Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * sr.c Copyright (C) 1992 David Giller | |
4 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale | |
5 | * | |
6 | * adapted from: | |
7 | * sd.c Copyright (C) 1992 Drew Eckhardt | |
8 | * Linux scsi disk driver by | |
9 | * Drew Eckhardt <drew@colorado.edu> | |
10 | * | |
11 | * Modified by Eric Youngdale ericy@andante.org to | |
12 | * add scatter-gather, multiple outstanding request, and other | |
13 | * enhancements. | |
14 | * | |
15 | * Modified by Eric Youngdale eric@andante.org to support loadable | |
16 | * low-level scsi drivers. | |
17 | * | |
18 | * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to | |
19 | * provide auto-eject. | |
20 | * | |
21 | * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the | |
22 | * generic cdrom interface | |
23 | * | |
24 | * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() | |
25 | * interface, capabilities probe additions, ioctl cleanups, etc. | |
26 | * | |
27 | * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs | |
28 | * | |
29 | * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM | |
30 | * transparently and lose the GHOST hack | |
31 | * | |
32 | * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
33 | * check resource allocation in sr_init and some cleanups | |
34 | */ | |
35 | ||
36 | #include <linux/module.h> | |
37 | #include <linux/fs.h> | |
38 | #include <linux/kernel.h> | |
1da177e4 LT |
39 | #include <linux/mm.h> |
40 | #include <linux/bio.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/errno.h> | |
43 | #include <linux/cdrom.h> | |
44 | #include <linux/interrupt.h> | |
45 | #include <linux/init.h> | |
46 | #include <linux/blkdev.h> | |
bca6b067 | 47 | #include <linux/blk-pm.h> |
0b950672 | 48 | #include <linux/mutex.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
6c7f1e2f | 50 | #include <linux/pm_runtime.h> |
7c0f6ba6 | 51 | #include <linux/uaccess.h> |
1da177e4 LT |
52 | |
53 | #include <scsi/scsi.h> | |
54 | #include <scsi/scsi_dbg.h> | |
55 | #include <scsi/scsi_device.h> | |
56 | #include <scsi/scsi_driver.h> | |
820732b5 | 57 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
58 | #include <scsi/scsi_eh.h> |
59 | #include <scsi/scsi_host.h> | |
60 | #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ | |
1da177e4 LT |
61 | |
62 | #include "scsi_logging.h" | |
63 | #include "sr.h" | |
64 | ||
65 | ||
f018fa55 RH |
66 | MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); |
67 | MODULE_LICENSE("GPL"); | |
68 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); | |
d7b8bcb0 MT |
69 | MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); |
70 | MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); | |
f018fa55 | 71 | |
1da177e4 LT |
72 | #define SR_DISKS 256 |
73 | ||
1da177e4 LT |
74 | #define SR_CAPABILITIES \ |
75 | (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ | |
76 | CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ | |
6a2900b6 | 77 | CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ |
1da177e4 LT |
78 | CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ |
79 | CDC_MRW|CDC_MRW_W|CDC_RAM) | |
80 | ||
2a48fc0a | 81 | static DEFINE_MUTEX(sr_mutex); |
1da177e4 LT |
82 | static int sr_probe(struct device *); |
83 | static int sr_remove(struct device *); | |
159b2cbf | 84 | static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); |
7b3d9545 | 85 | static int sr_done(struct scsi_cmnd *); |
6c7f1e2f AL |
86 | static int sr_runtime_suspend(struct device *dev); |
87 | ||
a816b4c6 | 88 | static const struct dev_pm_ops sr_pm_ops = { |
6c7f1e2f AL |
89 | .runtime_suspend = sr_runtime_suspend, |
90 | }; | |
1da177e4 LT |
91 | |
92 | static struct scsi_driver sr_template = { | |
1da177e4 LT |
93 | .gendrv = { |
94 | .name = "sr", | |
3af6b352 | 95 | .owner = THIS_MODULE, |
1da177e4 LT |
96 | .probe = sr_probe, |
97 | .remove = sr_remove, | |
6c7f1e2f | 98 | .pm = &sr_pm_ops, |
1da177e4 | 99 | }, |
a1b73fc1 | 100 | .init_command = sr_init_command, |
7b3d9545 | 101 | .done = sr_done, |
1da177e4 LT |
102 | }; |
103 | ||
104 | static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; | |
105 | static DEFINE_SPINLOCK(sr_index_lock); | |
106 | ||
107 | /* This semaphore is used to mediate the 0->1 reference get in the | |
108 | * face of object destruction (i.e. we can't allow a get on an | |
109 | * object after last put) */ | |
0b950672 | 110 | static DEFINE_MUTEX(sr_ref_mutex); |
1da177e4 LT |
111 | |
112 | static int sr_open(struct cdrom_device_info *, int); | |
113 | static void sr_release(struct cdrom_device_info *); | |
114 | ||
115 | static void get_sectorsize(struct scsi_cd *); | |
116 | static void get_capabilities(struct scsi_cd *); | |
117 | ||
93aae17a TH |
118 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
119 | unsigned int clearing, int slot); | |
1da177e4 LT |
120 | static int sr_packet(struct cdrom_device_info *, struct packet_command *); |
121 | ||
853fe1bf | 122 | static const struct cdrom_device_ops sr_dops = { |
1da177e4 LT |
123 | .open = sr_open, |
124 | .release = sr_release, | |
125 | .drive_status = sr_drive_status, | |
93aae17a | 126 | .check_events = sr_check_events, |
1da177e4 LT |
127 | .tray_move = sr_tray_move, |
128 | .lock_door = sr_lock_door, | |
129 | .select_speed = sr_select_speed, | |
130 | .get_last_session = sr_get_last_session, | |
131 | .get_mcn = sr_get_mcn, | |
132 | .reset = sr_reset, | |
133 | .audio_ioctl = sr_audio_ioctl, | |
1da177e4 LT |
134 | .capability = SR_CAPABILITIES, |
135 | .generic_packet = sr_packet, | |
136 | }; | |
137 | ||
138 | static void sr_kref_release(struct kref *kref); | |
139 | ||
140 | static inline struct scsi_cd *scsi_cd(struct gendisk *disk) | |
141 | { | |
142 | return container_of(disk->private_data, struct scsi_cd, driver); | |
143 | } | |
144 | ||
6c7f1e2f AL |
145 | static int sr_runtime_suspend(struct device *dev) |
146 | { | |
147 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
148 | ||
13b43891 AS |
149 | if (!cd) /* E.g.: runtime suspend following sr_remove() */ |
150 | return 0; | |
151 | ||
6c7f1e2f AL |
152 | if (cd->media_present) |
153 | return -EBUSY; | |
154 | else | |
155 | return 0; | |
156 | } | |
157 | ||
1da177e4 LT |
158 | /* |
159 | * The get and put routines for the struct scsi_cd. Note this entity | |
160 | * has a scsi_device pointer and owns a reference to this. | |
161 | */ | |
162 | static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) | |
163 | { | |
164 | struct scsi_cd *cd = NULL; | |
165 | ||
0b950672 | 166 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
167 | if (disk->private_data == NULL) |
168 | goto out; | |
169 | cd = scsi_cd(disk); | |
170 | kref_get(&cd->kref); | |
6627b38f AL |
171 | if (scsi_device_get(cd->device)) { |
172 | kref_put(&cd->kref, sr_kref_release); | |
173 | cd = NULL; | |
174 | } | |
1da177e4 | 175 | out: |
0b950672 | 176 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
177 | return cd; |
178 | } | |
179 | ||
858119e1 | 180 | static void scsi_cd_put(struct scsi_cd *cd) |
1da177e4 LT |
181 | { |
182 | struct scsi_device *sdev = cd->device; | |
183 | ||
0b950672 | 184 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
185 | kref_put(&cd->kref, sr_kref_release); |
186 | scsi_device_put(sdev); | |
0b950672 | 187 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
188 | } |
189 | ||
93aae17a TH |
190 | static unsigned int sr_get_events(struct scsi_device *sdev) |
191 | { | |
192 | u8 buf[8]; | |
193 | u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, | |
194 | 1, /* polled */ | |
195 | 0, 0, /* reserved */ | |
196 | 1 << 4, /* notification class: media */ | |
197 | 0, 0, /* reserved */ | |
198 | 0, sizeof(buf), /* allocation length */ | |
199 | 0, /* control */ | |
200 | }; | |
201 | struct event_header *eh = (void *)buf; | |
202 | struct media_event_desc *med = (void *)(buf + 4); | |
203 | struct scsi_sense_hdr sshdr; | |
204 | int result; | |
205 | ||
206 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), | |
207 | &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); | |
208 | if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) | |
209 | return DISK_EVENT_MEDIA_CHANGE; | |
210 | ||
211 | if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) | |
212 | return 0; | |
213 | ||
214 | if (eh->nea || eh->notification_class != 0x4) | |
215 | return 0; | |
216 | ||
217 | if (med->media_event_code == 1) | |
218 | return DISK_EVENT_EJECT_REQUEST; | |
219 | else if (med->media_event_code == 2) | |
220 | return DISK_EVENT_MEDIA_CHANGE; | |
221 | return 0; | |
222 | } | |
223 | ||
1da177e4 | 224 | /* |
93aae17a TH |
225 | * This function checks to see if the media has been changed or eject |
226 | * button has been pressed. It is possible that we have already | |
227 | * sensed a change, or the drive may have sensed one and not yet | |
228 | * reported it. The past events are accumulated in sdev->changed and | |
229 | * returned together with the current state. | |
1da177e4 | 230 | */ |
93aae17a TH |
231 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
232 | unsigned int clearing, int slot) | |
1da177e4 LT |
233 | { |
234 | struct scsi_cd *cd = cdi->handle; | |
93aae17a TH |
235 | bool last_present; |
236 | struct scsi_sense_hdr sshdr; | |
237 | unsigned int events; | |
238 | int ret; | |
1da177e4 | 239 | |
93aae17a TH |
240 | /* no changer support */ |
241 | if (CDSL_CURRENT != slot) | |
242 | return 0; | |
243 | ||
244 | events = sr_get_events(cd->device); | |
79b9677d KS |
245 | cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; |
246 | ||
247 | /* | |
248 | * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree | |
249 | * for several times in a row. We rely on TUR only for this likely | |
250 | * broken device, to prevent generating incorrect media changed | |
251 | * events for every open(). | |
252 | */ | |
253 | if (cd->ignore_get_event) { | |
254 | events &= ~DISK_EVENT_MEDIA_CHANGE; | |
255 | goto do_tur; | |
256 | } | |
257 | ||
93aae17a TH |
258 | /* |
259 | * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE | |
260 | * is being cleared. Note that there are devices which hang | |
261 | * if asked to execute TUR repeatedly. | |
262 | */ | |
79b9677d KS |
263 | if (cd->device->changed) { |
264 | events |= DISK_EVENT_MEDIA_CHANGE; | |
265 | cd->device->changed = 0; | |
266 | cd->tur_changed = true; | |
267 | } | |
93aae17a | 268 | |
79b9677d KS |
269 | if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) |
270 | return events; | |
271 | do_tur: | |
93aae17a TH |
272 | /* let's see whether the media is there with TUR */ |
273 | last_present = cd->media_present; | |
274 | ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); | |
1da177e4 | 275 | |
638428ec TH |
276 | /* |
277 | * Media is considered to be present if TUR succeeds or fails with | |
278 | * sense data indicating something other than media-not-present | |
279 | * (ASC 0x3a). | |
280 | */ | |
93aae17a TH |
281 | cd->media_present = scsi_status_is_good(ret) || |
282 | (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); | |
1da177e4 | 283 | |
93aae17a | 284 | if (last_present != cd->media_present) |
79b9677d KS |
285 | cd->device->changed = 1; |
286 | ||
93aae17a TH |
287 | if (cd->device->changed) { |
288 | events |= DISK_EVENT_MEDIA_CHANGE; | |
289 | cd->device->changed = 0; | |
79b9677d KS |
290 | cd->tur_changed = true; |
291 | } | |
292 | ||
293 | if (cd->ignore_get_event) | |
294 | return events; | |
295 | ||
296 | /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ | |
297 | if (!cd->tur_changed) { | |
298 | if (cd->get_event_changed) { | |
299 | if (cd->tur_mismatch++ > 8) { | |
96eefad2 HR |
300 | sr_printk(KERN_WARNING, cd, |
301 | "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); | |
79b9677d KS |
302 | cd->ignore_get_event = true; |
303 | } | |
304 | } else { | |
305 | cd->tur_mismatch = 0; | |
306 | } | |
1da177e4 | 307 | } |
79b9677d KS |
308 | cd->tur_changed = false; |
309 | cd->get_event_changed = false; | |
285e9670 | 310 | |
93aae17a | 311 | return events; |
1da177e4 | 312 | } |
93aae17a | 313 | |
1da177e4 | 314 | /* |
7b3d9545 | 315 | * sr_done is the interrupt routine for the device driver. |
1da177e4 | 316 | * |
7b3d9545 | 317 | * It will be notified on the end of a SCSI read / write, and will take one |
1da177e4 LT |
318 | * of several actions based on success or failure. |
319 | */ | |
7b3d9545 | 320 | static int sr_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
321 | { |
322 | int result = SCpnt->result; | |
30b0c37b | 323 | int this_count = scsi_bufflen(SCpnt); |
1da177e4 LT |
324 | int good_bytes = (result == 0 ? this_count : 0); |
325 | int block_sectors = 0; | |
326 | long error_sector; | |
327 | struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); | |
328 | ||
329 | #ifdef DEBUG | |
96eefad2 | 330 | scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); |
1da177e4 LT |
331 | #endif |
332 | ||
333 | /* | |
334 | * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial | |
335 | * success. Since this is a relatively rare error condition, no | |
336 | * care is taken to avoid unnecessary additional work such as | |
337 | * memcpy's that could be avoided. | |
338 | */ | |
339 | if (driver_byte(result) != 0 && /* An error occurred */ | |
340 | (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ | |
341 | switch (SCpnt->sense_buffer[2]) { | |
342 | case MEDIUM_ERROR: | |
343 | case VOLUME_OVERFLOW: | |
344 | case ILLEGAL_REQUEST: | |
345 | if (!(SCpnt->sense_buffer[0] & 0x90)) | |
346 | break; | |
1da177e4 LT |
347 | error_sector = (SCpnt->sense_buffer[3] << 24) | |
348 | (SCpnt->sense_buffer[4] << 16) | | |
349 | (SCpnt->sense_buffer[5] << 8) | | |
350 | SCpnt->sense_buffer[6]; | |
351 | if (SCpnt->request->bio != NULL) | |
352 | block_sectors = | |
353 | bio_sectors(SCpnt->request->bio); | |
354 | if (block_sectors < 4) | |
355 | block_sectors = 4; | |
356 | if (cd->device->sector_size == 2048) | |
357 | error_sector <<= 2; | |
358 | error_sector &= ~(block_sectors - 1); | |
83096ebf TH |
359 | good_bytes = (error_sector - |
360 | blk_rq_pos(SCpnt->request)) << 9; | |
1da177e4 LT |
361 | if (good_bytes < 0 || good_bytes >= this_count) |
362 | good_bytes = 0; | |
363 | /* | |
364 | * The SCSI specification allows for the value | |
365 | * returned by READ CAPACITY to be up to 75 2K | |
366 | * sectors past the last readable block. | |
367 | * Therefore, if we hit a medium error within the | |
368 | * last 75 2K sectors, we decrease the saved size | |
369 | * value. | |
370 | */ | |
371 | if (error_sector < get_capacity(cd->disk) && | |
372 | cd->capacity - error_sector < 4 * 75) | |
373 | set_capacity(cd->disk, error_sector); | |
374 | break; | |
375 | ||
376 | case RECOVERED_ERROR: | |
1da177e4 LT |
377 | good_bytes = this_count; |
378 | break; | |
379 | ||
380 | default: | |
381 | break; | |
382 | } | |
383 | } | |
384 | ||
7b3d9545 | 385 | return good_bytes; |
1da177e4 LT |
386 | } |
387 | ||
159b2cbf | 388 | static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt) |
1da177e4 | 389 | { |
242f9dcb | 390 | int block = 0, this_count, s_size; |
7f9a6bc4 | 391 | struct scsi_cd *cd; |
a1b73fc1 | 392 | struct request *rq = SCpnt->request; |
159b2cbf | 393 | blk_status_t ret; |
7f9a6bc4 | 394 | |
3c356bde | 395 | ret = scsi_init_io(SCpnt); |
159b2cbf | 396 | if (ret != BLK_STS_OK) |
7f9a6bc4 | 397 | goto out; |
7f9a6bc4 JB |
398 | cd = scsi_cd(rq->rq_disk); |
399 | ||
400 | /* from here on until we're complete, any goto out | |
401 | * is used for a killable error condition */ | |
159b2cbf | 402 | ret = BLK_STS_IOERR; |
1da177e4 | 403 | |
96eefad2 HR |
404 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
405 | "Doing sr request, block = %d\n", block)); | |
1da177e4 LT |
406 | |
407 | if (!cd->device || !scsi_device_online(cd->device)) { | |
96eefad2 HR |
408 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
409 | "Finishing %u sectors\n", blk_rq_sectors(rq))); | |
410 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, | |
411 | "Retry with 0x%p\n", SCpnt)); | |
7f9a6bc4 | 412 | goto out; |
1da177e4 LT |
413 | } |
414 | ||
415 | if (cd->device->changed) { | |
416 | /* | |
417 | * quietly refuse to do anything to a changed disc until the | |
418 | * changed bit has been reset | |
419 | */ | |
7f9a6bc4 | 420 | goto out; |
1da177e4 LT |
421 | } |
422 | ||
1da177e4 LT |
423 | /* |
424 | * we do lazy blocksize switching (when reading XA sectors, | |
425 | * see CDROMREADMODE2 ioctl) | |
426 | */ | |
427 | s_size = cd->device->sector_size; | |
428 | if (s_size > 2048) { | |
429 | if (!in_interrupt()) | |
430 | sr_set_blocklength(cd, 2048); | |
431 | else | |
96eefad2 HR |
432 | scmd_printk(KERN_INFO, SCpnt, |
433 | "can't switch blocksize: in interrupt\n"); | |
1da177e4 LT |
434 | } |
435 | ||
436 | if (s_size != 512 && s_size != 1024 && s_size != 2048) { | |
3bf743e7 | 437 | scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); |
7f9a6bc4 | 438 | goto out; |
1da177e4 LT |
439 | } |
440 | ||
aebf526b CH |
441 | switch (req_op(rq)) { |
442 | case REQ_OP_WRITE: | |
fd2eb903 | 443 | if (!cd->writeable) |
7f9a6bc4 | 444 | goto out; |
1da177e4 | 445 | SCpnt->cmnd[0] = WRITE_10; |
96eefad2 | 446 | cd->cdi.media_written = 1; |
aebf526b CH |
447 | break; |
448 | case REQ_OP_READ: | |
1da177e4 | 449 | SCpnt->cmnd[0] = READ_10; |
aebf526b CH |
450 | break; |
451 | default: | |
7f9a6bc4 JB |
452 | blk_dump_rq_flags(rq, "Unknown sr command"); |
453 | goto out; | |
1da177e4 LT |
454 | } |
455 | ||
456 | { | |
30b0c37b BH |
457 | struct scatterlist *sg; |
458 | int i, size = 0, sg_count = scsi_sg_count(SCpnt); | |
1da177e4 | 459 | |
30b0c37b BH |
460 | scsi_for_each_sg(SCpnt, sg, sg_count, i) |
461 | size += sg->length; | |
462 | ||
463 | if (size != scsi_bufflen(SCpnt)) { | |
3bf743e7 JG |
464 | scmd_printk(KERN_ERR, SCpnt, |
465 | "mismatch count %d, bytes %d\n", | |
30b0c37b BH |
466 | size, scsi_bufflen(SCpnt)); |
467 | if (scsi_bufflen(SCpnt) > size) | |
468 | SCpnt->sdb.length = size; | |
1da177e4 LT |
469 | } |
470 | } | |
471 | ||
472 | /* | |
473 | * request doesn't start on hw block boundary, add scatter pads | |
474 | */ | |
83096ebf | 475 | if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || |
30b0c37b | 476 | (scsi_bufflen(SCpnt) % s_size)) { |
3bf743e7 | 477 | scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); |
7f9a6bc4 | 478 | goto out; |
1da177e4 LT |
479 | } |
480 | ||
30b0c37b | 481 | this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); |
1da177e4 LT |
482 | |
483 | ||
96eefad2 HR |
484 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
485 | "%s %d/%u 512 byte blocks.\n", | |
486 | (rq_data_dir(rq) == WRITE) ? | |
1da177e4 | 487 | "writing" : "reading", |
96eefad2 | 488 | this_count, blk_rq_sectors(rq))); |
1da177e4 LT |
489 | |
490 | SCpnt->cmnd[1] = 0; | |
83096ebf | 491 | block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); |
1da177e4 LT |
492 | |
493 | if (this_count > 0xffff) { | |
494 | this_count = 0xffff; | |
30b0c37b | 495 | SCpnt->sdb.length = this_count * s_size; |
1da177e4 LT |
496 | } |
497 | ||
498 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; | |
499 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
500 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
501 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
502 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
503 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
504 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
505 | ||
506 | /* | |
507 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
508 | * host adapter, it's safe to assume that we can at least transfer | |
509 | * this many bytes between each connect / disconnect. | |
510 | */ | |
511 | SCpnt->transfersize = cd->device->sector_size; | |
512 | SCpnt->underflow = this_count << 9; | |
1da177e4 | 513 | SCpnt->allowed = MAX_RETRIES; |
1da177e4 | 514 | |
1da177e4 LT |
515 | /* |
516 | * This indicates that the command is ready from our end to be | |
517 | * queued. | |
518 | */ | |
159b2cbf | 519 | ret = BLK_STS_OK; |
7f9a6bc4 | 520 | out: |
a1b73fc1 | 521 | return ret; |
1da177e4 LT |
522 | } |
523 | ||
40cc51be | 524 | static int sr_block_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 525 | { |
6e9624b8 | 526 | struct scsi_cd *cd; |
1214fd7b | 527 | struct scsi_device *sdev; |
40cc51be | 528 | int ret = -ENXIO; |
1da177e4 | 529 | |
1214fd7b BVA |
530 | cd = scsi_cd_get(bdev->bd_disk); |
531 | if (!cd) | |
532 | goto out; | |
533 | ||
534 | sdev = cd->device; | |
535 | scsi_autopm_get_device(sdev); | |
2bbea6e1 ML |
536 | check_disk_change(bdev); |
537 | ||
2a48fc0a | 538 | mutex_lock(&sr_mutex); |
1214fd7b | 539 | ret = cdrom_open(&cd->cdi, bdev, mode); |
2a48fc0a | 540 | mutex_unlock(&sr_mutex); |
1214fd7b BVA |
541 | |
542 | scsi_autopm_put_device(sdev); | |
543 | if (ret) | |
544 | scsi_cd_put(cd); | |
545 | ||
546 | out: | |
1da177e4 LT |
547 | return ret; |
548 | } | |
549 | ||
db2a144b | 550 | static void sr_block_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 551 | { |
40cc51be | 552 | struct scsi_cd *cd = scsi_cd(disk); |
2a48fc0a | 553 | mutex_lock(&sr_mutex); |
40cc51be | 554 | cdrom_release(&cd->cdi, mode); |
1da177e4 | 555 | scsi_cd_put(cd); |
2a48fc0a | 556 | mutex_unlock(&sr_mutex); |
1da177e4 LT |
557 | } |
558 | ||
40cc51be | 559 | static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
1da177e4 LT |
560 | unsigned long arg) |
561 | { | |
40cc51be | 562 | struct scsi_cd *cd = scsi_cd(bdev->bd_disk); |
1da177e4 | 563 | struct scsi_device *sdev = cd->device; |
6a2900b6 CH |
564 | void __user *argp = (void __user *)arg; |
565 | int ret; | |
1da177e4 | 566 | |
2a48fc0a | 567 | mutex_lock(&sr_mutex); |
8a6cfeb6 | 568 | |
906d15fb CH |
569 | ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, |
570 | (mode & FMODE_NDELAY) != 0); | |
571 | if (ret) | |
572 | goto out; | |
573 | ||
1214fd7b BVA |
574 | scsi_autopm_get_device(sdev); |
575 | ||
6a2900b6 CH |
576 | /* |
577 | * Send SCSI addressing ioctls directly to mid level, send other | |
578 | * ioctls to cdrom/block level. | |
579 | */ | |
580 | switch (cmd) { | |
581 | case SCSI_IOCTL_GET_IDLUN: | |
582 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
8a6cfeb6 | 583 | ret = scsi_ioctl(sdev, cmd, argp); |
1214fd7b | 584 | goto put; |
1da177e4 | 585 | } |
6a2900b6 | 586 | |
40cc51be | 587 | ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); |
6397256b | 588 | if (ret != -ENOSYS) |
1214fd7b | 589 | goto put; |
6a2900b6 | 590 | |
8a6cfeb6 AB |
591 | ret = scsi_ioctl(sdev, cmd, argp); |
592 | ||
1214fd7b BVA |
593 | put: |
594 | scsi_autopm_put_device(sdev); | |
595 | ||
8a6cfeb6 | 596 | out: |
2a48fc0a | 597 | mutex_unlock(&sr_mutex); |
8a6cfeb6 | 598 | return ret; |
1da177e4 LT |
599 | } |
600 | ||
93aae17a TH |
601 | static unsigned int sr_block_check_events(struct gendisk *disk, |
602 | unsigned int clearing) | |
1da177e4 | 603 | { |
2d097c50 JA |
604 | unsigned int ret = 0; |
605 | struct scsi_cd *cd; | |
6c7f1e2f | 606 | |
2d097c50 JA |
607 | cd = scsi_cd_get(disk); |
608 | if (!cd) | |
6627b38f | 609 | return 0; |
6c7f1e2f | 610 | |
2d097c50 JA |
611 | if (!atomic_read(&cd->device->disk_events_disable_depth)) |
612 | ret = cdrom_check_events(&cd->cdi, clearing); | |
613 | ||
614 | scsi_cd_put(cd); | |
615 | return ret; | |
93aae17a TH |
616 | } |
617 | ||
618 | static int sr_block_revalidate_disk(struct gendisk *disk) | |
619 | { | |
93aae17a | 620 | struct scsi_sense_hdr sshdr; |
2d097c50 JA |
621 | struct scsi_cd *cd; |
622 | ||
623 | cd = scsi_cd_get(disk); | |
624 | if (!cd) | |
625 | return -ENXIO; | |
93aae17a TH |
626 | |
627 | /* if the unit is not ready, nothing more to do */ | |
628 | if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) | |
6c7f1e2f | 629 | goto out; |
93aae17a TH |
630 | |
631 | sr_cd_check(&cd->cdi); | |
632 | get_sectorsize(cd); | |
6c7f1e2f | 633 | out: |
2d097c50 | 634 | scsi_cd_put(cd); |
93aae17a | 635 | return 0; |
1da177e4 LT |
636 | } |
637 | ||
83d5cde4 | 638 | static const struct block_device_operations sr_bdops = |
1da177e4 LT |
639 | { |
640 | .owner = THIS_MODULE, | |
40cc51be AV |
641 | .open = sr_block_open, |
642 | .release = sr_block_release, | |
8a6cfeb6 | 643 | .ioctl = sr_block_ioctl, |
93aae17a TH |
644 | .check_events = sr_block_check_events, |
645 | .revalidate_disk = sr_block_revalidate_disk, | |
1da177e4 LT |
646 | /* |
647 | * No compat_ioctl for now because sr_block_ioctl never | |
25985edc | 648 | * seems to pass arbitrary ioctls down to host drivers. |
1da177e4 LT |
649 | */ |
650 | }; | |
651 | ||
652 | static int sr_open(struct cdrom_device_info *cdi, int purpose) | |
653 | { | |
654 | struct scsi_cd *cd = cdi->handle; | |
655 | struct scsi_device *sdev = cd->device; | |
656 | int retval; | |
657 | ||
658 | /* | |
659 | * If the device is in error recovery, wait until it is done. | |
660 | * If the device is offline, then disallow any access to it. | |
661 | */ | |
662 | retval = -ENXIO; | |
663 | if (!scsi_block_when_processing_errors(sdev)) | |
664 | goto error_out; | |
665 | ||
1da177e4 LT |
666 | return 0; |
667 | ||
668 | error_out: | |
669 | return retval; | |
670 | } | |
671 | ||
672 | static void sr_release(struct cdrom_device_info *cdi) | |
673 | { | |
674 | struct scsi_cd *cd = cdi->handle; | |
675 | ||
676 | if (cd->device->sector_size > 2048) | |
677 | sr_set_blocklength(cd, 2048); | |
678 | ||
679 | } | |
680 | ||
681 | static int sr_probe(struct device *dev) | |
682 | { | |
683 | struct scsi_device *sdev = to_scsi_device(dev); | |
684 | struct gendisk *disk; | |
685 | struct scsi_cd *cd; | |
686 | int minor, error; | |
687 | ||
6fe8c1db | 688 | scsi_autopm_get_device(sdev); |
1da177e4 LT |
689 | error = -ENODEV; |
690 | if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) | |
691 | goto fail; | |
692 | ||
693 | error = -ENOMEM; | |
24669f75 | 694 | cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
1da177e4 LT |
695 | if (!cd) |
696 | goto fail; | |
1da177e4 LT |
697 | |
698 | kref_init(&cd->kref); | |
699 | ||
700 | disk = alloc_disk(1); | |
701 | if (!disk) | |
702 | goto fail_free; | |
703 | ||
704 | spin_lock(&sr_index_lock); | |
705 | minor = find_first_zero_bit(sr_index_bits, SR_DISKS); | |
706 | if (minor == SR_DISKS) { | |
707 | spin_unlock(&sr_index_lock); | |
708 | error = -EBUSY; | |
709 | goto fail_put; | |
710 | } | |
711 | __set_bit(minor, sr_index_bits); | |
712 | spin_unlock(&sr_index_lock); | |
713 | ||
714 | disk->major = SCSI_CDROM_MAJOR; | |
715 | disk->first_minor = minor; | |
716 | sprintf(disk->disk_name, "sr%d", minor); | |
717 | disk->fops = &sr_bdops; | |
d4dc210f | 718 | disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; |
93aae17a | 719 | disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; |
c92e2f04 | 720 | disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; |
1da177e4 | 721 | |
242f9dcb JA |
722 | blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); |
723 | ||
1da177e4 LT |
724 | cd->device = sdev; |
725 | cd->disk = disk; | |
726 | cd->driver = &sr_template; | |
727 | cd->disk = disk; | |
728 | cd->capacity = 0x1fffff; | |
1da177e4 | 729 | cd->device->changed = 1; /* force recheck CD type */ |
93aae17a | 730 | cd->media_present = 1; |
1da177e4 LT |
731 | cd->use = 1; |
732 | cd->readcd_known = 0; | |
733 | cd->readcd_cdda = 0; | |
734 | ||
735 | cd->cdi.ops = &sr_dops; | |
736 | cd->cdi.handle = cd; | |
737 | cd->cdi.mask = 0; | |
738 | cd->cdi.capacity = 1; | |
739 | sprintf(cd->cdi.name, "sr%d", minor); | |
740 | ||
741 | sdev->sector_size = 2048; /* A guess, just in case */ | |
742 | ||
743 | /* FIXME: need to handle a get_capabilities failure properly ?? */ | |
744 | get_capabilities(cd); | |
745 | sr_vendor_init(cd); | |
746 | ||
1da177e4 LT |
747 | set_capacity(disk, cd->capacity); |
748 | disk->private_data = &cd->driver; | |
749 | disk->queue = sdev->request_queue; | |
750 | cd->cdi.disk = disk; | |
751 | ||
752 | if (register_cdrom(&cd->cdi)) | |
753 | goto fail_put; | |
754 | ||
6627b38f AL |
755 | /* |
756 | * Initialize block layer runtime PM stuffs before the | |
757 | * periodic event checking request gets started in add_disk. | |
758 | */ | |
759 | blk_pm_runtime_init(sdev->request_queue, dev); | |
760 | ||
1da177e4 LT |
761 | dev_set_drvdata(dev, cd); |
762 | disk->flags |= GENHD_FL_REMOVABLE; | |
fef912bf | 763 | device_add_disk(&sdev->sdev_gendev, disk, NULL); |
1da177e4 | 764 | |
9ccfc756 JB |
765 | sdev_printk(KERN_DEBUG, sdev, |
766 | "Attached scsi CD-ROM %s\n", cd->cdi.name); | |
6c7f1e2f AL |
767 | scsi_autopm_put_device(cd->device); |
768 | ||
1da177e4 LT |
769 | return 0; |
770 | ||
771 | fail_put: | |
772 | put_disk(disk); | |
773 | fail_free: | |
774 | kfree(cd); | |
775 | fail: | |
6fe8c1db | 776 | scsi_autopm_put_device(sdev); |
1da177e4 LT |
777 | return error; |
778 | } | |
779 | ||
780 | ||
781 | static void get_sectorsize(struct scsi_cd *cd) | |
782 | { | |
783 | unsigned char cmd[10]; | |
62858dac | 784 | unsigned char buffer[8]; |
1da177e4 LT |
785 | int the_result, retries = 3; |
786 | int sector_size; | |
165125e1 | 787 | struct request_queue *queue; |
1da177e4 | 788 | |
1da177e4 LT |
789 | do { |
790 | cmd[0] = READ_CAPACITY; | |
791 | memset((void *) &cmd[1], 0, 9); | |
62858dac | 792 | memset(buffer, 0, sizeof(buffer)); |
1da177e4 LT |
793 | |
794 | /* Do the command and wait.. */ | |
820732b5 | 795 | the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
62858dac | 796 | buffer, sizeof(buffer), NULL, |
f4f4e47e | 797 | SR_TIMEOUT, MAX_RETRIES, NULL); |
1da177e4 | 798 | |
1da177e4 LT |
799 | retries--; |
800 | ||
801 | } while (the_result && retries); | |
802 | ||
803 | ||
1da177e4 LT |
804 | if (the_result) { |
805 | cd->capacity = 0x1fffff; | |
806 | sector_size = 2048; /* A guess, just in case */ | |
1da177e4 | 807 | } else { |
5915136d TH |
808 | long last_written; |
809 | ||
810 | cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | | |
811 | (buffer[2] << 8) | buffer[3]); | |
812 | /* | |
813 | * READ_CAPACITY doesn't return the correct size on | |
814 | * certain UDF media. If last_written is larger, use | |
815 | * it instead. | |
816 | * | |
817 | * http://bugzilla.kernel.org/show_bug.cgi?id=9668 | |
818 | */ | |
819 | if (!cdrom_get_last_written(&cd->cdi, &last_written)) | |
820 | cd->capacity = max_t(long, cd->capacity, last_written); | |
821 | ||
1da177e4 LT |
822 | sector_size = (buffer[4] << 24) | |
823 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
824 | switch (sector_size) { | |
825 | /* | |
826 | * HP 4020i CD-Recorder reports 2340 byte sectors | |
827 | * Philips CD-Writers report 2352 byte sectors | |
828 | * | |
829 | * Use 2k sectors for them.. | |
830 | */ | |
831 | case 0: | |
832 | case 2340: | |
833 | case 2352: | |
834 | sector_size = 2048; | |
835 | /* fall through */ | |
836 | case 2048: | |
837 | cd->capacity *= 4; | |
838 | /* fall through */ | |
839 | case 512: | |
840 | break; | |
841 | default: | |
96eefad2 HR |
842 | sr_printk(KERN_INFO, cd, |
843 | "unsupported sector size %d.", sector_size); | |
1da177e4 | 844 | cd->capacity = 0; |
1da177e4 LT |
845 | } |
846 | ||
847 | cd->device->sector_size = sector_size; | |
848 | ||
849 | /* | |
850 | * Add this so that we have the ability to correctly gauge | |
851 | * what the device is capable of. | |
852 | */ | |
1da177e4 LT |
853 | set_capacity(cd->disk, cd->capacity); |
854 | } | |
855 | ||
856 | queue = cd->device->request_queue; | |
e1defc4f | 857 | blk_queue_logical_block_size(queue, sector_size); |
1da177e4 | 858 | |
62858dac | 859 | return; |
1da177e4 LT |
860 | } |
861 | ||
862 | static void get_capabilities(struct scsi_cd *cd) | |
863 | { | |
864 | unsigned char *buffer; | |
865 | struct scsi_mode_data data; | |
820732b5 | 866 | struct scsi_sense_hdr sshdr; |
a00a7862 | 867 | unsigned int ms_len = 128; |
38582a62 | 868 | int rc, n; |
1da177e4 | 869 | |
0ad78200 | 870 | static const char *loadmech[] = |
1da177e4 LT |
871 | { |
872 | "caddy", | |
873 | "tray", | |
874 | "pop-up", | |
875 | "", | |
876 | "changer", | |
877 | "cartridge changer", | |
878 | "", | |
879 | "" | |
880 | }; | |
881 | ||
1da177e4 LT |
882 | |
883 | /* allocate transfer buffer */ | |
884 | buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); | |
885 | if (!buffer) { | |
96eefad2 | 886 | sr_printk(KERN_ERR, cd, "out of memory.\n"); |
1da177e4 LT |
887 | return; |
888 | } | |
889 | ||
38582a62 | 890 | /* eat unit attentions */ |
9f8a2c23 | 891 | scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
1da177e4 LT |
892 | |
893 | /* ask for mode page 0x2a */ | |
a00a7862 | 894 | rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, |
1cf72699 | 895 | SR_TIMEOUT, 3, &data, NULL); |
1da177e4 | 896 | |
a00a7862 MP |
897 | if (!scsi_status_is_good(rc) || data.length > ms_len || |
898 | data.header_length + data.block_descriptor_length > data.length) { | |
1da177e4 LT |
899 | /* failed, drive doesn't have capabilities mode page */ |
900 | cd->cdi.speed = 1; | |
901 | cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | | |
bcc1e382 CE |
902 | CDC_DVD | CDC_DVD_RAM | |
903 | CDC_SELECT_DISC | CDC_SELECT_SPEED | | |
904 | CDC_MRW | CDC_MRW_W | CDC_RAM); | |
1da177e4 | 905 | kfree(buffer); |
96eefad2 | 906 | sr_printk(KERN_INFO, cd, "scsi-1 drive"); |
1da177e4 LT |
907 | return; |
908 | } | |
909 | ||
910 | n = data.header_length + data.block_descriptor_length; | |
911 | cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; | |
912 | cd->readcd_known = 1; | |
913 | cd->readcd_cdda = buffer[n + 5] & 0x01; | |
914 | /* print some capability bits */ | |
96eefad2 HR |
915 | sr_printk(KERN_INFO, cd, |
916 | "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", | |
917 | ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, | |
918 | cd->cdi.speed, | |
919 | buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ | |
920 | buffer[n + 3] & 0x20 ? "dvd-ram " : "", | |
921 | buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ | |
922 | buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ | |
923 | buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ | |
924 | loadmech[buffer[n + 6] >> 5]); | |
1da177e4 LT |
925 | if ((buffer[n + 6] >> 5) == 0) |
926 | /* caddy drives can't close tray... */ | |
927 | cd->cdi.mask |= CDC_CLOSE_TRAY; | |
928 | if ((buffer[n + 2] & 0x8) == 0) | |
929 | /* not a DVD drive */ | |
930 | cd->cdi.mask |= CDC_DVD; | |
96eefad2 | 931 | if ((buffer[n + 3] & 0x20) == 0) |
1da177e4 LT |
932 | /* can't write DVD-RAM media */ |
933 | cd->cdi.mask |= CDC_DVD_RAM; | |
934 | if ((buffer[n + 3] & 0x10) == 0) | |
935 | /* can't write DVD-R media */ | |
936 | cd->cdi.mask |= CDC_DVD_R; | |
937 | if ((buffer[n + 3] & 0x2) == 0) | |
938 | /* can't write CD-RW media */ | |
939 | cd->cdi.mask |= CDC_CD_RW; | |
940 | if ((buffer[n + 3] & 0x1) == 0) | |
941 | /* can't write CD-R media */ | |
942 | cd->cdi.mask |= CDC_CD_R; | |
943 | if ((buffer[n + 6] & 0x8) == 0) | |
944 | /* can't eject */ | |
945 | cd->cdi.mask |= CDC_OPEN_TRAY; | |
946 | ||
947 | if ((buffer[n + 6] >> 5) == mechtype_individual_changer || | |
948 | (buffer[n + 6] >> 5) == mechtype_cartridge_changer) | |
949 | cd->cdi.capacity = | |
950 | cdrom_number_of_slots(&cd->cdi); | |
951 | if (cd->cdi.capacity <= 1) | |
952 | /* not a changer */ | |
953 | cd->cdi.mask |= CDC_SELECT_DISC; | |
954 | /*else I don't think it can close its tray | |
955 | cd->cdi.mask |= CDC_CLOSE_TRAY; */ | |
956 | ||
957 | /* | |
958 | * if DVD-RAM, MRW-W or CD-RW, we are randomly writable | |
959 | */ | |
960 | if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != | |
961 | (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { | |
fd2eb903 | 962 | cd->writeable = 1; |
1da177e4 LT |
963 | } |
964 | ||
1da177e4 LT |
965 | kfree(buffer); |
966 | } | |
967 | ||
968 | /* | |
969 | * sr_packet() is the entry point for the generic commands generated | |
96eefad2 | 970 | * by the Uniform CD-ROM layer. |
1da177e4 LT |
971 | */ |
972 | static int sr_packet(struct cdrom_device_info *cdi, | |
973 | struct packet_command *cgc) | |
974 | { | |
8e04d805 HG |
975 | struct scsi_cd *cd = cdi->handle; |
976 | struct scsi_device *sdev = cd->device; | |
977 | ||
978 | if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) | |
979 | return -EDRIVE_CANT_DO_THIS; | |
980 | ||
1da177e4 LT |
981 | if (cgc->timeout <= 0) |
982 | cgc->timeout = IOCTL_TIMEOUT; | |
983 | ||
8e04d805 | 984 | sr_do_ioctl(cd, cgc); |
1da177e4 LT |
985 | |
986 | return cgc->stat; | |
987 | } | |
988 | ||
989 | /** | |
990 | * sr_kref_release - Called to free the scsi_cd structure | |
991 | * @kref: pointer to embedded kref | |
992 | * | |
0b950672 | 993 | * sr_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
994 | * called on last put, you should always use the scsi_cd_get() |
995 | * scsi_cd_put() helpers which manipulate the semaphore directly | |
996 | * and never do a direct kref_put(). | |
997 | **/ | |
998 | static void sr_kref_release(struct kref *kref) | |
999 | { | |
1000 | struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); | |
1001 | struct gendisk *disk = cd->disk; | |
1002 | ||
1003 | spin_lock(&sr_index_lock); | |
f331c029 | 1004 | clear_bit(MINOR(disk_devt(disk)), sr_index_bits); |
1da177e4 LT |
1005 | spin_unlock(&sr_index_lock); |
1006 | ||
1007 | unregister_cdrom(&cd->cdi); | |
1008 | ||
1009 | disk->private_data = NULL; | |
1010 | ||
1011 | put_disk(disk); | |
1012 | ||
1013 | kfree(cd); | |
1014 | } | |
1015 | ||
1016 | static int sr_remove(struct device *dev) | |
1017 | { | |
1018 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
1019 | ||
6c7f1e2f AL |
1020 | scsi_autopm_get_device(cd->device); |
1021 | ||
1da177e4 | 1022 | del_gendisk(cd->disk); |
13b43891 | 1023 | dev_set_drvdata(dev, NULL); |
1da177e4 | 1024 | |
0b950672 | 1025 | mutex_lock(&sr_ref_mutex); |
1da177e4 | 1026 | kref_put(&cd->kref, sr_kref_release); |
0b950672 | 1027 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
1028 | |
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | static int __init init_sr(void) | |
1033 | { | |
1034 | int rc; | |
1035 | ||
1036 | rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1037 | if (rc) | |
1038 | return rc; | |
da3962fe AM |
1039 | rc = scsi_register_driver(&sr_template.gendrv); |
1040 | if (rc) | |
1041 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1042 | ||
1043 | return rc; | |
1da177e4 LT |
1044 | } |
1045 | ||
1046 | static void __exit exit_sr(void) | |
1047 | { | |
1048 | scsi_unregister_driver(&sr_template.gendrv); | |
1049 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1050 | } | |
1051 | ||
1052 | module_init(init_sr); | |
1053 | module_exit(exit_sr); | |
1054 | MODULE_LICENSE("GPL"); |