Commit | Line | Data |
---|---|---|
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> | |
d320a955 | 41 | #include <linux/compat.h> |
1da177e4 LT |
42 | #include <linux/string.h> |
43 | #include <linux/errno.h> | |
44 | #include <linux/cdrom.h> | |
45 | #include <linux/interrupt.h> | |
46 | #include <linux/init.h> | |
47 | #include <linux/blkdev.h> | |
bca6b067 | 48 | #include <linux/blk-pm.h> |
0b950672 | 49 | #include <linux/mutex.h> |
5a0e3ad6 | 50 | #include <linux/slab.h> |
6c7f1e2f | 51 | #include <linux/pm_runtime.h> |
7c0f6ba6 | 52 | #include <linux/uaccess.h> |
1da177e4 | 53 | |
655da8e5 BVA |
54 | #include <asm/unaligned.h> |
55 | ||
1da177e4 LT |
56 | #include <scsi/scsi.h> |
57 | #include <scsi/scsi_dbg.h> | |
58 | #include <scsi/scsi_device.h> | |
59 | #include <scsi/scsi_driver.h> | |
820732b5 | 60 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
61 | #include <scsi/scsi_eh.h> |
62 | #include <scsi/scsi_host.h> | |
63 | #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ | |
1da177e4 LT |
64 | |
65 | #include "scsi_logging.h" | |
66 | #include "sr.h" | |
67 | ||
68 | ||
f018fa55 RH |
69 | MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); |
70 | MODULE_LICENSE("GPL"); | |
71 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); | |
d7b8bcb0 MT |
72 | MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); |
73 | MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); | |
f018fa55 | 74 | |
1da177e4 LT |
75 | #define SR_DISKS 256 |
76 | ||
1da177e4 LT |
77 | #define SR_CAPABILITIES \ |
78 | (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ | |
79 | CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ | |
6a2900b6 | 80 | CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ |
1da177e4 LT |
81 | CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ |
82 | CDC_MRW|CDC_MRW_W|CDC_RAM) | |
83 | ||
84 | static int sr_probe(struct device *); | |
85 | static int sr_remove(struct device *); | |
159b2cbf | 86 | static blk_status_t sr_init_command(struct scsi_cmnd *SCpnt); |
7b3d9545 | 87 | static int sr_done(struct scsi_cmnd *); |
6c7f1e2f AL |
88 | static int sr_runtime_suspend(struct device *dev); |
89 | ||
a816b4c6 | 90 | static const struct dev_pm_ops sr_pm_ops = { |
6c7f1e2f AL |
91 | .runtime_suspend = sr_runtime_suspend, |
92 | }; | |
1da177e4 LT |
93 | |
94 | static struct scsi_driver sr_template = { | |
1da177e4 LT |
95 | .gendrv = { |
96 | .name = "sr", | |
3af6b352 | 97 | .owner = THIS_MODULE, |
1da177e4 LT |
98 | .probe = sr_probe, |
99 | .remove = sr_remove, | |
6c7f1e2f | 100 | .pm = &sr_pm_ops, |
1da177e4 | 101 | }, |
a1b73fc1 | 102 | .init_command = sr_init_command, |
7b3d9545 | 103 | .done = sr_done, |
1da177e4 LT |
104 | }; |
105 | ||
106 | static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; | |
107 | static DEFINE_SPINLOCK(sr_index_lock); | |
108 | ||
109 | /* This semaphore is used to mediate the 0->1 reference get in the | |
110 | * face of object destruction (i.e. we can't allow a get on an | |
111 | * object after last put) */ | |
0b950672 | 112 | static DEFINE_MUTEX(sr_ref_mutex); |
1da177e4 LT |
113 | |
114 | static int sr_open(struct cdrom_device_info *, int); | |
115 | static void sr_release(struct cdrom_device_info *); | |
116 | ||
117 | static void get_sectorsize(struct scsi_cd *); | |
118 | static void get_capabilities(struct scsi_cd *); | |
119 | ||
93aae17a TH |
120 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
121 | unsigned int clearing, int slot); | |
1da177e4 LT |
122 | static int sr_packet(struct cdrom_device_info *, struct packet_command *); |
123 | ||
853fe1bf | 124 | static const struct cdrom_device_ops sr_dops = { |
1da177e4 LT |
125 | .open = sr_open, |
126 | .release = sr_release, | |
127 | .drive_status = sr_drive_status, | |
93aae17a | 128 | .check_events = sr_check_events, |
1da177e4 LT |
129 | .tray_move = sr_tray_move, |
130 | .lock_door = sr_lock_door, | |
131 | .select_speed = sr_select_speed, | |
132 | .get_last_session = sr_get_last_session, | |
133 | .get_mcn = sr_get_mcn, | |
134 | .reset = sr_reset, | |
135 | .audio_ioctl = sr_audio_ioctl, | |
1da177e4 LT |
136 | .capability = SR_CAPABILITIES, |
137 | .generic_packet = sr_packet, | |
138 | }; | |
139 | ||
140 | static void sr_kref_release(struct kref *kref); | |
141 | ||
142 | static inline struct scsi_cd *scsi_cd(struct gendisk *disk) | |
143 | { | |
144 | return container_of(disk->private_data, struct scsi_cd, driver); | |
145 | } | |
146 | ||
6c7f1e2f AL |
147 | static int sr_runtime_suspend(struct device *dev) |
148 | { | |
149 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
150 | ||
13b43891 AS |
151 | if (!cd) /* E.g.: runtime suspend following sr_remove() */ |
152 | return 0; | |
153 | ||
6c7f1e2f AL |
154 | if (cd->media_present) |
155 | return -EBUSY; | |
156 | else | |
157 | return 0; | |
158 | } | |
159 | ||
1da177e4 LT |
160 | /* |
161 | * The get and put routines for the struct scsi_cd. Note this entity | |
162 | * has a scsi_device pointer and owns a reference to this. | |
163 | */ | |
164 | static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) | |
165 | { | |
166 | struct scsi_cd *cd = NULL; | |
167 | ||
0b950672 | 168 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
169 | if (disk->private_data == NULL) |
170 | goto out; | |
171 | cd = scsi_cd(disk); | |
172 | kref_get(&cd->kref); | |
6627b38f AL |
173 | if (scsi_device_get(cd->device)) { |
174 | kref_put(&cd->kref, sr_kref_release); | |
175 | cd = NULL; | |
176 | } | |
1da177e4 | 177 | out: |
0b950672 | 178 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
179 | return cd; |
180 | } | |
181 | ||
858119e1 | 182 | static void scsi_cd_put(struct scsi_cd *cd) |
1da177e4 LT |
183 | { |
184 | struct scsi_device *sdev = cd->device; | |
185 | ||
0b950672 | 186 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
187 | kref_put(&cd->kref, sr_kref_release); |
188 | scsi_device_put(sdev); | |
0b950672 | 189 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
190 | } |
191 | ||
93aae17a TH |
192 | static unsigned int sr_get_events(struct scsi_device *sdev) |
193 | { | |
194 | u8 buf[8]; | |
195 | u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, | |
196 | 1, /* polled */ | |
197 | 0, 0, /* reserved */ | |
198 | 1 << 4, /* notification class: media */ | |
199 | 0, 0, /* reserved */ | |
200 | 0, sizeof(buf), /* allocation length */ | |
201 | 0, /* control */ | |
202 | }; | |
203 | struct event_header *eh = (void *)buf; | |
204 | struct media_event_desc *med = (void *)(buf + 4); | |
205 | struct scsi_sense_hdr sshdr; | |
206 | int result; | |
207 | ||
208 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), | |
209 | &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); | |
210 | if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) | |
211 | return DISK_EVENT_MEDIA_CHANGE; | |
212 | ||
213 | if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) | |
214 | return 0; | |
215 | ||
216 | if (eh->nea || eh->notification_class != 0x4) | |
217 | return 0; | |
218 | ||
219 | if (med->media_event_code == 1) | |
220 | return DISK_EVENT_EJECT_REQUEST; | |
221 | else if (med->media_event_code == 2) | |
222 | return DISK_EVENT_MEDIA_CHANGE; | |
223 | return 0; | |
224 | } | |
225 | ||
1da177e4 | 226 | /* |
93aae17a TH |
227 | * This function checks to see if the media has been changed or eject |
228 | * button has been pressed. It is possible that we have already | |
229 | * sensed a change, or the drive may have sensed one and not yet | |
230 | * reported it. The past events are accumulated in sdev->changed and | |
231 | * returned together with the current state. | |
1da177e4 | 232 | */ |
93aae17a TH |
233 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
234 | unsigned int clearing, int slot) | |
1da177e4 LT |
235 | { |
236 | struct scsi_cd *cd = cdi->handle; | |
93aae17a TH |
237 | bool last_present; |
238 | struct scsi_sense_hdr sshdr; | |
239 | unsigned int events; | |
240 | int ret; | |
1da177e4 | 241 | |
93aae17a TH |
242 | /* no changer support */ |
243 | if (CDSL_CURRENT != slot) | |
244 | return 0; | |
245 | ||
246 | events = sr_get_events(cd->device); | |
79b9677d KS |
247 | cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; |
248 | ||
249 | /* | |
250 | * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree | |
251 | * for several times in a row. We rely on TUR only for this likely | |
252 | * broken device, to prevent generating incorrect media changed | |
253 | * events for every open(). | |
254 | */ | |
255 | if (cd->ignore_get_event) { | |
256 | events &= ~DISK_EVENT_MEDIA_CHANGE; | |
257 | goto do_tur; | |
258 | } | |
259 | ||
93aae17a TH |
260 | /* |
261 | * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE | |
262 | * is being cleared. Note that there are devices which hang | |
263 | * if asked to execute TUR repeatedly. | |
264 | */ | |
79b9677d KS |
265 | if (cd->device->changed) { |
266 | events |= DISK_EVENT_MEDIA_CHANGE; | |
267 | cd->device->changed = 0; | |
268 | cd->tur_changed = true; | |
269 | } | |
93aae17a | 270 | |
79b9677d KS |
271 | if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) |
272 | return events; | |
273 | do_tur: | |
93aae17a TH |
274 | /* let's see whether the media is there with TUR */ |
275 | last_present = cd->media_present; | |
276 | ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); | |
1da177e4 | 277 | |
638428ec TH |
278 | /* |
279 | * Media is considered to be present if TUR succeeds or fails with | |
280 | * sense data indicating something other than media-not-present | |
281 | * (ASC 0x3a). | |
282 | */ | |
93aae17a TH |
283 | cd->media_present = scsi_status_is_good(ret) || |
284 | (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); | |
1da177e4 | 285 | |
93aae17a | 286 | if (last_present != cd->media_present) |
79b9677d KS |
287 | cd->device->changed = 1; |
288 | ||
93aae17a TH |
289 | if (cd->device->changed) { |
290 | events |= DISK_EVENT_MEDIA_CHANGE; | |
291 | cd->device->changed = 0; | |
79b9677d KS |
292 | cd->tur_changed = true; |
293 | } | |
294 | ||
295 | if (cd->ignore_get_event) | |
296 | return events; | |
297 | ||
298 | /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ | |
299 | if (!cd->tur_changed) { | |
300 | if (cd->get_event_changed) { | |
301 | if (cd->tur_mismatch++ > 8) { | |
96eefad2 HR |
302 | sr_printk(KERN_WARNING, cd, |
303 | "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); | |
79b9677d KS |
304 | cd->ignore_get_event = true; |
305 | } | |
306 | } else { | |
307 | cd->tur_mismatch = 0; | |
308 | } | |
1da177e4 | 309 | } |
79b9677d KS |
310 | cd->tur_changed = false; |
311 | cd->get_event_changed = false; | |
285e9670 | 312 | |
93aae17a | 313 | return events; |
1da177e4 | 314 | } |
93aae17a | 315 | |
1da177e4 | 316 | /* |
7b3d9545 | 317 | * sr_done is the interrupt routine for the device driver. |
1da177e4 | 318 | * |
7b3d9545 | 319 | * It will be notified on the end of a SCSI read / write, and will take one |
1da177e4 LT |
320 | * of several actions based on success or failure. |
321 | */ | |
7b3d9545 | 322 | static int sr_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
323 | { |
324 | int result = SCpnt->result; | |
30b0c37b | 325 | int this_count = scsi_bufflen(SCpnt); |
1da177e4 LT |
326 | int good_bytes = (result == 0 ? this_count : 0); |
327 | int block_sectors = 0; | |
328 | long error_sector; | |
329 | struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); | |
330 | ||
331 | #ifdef DEBUG | |
96eefad2 | 332 | scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); |
1da177e4 LT |
333 | #endif |
334 | ||
335 | /* | |
336 | * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial | |
337 | * success. Since this is a relatively rare error condition, no | |
338 | * care is taken to avoid unnecessary additional work such as | |
339 | * memcpy's that could be avoided. | |
340 | */ | |
341 | if (driver_byte(result) != 0 && /* An error occurred */ | |
342 | (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ | |
343 | switch (SCpnt->sense_buffer[2]) { | |
344 | case MEDIUM_ERROR: | |
345 | case VOLUME_OVERFLOW: | |
346 | case ILLEGAL_REQUEST: | |
347 | if (!(SCpnt->sense_buffer[0] & 0x90)) | |
348 | break; | |
655da8e5 BVA |
349 | error_sector = |
350 | get_unaligned_be32(&SCpnt->sense_buffer[3]); | |
1da177e4 LT |
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 | |
7007e9dd | 395 | ret = scsi_alloc_sgtables(SCpnt); |
159b2cbf | 396 | if (ret != BLK_STS_OK) |
7007e9dd | 397 | return ret; |
7f9a6bc4 JB |
398 | cd = scsi_cd(rq->rq_disk); |
399 | ||
96eefad2 HR |
400 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
401 | "Doing sr request, block = %d\n", block)); | |
1da177e4 LT |
402 | |
403 | if (!cd->device || !scsi_device_online(cd->device)) { | |
96eefad2 HR |
404 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
405 | "Finishing %u sectors\n", blk_rq_sectors(rq))); | |
406 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, | |
407 | "Retry with 0x%p\n", SCpnt)); | |
7f9a6bc4 | 408 | goto out; |
1da177e4 LT |
409 | } |
410 | ||
411 | if (cd->device->changed) { | |
412 | /* | |
413 | * quietly refuse to do anything to a changed disc until the | |
414 | * changed bit has been reset | |
415 | */ | |
7f9a6bc4 | 416 | goto out; |
1da177e4 LT |
417 | } |
418 | ||
1da177e4 | 419 | s_size = cd->device->sector_size; |
1da177e4 | 420 | if (s_size != 512 && s_size != 1024 && s_size != 2048) { |
3bf743e7 | 421 | scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); |
7f9a6bc4 | 422 | goto out; |
1da177e4 LT |
423 | } |
424 | ||
aebf526b CH |
425 | switch (req_op(rq)) { |
426 | case REQ_OP_WRITE: | |
fd2eb903 | 427 | if (!cd->writeable) |
7f9a6bc4 | 428 | goto out; |
1da177e4 | 429 | SCpnt->cmnd[0] = WRITE_10; |
96eefad2 | 430 | cd->cdi.media_written = 1; |
aebf526b CH |
431 | break; |
432 | case REQ_OP_READ: | |
1da177e4 | 433 | SCpnt->cmnd[0] = READ_10; |
aebf526b CH |
434 | break; |
435 | default: | |
7f9a6bc4 JB |
436 | blk_dump_rq_flags(rq, "Unknown sr command"); |
437 | goto out; | |
1da177e4 LT |
438 | } |
439 | ||
440 | { | |
30b0c37b BH |
441 | struct scatterlist *sg; |
442 | int i, size = 0, sg_count = scsi_sg_count(SCpnt); | |
1da177e4 | 443 | |
30b0c37b BH |
444 | scsi_for_each_sg(SCpnt, sg, sg_count, i) |
445 | size += sg->length; | |
446 | ||
447 | if (size != scsi_bufflen(SCpnt)) { | |
3bf743e7 JG |
448 | scmd_printk(KERN_ERR, SCpnt, |
449 | "mismatch count %d, bytes %d\n", | |
30b0c37b BH |
450 | size, scsi_bufflen(SCpnt)); |
451 | if (scsi_bufflen(SCpnt) > size) | |
452 | SCpnt->sdb.length = size; | |
1da177e4 LT |
453 | } |
454 | } | |
455 | ||
456 | /* | |
457 | * request doesn't start on hw block boundary, add scatter pads | |
458 | */ | |
83096ebf | 459 | if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || |
30b0c37b | 460 | (scsi_bufflen(SCpnt) % s_size)) { |
3bf743e7 | 461 | scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); |
7f9a6bc4 | 462 | goto out; |
1da177e4 LT |
463 | } |
464 | ||
30b0c37b | 465 | this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); |
1da177e4 LT |
466 | |
467 | ||
96eefad2 HR |
468 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
469 | "%s %d/%u 512 byte blocks.\n", | |
470 | (rq_data_dir(rq) == WRITE) ? | |
1da177e4 | 471 | "writing" : "reading", |
96eefad2 | 472 | this_count, blk_rq_sectors(rq))); |
1da177e4 LT |
473 | |
474 | SCpnt->cmnd[1] = 0; | |
83096ebf | 475 | block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); |
1da177e4 LT |
476 | |
477 | if (this_count > 0xffff) { | |
478 | this_count = 0xffff; | |
30b0c37b | 479 | SCpnt->sdb.length = this_count * s_size; |
1da177e4 LT |
480 | } |
481 | ||
655da8e5 | 482 | put_unaligned_be32(block, &SCpnt->cmnd[2]); |
1da177e4 | 483 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; |
655da8e5 | 484 | put_unaligned_be16(this_count, &SCpnt->cmnd[7]); |
1da177e4 LT |
485 | |
486 | /* | |
487 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
488 | * host adapter, it's safe to assume that we can at least transfer | |
489 | * this many bytes between each connect / disconnect. | |
490 | */ | |
491 | SCpnt->transfersize = cd->device->sector_size; | |
492 | SCpnt->underflow = this_count << 9; | |
1da177e4 | 493 | SCpnt->allowed = MAX_RETRIES; |
9120ac54 | 494 | SCpnt->cmd_len = 10; |
1da177e4 | 495 | |
1da177e4 | 496 | /* |
7007e9dd | 497 | * This indicates that the command is ready from our end to be queued. |
1da177e4 | 498 | */ |
7007e9dd | 499 | return BLK_STS_OK; |
7f9a6bc4 | 500 | out: |
7007e9dd CH |
501 | scsi_free_sgtables(SCpnt); |
502 | return BLK_STS_IOERR; | |
1da177e4 LT |
503 | } |
504 | ||
38a2b557 CH |
505 | static void sr_revalidate_disk(struct scsi_cd *cd) |
506 | { | |
507 | struct scsi_sense_hdr sshdr; | |
508 | ||
509 | /* if the unit is not ready, nothing more to do */ | |
510 | if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) | |
511 | return; | |
512 | sr_cd_check(&cd->cdi); | |
513 | get_sectorsize(cd); | |
514 | } | |
515 | ||
40cc51be | 516 | static int sr_block_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 517 | { |
6e9624b8 | 518 | struct scsi_cd *cd; |
1214fd7b | 519 | struct scsi_device *sdev; |
40cc51be | 520 | int ret = -ENXIO; |
1da177e4 | 521 | |
1214fd7b BVA |
522 | cd = scsi_cd_get(bdev->bd_disk); |
523 | if (!cd) | |
524 | goto out; | |
525 | ||
526 | sdev = cd->device; | |
527 | scsi_autopm_get_device(sdev); | |
afd35c4f | 528 | if (bdev_check_media_change(bdev)) |
38a2b557 | 529 | sr_revalidate_disk(cd); |
2bbea6e1 | 530 | |
51a85881 | 531 | mutex_lock(&cd->lock); |
1214fd7b | 532 | ret = cdrom_open(&cd->cdi, bdev, mode); |
51a85881 | 533 | mutex_unlock(&cd->lock); |
1214fd7b BVA |
534 | |
535 | scsi_autopm_put_device(sdev); | |
536 | if (ret) | |
537 | scsi_cd_put(cd); | |
538 | ||
539 | out: | |
1da177e4 LT |
540 | return ret; |
541 | } | |
542 | ||
db2a144b | 543 | static void sr_block_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 544 | { |
40cc51be | 545 | struct scsi_cd *cd = scsi_cd(disk); |
72655c0e | 546 | |
51a85881 | 547 | mutex_lock(&cd->lock); |
40cc51be | 548 | cdrom_release(&cd->cdi, mode); |
51a85881 | 549 | mutex_unlock(&cd->lock); |
72655c0e BVA |
550 | |
551 | scsi_cd_put(cd); | |
1da177e4 LT |
552 | } |
553 | ||
40cc51be | 554 | static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
1da177e4 LT |
555 | unsigned long arg) |
556 | { | |
40cc51be | 557 | struct scsi_cd *cd = scsi_cd(bdev->bd_disk); |
1da177e4 | 558 | struct scsi_device *sdev = cd->device; |
6a2900b6 CH |
559 | void __user *argp = (void __user *)arg; |
560 | int ret; | |
1da177e4 | 561 | |
51a85881 | 562 | mutex_lock(&cd->lock); |
8a6cfeb6 | 563 | |
906d15fb CH |
564 | ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, |
565 | (mode & FMODE_NDELAY) != 0); | |
566 | if (ret) | |
567 | goto out; | |
568 | ||
1214fd7b BVA |
569 | scsi_autopm_get_device(sdev); |
570 | ||
6a2900b6 CH |
571 | /* |
572 | * Send SCSI addressing ioctls directly to mid level, send other | |
573 | * ioctls to cdrom/block level. | |
574 | */ | |
575 | switch (cmd) { | |
576 | case SCSI_IOCTL_GET_IDLUN: | |
577 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
8a6cfeb6 | 578 | ret = scsi_ioctl(sdev, cmd, argp); |
1214fd7b | 579 | goto put; |
1da177e4 | 580 | } |
6a2900b6 | 581 | |
40cc51be | 582 | ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); |
6397256b | 583 | if (ret != -ENOSYS) |
1214fd7b | 584 | goto put; |
6a2900b6 | 585 | |
8a6cfeb6 AB |
586 | ret = scsi_ioctl(sdev, cmd, argp); |
587 | ||
1214fd7b BVA |
588 | put: |
589 | scsi_autopm_put_device(sdev); | |
590 | ||
8a6cfeb6 | 591 | out: |
51a85881 | 592 | mutex_unlock(&cd->lock); |
8a6cfeb6 | 593 | return ret; |
1da177e4 LT |
594 | } |
595 | ||
d320a955 AB |
596 | #ifdef CONFIG_COMPAT |
597 | static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, | |
598 | unsigned long arg) | |
599 | { | |
600 | struct scsi_cd *cd = scsi_cd(bdev->bd_disk); | |
601 | struct scsi_device *sdev = cd->device; | |
602 | void __user *argp = compat_ptr(arg); | |
603 | int ret; | |
604 | ||
51a85881 | 605 | mutex_lock(&cd->lock); |
d320a955 AB |
606 | |
607 | ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, | |
608 | (mode & FMODE_NDELAY) != 0); | |
609 | if (ret) | |
610 | goto out; | |
611 | ||
612 | scsi_autopm_get_device(sdev); | |
613 | ||
614 | /* | |
615 | * Send SCSI addressing ioctls directly to mid level, send other | |
616 | * ioctls to cdrom/block level. | |
617 | */ | |
618 | switch (cmd) { | |
619 | case SCSI_IOCTL_GET_IDLUN: | |
620 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
621 | ret = scsi_compat_ioctl(sdev, cmd, argp); | |
622 | goto put; | |
623 | } | |
624 | ||
64cbfa96 AB |
625 | ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, (unsigned long)argp); |
626 | if (ret != -ENOSYS) | |
d320a955 AB |
627 | goto put; |
628 | ||
629 | ret = scsi_compat_ioctl(sdev, cmd, argp); | |
630 | ||
631 | put: | |
632 | scsi_autopm_put_device(sdev); | |
633 | ||
634 | out: | |
51a85881 | 635 | mutex_unlock(&cd->lock); |
d320a955 AB |
636 | return ret; |
637 | ||
638 | } | |
639 | #endif | |
640 | ||
93aae17a TH |
641 | static unsigned int sr_block_check_events(struct gendisk *disk, |
642 | unsigned int clearing) | |
1da177e4 | 643 | { |
2d097c50 JA |
644 | unsigned int ret = 0; |
645 | struct scsi_cd *cd; | |
6c7f1e2f | 646 | |
2d097c50 JA |
647 | cd = scsi_cd_get(disk); |
648 | if (!cd) | |
6627b38f | 649 | return 0; |
6c7f1e2f | 650 | |
2d097c50 JA |
651 | if (!atomic_read(&cd->device->disk_events_disable_depth)) |
652 | ret = cdrom_check_events(&cd->cdi, clearing); | |
653 | ||
654 | scsi_cd_put(cd); | |
655 | return ret; | |
93aae17a TH |
656 | } |
657 | ||
83d5cde4 | 658 | static const struct block_device_operations sr_bdops = |
1da177e4 LT |
659 | { |
660 | .owner = THIS_MODULE, | |
40cc51be AV |
661 | .open = sr_block_open, |
662 | .release = sr_block_release, | |
8a6cfeb6 | 663 | .ioctl = sr_block_ioctl, |
d320a955 | 664 | #ifdef CONFIG_COMPAT |
03264ddd | 665 | .compat_ioctl = sr_block_compat_ioctl, |
d320a955 | 666 | #endif |
93aae17a | 667 | .check_events = sr_block_check_events, |
1da177e4 LT |
668 | }; |
669 | ||
670 | static int sr_open(struct cdrom_device_info *cdi, int purpose) | |
671 | { | |
672 | struct scsi_cd *cd = cdi->handle; | |
673 | struct scsi_device *sdev = cd->device; | |
674 | int retval; | |
675 | ||
676 | /* | |
677 | * If the device is in error recovery, wait until it is done. | |
678 | * If the device is offline, then disallow any access to it. | |
679 | */ | |
680 | retval = -ENXIO; | |
681 | if (!scsi_block_when_processing_errors(sdev)) | |
682 | goto error_out; | |
683 | ||
1da177e4 LT |
684 | return 0; |
685 | ||
686 | error_out: | |
687 | return retval; | |
688 | } | |
689 | ||
690 | static void sr_release(struct cdrom_device_info *cdi) | |
691 | { | |
1da177e4 LT |
692 | } |
693 | ||
694 | static int sr_probe(struct device *dev) | |
695 | { | |
696 | struct scsi_device *sdev = to_scsi_device(dev); | |
697 | struct gendisk *disk; | |
698 | struct scsi_cd *cd; | |
699 | int minor, error; | |
700 | ||
6fe8c1db | 701 | scsi_autopm_get_device(sdev); |
1da177e4 LT |
702 | error = -ENODEV; |
703 | if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) | |
704 | goto fail; | |
705 | ||
706 | error = -ENOMEM; | |
24669f75 | 707 | cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
1da177e4 LT |
708 | if (!cd) |
709 | goto fail; | |
1da177e4 LT |
710 | |
711 | kref_init(&cd->kref); | |
712 | ||
713 | disk = alloc_disk(1); | |
714 | if (!disk) | |
715 | goto fail_free; | |
51a85881 | 716 | mutex_init(&cd->lock); |
1da177e4 LT |
717 | |
718 | spin_lock(&sr_index_lock); | |
719 | minor = find_first_zero_bit(sr_index_bits, SR_DISKS); | |
720 | if (minor == SR_DISKS) { | |
721 | spin_unlock(&sr_index_lock); | |
722 | error = -EBUSY; | |
723 | goto fail_put; | |
724 | } | |
725 | __set_bit(minor, sr_index_bits); | |
726 | spin_unlock(&sr_index_lock); | |
727 | ||
728 | disk->major = SCSI_CDROM_MAJOR; | |
729 | disk->first_minor = minor; | |
730 | sprintf(disk->disk_name, "sr%d", minor); | |
731 | disk->fops = &sr_bdops; | |
d4dc210f | 732 | disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; |
93aae17a | 733 | disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; |
c92e2f04 | 734 | disk->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT; |
1da177e4 | 735 | |
242f9dcb JA |
736 | blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); |
737 | ||
1da177e4 LT |
738 | cd->device = sdev; |
739 | cd->disk = disk; | |
740 | cd->driver = &sr_template; | |
741 | cd->disk = disk; | |
742 | cd->capacity = 0x1fffff; | |
1da177e4 | 743 | cd->device->changed = 1; /* force recheck CD type */ |
93aae17a | 744 | cd->media_present = 1; |
1da177e4 LT |
745 | cd->use = 1; |
746 | cd->readcd_known = 0; | |
747 | cd->readcd_cdda = 0; | |
748 | ||
749 | cd->cdi.ops = &sr_dops; | |
750 | cd->cdi.handle = cd; | |
751 | cd->cdi.mask = 0; | |
752 | cd->cdi.capacity = 1; | |
753 | sprintf(cd->cdi.name, "sr%d", minor); | |
754 | ||
755 | sdev->sector_size = 2048; /* A guess, just in case */ | |
756 | ||
757 | /* FIXME: need to handle a get_capabilities failure properly ?? */ | |
758 | get_capabilities(cd); | |
759 | sr_vendor_init(cd); | |
760 | ||
1da177e4 LT |
761 | set_capacity(disk, cd->capacity); |
762 | disk->private_data = &cd->driver; | |
763 | disk->queue = sdev->request_queue; | |
1da177e4 | 764 | |
a711d91c | 765 | if (register_cdrom(disk, &cd->cdi)) |
6555781b | 766 | goto fail_minor; |
1da177e4 | 767 | |
6627b38f AL |
768 | /* |
769 | * Initialize block layer runtime PM stuffs before the | |
770 | * periodic event checking request gets started in add_disk. | |
771 | */ | |
772 | blk_pm_runtime_init(sdev->request_queue, dev); | |
773 | ||
1da177e4 LT |
774 | dev_set_drvdata(dev, cd); |
775 | disk->flags |= GENHD_FL_REMOVABLE; | |
38a2b557 | 776 | sr_revalidate_disk(cd); |
fef912bf | 777 | device_add_disk(&sdev->sdev_gendev, disk, NULL); |
1da177e4 | 778 | |
9ccfc756 JB |
779 | sdev_printk(KERN_DEBUG, sdev, |
780 | "Attached scsi CD-ROM %s\n", cd->cdi.name); | |
6c7f1e2f AL |
781 | scsi_autopm_put_device(cd->device); |
782 | ||
1da177e4 LT |
783 | return 0; |
784 | ||
6555781b SA |
785 | fail_minor: |
786 | spin_lock(&sr_index_lock); | |
787 | clear_bit(minor, sr_index_bits); | |
788 | spin_unlock(&sr_index_lock); | |
1da177e4 LT |
789 | fail_put: |
790 | put_disk(disk); | |
a247e07f | 791 | mutex_destroy(&cd->lock); |
1da177e4 LT |
792 | fail_free: |
793 | kfree(cd); | |
794 | fail: | |
6fe8c1db | 795 | scsi_autopm_put_device(sdev); |
1da177e4 LT |
796 | return error; |
797 | } | |
798 | ||
799 | ||
800 | static void get_sectorsize(struct scsi_cd *cd) | |
801 | { | |
802 | unsigned char cmd[10]; | |
62858dac | 803 | unsigned char buffer[8]; |
1da177e4 LT |
804 | int the_result, retries = 3; |
805 | int sector_size; | |
165125e1 | 806 | struct request_queue *queue; |
1da177e4 | 807 | |
1da177e4 LT |
808 | do { |
809 | cmd[0] = READ_CAPACITY; | |
810 | memset((void *) &cmd[1], 0, 9); | |
62858dac | 811 | memset(buffer, 0, sizeof(buffer)); |
1da177e4 LT |
812 | |
813 | /* Do the command and wait.. */ | |
820732b5 | 814 | the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
62858dac | 815 | buffer, sizeof(buffer), NULL, |
f4f4e47e | 816 | SR_TIMEOUT, MAX_RETRIES, NULL); |
1da177e4 | 817 | |
1da177e4 LT |
818 | retries--; |
819 | ||
820 | } while (the_result && retries); | |
821 | ||
822 | ||
1da177e4 LT |
823 | if (the_result) { |
824 | cd->capacity = 0x1fffff; | |
825 | sector_size = 2048; /* A guess, just in case */ | |
1da177e4 | 826 | } else { |
5915136d TH |
827 | long last_written; |
828 | ||
655da8e5 | 829 | cd->capacity = 1 + get_unaligned_be32(&buffer[0]); |
5915136d TH |
830 | /* |
831 | * READ_CAPACITY doesn't return the correct size on | |
832 | * certain UDF media. If last_written is larger, use | |
833 | * it instead. | |
834 | * | |
835 | * http://bugzilla.kernel.org/show_bug.cgi?id=9668 | |
836 | */ | |
837 | if (!cdrom_get_last_written(&cd->cdi, &last_written)) | |
838 | cd->capacity = max_t(long, cd->capacity, last_written); | |
839 | ||
655da8e5 | 840 | sector_size = get_unaligned_be32(&buffer[4]); |
1da177e4 LT |
841 | switch (sector_size) { |
842 | /* | |
843 | * HP 4020i CD-Recorder reports 2340 byte sectors | |
844 | * Philips CD-Writers report 2352 byte sectors | |
845 | * | |
846 | * Use 2k sectors for them.. | |
847 | */ | |
848 | case 0: | |
849 | case 2340: | |
850 | case 2352: | |
851 | sector_size = 2048; | |
df561f66 | 852 | fallthrough; |
1da177e4 LT |
853 | case 2048: |
854 | cd->capacity *= 4; | |
df561f66 | 855 | fallthrough; |
1da177e4 LT |
856 | case 512: |
857 | break; | |
858 | default: | |
96eefad2 HR |
859 | sr_printk(KERN_INFO, cd, |
860 | "unsupported sector size %d.", sector_size); | |
1da177e4 | 861 | cd->capacity = 0; |
1da177e4 LT |
862 | } |
863 | ||
864 | cd->device->sector_size = sector_size; | |
865 | ||
866 | /* | |
867 | * Add this so that we have the ability to correctly gauge | |
868 | * what the device is capable of. | |
869 | */ | |
1da177e4 LT |
870 | set_capacity(cd->disk, cd->capacity); |
871 | } | |
872 | ||
873 | queue = cd->device->request_queue; | |
e1defc4f | 874 | blk_queue_logical_block_size(queue, sector_size); |
1da177e4 | 875 | |
62858dac | 876 | return; |
1da177e4 LT |
877 | } |
878 | ||
879 | static void get_capabilities(struct scsi_cd *cd) | |
880 | { | |
881 | unsigned char *buffer; | |
882 | struct scsi_mode_data data; | |
820732b5 | 883 | struct scsi_sense_hdr sshdr; |
a00a7862 | 884 | unsigned int ms_len = 128; |
38582a62 | 885 | int rc, n; |
1da177e4 | 886 | |
0ad78200 | 887 | static const char *loadmech[] = |
1da177e4 LT |
888 | { |
889 | "caddy", | |
890 | "tray", | |
891 | "pop-up", | |
892 | "", | |
893 | "changer", | |
894 | "cartridge changer", | |
895 | "", | |
896 | "" | |
897 | }; | |
898 | ||
1da177e4 LT |
899 | |
900 | /* allocate transfer buffer */ | |
901 | buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); | |
902 | if (!buffer) { | |
96eefad2 | 903 | sr_printk(KERN_ERR, cd, "out of memory.\n"); |
1da177e4 LT |
904 | return; |
905 | } | |
906 | ||
38582a62 | 907 | /* eat unit attentions */ |
9f8a2c23 | 908 | scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
1da177e4 LT |
909 | |
910 | /* ask for mode page 0x2a */ | |
a00a7862 | 911 | rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, |
1cf72699 | 912 | SR_TIMEOUT, 3, &data, NULL); |
1da177e4 | 913 | |
a00a7862 MP |
914 | if (!scsi_status_is_good(rc) || data.length > ms_len || |
915 | data.header_length + data.block_descriptor_length > data.length) { | |
1da177e4 LT |
916 | /* failed, drive doesn't have capabilities mode page */ |
917 | cd->cdi.speed = 1; | |
918 | cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | | |
bcc1e382 CE |
919 | CDC_DVD | CDC_DVD_RAM | |
920 | CDC_SELECT_DISC | CDC_SELECT_SPEED | | |
921 | CDC_MRW | CDC_MRW_W | CDC_RAM); | |
1da177e4 | 922 | kfree(buffer); |
96eefad2 | 923 | sr_printk(KERN_INFO, cd, "scsi-1 drive"); |
1da177e4 LT |
924 | return; |
925 | } | |
926 | ||
927 | n = data.header_length + data.block_descriptor_length; | |
655da8e5 | 928 | cd->cdi.speed = get_unaligned_be16(&buffer[n + 8]) / 176; |
1da177e4 LT |
929 | cd->readcd_known = 1; |
930 | cd->readcd_cdda = buffer[n + 5] & 0x01; | |
931 | /* print some capability bits */ | |
96eefad2 HR |
932 | sr_printk(KERN_INFO, cd, |
933 | "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", | |
655da8e5 | 934 | get_unaligned_be16(&buffer[n + 14]) / 176, |
96eefad2 HR |
935 | cd->cdi.speed, |
936 | buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ | |
937 | buffer[n + 3] & 0x20 ? "dvd-ram " : "", | |
938 | buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ | |
939 | buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ | |
940 | buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ | |
941 | loadmech[buffer[n + 6] >> 5]); | |
1da177e4 LT |
942 | if ((buffer[n + 6] >> 5) == 0) |
943 | /* caddy drives can't close tray... */ | |
944 | cd->cdi.mask |= CDC_CLOSE_TRAY; | |
945 | if ((buffer[n + 2] & 0x8) == 0) | |
946 | /* not a DVD drive */ | |
947 | cd->cdi.mask |= CDC_DVD; | |
96eefad2 | 948 | if ((buffer[n + 3] & 0x20) == 0) |
1da177e4 LT |
949 | /* can't write DVD-RAM media */ |
950 | cd->cdi.mask |= CDC_DVD_RAM; | |
951 | if ((buffer[n + 3] & 0x10) == 0) | |
952 | /* can't write DVD-R media */ | |
953 | cd->cdi.mask |= CDC_DVD_R; | |
954 | if ((buffer[n + 3] & 0x2) == 0) | |
955 | /* can't write CD-RW media */ | |
956 | cd->cdi.mask |= CDC_CD_RW; | |
957 | if ((buffer[n + 3] & 0x1) == 0) | |
958 | /* can't write CD-R media */ | |
959 | cd->cdi.mask |= CDC_CD_R; | |
960 | if ((buffer[n + 6] & 0x8) == 0) | |
961 | /* can't eject */ | |
962 | cd->cdi.mask |= CDC_OPEN_TRAY; | |
963 | ||
964 | if ((buffer[n + 6] >> 5) == mechtype_individual_changer || | |
965 | (buffer[n + 6] >> 5) == mechtype_cartridge_changer) | |
966 | cd->cdi.capacity = | |
967 | cdrom_number_of_slots(&cd->cdi); | |
968 | if (cd->cdi.capacity <= 1) | |
969 | /* not a changer */ | |
970 | cd->cdi.mask |= CDC_SELECT_DISC; | |
971 | /*else I don't think it can close its tray | |
972 | cd->cdi.mask |= CDC_CLOSE_TRAY; */ | |
973 | ||
974 | /* | |
975 | * if DVD-RAM, MRW-W or CD-RW, we are randomly writable | |
976 | */ | |
977 | if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != | |
978 | (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { | |
fd2eb903 | 979 | cd->writeable = 1; |
1da177e4 LT |
980 | } |
981 | ||
1da177e4 LT |
982 | kfree(buffer); |
983 | } | |
984 | ||
985 | /* | |
986 | * sr_packet() is the entry point for the generic commands generated | |
96eefad2 | 987 | * by the Uniform CD-ROM layer. |
1da177e4 LT |
988 | */ |
989 | static int sr_packet(struct cdrom_device_info *cdi, | |
990 | struct packet_command *cgc) | |
991 | { | |
8e04d805 HG |
992 | struct scsi_cd *cd = cdi->handle; |
993 | struct scsi_device *sdev = cd->device; | |
994 | ||
995 | if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) | |
996 | return -EDRIVE_CANT_DO_THIS; | |
997 | ||
1da177e4 LT |
998 | if (cgc->timeout <= 0) |
999 | cgc->timeout = IOCTL_TIMEOUT; | |
1000 | ||
8e04d805 | 1001 | sr_do_ioctl(cd, cgc); |
1da177e4 LT |
1002 | |
1003 | return cgc->stat; | |
1004 | } | |
1005 | ||
1006 | /** | |
1007 | * sr_kref_release - Called to free the scsi_cd structure | |
1008 | * @kref: pointer to embedded kref | |
1009 | * | |
0b950672 | 1010 | * sr_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
1011 | * called on last put, you should always use the scsi_cd_get() |
1012 | * scsi_cd_put() helpers which manipulate the semaphore directly | |
1013 | * and never do a direct kref_put(). | |
1014 | **/ | |
1015 | static void sr_kref_release(struct kref *kref) | |
1016 | { | |
1017 | struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); | |
1018 | struct gendisk *disk = cd->disk; | |
1019 | ||
1020 | spin_lock(&sr_index_lock); | |
f331c029 | 1021 | clear_bit(MINOR(disk_devt(disk)), sr_index_bits); |
1da177e4 LT |
1022 | spin_unlock(&sr_index_lock); |
1023 | ||
1024 | unregister_cdrom(&cd->cdi); | |
1025 | ||
1026 | disk->private_data = NULL; | |
1027 | ||
1028 | put_disk(disk); | |
1029 | ||
51a85881 MW |
1030 | mutex_destroy(&cd->lock); |
1031 | ||
1da177e4 LT |
1032 | kfree(cd); |
1033 | } | |
1034 | ||
1035 | static int sr_remove(struct device *dev) | |
1036 | { | |
1037 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
1038 | ||
6c7f1e2f AL |
1039 | scsi_autopm_get_device(cd->device); |
1040 | ||
1da177e4 | 1041 | del_gendisk(cd->disk); |
13b43891 | 1042 | dev_set_drvdata(dev, NULL); |
1da177e4 | 1043 | |
0b950672 | 1044 | mutex_lock(&sr_ref_mutex); |
1da177e4 | 1045 | kref_put(&cd->kref, sr_kref_release); |
0b950672 | 1046 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
1047 | |
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | static int __init init_sr(void) | |
1052 | { | |
1053 | int rc; | |
1054 | ||
1055 | rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1056 | if (rc) | |
1057 | return rc; | |
da3962fe AM |
1058 | rc = scsi_register_driver(&sr_template.gendrv); |
1059 | if (rc) | |
1060 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1061 | ||
1062 | return rc; | |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | static void __exit exit_sr(void) | |
1066 | { | |
1067 | scsi_unregister_driver(&sr_template.gendrv); | |
1068 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1069 | } | |
1070 | ||
1071 | module_init(init_sr); | |
1072 | module_exit(exit_sr); | |
1073 | MODULE_LICENSE("GPL"); |