template uas_host_template = {
901 .module = THIS_MODULE,
902 .name = "uas",
903 .queuecommand = uas_queuecommand,
904 .target_alloc = uas_target_alloc,
905 .slave_alloc = uas_slave_alloc,
906 .slave_configure = uas_slave_configure,
907 .eh_abort_handler = uas_eh_abort_handler,
908 .eh_device_reset_handler = uas_eh_device_reset_handler,
909 .this_id = -1,
910 .sg_tablesize = SG_NONE,
911 .skip_settle_delay = 1,
912 .dma_boundary = PAGE_SIZE - 1,
913 };
914
915 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
916 vendorName, productName, useProtocol, useTransport, \
917 initFunction, flags) \
918 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
919 .driver_info = (flags) }
920
921 static struct usb_device_id uas_usb_ids[] = {
922 # include "unusual_uas.h"
923 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
924 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
925 { }
926 };
927 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
928
929 #undef UNUSUAL_DEV
930
931 static int uas_switch_interface(struct usb_device *udev,
932 struct usb_interface *intf)
933 {
934 struct usb_host_interface *alt;
935
936 alt = uas_find_uas_alt_setting(intf);
937 if (!alt)
938 return -ENODEV;
939
940 return usb_set_interface(udev, alt->desc.bInterfaceNumber,
941 alt->desc.bAlternateSetting);
942 }
943
944 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
945 {
946 struct usb_host_endpoint *eps[4] = { };
947 struct usb_device *udev = devinfo->udev;
948 int r;
949
950 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
951 if (r)
952 return r;
953
954 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
955 usb_endpoint_num(&eps[0]->desc));
956 devinfo->status_pipe = usb_rcvbulkpipe(udev,
957 usb_endpoint_num(&eps[1]->desc));
958 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
959 usb_endpoint_num(&eps[2]->desc));
960 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
961 usb_endpoint_num(&eps[3]->desc));
962
963 if (udev->speed < USB_SPEED_SUPER) {
964 devinfo->qdepth = 32;
965 devinfo->use_streams = 0;
966 } else {
967 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
968 3, MAX_CMNDS, GFP_NOIO);
969 if (devinfo->qdepth < 0)
970 return devinfo->qdepth;
971 devinfo->use_streams = 1;
972 }
973
974 return 0;
975 }
976
977 static void uas_free_streams(struct uas_dev_info *devinfo)
978 {
979 struct usb_device *udev = devinfo->udev;
980 struct usb_host_endpoint *eps[3];
981
982 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
983 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
984 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
985 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
986 }
987
988 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
989 {
990 int result = -ENOMEM;
991 struct Scsi_Host *shost = NULL;
992 struct uas_dev_info *devinfo;
993 struct usb_device *udev = interface_to_usbdev(intf);
994 unsigned long dev_flags;
995
996 if (!uas_use_uas_driver(intf, id, &dev_flags))
997 return -ENODEV;
998
999 if (uas_switch_interface(udev, intf))
1000 return -ENODEV;
1001
1002 shost = scsi_host_alloc(&uas_host_template,
1003 sizeof(struct uas_dev_info));
1004 if (!shost)
1005 goto set_alt0;
1006
1007 shost->max_cmd_len = 16 + 252;
1008 shost->max_id = 1;
1009 shost->max_lun = 256;
1010 shost->max_channel = 0;
1011 shost->sg_tablesize = udev->bus->sg_tablesize;
1012
1013 devinfo = (struct uas_dev_info *)shost->hostdata;
1014 devinfo->intf = intf;
1015 devinfo->udev = udev;
1016 devinfo->resetting = 0;
1017 devinfo->shutdown = 0;
1018 devinfo->flags = dev_flags;
1019 init_usb_anchor(&devinfo->cmd_urbs);
1020 init_usb_anchor(&devinfo->sense_urbs);
1021 init_usb_anchor(&devinfo->data_urbs);
1022 spin_lock_init(&devinfo->lock);
1023 INIT_WORK(&devinfo->work, uas_do_work);
1024 INIT_WORK(&devinfo->scan_work, uas_scan_work);
1025
1026 result = uas_configure_endpoints(devinfo);
1027 if (result)
1028 goto set_alt0;
1029
1030 /*
1031 * 1 tag is reserved for untagged commands +
1032 * 1 tag to avoid off by one errors in some bridge firmwares
1033 */
1034 shost->can_queue = devinfo->qdepth - 2;
1035
1036 usb_set_intfdata(intf, shost);
1037 result = scsi_add_host(shost, &intf->dev);
1038 if (result)
1039 goto free_streams;
1040
1041 /* Submit the delayed_work for SCSI-device scanning */
1042 schedule_work(&devinfo->scan_work);
1043
1044 return result;
1045
1046 free_streams:
1047 uas_free_streams(devinfo);
1048 usb_set_intfdata(intf, NULL);
1049 set_alt0:
1050 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1051 if (shost)
1052 scsi_host_put(shost);
1053 return result;
1054 }
1055
1056 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
1057 {
1058 unsigned long flags;
1059 int i, r = 1;
1060
1061 spin_lock_irqsave(&devinfo->lock, flags);
1062
1063 for (i = 0; i < devinfo->qdepth; i++) {
1064 if (devinfo->cmnd[i]) {
1065 r = 0; /* Not empty */
1066 break;
1067 }
1068 }
1069
1070 spin_unlock_irqrestore(&devinfo->lock, flags);
1071
1072 return r;
1073 }
1074
1075 /*
1076 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1077 * get empty while there still is more work to do due to sense-urbs completing
1078 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1079 */
1080 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1081 {
1082 unsigned long start_time;
1083 int r;
1084
1085 start_time = jiffies;
1086 do {
1087 flush_work(&devinfo->work);
1088
1089 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1090 if (r == 0)
1091 return -ETIME;
1092
1093 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1094 if (r == 0)
1095 return -ETIME;
1096
1097 if (time_after(jiffies, start_time + 5 * HZ))
1098 return -ETIME;
1099 } while (!uas_cmnd_list_empty(devinfo));
1100
1101 return 0;
1102 }
1103
1104 static int uas_pre_reset(struct usb_interface *intf)
1105 {
1106 struct Scsi_Host *shost = usb_get_intfdata(intf);
1107 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1108 unsigned long flags;
1109
1110 if (devinfo->shutdown)
1111 return 0;
1112
1113 /* Block new requests */
1114 spin_lock_irqsave(shost->host_lock, flags);
1115 scsi_block_requests(shost);
1116 spin_unlock_irqrestore(shost->host_lock, flags);
1117
1118 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1119 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1120 scsi_unblock_requests(shost);
1121 return 1;
1122 }
1123
1124 uas_free_streams(devinfo);
1125
1126 return 0;
1127 }
1128
1129 static int uas_post_reset(struct usb_interface *intf)
1130 {
1131 struct Scsi_Host *shost = usb_get_intfdata(intf);
1132 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1133 unsigned long flags;
1134 int err;
1135
1136 if (devinfo->shutdown)
1137 return 0;
1138
1139 err = uas_configure_endpoints(devinfo);
1140 if (err && err != -ENODEV)
1141 shost_printk(KERN_ERR, shost,
1142 "%s: alloc streams error %d after reset",
1143 __func__, err);
1144
1145 /* we must unblock the host in every case lest we deadlock */
1146 spin_lock_irqsave(shost->host_lock, flags);
1147 scsi_report_bus_reset(shost, 0);
1148 spin_unlock_irqrestore(shost->host_lock, flags);
1149
1150 scsi_unblock_requests(shost);
1151
1152 return err ? 1 : 0;
1153 }
1154
1155 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1156 {
1157 struct Scsi_Host *shost = usb_get_intfdata(intf);
1158 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1159
1160 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1161 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1162 return -ETIME;
1163 }
1164
1165 return 0;
1166 }
1167
1168 static int uas_resume(struct usb_interface *intf)
1169 {
1170 return 0;
1171 }
1172
1173 static int uas_reset_resume(struct usb_interface *intf)
1174 {
1175 struct Scsi_Host *shost = usb_get_intfdata(intf);
1176 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1177 unsigned long flags;
1178 int err;
1179
1180 err = uas_configure_endpoints(devinfo);
1181 if (err) {
1182 shost_printk(KERN_ERR, shost,
1183 "%s: alloc streams error %d after reset",
1184 __func__, err);
1185 return -EIO;
1186 }
1187
1188 spin_lock_irqsave(shost->host_lock, flags);
1189 scsi_report_bus_reset(shost, 0);
1190 spin_unlock_irqrestore(shost->host_lock, flags);
1191
1192 return 0;
1193 }
1194
1195 static void uas_disconnect(struct usb_interface *intf)
1196 {
1197 struct Scsi_Host *shost = usb_get_intfdata(intf);
1198 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1199 unsigned long flags;
1200
1201 spin_lock_irqsave(&devinfo->lock, flags);
1202 devinfo->resetting = 1;
1203 spin_unlock_irqrestore(&devinfo->lock, flags);
1204
1205 cancel_work_sync(&devinfo->work);
1206 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1207 usb_kill_anchored_urbs(&devinfo->sense_urbs);
1208 usb_kill_anchored_urbs(&devinfo->data_urbs);
1209 uas_zap_pending(devinfo, DID_NO_CONNECT);
1210
1211 /*
1212 * Prevent SCSI scanning (if it hasn't started yet)
1213 * or wait for the SCSI-scanning routine to stop.
1214 */
1215 cancel_work_sync(&devinfo->scan_work);
1216
1217 scsi_remove_host(shost);
1218 uas_free_streams(devinfo);
1219 scsi_host_put(shost);
1220 }
1221
1222 /*
1223 * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1224 * hang on reboot when the device is still in uas mode. Note the reset is
1225 * necessary as some devices won't revert to usb-storage mode without it.
1226 */
1227 static void uas_shutdown(struct device *dev)
1228 {
1229 struct usb_interface *intf = to_usb_interface(dev);
1230 struct usb_device *udev = interface_to_usbdev(intf);
1231 struct Scsi_Host *shost = usb_get_intfdata(intf);
1232 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1233
1234 if (system_state != SYSTEM_RESTART)
1235 return;
1236
1237 devinfo->shutdown = 1;
1238 uas_free_streams(devinfo);
1239 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1240 usb_reset_device(udev);
1241 }
1242
1243 static struct usb_driver uas_driver = {
1244 .name = "uas",
1245 .probe = uas_probe,
1246 .disconnect = uas_disconnect,
1247 .pre_reset = uas_pre_reset,
1248 .post_reset = uas_post_reset,
1249 .suspend = uas_suspend,
1250 .resume = uas_resume,
1251 .reset_resume = uas_reset_resume,
1252 .drvwrap.driver.shutdown = uas_shutdown,
1253 .id_table = uas_usb_ids,
1254 };
1255
1256 static int __init uas_init(void)
1257 {
1258 int rv;
1259
1260 workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0);
1261 if (!workqueue)
1262 return -ENOMEM;
1263
1264 rv = usb_register(&uas_driver);
1265 if (rv) {
1266 destroy_workqueue(workqueue);
1267 return -ENOMEM;
1268 }
1269
1270 return 0;
1271 }
1272
1273 static void __exit uas_exit(void)
1274 {
1275 usb_deregister(&uas_driver);
1276 destroy_workqueue(workqueue);
1277 }
1278
1279 module_init(uas_init);
1280 module_exit(uas_exit);
1281
1282 MODULE_LICENSE("GPL");
1283 MODULE_IMPORT_NS(USB_STORAGE);
1284 MODULE_AUTHOR(
1285 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");
Linux with added FPC-III support