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dm writecache: add cond_resched to loop in persistent_memory_claim()
[linux/fpc-iii.git] / drivers / usb / storage / uas.c
blobd592071119ba6b84275dbe19916b8eaa20e24c82
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 spin_unlock_irqrestore(&devinfo->lock, flags);
666 return 0;
667 }
668
669 /* Find a free uas-tag */
670 for (idx = 0; idx < devinfo->qdepth; idx++) {
671 if (!devinfo->cmnd[idx])
672 break;
673 }
674 if (idx == devinfo->qdepth) {
675 spin_unlock_irqrestore(&devinfo->lock, flags);
676 return SCSI_MLQUEUE_DEVICE_BUSY;
677 }
678
679 cmnd->scsi_done = done;
680
681 memset(cmdinfo, 0, sizeof(*cmdinfo));
682 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
683 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
684
685 switch (cmnd->sc_data_direction) {
686 case DMA_FROM_DEVICE:
687 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
688 break;
689 case DMA_BIDIRECTIONAL:
690 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
691 /* fall through */
692 case DMA_TO_DEVICE:
693 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
694 case DMA_NONE:
695 break;
696 }
697
698 if (!devinfo->use_streams)
699 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
700
701 err = uas_submit_urbs(cmnd, devinfo);
702 if (err) {
703 /* If we did nothing, give up now */
704 if (cmdinfo->state & SUBMIT_STATUS_URB) {
705 spin_unlock_irqrestore(&devinfo->lock, flags);
706 return SCSI_MLQUEUE_DEVICE_BUSY;
707 }
708 uas_add_work(cmdinfo);
709 }
710
711 devinfo->cmnd[idx] = cmnd;
712 spin_unlock_irqrestore(&devinfo->lock, flags);
713 return 0;
714 }
715
716 static DEF_SCSI_QCMD(uas_queuecommand)
717
718 /*
719 * For now we do not support actually sending an abort to the device, so
720 * this eh always fails. Still we must define it to make sure that we've
721 * dropped all references to the cmnd in question once this function exits.
722 */
723 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
724 {
725 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
726 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
727 struct urb *data_in_urb = NULL;
728 struct urb *data_out_urb = NULL;
729 unsigned long flags;
730
731 spin_lock_irqsave(&devinfo->lock, flags);
732
733 uas_log_cmd_state(cmnd, __func__, 0);
734
735 /* Ensure that try_complete does not call scsi_done */
736 cmdinfo->state |= COMMAND_ABORTED;
737
738 /* Drop all refs to this cmnd, kill data urbs to break their ref */
739 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
740 if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
741 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
742 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
743 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
744
745 uas_free_unsubmitted_urbs(cmnd);
746
747 spin_unlock_irqrestore(&devinfo->lock, flags);
748
749 if (data_in_urb) {
750 usb_kill_urb(data_in_urb);
751 usb_put_urb(data_in_urb);
752 }
753 if (data_out_urb) {
754 usb_kill_urb(data_out_urb);
755 usb_put_urb(data_out_urb);
756 }
757
758 return FAILED;
759 }
760
761 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
762 {
763 struct scsi_device *sdev = cmnd->device;
764 struct uas_dev_info *devinfo = sdev->hostdata;
765 struct usb_device *udev = devinfo->udev;
766 unsigned long flags;
767 int err;
768
769 err = usb_lock_device_for_reset(udev, devinfo->intf);
770 if (err) {
771 shost_printk(KERN_ERR, sdev->host,
772 "%s FAILED to get lock err %d\n", __func__, err);
773 return FAILED;
774 }
775
776 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
777
778 spin_lock_irqsave(&devinfo->lock, flags);
779 devinfo->resetting = 1;
780 spin_unlock_irqrestore(&devinfo->lock, flags);
781
782 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
783 usb_kill_anchored_urbs(&devinfo->sense_urbs);
784 usb_kill_anchored_urbs(&devinfo->data_urbs);
785 uas_zap_pending(devinfo, DID_RESET);
786
787 err = usb_reset_device(udev);
788
789 spin_lock_irqsave(&devinfo->lock, flags);
790 devinfo->resetting = 0;
791 spin_unlock_irqrestore(&devinfo->lock, flags);
792
793 usb_unlock_device(udev);
794
795 if (err) {
796 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
797 __func__, err);
798 return FAILED;
799 }
800
801 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
802 return SUCCESS;
803 }
804
805 static int uas_target_alloc(struct scsi_target *starget)
806 {
807 struct uas_dev_info *devinfo = (struct uas_dev_info *)
808 dev_to_shost(starget->dev.parent)->hostdata;
809
810 if (devinfo->flags & US_FL_NO_REPORT_LUNS)
811 starget->no_report_luns = 1;
812
813 return 0;
814 }
815
816 static int uas_slave_alloc(struct scsi_device *sdev)
817 {
818 struct uas_dev_info *devinfo =
819 (struct uas_dev_info *)sdev->host->hostdata;
820
821 sdev->hostdata = devinfo;
822
823 /*
824 * The protocol has no requirements on alignment in the strict sense.
825 * Controllers may or may not have alignment restrictions.
826 * As this is not exported, we use an extremely conservative guess.
827 */
828 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
829
830 if (devinfo->flags & US_FL_MAX_SECTORS_64)
831 blk_queue_max_hw_sectors(sdev->request_queue, 64);
832 else if (devinfo->flags & US_FL_MAX_SECTORS_240)
833 blk_queue_max_hw_sectors(sdev->request_queue, 240);
834
835 return 0;
836 }
837
838 static int uas_slave_configure(struct scsi_device *sdev)
839 {
840 struct uas_dev_info *devinfo = sdev->hostdata;
841
842 if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
843 sdev->no_report_opcodes = 1;
844
845 /* A few buggy USB-ATA bridges don't understand FUA */
846 if (devinfo->flags & US_FL_BROKEN_FUA)
847 sdev->broken_fua = 1;
848
849 /* UAS also needs to support FL_ALWAYS_SYNC */
850 if (devinfo->flags & US_FL_ALWAYS_SYNC) {
851 sdev->skip_ms_page_3f = 1;
852 sdev->skip_ms_page_8 = 1;
853 sdev->wce_default_on = 1;
854 }
855
856 /* Some disks cannot handle READ_CAPACITY_16 */
857 if (devinfo->flags & US_FL_NO_READ_CAPACITY_16)
858 sdev->no_read_capacity_16 = 1;
859
860 /*
861 * Some disks return the total number of blocks in response
862 * to READ CAPACITY rather than the highest block number.
863 * If this device makes that mistake, tell the sd driver.
864 */
865 if (devinfo->flags & US_FL_FIX_CAPACITY)
866 sdev->fix_capacity = 1;
867
868 /*
869 * in some cases we have to guess
870 */
871 if (devinfo->flags & US_FL_CAPACITY_HEURISTICS)
872 sdev->guess_capacity = 1;
873
874 /*
875 * Some devices don't like MODE SENSE with page=0x3f,
876 * which is the command used for checking if a device
877 * is write-protected. Now that we tell the sd driver
878 * to do a 192-byte transfer with this command the
879 * majority of devices work fine, but a few still can't
880 * handle it. The sd driver will simply assume those
881 * devices are write-enabled.
882 */
883 if (devinfo->flags & US_FL_NO_WP_DETECT)
884 sdev->skip_ms_page_3f = 1;
885
886 scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
887 return 0;
888 }
889
890 static struct scsi_host_template uas_host_template = {
891 .module = THIS_MODULE,
892 .name = "uas",
893 .queuecommand = uas_queuecommand,
894 .target_alloc = uas_target_alloc,
895 .slave_alloc = uas_slave_alloc,
896 .slave_configure = uas_slave_configure,
897 .eh_abort_handler = uas_eh_abort_handler,
898 .eh_device_reset_handler = uas_eh_device_reset_handler,
899 .this_id = -1,
900 .skip_settle_delay = 1,
901 .dma_boundary = PAGE_SIZE - 1,
902 };
903
904 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
905 vendorName, productName, useProtocol, useTransport, \
906 initFunction, flags) \
907 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
908 .driver_info = (flags) }
909
910 static struct usb_device_id uas_usb_ids[] = {
911 # include "unusual_uas.h"
912 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
913 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
914 { }
915 };
916 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
917
918 #undef UNUSUAL_DEV
919
920 static int uas_switch_interface(struct usb_device *udev,
921 struct usb_interface *intf)
922 {
923 struct usb_host_interface *alt;
924
925 alt = uas_find_uas_alt_setting(intf);
926 if (!alt)
927 return -ENODEV;
928
929 return usb_set_interface(udev, alt->desc.bInterfaceNumber,
930 alt->desc.bAlternateSetting);
931 }
932
933 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
934 {
935 struct usb_host_endpoint *eps[4] = { };
936 struct usb_device *udev = devinfo->udev;
937 int r;
938
939 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
940 if (r)
941 return r;
942
943 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
944 usb_endpoint_num(&eps[0]->desc));
945 devinfo->status_pipe = usb_rcvbulkpipe(udev,
946 usb_endpoint_num(&eps[1]->desc));
947 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
948 usb_endpoint_num(&eps[2]->desc));
949 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
950 usb_endpoint_num(&eps[3]->desc));
951
952 if (udev->speed < USB_SPEED_SUPER) {
953 devinfo->qdepth = 32;
954 devinfo->use_streams = 0;
955 } else {
956 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
957 3, MAX_CMNDS, GFP_NOIO);
958 if (devinfo->qdepth < 0)
959 return devinfo->qdepth;
960 devinfo->use_streams = 1;
961 }
962
963 return 0;
964 }
965
966 static void uas_free_streams(struct uas_dev_info *devinfo)
967 {
968 struct usb_device *udev = devinfo->udev;
969 struct usb_host_endpoint *eps[3];
970
971 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
972 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
973 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
974 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
975 }
976
977 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
978 {
979 int result = -ENOMEM;
980 struct Scsi_Host *shost = NULL;
981 struct uas_dev_info *devinfo;
982 struct usb_device *udev = interface_to_usbdev(intf);
983 unsigned long dev_flags;
984
985 if (!uas_use_uas_driver(intf, id, &dev_flags))
986 return -ENODEV;
987
988 if (uas_switch_interface(udev, intf))
989 return -ENODEV;
990
991 shost = scsi_host_alloc(&uas_host_template,
992 sizeof(struct uas_dev_info));
993 if (!shost)
994 goto set_alt0;
995
996 shost->max_cmd_len = 16 + 252;
997 shost->max_id = 1;
998 shost->max_lun = 256;
999 shost->max_channel = 0;
1000 shost->sg_tablesize = udev->bus->sg_tablesize;
1001
1002 devinfo = (struct uas_dev_info *)shost->hostdata;
1003 devinfo->intf = intf;
1004 devinfo->udev = udev;
1005 devinfo->resetting = 0;
1006 devinfo->shutdown = 0;
1007 devinfo->flags = dev_flags;
1008 init_usb_anchor(&devinfo->cmd_urbs);
1009 init_usb_anchor(&devinfo->sense_urbs);
1010 init_usb_anchor(&devinfo->data_urbs);
1011 spin_lock_init(&devinfo->lock);
1012 INIT_WORK(&devinfo->work, uas_do_work);
1013 INIT_WORK(&devinfo->scan_work, uas_scan_work);
1014
1015 result = uas_configure_endpoints(devinfo);
1016 if (result)
1017 goto set_alt0;
1018
1019 /*
1020 * 1 tag is reserved for untagged commands +
1021 * 1 tag to avoid off by one errors in some bridge firmwares
1022 */
1023 shost->can_queue = devinfo->qdepth - 2;
1024
1025 usb_set_intfdata(intf, shost);
1026 result = scsi_add_host(shost, &intf->dev);
1027 if (result)
1028 goto free_streams;
1029
1030 /* Submit the delayed_work for SCSI-device scanning */
1031 schedule_work(&devinfo->scan_work);
1032
1033 return result;
1034
1035 free_streams:
1036 uas_free_streams(devinfo);
1037 usb_set_intfdata(intf, NULL);
1038 set_alt0:
1039 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1040 if (shost)
1041 scsi_host_put(shost);
1042 return result;
1043 }
1044
1045 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
1046 {
1047 unsigned long flags;
1048 int i, r = 1;
1049
1050 spin_lock_irqsave(&devinfo->lock, flags);
1051
1052 for (i = 0; i < devinfo->qdepth; i++) {
1053 if (devinfo->cmnd[i]) {
1054 r = 0; /* Not empty */
1055 break;
1056 }
1057 }
1058
1059 spin_unlock_irqrestore(&devinfo->lock, flags);
1060
1061 return r;
1062 }
1063
1064 /*
1065 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1066 * get empty while there still is more work to do due to sense-urbs completing
1067 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1068 */
1069 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1070 {
1071 unsigned long start_time;
1072 int r;
1073
1074 start_time = jiffies;
1075 do {
1076 flush_work(&devinfo->work);
1077
1078 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1079 if (r == 0)
1080 return -ETIME;
1081
1082 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1083 if (r == 0)
1084 return -ETIME;
1085
1086 if (time_after(jiffies, start_time + 5 * HZ))
1087 return -ETIME;
1088 } while (!uas_cmnd_list_empty(devinfo));
1089
1090 return 0;
1091 }
1092
1093 static int uas_pre_reset(struct usb_interface *intf)
1094 {
1095 struct Scsi_Host *shost = usb_get_intfdata(intf);
1096 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1097 unsigned long flags;
1098
1099 if (devinfo->shutdown)
1100 return 0;
1101
1102 /* Block new requests */
1103 spin_lock_irqsave(shost->host_lock, flags);
1104 scsi_block_requests(shost);
1105 spin_unlock_irqrestore(shost->host_lock, flags);
1106
1107 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1108 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1109 scsi_unblock_requests(shost);
1110 return 1;
1111 }
1112
1113 uas_free_streams(devinfo);
1114
1115 return 0;
1116 }
1117
1118 static int uas_post_reset(struct usb_interface *intf)
1119 {
1120 struct Scsi_Host *shost = usb_get_intfdata(intf);
1121 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1122 unsigned long flags;
1123 int err;
1124
1125 if (devinfo->shutdown)
1126 return 0;
1127
1128 err = uas_configure_endpoints(devinfo);
1129 if (err && err != -ENODEV)
1130 shost_printk(KERN_ERR, shost,
1131 "%s: alloc streams error %d after reset",
1132 __func__, err);
1133
1134 /* we must unblock the host in every case lest we deadlock */
1135 spin_lock_irqsave(shost->host_lock, flags);
1136 scsi_report_bus_reset(shost, 0);
1137 spin_unlock_irqrestore(shost->host_lock, flags);
1138
1139 scsi_unblock_requests(shost);
1140
1141 return err ? 1 : 0;
1142 }
1143
1144 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1145 {
1146 struct Scsi_Host *shost = usb_get_intfdata(intf);
1147 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1148
1149 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1150 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1151 return -ETIME;
1152 }
1153
1154 return 0;
1155 }
1156
1157 static int uas_resume(struct usb_interface *intf)
1158 {
1159 return 0;
1160 }
1161
1162 static int uas_reset_resume(struct usb_interface *intf)
1163 {
1164 struct Scsi_Host *shost = usb_get_intfdata(intf);
1165 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1166 unsigned long flags;
1167 int err;
1168
1169 err = uas_configure_endpoints(devinfo);
1170 if (err) {
1171 shost_printk(KERN_ERR, shost,
1172 "%s: alloc streams error %d after reset",
1173 __func__, err);
1174 return -EIO;
1175 }
1176
1177 spin_lock_irqsave(shost->host_lock, flags);
1178 scsi_report_bus_reset(shost, 0);
1179 spin_unlock_irqrestore(shost->host_lock, flags);
1180
1181 return 0;
1182 }
1183
1184 static void uas_disconnect(struct usb_interface *intf)
1185 {
1186 struct Scsi_Host *shost = usb_get_intfdata(intf);
1187 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1188 unsigned long flags;
1189
1190 spin_lock_irqsave(&devinfo->lock, flags);
1191 devinfo->resetting = 1;
1192 spin_unlock_irqrestore(&devinfo->lock, flags);
1193
1194 cancel_work_sync(&devinfo->work);
1195 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1196 usb_kill_anchored_urbs(&devinfo->sense_urbs);
1197 usb_kill_anchored_urbs(&devinfo->data_urbs);
1198 uas_zap_pending(devinfo, DID_NO_CONNECT);
1199
1200 /*
1201 * Prevent SCSI scanning (if it hasn't started yet)
1202 * or wait for the SCSI-scanning routine to stop.
1203 */
1204 cancel_work_sync(&devinfo->scan_work);
1205
1206 scsi_remove_host(shost);
1207 uas_free_streams(devinfo);
1208 scsi_host_put(shost);
1209 }
1210
1211 /*
1212 * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1213 * hang on reboot when the device is still in uas mode. Note the reset is
1214 * necessary as some devices won't revert to usb-storage mode without it.
1215 */
1216 static void uas_shutdown(struct device *dev)
1217 {
1218 struct usb_interface *intf = to_usb_interface(dev);
1219 struct usb_device *udev = interface_to_usbdev(intf);
1220 struct Scsi_Host *shost = usb_get_intfdata(intf);
1221 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1222
1223 if (system_state != SYSTEM_RESTART)
1224 return;
1225
1226 devinfo->shutdown = 1;
1227 uas_free_streams(devinfo);
1228 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1229 usb_reset_device(udev);
1230 }
1231
1232 static struct usb_driver uas_driver = {
1233 .name = "uas",
1234 .probe = uas_probe,
1235 .disconnect = uas_disconnect,
1236 .pre_reset = uas_pre_reset,
1237 .post_reset = uas_post_reset,
1238 .suspend = uas_suspend,
1239 .resume = uas_resume,
1240 .reset_resume = uas_reset_resume,
1241 .drvwrap.driver.shutdown = uas_shutdown,
1242 .id_table = uas_usb_ids,
1243 };
1244
1245 static int __init uas_init(void)
1246 {
1247 int rv;
1248
1249 workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0);
1250 if (!workqueue)
1251 return -ENOMEM;
1252
1253 rv = usb_register(&uas_driver);
1254 if (rv) {
1255 destroy_workqueue(workqueue);
1256 return -ENOMEM;
1257 }
1258
1259 return 0;
1260 }
1261
1262 static void __exit uas_exit(void)
1263 {
1264 usb_deregister(&uas_driver);
1265 destroy_workqueue(workqueue);
1266 }
1267
1268 module_init(uas_init);
1269 module_exit(uas_exit);
1270
1271 MODULE_LICENSE("GPL");
1272 MODULE_IMPORT_NS(USB_STORAGE);
1273 MODULE_AUTHOR(
1274 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");
Linux with added FPC-III support