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Linux 4.19.133
[linux/fpc-iii.git] / drivers / usb / storage / uas.c
blob27d8b4b6ff593c119162a1e4ed06b3161199b693
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 = NULL;
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 sdb = scsi_in(cmnd);
407 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
408 cmdinfo->data_in_urb = NULL;
409 } else if (cmdinfo->data_out_urb == urb) {
410 sdb = scsi_out(cmnd);
411 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
412 cmdinfo->data_out_urb = NULL;
413 }
414 if (sdb == NULL) {
415 WARN_ON_ONCE(1);
416 goto out;
417 }
418
419 if (devinfo->resetting)
420 goto out;
421
422 /* Data urbs should not complete before the cmd urb is submitted */
423 if (cmdinfo->state & SUBMIT_CMD_URB) {
424 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
425 goto out;
426 }
427
428 if (status) {
429 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
430 uas_log_cmd_state(cmnd, "data cmplt err", status);
431 /* error: no data transfered */
432 sdb->resid = sdb->length;
433 } else {
434 sdb->resid = sdb->length - urb->actual_length;
435 }
436 uas_try_complete(cmnd, __func__);
437 out:
438 usb_free_urb(urb);
439 spin_unlock_irqrestore(&devinfo->lock, flags);
440 }
441
442 static void uas_cmd_cmplt(struct urb *urb)
443 {
444 if (urb->status)
445 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
446
447 usb_free_urb(urb);
448 }
449
450 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
451 struct scsi_cmnd *cmnd,
452 enum dma_data_direction dir)
453 {
454 struct usb_device *udev = devinfo->udev;
455 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
456 struct urb *urb = usb_alloc_urb(0, gfp);
457 struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
458 ? scsi_in(cmnd) : scsi_out(cmnd);
459 unsigned int pipe = (dir == DMA_FROM_DEVICE)
460 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
461
462 if (!urb)
463 goto out;
464 usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
465 uas_data_cmplt, cmnd);
466 if (devinfo->use_streams)
467 urb->stream_id = cmdinfo->uas_tag;
468 urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
469 urb->sg = sdb->table.sgl;
470 out:
471 return urb;
472 }
473
474 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
475 struct scsi_cmnd *cmnd)
476 {
477 struct usb_device *udev = devinfo->udev;
478 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
479 struct urb *urb = usb_alloc_urb(0, gfp);
480 struct sense_iu *iu;
481
482 if (!urb)
483 goto out;
484
485 iu = kzalloc(sizeof(*iu), gfp);
486 if (!iu)
487 goto free;
488
489 usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
490 uas_stat_cmplt, cmnd->device->host);
491 if (devinfo->use_streams)
492 urb->stream_id = cmdinfo->uas_tag;
493 urb->transfer_flags |= URB_FREE_BUFFER;
494 out:
495 return urb;
496 free:
497 usb_free_urb(urb);
498 return NULL;
499 }
500
501 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
502 struct scsi_cmnd *cmnd)
503 {
504 struct usb_device *udev = devinfo->udev;
505 struct scsi_device *sdev = cmnd->device;
506 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
507 struct urb *urb = usb_alloc_urb(0, gfp);
508 struct command_iu *iu;
509 int len;
510
511 if (!urb)
512 goto out;
513
514 len = cmnd->cmd_len - 16;
515 if (len < 0)
516 len = 0;
517 len = ALIGN(len, 4);
518 iu = kzalloc(sizeof(*iu) + len, gfp);
519 if (!iu)
520 goto free;
521
522 iu->iu_id = IU_ID_COMMAND;
523 iu->tag = cpu_to_be16(cmdinfo->uas_tag);
524 iu->prio_attr = UAS_SIMPLE_TAG;
525 iu->len = len;
526 int_to_scsilun(sdev->lun, &iu->lun);
527 memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
528
529 usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
530 uas_cmd_cmplt, NULL);
531 urb->transfer_flags |= URB_FREE_BUFFER;
532 out:
533 return urb;
534 free:
535 usb_free_urb(urb);
536 return NULL;
537 }
538
539 /*
540 * Why should I request the Status IU before sending the Command IU? Spec
541 * says to, but also says the device may receive them in any order. Seems
542 * daft to me.
543 */
544
545 static struct urb *uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
546 {
547 struct uas_dev_info *devinfo = cmnd->device->hostdata;
548 struct urb *urb;
549 int err;
550
551 urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
552 if (!urb)
553 return NULL;
554 usb_anchor_urb(urb, &devinfo->sense_urbs);
555 err = usb_submit_urb(urb, gfp);
556 if (err) {
557 usb_unanchor_urb(urb);
558 uas_log_cmd_state(cmnd, "sense submit err", err);
559 usb_free_urb(urb);
560 return NULL;
561 }
562 return urb;
563 }
564
565 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
566 struct uas_dev_info *devinfo)
567 {
568 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
569 struct urb *urb;
570 int err;
571
572 lockdep_assert_held(&devinfo->lock);
573 if (cmdinfo->state & SUBMIT_STATUS_URB) {
574 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
575 if (!urb)
576 return SCSI_MLQUEUE_DEVICE_BUSY;
577 cmdinfo->state &= ~SUBMIT_STATUS_URB;
578 }
579
580 if (cmdinfo->state & ALLOC_DATA_IN_URB) {
581 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
582 cmnd, DMA_FROM_DEVICE);
583 if (!cmdinfo->data_in_urb)
584 return SCSI_MLQUEUE_DEVICE_BUSY;
585 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
586 }
587
588 if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
589 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
590 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
591 if (err) {
592 usb_unanchor_urb(cmdinfo->data_in_urb);
593 uas_log_cmd_state(cmnd, "data in submit err", err);
594 return SCSI_MLQUEUE_DEVICE_BUSY;
595 }
596 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
597 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
598 }
599
600 if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
601 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
602 cmnd, DMA_TO_DEVICE);
603 if (!cmdinfo->data_out_urb)
604 return SCSI_MLQUEUE_DEVICE_BUSY;
605 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
606 }
607
608 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
609 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
610 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
611 if (err) {
612 usb_unanchor_urb(cmdinfo->data_out_urb);
613 uas_log_cmd_state(cmnd, "data out submit err", err);
614 return SCSI_MLQUEUE_DEVICE_BUSY;
615 }
616 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
617 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
618 }
619
620 if (cmdinfo->state & ALLOC_CMD_URB) {
621 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
622 if (!cmdinfo->cmd_urb)
623 return SCSI_MLQUEUE_DEVICE_BUSY;
624 cmdinfo->state &= ~ALLOC_CMD_URB;
625 }
626
627 if (cmdinfo->state & SUBMIT_CMD_URB) {
628 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
629 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
630 if (err) {
631 usb_unanchor_urb(cmdinfo->cmd_urb);
632 uas_log_cmd_state(cmnd, "cmd submit err", err);
633 return SCSI_MLQUEUE_DEVICE_BUSY;
634 }
635 cmdinfo->cmd_urb = NULL;
636 cmdinfo->state &= ~SUBMIT_CMD_URB;
637 cmdinfo->state |= COMMAND_INFLIGHT;
638 }
639
640 return 0;
641 }
642
643 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
644 void (*done)(struct scsi_cmnd *))
645 {
646 struct scsi_device *sdev = cmnd->device;
647 struct uas_dev_info *devinfo = sdev->hostdata;
648 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
649 unsigned long flags;
650 int idx, err;
651
652 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
653
654 /* Re-check scsi_block_requests now that we've the host-lock */
655 if (cmnd->device->host->host_self_blocked)
656 return SCSI_MLQUEUE_DEVICE_BUSY;
657
658 if ((devinfo->flags & US_FL_NO_ATA_1X) &&
659 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
660 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
661 sizeof(usb_stor_sense_invalidCDB));
662 cmnd->result = SAM_STAT_CHECK_CONDITION;
663 cmnd->scsi_done(cmnd);
664 return 0;
665 }
666
667 spin_lock_irqsave(&devinfo->lock, flags);
668
669 if (devinfo->resetting) {
670 cmnd->result = DID_ERROR << 16;
671 cmnd->scsi_done(cmnd);
672 spin_unlock_irqrestore(&devinfo->lock, flags);
673 return 0;
674 }
675
676 /* Find a free uas-tag */
677 for (idx = 0; idx < devinfo->qdepth; idx++) {
678 if (!devinfo->cmnd[idx])
679 break;
680 }
681 if (idx == devinfo->qdepth) {
682 spin_unlock_irqrestore(&devinfo->lock, flags);
683 return SCSI_MLQUEUE_DEVICE_BUSY;
684 }
685
686 cmnd->scsi_done = done;
687
688 memset(cmdinfo, 0, sizeof(*cmdinfo));
689 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
690 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
691
692 switch (cmnd->sc_data_direction) {
693 case DMA_FROM_DEVICE:
694 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
695 break;
696 case DMA_BIDIRECTIONAL:
697 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
698 /* fall through */
699 case DMA_TO_DEVICE:
700 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
701 case DMA_NONE:
702 break;
703 }
704
705 if (!devinfo->use_streams)
706 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
707
708 err = uas_submit_urbs(cmnd, devinfo);
709 if (err) {
710 /* If we did nothing, give up now */
711 if (cmdinfo->state & SUBMIT_STATUS_URB) {
712 spin_unlock_irqrestore(&devinfo->lock, flags);
713 return SCSI_MLQUEUE_DEVICE_BUSY;
714 }
715 uas_add_work(cmdinfo);
716 }
717
718 devinfo->cmnd[idx] = cmnd;
719 spin_unlock_irqrestore(&devinfo->lock, flags);
720 return 0;
721 }
722
723 static DEF_SCSI_QCMD(uas_queuecommand)
724
725 /*
726 * For now we do not support actually sending an abort to the device, so
727 * this eh always fails. Still we must define it to make sure that we've
728 * dropped all references to the cmnd in question once this function exits.
729 */
730 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
731 {
732 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
733 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
734 struct urb *data_in_urb = NULL;
735 struct urb *data_out_urb = NULL;
736 unsigned long flags;
737
738 spin_lock_irqsave(&devinfo->lock, flags);
739
740 uas_log_cmd_state(cmnd, __func__, 0);
741
742 /* Ensure that try_complete does not call scsi_done */
743 cmdinfo->state |= COMMAND_ABORTED;
744
745 /* Drop all refs to this cmnd, kill data urbs to break their ref */
746 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
747 if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
748 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
749 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
750 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
751
752 uas_free_unsubmitted_urbs(cmnd);
753
754 spin_unlock_irqrestore(&devinfo->lock, flags);
755
756 if (data_in_urb) {
757 usb_kill_urb(data_in_urb);
758 usb_put_urb(data_in_urb);
759 }
760 if (data_out_urb) {
761 usb_kill_urb(data_out_urb);
762 usb_put_urb(data_out_urb);
763 }
764
765 return FAILED;
766 }
767
768 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
769 {
770 struct scsi_device *sdev = cmnd->device;
771 struct uas_dev_info *devinfo = sdev->hostdata;
772 struct usb_device *udev = devinfo->udev;
773 unsigned long flags;
774 int err;
775
776 err = usb_lock_device_for_reset(udev, devinfo->intf);
777 if (err) {
778 shost_printk(KERN_ERR, sdev->host,
779 "%s FAILED to get lock err %d\n", __func__, err);
780 return FAILED;
781 }
782
783 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
784
785 spin_lock_irqsave(&devinfo->lock, flags);
786 devinfo->resetting = 1;
787 spin_unlock_irqrestore(&devinfo->lock, flags);
788
789 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
790 usb_kill_anchored_urbs(&devinfo->sense_urbs);
791 usb_kill_anchored_urbs(&devinfo->data_urbs);
792 uas_zap_pending(devinfo, DID_RESET);
793
794 err = usb_reset_device(udev);
795
796 spin_lock_irqsave(&devinfo->lock, flags);
797 devinfo->resetting = 0;
798 spin_unlock_irqrestore(&devinfo->lock, flags);
799
800 usb_unlock_device(udev);
801
802 if (err) {
803 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
804 __func__, err);
805 return FAILED;
806 }
807
808 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
809 return SUCCESS;
810 }
811
812 static int uas_target_alloc(struct scsi_target *starget)
813 {
814 struct uas_dev_info *devinfo = (struct uas_dev_info *)
815 dev_to_shost(starget->dev.parent)->hostdata;
816
817 if (devinfo->flags & US_FL_NO_REPORT_LUNS)
818 starget->no_report_luns = 1;
819
820 return 0;
821 }
822
823 static int uas_slave_alloc(struct scsi_device *sdev)
824 {
825 struct uas_dev_info *devinfo =
826 (struct uas_dev_info *)sdev->host->hostdata;
827
828 sdev->hostdata = devinfo;
829
830 /*
831 * The protocol has no requirements on alignment in the strict sense.
832 * Controllers may or may not have alignment restrictions.
833 * As this is not exported, we use an extremely conservative guess.
834 */
835 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
836
837 if (devinfo->flags & US_FL_MAX_SECTORS_64)
838 blk_queue_max_hw_sectors(sdev->request_queue, 64);
839 else if (devinfo->flags & US_FL_MAX_SECTORS_240)
840 blk_queue_max_hw_sectors(sdev->request_queue, 240);
841
842 return 0;
843 }
844
845 static int uas_slave_configure(struct scsi_device *sdev)
846 {
847 struct uas_dev_info *devinfo = sdev->hostdata;
848
849 if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
850 sdev->no_report_opcodes = 1;
851
852 /* A few buggy USB-ATA bridges don't understand FUA */
853 if (devinfo->flags & US_FL_BROKEN_FUA)
854 sdev->broken_fua = 1;
855
856 /* UAS also needs to support FL_ALWAYS_SYNC */
857 if (devinfo->flags & US_FL_ALWAYS_SYNC) {
858 sdev->skip_ms_page_3f = 1;
859 sdev->skip_ms_page_8 = 1;
860 sdev->wce_default_on = 1;
861 }
862
863 /* Some disks cannot handle READ_CAPACITY_16 */
864 if (devinfo->flags & US_FL_NO_READ_CAPACITY_16)
865 sdev->no_read_capacity_16 = 1;
866
867 /*
868 * Some disks return the total number of blocks in response
869 * to READ CAPACITY rather than the highest block number.
870 * If this device makes that mistake, tell the sd driver.
871 */
872 if (devinfo->flags & US_FL_FIX_CAPACITY)
873 sdev->fix_capacity = 1;
874
875 /*
876 * in some cases we have to guess
877 */
878 if (devinfo->flags & US_FL_CAPACITY_HEURISTICS)
879 sdev->guess_capacity = 1;
880
881 /*
882 * Some devices don't like MODE SENSE with page=0x3f,
883 * which is the command used for checking if a device
884 * is write-protected. Now that we tell the sd driver
885 * to do a 192-byte transfer with this command the
886 * majority of devices work fine, but a few still can't
887 * handle it. The sd driver will simply assume those
888 * devices are write-enabled.
889 */
890 if (devinfo->flags & US_FL_NO_WP_DETECT)
891 sdev->skip_ms_page_3f = 1;
892
893 scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
894 return 0;
895 }
896
897 static struct scsi_host_template uas_host_template = {
898 .module = THIS_MODULE,
899 .name = "uas",
900 .queuecommand = uas_queuecommand,
901 .target_alloc = uas_target_alloc,
902 .slave_alloc = uas_slave_alloc,
903 .slave_configure = uas_slave_configure,
904 .eh_abort_handler = uas_eh_abort_handler,
905 .eh_device_reset_handler = uas_eh_device_reset_handler,
906 .this_id = -1,
907 .sg_tablesize = SG_NONE,
908 .skip_settle_delay = 1,
909 };
910
911 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
912 vendorName, productName, useProtocol, useTransport, \
913 initFunction, flags) \
914 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
915 .driver_info = (flags) }
916
917 static struct usb_device_id uas_usb_ids[] = {
918 # include "unusual_uas.h"
919 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
920 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
921 { }
922 };
923 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
924
925 #undef UNUSUAL_DEV
926
927 static int uas_switch_interface(struct usb_device *udev,
928 struct usb_interface *intf)
929 {
930 struct usb_host_interface *alt;
931
932 alt = uas_find_uas_alt_setting(intf);
933 if (!alt)
934 return -ENODEV;
935
936 return usb_set_interface(udev, alt->desc.bInterfaceNumber,
937 alt->desc.bAlternateSetting);
938 }
939
940 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
941 {
942 struct usb_host_endpoint *eps[4] = { };
943 struct usb_device *udev = devinfo->udev;
944 int r;
945
946 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
947 if (r)
948 return r;
949
950 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
951 usb_endpoint_num(&eps[0]->desc));
952 devinfo->status_pipe = usb_rcvbulkpipe(udev,
953 usb_endpoint_num(&eps[1]->desc));
954 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
955 usb_endpoint_num(&eps[2]->desc));
956 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
957 usb_endpoint_num(&eps[3]->desc));
958
959 if (udev->speed < USB_SPEED_SUPER) {
960 devinfo->qdepth = 32;
961 devinfo->use_streams = 0;
962 } else {
963 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
964 3, MAX_CMNDS, GFP_NOIO);
965 if (devinfo->qdepth < 0)
966 return devinfo->qdepth;
967 devinfo->use_streams = 1;
968 }
969
970 return 0;
971 }
972
973 static void uas_free_streams(struct uas_dev_info *devinfo)
974 {
975 struct usb_device *udev = devinfo->udev;
976 struct usb_host_endpoint *eps[3];
977
978 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
979 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
980 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
981 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
982 }
983
984 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
985 {
986 int result = -ENOMEM;
987 struct Scsi_Host *shost = NULL;
988 struct uas_dev_info *devinfo;
989 struct usb_device *udev = interface_to_usbdev(intf);
990 unsigned long dev_flags;
991
992 if (!uas_use_uas_driver(intf, id, &dev_flags))
993 return -ENODEV;
994
995 if (uas_switch_interface(udev, intf))
996 return -ENODEV;
997
998 shost = scsi_host_alloc(&uas_host_template,
999 sizeof(struct uas_dev_info));
1000 if (!shost)
1001 goto set_alt0;
1002
1003 shost->max_cmd_len = 16 + 252;
1004 shost->max_id = 1;
1005 shost->max_lun = 256;
1006 shost->max_channel = 0;
1007 shost->sg_tablesize = udev->bus->sg_tablesize;
1008
1009 devinfo = (struct uas_dev_info *)shost->hostdata;
1010 devinfo->intf = intf;
1011 devinfo->udev = udev;
1012 devinfo->resetting = 0;
1013 devinfo->shutdown = 0;
1014 devinfo->flags = dev_flags;
1015 init_usb_anchor(&devinfo->cmd_urbs);
1016 init_usb_anchor(&devinfo->sense_urbs);
1017 init_usb_anchor(&devinfo->data_urbs);
1018 spin_lock_init(&devinfo->lock);
1019 INIT_WORK(&devinfo->work, uas_do_work);
1020 INIT_WORK(&devinfo->scan_work, uas_scan_work);
1021
1022 result = uas_configure_endpoints(devinfo);
1023 if (result)
1024 goto set_alt0;
1025
1026 /*
1027 * 1 tag is reserved for untagged commands +
1028 * 1 tag to avoid off by one errors in some bridge firmwares
1029 */
1030 shost->can_queue = devinfo->qdepth - 2;
1031
1032 usb_set_intfdata(intf, shost);
1033 result = scsi_add_host(shost, &intf->dev);
1034 if (result)
1035 goto free_streams;
1036
1037 /* Submit the delayed_work for SCSI-device scanning */
1038 schedule_work(&devinfo->scan_work);
1039
1040 return result;
1041
1042 free_streams:
1043 uas_free_streams(devinfo);
1044 usb_set_intfdata(intf, NULL);
1045 set_alt0:
1046 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1047 if (shost)
1048 scsi_host_put(shost);
1049 return result;
1050 }
1051
1052 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
1053 {
1054 unsigned long flags;
1055 int i, r = 1;
1056
1057 spin_lock_irqsave(&devinfo->lock, flags);
1058
1059 for (i = 0; i < devinfo->qdepth; i++) {
1060 if (devinfo->cmnd[i]) {
1061 r = 0; /* Not empty */
1062 break;
1063 }
1064 }
1065
1066 spin_unlock_irqrestore(&devinfo->lock, flags);
1067
1068 return r;
1069 }
1070
1071 /*
1072 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1073 * get empty while there still is more work to do due to sense-urbs completing
1074 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1075 */
1076 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1077 {
1078 unsigned long start_time;
1079 int r;
1080
1081 start_time = jiffies;
1082 do {
1083 flush_work(&devinfo->work);
1084
1085 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1086 if (r == 0)
1087 return -ETIME;
1088
1089 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1090 if (r == 0)
1091 return -ETIME;
1092
1093 if (time_after(jiffies, start_time + 5 * HZ))
1094 return -ETIME;
1095 } while (!uas_cmnd_list_empty(devinfo));
1096
1097 return 0;
1098 }
1099
1100 static int uas_pre_reset(struct usb_interface *intf)
1101 {
1102 struct Scsi_Host *shost = usb_get_intfdata(intf);
1103 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1104 unsigned long flags;
1105
1106 if (devinfo->shutdown)
1107 return 0;
1108
1109 /* Block new requests */
1110 spin_lock_irqsave(shost->host_lock, flags);
1111 scsi_block_requests(shost);
1112 spin_unlock_irqrestore(shost->host_lock, flags);
1113
1114 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1115 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1116 scsi_unblock_requests(shost);
1117 return 1;
1118 }
1119
1120 uas_free_streams(devinfo);
1121
1122 return 0;
1123 }
1124
1125 static int uas_post_reset(struct usb_interface *intf)
1126 {
1127 struct Scsi_Host *shost = usb_get_intfdata(intf);
1128 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1129 unsigned long flags;
1130 int err;
1131
1132 if (devinfo->shutdown)
1133 return 0;
1134
1135 err = uas_configure_endpoints(devinfo);
1136 if (err && err != -ENODEV)
1137 shost_printk(KERN_ERR, shost,
1138 "%s: alloc streams error %d after reset",
1139 __func__, err);
1140
1141 /* we must unblock the host in every case lest we deadlock */
1142 spin_lock_irqsave(shost->host_lock, flags);
1143 scsi_report_bus_reset(shost, 0);
1144 spin_unlock_irqrestore(shost->host_lock, flags);
1145
1146 scsi_unblock_requests(shost);
1147
1148 return err ? 1 : 0;
1149 }
1150
1151 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1152 {
1153 struct Scsi_Host *shost = usb_get_intfdata(intf);
1154 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1155
1156 if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1157 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1158 return -ETIME;
1159 }
1160
1161 return 0;
1162 }
1163
1164 static int uas_resume(struct usb_interface *intf)
1165 {
1166 return 0;
1167 }
1168
1169 static int uas_reset_resume(struct usb_interface *intf)
1170 {
1171 struct Scsi_Host *shost = usb_get_intfdata(intf);
1172 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1173 unsigned long flags;
1174 int err;
1175
1176 err = uas_configure_endpoints(devinfo);
1177 if (err) {
1178 shost_printk(KERN_ERR, shost,
1179 "%s: alloc streams error %d after reset",
1180 __func__, err);
1181 return -EIO;
1182 }
1183
1184 spin_lock_irqsave(shost->host_lock, flags);
1185 scsi_report_bus_reset(shost, 0);
1186 spin_unlock_irqrestore(shost->host_lock, flags);
1187
1188 return 0;
1189 }
1190
1191 static void uas_disconnect(struct usb_interface *intf)
1192 {
1193 struct Scsi_Host *shost = usb_get_intfdata(intf);
1194 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1195 unsigned long flags;
1196
1197 spin_lock_irqsave(&devinfo->lock, flags);
1198 devinfo->resetting = 1;
1199 spin_unlock_irqrestore(&devinfo->lock, flags);
1200
1201 cancel_work_sync(&devinfo->work);
1202 usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1203 usb_kill_anchored_urbs(&devinfo->sense_urbs);
1204 usb_kill_anchored_urbs(&devinfo->data_urbs);
1205 uas_zap_pending(devinfo, DID_NO_CONNECT);
1206
1207 /*
1208 * Prevent SCSI scanning (if it hasn't started yet)
1209 * or wait for the SCSI-scanning routine to stop.
1210 */
1211 cancel_work_sync(&devinfo->scan_work);
1212
1213 scsi_remove_host(shost);
1214 uas_free_streams(devinfo);
1215 scsi_host_put(shost);
1216 }
1217
1218 /*
1219 * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1220 * hang on reboot when the device is still in uas mode. Note the reset is
1221 * necessary as some devices won't revert to usb-storage mode without it.
1222 */
1223 static void uas_shutdown(struct device *dev)
1224 {
1225 struct usb_interface *intf = to_usb_interface(dev);
1226 struct usb_device *udev = interface_to_usbdev(intf);
1227 struct Scsi_Host *shost = usb_get_intfdata(intf);
1228 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1229
1230 if (system_state != SYSTEM_RESTART)
1231 return;
1232
1233 devinfo->shutdown = 1;
1234 uas_free_streams(devinfo);
1235 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1236 usb_reset_device(udev);
1237 }
1238
1239 static struct usb_driver uas_driver = {
1240 .name = "uas",
1241 .probe = uas_probe,
1242 .disconnect = uas_disconnect,
1243 .pre_reset = uas_pre_reset,
1244 .post_reset = uas_post_reset,
1245 .suspend = uas_suspend,
1246 .resume = uas_resume,
1247 .reset_resume = uas_reset_resume,
1248 .drvwrap.driver.shutdown = uas_shutdown,
1249 .id_table = uas_usb_ids,
1250 };
1251
1252 static int __init uas_init(void)
1253 {
1254 int rv;
1255
1256 workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0);
1257 if (!workqueue)
1258 return -ENOMEM;
1259
1260 rv = usb_register(&uas_driver);
1261 if (rv) {
1262 destroy_workqueue(workqueue);
1263 return -ENOMEM;
1264 }
1265
1266 return 0;
1267 }
1268
1269 static void __exit uas_exit(void)
1270 {
1271 usb_deregister(&uas_driver);
1272 destroy_workqueue(workqueue);
1273 }
1274
1275 module_init(uas_init);
1276 module_exit(uas_exit);
1277
1278 MODULE_LICENSE("GPL");
1279 MODULE_AUTHOR(
1280 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp");
Linux with added FPC-III support