Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * sr.c Copyright (C) 1992 David Giller | |
3 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale | |
4 | * | |
5 | * adapted from: | |
6 | * sd.c Copyright (C) 1992 Drew Eckhardt | |
7 | * Linux scsi disk driver by | |
8 | * Drew Eckhardt <drew@colorado.edu> | |
9 | * | |
10 | * Modified by Eric Youngdale ericy@andante.org to | |
11 | * add scatter-gather, multiple outstanding request, and other | |
12 | * enhancements. | |
13 | * | |
14 | * Modified by Eric Youngdale eric@andante.org to support loadable | |
15 | * low-level scsi drivers. | |
16 | * | |
17 | * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to | |
18 | * provide auto-eject. | |
19 | * | |
20 | * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the | |
21 | * generic cdrom interface | |
22 | * | |
23 | * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() | |
24 | * interface, capabilities probe additions, ioctl cleanups, etc. | |
25 | * | |
26 | * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs | |
27 | * | |
28 | * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM | |
29 | * transparently and lose the GHOST hack | |
30 | * | |
31 | * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
32 | * check resource allocation in sr_init and some cleanups | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/fs.h> | |
37 | #include <linux/kernel.h> | |
1da177e4 LT |
38 | #include <linux/mm.h> |
39 | #include <linux/bio.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/cdrom.h> | |
43 | #include <linux/interrupt.h> | |
44 | #include <linux/init.h> | |
45 | #include <linux/blkdev.h> | |
0b950672 | 46 | #include <linux/mutex.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
6c7f1e2f | 48 | #include <linux/pm_runtime.h> |
7c0f6ba6 | 49 | #include <linux/uaccess.h> |
1da177e4 LT |
50 | |
51 | #include <scsi/scsi.h> | |
52 | #include <scsi/scsi_dbg.h> | |
53 | #include <scsi/scsi_device.h> | |
54 | #include <scsi/scsi_driver.h> | |
820732b5 | 55 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
56 | #include <scsi/scsi_eh.h> |
57 | #include <scsi/scsi_host.h> | |
58 | #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ | |
1da177e4 LT |
59 | |
60 | #include "scsi_logging.h" | |
61 | #include "sr.h" | |
62 | ||
63 | ||
f018fa55 RH |
64 | MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); |
65 | MODULE_LICENSE("GPL"); | |
66 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); | |
d7b8bcb0 MT |
67 | MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); |
68 | MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); | |
f018fa55 | 69 | |
1da177e4 LT |
70 | #define SR_DISKS 256 |
71 | ||
1da177e4 LT |
72 | #define SR_CAPABILITIES \ |
73 | (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ | |
74 | CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ | |
6a2900b6 | 75 | CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ |
1da177e4 LT |
76 | CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ |
77 | CDC_MRW|CDC_MRW_W|CDC_RAM) | |
78 | ||
2a48fc0a | 79 | static DEFINE_MUTEX(sr_mutex); |
1da177e4 LT |
80 | static int sr_probe(struct device *); |
81 | static int sr_remove(struct device *); | |
a1b73fc1 | 82 | static int sr_init_command(struct scsi_cmnd *SCpnt); |
7b3d9545 | 83 | static int sr_done(struct scsi_cmnd *); |
6c7f1e2f AL |
84 | static int sr_runtime_suspend(struct device *dev); |
85 | ||
a816b4c6 | 86 | static const struct dev_pm_ops sr_pm_ops = { |
6c7f1e2f AL |
87 | .runtime_suspend = sr_runtime_suspend, |
88 | }; | |
1da177e4 LT |
89 | |
90 | static struct scsi_driver sr_template = { | |
1da177e4 LT |
91 | .gendrv = { |
92 | .name = "sr", | |
3af6b352 | 93 | .owner = THIS_MODULE, |
1da177e4 LT |
94 | .probe = sr_probe, |
95 | .remove = sr_remove, | |
6c7f1e2f | 96 | .pm = &sr_pm_ops, |
1da177e4 | 97 | }, |
a1b73fc1 | 98 | .init_command = sr_init_command, |
7b3d9545 | 99 | .done = sr_done, |
1da177e4 LT |
100 | }; |
101 | ||
102 | static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; | |
103 | static DEFINE_SPINLOCK(sr_index_lock); | |
104 | ||
105 | /* This semaphore is used to mediate the 0->1 reference get in the | |
106 | * face of object destruction (i.e. we can't allow a get on an | |
107 | * object after last put) */ | |
0b950672 | 108 | static DEFINE_MUTEX(sr_ref_mutex); |
1da177e4 LT |
109 | |
110 | static int sr_open(struct cdrom_device_info *, int); | |
111 | static void sr_release(struct cdrom_device_info *); | |
112 | ||
113 | static void get_sectorsize(struct scsi_cd *); | |
114 | static void get_capabilities(struct scsi_cd *); | |
115 | ||
93aae17a TH |
116 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
117 | unsigned int clearing, int slot); | |
1da177e4 LT |
118 | static int sr_packet(struct cdrom_device_info *, struct packet_command *); |
119 | ||
853fe1bf | 120 | static const struct cdrom_device_ops sr_dops = { |
1da177e4 LT |
121 | .open = sr_open, |
122 | .release = sr_release, | |
123 | .drive_status = sr_drive_status, | |
93aae17a | 124 | .check_events = sr_check_events, |
1da177e4 LT |
125 | .tray_move = sr_tray_move, |
126 | .lock_door = sr_lock_door, | |
127 | .select_speed = sr_select_speed, | |
128 | .get_last_session = sr_get_last_session, | |
129 | .get_mcn = sr_get_mcn, | |
130 | .reset = sr_reset, | |
131 | .audio_ioctl = sr_audio_ioctl, | |
1da177e4 LT |
132 | .capability = SR_CAPABILITIES, |
133 | .generic_packet = sr_packet, | |
134 | }; | |
135 | ||
136 | static void sr_kref_release(struct kref *kref); | |
137 | ||
138 | static inline struct scsi_cd *scsi_cd(struct gendisk *disk) | |
139 | { | |
140 | return container_of(disk->private_data, struct scsi_cd, driver); | |
141 | } | |
142 | ||
6c7f1e2f AL |
143 | static int sr_runtime_suspend(struct device *dev) |
144 | { | |
145 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
146 | ||
13b43891 AS |
147 | if (!cd) /* E.g.: runtime suspend following sr_remove() */ |
148 | return 0; | |
149 | ||
6c7f1e2f AL |
150 | if (cd->media_present) |
151 | return -EBUSY; | |
152 | else | |
153 | return 0; | |
154 | } | |
155 | ||
1da177e4 LT |
156 | /* |
157 | * The get and put routines for the struct scsi_cd. Note this entity | |
158 | * has a scsi_device pointer and owns a reference to this. | |
159 | */ | |
160 | static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) | |
161 | { | |
162 | struct scsi_cd *cd = NULL; | |
163 | ||
0b950672 | 164 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
165 | if (disk->private_data == NULL) |
166 | goto out; | |
167 | cd = scsi_cd(disk); | |
168 | kref_get(&cd->kref); | |
6627b38f AL |
169 | if (scsi_device_get(cd->device)) { |
170 | kref_put(&cd->kref, sr_kref_release); | |
171 | cd = NULL; | |
172 | } | |
1da177e4 | 173 | out: |
0b950672 | 174 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
175 | return cd; |
176 | } | |
177 | ||
858119e1 | 178 | static void scsi_cd_put(struct scsi_cd *cd) |
1da177e4 LT |
179 | { |
180 | struct scsi_device *sdev = cd->device; | |
181 | ||
0b950672 | 182 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
183 | kref_put(&cd->kref, sr_kref_release); |
184 | scsi_device_put(sdev); | |
0b950672 | 185 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
186 | } |
187 | ||
93aae17a TH |
188 | static unsigned int sr_get_events(struct scsi_device *sdev) |
189 | { | |
190 | u8 buf[8]; | |
191 | u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, | |
192 | 1, /* polled */ | |
193 | 0, 0, /* reserved */ | |
194 | 1 << 4, /* notification class: media */ | |
195 | 0, 0, /* reserved */ | |
196 | 0, sizeof(buf), /* allocation length */ | |
197 | 0, /* control */ | |
198 | }; | |
199 | struct event_header *eh = (void *)buf; | |
200 | struct media_event_desc *med = (void *)(buf + 4); | |
201 | struct scsi_sense_hdr sshdr; | |
202 | int result; | |
203 | ||
204 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), | |
205 | &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); | |
206 | if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) | |
207 | return DISK_EVENT_MEDIA_CHANGE; | |
208 | ||
209 | if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) | |
210 | return 0; | |
211 | ||
212 | if (eh->nea || eh->notification_class != 0x4) | |
213 | return 0; | |
214 | ||
215 | if (med->media_event_code == 1) | |
216 | return DISK_EVENT_EJECT_REQUEST; | |
217 | else if (med->media_event_code == 2) | |
218 | return DISK_EVENT_MEDIA_CHANGE; | |
219 | return 0; | |
220 | } | |
221 | ||
1da177e4 | 222 | /* |
93aae17a TH |
223 | * This function checks to see if the media has been changed or eject |
224 | * button has been pressed. It is possible that we have already | |
225 | * sensed a change, or the drive may have sensed one and not yet | |
226 | * reported it. The past events are accumulated in sdev->changed and | |
227 | * returned together with the current state. | |
1da177e4 | 228 | */ |
93aae17a TH |
229 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
230 | unsigned int clearing, int slot) | |
1da177e4 LT |
231 | { |
232 | struct scsi_cd *cd = cdi->handle; | |
93aae17a TH |
233 | bool last_present; |
234 | struct scsi_sense_hdr sshdr; | |
235 | unsigned int events; | |
236 | int ret; | |
1da177e4 | 237 | |
93aae17a TH |
238 | /* no changer support */ |
239 | if (CDSL_CURRENT != slot) | |
240 | return 0; | |
241 | ||
242 | events = sr_get_events(cd->device); | |
79b9677d KS |
243 | cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; |
244 | ||
245 | /* | |
246 | * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree | |
247 | * for several times in a row. We rely on TUR only for this likely | |
248 | * broken device, to prevent generating incorrect media changed | |
249 | * events for every open(). | |
250 | */ | |
251 | if (cd->ignore_get_event) { | |
252 | events &= ~DISK_EVENT_MEDIA_CHANGE; | |
253 | goto do_tur; | |
254 | } | |
255 | ||
93aae17a TH |
256 | /* |
257 | * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE | |
258 | * is being cleared. Note that there are devices which hang | |
259 | * if asked to execute TUR repeatedly. | |
260 | */ | |
79b9677d KS |
261 | if (cd->device->changed) { |
262 | events |= DISK_EVENT_MEDIA_CHANGE; | |
263 | cd->device->changed = 0; | |
264 | cd->tur_changed = true; | |
265 | } | |
93aae17a | 266 | |
79b9677d KS |
267 | if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) |
268 | return events; | |
269 | do_tur: | |
93aae17a TH |
270 | /* let's see whether the media is there with TUR */ |
271 | last_present = cd->media_present; | |
272 | ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); | |
1da177e4 | 273 | |
638428ec TH |
274 | /* |
275 | * Media is considered to be present if TUR succeeds or fails with | |
276 | * sense data indicating something other than media-not-present | |
277 | * (ASC 0x3a). | |
278 | */ | |
93aae17a TH |
279 | cd->media_present = scsi_status_is_good(ret) || |
280 | (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); | |
1da177e4 | 281 | |
93aae17a | 282 | if (last_present != cd->media_present) |
79b9677d KS |
283 | cd->device->changed = 1; |
284 | ||
93aae17a TH |
285 | if (cd->device->changed) { |
286 | events |= DISK_EVENT_MEDIA_CHANGE; | |
287 | cd->device->changed = 0; | |
79b9677d KS |
288 | cd->tur_changed = true; |
289 | } | |
290 | ||
291 | if (cd->ignore_get_event) | |
292 | return events; | |
293 | ||
294 | /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ | |
295 | if (!cd->tur_changed) { | |
296 | if (cd->get_event_changed) { | |
297 | if (cd->tur_mismatch++ > 8) { | |
96eefad2 HR |
298 | sr_printk(KERN_WARNING, cd, |
299 | "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); | |
79b9677d KS |
300 | cd->ignore_get_event = true; |
301 | } | |
302 | } else { | |
303 | cd->tur_mismatch = 0; | |
304 | } | |
1da177e4 | 305 | } |
79b9677d KS |
306 | cd->tur_changed = false; |
307 | cd->get_event_changed = false; | |
285e9670 | 308 | |
93aae17a | 309 | return events; |
1da177e4 | 310 | } |
93aae17a | 311 | |
1da177e4 | 312 | /* |
7b3d9545 | 313 | * sr_done is the interrupt routine for the device driver. |
1da177e4 | 314 | * |
7b3d9545 | 315 | * It will be notified on the end of a SCSI read / write, and will take one |
1da177e4 LT |
316 | * of several actions based on success or failure. |
317 | */ | |
7b3d9545 | 318 | static int sr_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
319 | { |
320 | int result = SCpnt->result; | |
30b0c37b | 321 | int this_count = scsi_bufflen(SCpnt); |
1da177e4 LT |
322 | int good_bytes = (result == 0 ? this_count : 0); |
323 | int block_sectors = 0; | |
324 | long error_sector; | |
325 | struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); | |
326 | ||
327 | #ifdef DEBUG | |
96eefad2 | 328 | scmd_printk(KERN_INFO, SCpnt, "done: %x\n", result); |
1da177e4 LT |
329 | #endif |
330 | ||
331 | /* | |
332 | * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial | |
333 | * success. Since this is a relatively rare error condition, no | |
334 | * care is taken to avoid unnecessary additional work such as | |
335 | * memcpy's that could be avoided. | |
336 | */ | |
337 | if (driver_byte(result) != 0 && /* An error occurred */ | |
338 | (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ | |
339 | switch (SCpnt->sense_buffer[2]) { | |
340 | case MEDIUM_ERROR: | |
341 | case VOLUME_OVERFLOW: | |
342 | case ILLEGAL_REQUEST: | |
343 | if (!(SCpnt->sense_buffer[0] & 0x90)) | |
344 | break; | |
1da177e4 LT |
345 | error_sector = (SCpnt->sense_buffer[3] << 24) | |
346 | (SCpnt->sense_buffer[4] << 16) | | |
347 | (SCpnt->sense_buffer[5] << 8) | | |
348 | SCpnt->sense_buffer[6]; | |
349 | if (SCpnt->request->bio != NULL) | |
350 | block_sectors = | |
351 | bio_sectors(SCpnt->request->bio); | |
352 | if (block_sectors < 4) | |
353 | block_sectors = 4; | |
354 | if (cd->device->sector_size == 2048) | |
355 | error_sector <<= 2; | |
356 | error_sector &= ~(block_sectors - 1); | |
83096ebf TH |
357 | good_bytes = (error_sector - |
358 | blk_rq_pos(SCpnt->request)) << 9; | |
1da177e4 LT |
359 | if (good_bytes < 0 || good_bytes >= this_count) |
360 | good_bytes = 0; | |
361 | /* | |
362 | * The SCSI specification allows for the value | |
363 | * returned by READ CAPACITY to be up to 75 2K | |
364 | * sectors past the last readable block. | |
365 | * Therefore, if we hit a medium error within the | |
366 | * last 75 2K sectors, we decrease the saved size | |
367 | * value. | |
368 | */ | |
369 | if (error_sector < get_capacity(cd->disk) && | |
370 | cd->capacity - error_sector < 4 * 75) | |
371 | set_capacity(cd->disk, error_sector); | |
372 | break; | |
373 | ||
374 | case RECOVERED_ERROR: | |
1da177e4 LT |
375 | good_bytes = this_count; |
376 | break; | |
377 | ||
378 | default: | |
379 | break; | |
380 | } | |
381 | } | |
382 | ||
7b3d9545 | 383 | return good_bytes; |
1da177e4 LT |
384 | } |
385 | ||
a1b73fc1 | 386 | static int sr_init_command(struct scsi_cmnd *SCpnt) |
1da177e4 | 387 | { |
242f9dcb | 388 | int block = 0, this_count, s_size; |
7f9a6bc4 | 389 | struct scsi_cd *cd; |
a1b73fc1 | 390 | struct request *rq = SCpnt->request; |
7f9a6bc4 JB |
391 | int ret; |
392 | ||
3c356bde | 393 | ret = scsi_init_io(SCpnt); |
7f9a6bc4 JB |
394 | if (ret != BLKPREP_OK) |
395 | goto out; | |
0624cbb1 | 396 | WARN_ON_ONCE(SCpnt != rq->special); |
7f9a6bc4 JB |
397 | cd = scsi_cd(rq->rq_disk); |
398 | ||
399 | /* from here on until we're complete, any goto out | |
400 | * is used for a killable error condition */ | |
401 | ret = BLKPREP_KILL; | |
1da177e4 | 402 | |
96eefad2 HR |
403 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
404 | "Doing sr request, block = %d\n", block)); | |
1da177e4 LT |
405 | |
406 | if (!cd->device || !scsi_device_online(cd->device)) { | |
96eefad2 HR |
407 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
408 | "Finishing %u sectors\n", blk_rq_sectors(rq))); | |
409 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, | |
410 | "Retry with 0x%p\n", SCpnt)); | |
7f9a6bc4 | 411 | goto out; |
1da177e4 LT |
412 | } |
413 | ||
414 | if (cd->device->changed) { | |
415 | /* | |
416 | * quietly refuse to do anything to a changed disc until the | |
417 | * changed bit has been reset | |
418 | */ | |
7f9a6bc4 | 419 | goto out; |
1da177e4 LT |
420 | } |
421 | ||
1da177e4 LT |
422 | /* |
423 | * we do lazy blocksize switching (when reading XA sectors, | |
424 | * see CDROMREADMODE2 ioctl) | |
425 | */ | |
426 | s_size = cd->device->sector_size; | |
427 | if (s_size > 2048) { | |
428 | if (!in_interrupt()) | |
429 | sr_set_blocklength(cd, 2048); | |
430 | else | |
96eefad2 HR |
431 | scmd_printk(KERN_INFO, SCpnt, |
432 | "can't switch blocksize: in interrupt\n"); | |
1da177e4 LT |
433 | } |
434 | ||
435 | if (s_size != 512 && s_size != 1024 && s_size != 2048) { | |
3bf743e7 | 436 | scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); |
7f9a6bc4 | 437 | goto out; |
1da177e4 LT |
438 | } |
439 | ||
aebf526b CH |
440 | switch (req_op(rq)) { |
441 | case REQ_OP_WRITE: | |
fd2eb903 | 442 | if (!cd->writeable) |
7f9a6bc4 | 443 | goto out; |
1da177e4 | 444 | SCpnt->cmnd[0] = WRITE_10; |
96eefad2 | 445 | cd->cdi.media_written = 1; |
aebf526b CH |
446 | break; |
447 | case REQ_OP_READ: | |
1da177e4 | 448 | SCpnt->cmnd[0] = READ_10; |
aebf526b CH |
449 | break; |
450 | default: | |
7f9a6bc4 JB |
451 | blk_dump_rq_flags(rq, "Unknown sr command"); |
452 | goto out; | |
1da177e4 LT |
453 | } |
454 | ||
455 | { | |
30b0c37b BH |
456 | struct scatterlist *sg; |
457 | int i, size = 0, sg_count = scsi_sg_count(SCpnt); | |
1da177e4 | 458 | |
30b0c37b BH |
459 | scsi_for_each_sg(SCpnt, sg, sg_count, i) |
460 | size += sg->length; | |
461 | ||
462 | if (size != scsi_bufflen(SCpnt)) { | |
3bf743e7 JG |
463 | scmd_printk(KERN_ERR, SCpnt, |
464 | "mismatch count %d, bytes %d\n", | |
30b0c37b BH |
465 | size, scsi_bufflen(SCpnt)); |
466 | if (scsi_bufflen(SCpnt) > size) | |
467 | SCpnt->sdb.length = size; | |
1da177e4 LT |
468 | } |
469 | } | |
470 | ||
471 | /* | |
472 | * request doesn't start on hw block boundary, add scatter pads | |
473 | */ | |
83096ebf | 474 | if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || |
30b0c37b | 475 | (scsi_bufflen(SCpnt) % s_size)) { |
3bf743e7 | 476 | scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); |
7f9a6bc4 | 477 | goto out; |
1da177e4 LT |
478 | } |
479 | ||
30b0c37b | 480 | this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); |
1da177e4 LT |
481 | |
482 | ||
96eefad2 HR |
483 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
484 | "%s %d/%u 512 byte blocks.\n", | |
485 | (rq_data_dir(rq) == WRITE) ? | |
1da177e4 | 486 | "writing" : "reading", |
96eefad2 | 487 | this_count, blk_rq_sectors(rq))); |
1da177e4 LT |
488 | |
489 | SCpnt->cmnd[1] = 0; | |
83096ebf | 490 | block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); |
1da177e4 LT |
491 | |
492 | if (this_count > 0xffff) { | |
493 | this_count = 0xffff; | |
30b0c37b | 494 | SCpnt->sdb.length = this_count * s_size; |
1da177e4 LT |
495 | } |
496 | ||
497 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; | |
498 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
499 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
500 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
501 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
502 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
503 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
504 | ||
505 | /* | |
506 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
507 | * host adapter, it's safe to assume that we can at least transfer | |
508 | * this many bytes between each connect / disconnect. | |
509 | */ | |
510 | SCpnt->transfersize = cd->device->sector_size; | |
511 | SCpnt->underflow = this_count << 9; | |
1da177e4 | 512 | SCpnt->allowed = MAX_RETRIES; |
1da177e4 | 513 | |
1da177e4 LT |
514 | /* |
515 | * This indicates that the command is ready from our end to be | |
516 | * queued. | |
517 | */ | |
7f9a6bc4 JB |
518 | ret = BLKPREP_OK; |
519 | out: | |
a1b73fc1 | 520 | return ret; |
1da177e4 LT |
521 | } |
522 | ||
40cc51be | 523 | static int sr_block_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 524 | { |
6e9624b8 | 525 | struct scsi_cd *cd; |
1214fd7b | 526 | struct scsi_device *sdev; |
40cc51be | 527 | int ret = -ENXIO; |
1da177e4 | 528 | |
1214fd7b BVA |
529 | cd = scsi_cd_get(bdev->bd_disk); |
530 | if (!cd) | |
531 | goto out; | |
532 | ||
533 | sdev = cd->device; | |
534 | scsi_autopm_get_device(sdev); | |
2bbea6e1 ML |
535 | check_disk_change(bdev); |
536 | ||
2a48fc0a | 537 | mutex_lock(&sr_mutex); |
1214fd7b | 538 | ret = cdrom_open(&cd->cdi, bdev, mode); |
2a48fc0a | 539 | mutex_unlock(&sr_mutex); |
1214fd7b BVA |
540 | |
541 | scsi_autopm_put_device(sdev); | |
542 | if (ret) | |
543 | scsi_cd_put(cd); | |
544 | ||
545 | out: | |
1da177e4 LT |
546 | return ret; |
547 | } | |
548 | ||
db2a144b | 549 | static void sr_block_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 550 | { |
40cc51be | 551 | struct scsi_cd *cd = scsi_cd(disk); |
2a48fc0a | 552 | mutex_lock(&sr_mutex); |
40cc51be | 553 | cdrom_release(&cd->cdi, mode); |
1da177e4 | 554 | scsi_cd_put(cd); |
2a48fc0a | 555 | mutex_unlock(&sr_mutex); |
1da177e4 LT |
556 | } |
557 | ||
40cc51be | 558 | static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
1da177e4 LT |
559 | unsigned long arg) |
560 | { | |
40cc51be | 561 | struct scsi_cd *cd = scsi_cd(bdev->bd_disk); |
1da177e4 | 562 | struct scsi_device *sdev = cd->device; |
6a2900b6 CH |
563 | void __user *argp = (void __user *)arg; |
564 | int ret; | |
1da177e4 | 565 | |
2a48fc0a | 566 | mutex_lock(&sr_mutex); |
8a6cfeb6 | 567 | |
906d15fb CH |
568 | ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, |
569 | (mode & FMODE_NDELAY) != 0); | |
570 | if (ret) | |
571 | goto out; | |
572 | ||
1214fd7b BVA |
573 | scsi_autopm_get_device(sdev); |
574 | ||
6a2900b6 CH |
575 | /* |
576 | * Send SCSI addressing ioctls directly to mid level, send other | |
577 | * ioctls to cdrom/block level. | |
578 | */ | |
579 | switch (cmd) { | |
580 | case SCSI_IOCTL_GET_IDLUN: | |
581 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
8a6cfeb6 | 582 | ret = scsi_ioctl(sdev, cmd, argp); |
1214fd7b | 583 | goto put; |
1da177e4 | 584 | } |
6a2900b6 | 585 | |
40cc51be | 586 | ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); |
6397256b | 587 | if (ret != -ENOSYS) |
1214fd7b | 588 | goto put; |
6a2900b6 | 589 | |
8a6cfeb6 AB |
590 | ret = scsi_ioctl(sdev, cmd, argp); |
591 | ||
1214fd7b BVA |
592 | put: |
593 | scsi_autopm_put_device(sdev); | |
594 | ||
8a6cfeb6 | 595 | out: |
2a48fc0a | 596 | mutex_unlock(&sr_mutex); |
8a6cfeb6 | 597 | return ret; |
1da177e4 LT |
598 | } |
599 | ||
93aae17a TH |
600 | static unsigned int sr_block_check_events(struct gendisk *disk, |
601 | unsigned int clearing) | |
1da177e4 | 602 | { |
2d097c50 JA |
603 | unsigned int ret = 0; |
604 | struct scsi_cd *cd; | |
6c7f1e2f | 605 | |
2d097c50 JA |
606 | cd = scsi_cd_get(disk); |
607 | if (!cd) | |
6627b38f | 608 | return 0; |
6c7f1e2f | 609 | |
2d097c50 JA |
610 | if (!atomic_read(&cd->device->disk_events_disable_depth)) |
611 | ret = cdrom_check_events(&cd->cdi, clearing); | |
612 | ||
613 | scsi_cd_put(cd); | |
614 | return ret; | |
93aae17a TH |
615 | } |
616 | ||
617 | static int sr_block_revalidate_disk(struct gendisk *disk) | |
618 | { | |
93aae17a | 619 | struct scsi_sense_hdr sshdr; |
2d097c50 JA |
620 | struct scsi_cd *cd; |
621 | ||
622 | cd = scsi_cd_get(disk); | |
623 | if (!cd) | |
624 | return -ENXIO; | |
93aae17a TH |
625 | |
626 | /* if the unit is not ready, nothing more to do */ | |
627 | if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) | |
6c7f1e2f | 628 | goto out; |
93aae17a TH |
629 | |
630 | sr_cd_check(&cd->cdi); | |
631 | get_sectorsize(cd); | |
6c7f1e2f | 632 | out: |
2d097c50 | 633 | scsi_cd_put(cd); |
93aae17a | 634 | return 0; |
1da177e4 LT |
635 | } |
636 | ||
83d5cde4 | 637 | static const struct block_device_operations sr_bdops = |
1da177e4 LT |
638 | { |
639 | .owner = THIS_MODULE, | |
40cc51be AV |
640 | .open = sr_block_open, |
641 | .release = sr_block_release, | |
8a6cfeb6 | 642 | .ioctl = sr_block_ioctl, |
93aae17a TH |
643 | .check_events = sr_block_check_events, |
644 | .revalidate_disk = sr_block_revalidate_disk, | |
1da177e4 LT |
645 | /* |
646 | * No compat_ioctl for now because sr_block_ioctl never | |
25985edc | 647 | * seems to pass arbitrary ioctls down to host drivers. |
1da177e4 LT |
648 | */ |
649 | }; | |
650 | ||
651 | static int sr_open(struct cdrom_device_info *cdi, int purpose) | |
652 | { | |
653 | struct scsi_cd *cd = cdi->handle; | |
654 | struct scsi_device *sdev = cd->device; | |
655 | int retval; | |
656 | ||
657 | /* | |
658 | * If the device is in error recovery, wait until it is done. | |
659 | * If the device is offline, then disallow any access to it. | |
660 | */ | |
661 | retval = -ENXIO; | |
662 | if (!scsi_block_when_processing_errors(sdev)) | |
663 | goto error_out; | |
664 | ||
1da177e4 LT |
665 | return 0; |
666 | ||
667 | error_out: | |
668 | return retval; | |
669 | } | |
670 | ||
671 | static void sr_release(struct cdrom_device_info *cdi) | |
672 | { | |
673 | struct scsi_cd *cd = cdi->handle; | |
674 | ||
675 | if (cd->device->sector_size > 2048) | |
676 | sr_set_blocklength(cd, 2048); | |
677 | ||
678 | } | |
679 | ||
680 | static int sr_probe(struct device *dev) | |
681 | { | |
682 | struct scsi_device *sdev = to_scsi_device(dev); | |
683 | struct gendisk *disk; | |
684 | struct scsi_cd *cd; | |
685 | int minor, error; | |
686 | ||
6fe8c1db | 687 | scsi_autopm_get_device(sdev); |
1da177e4 LT |
688 | error = -ENODEV; |
689 | if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) | |
690 | goto fail; | |
691 | ||
692 | error = -ENOMEM; | |
24669f75 | 693 | cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
1da177e4 LT |
694 | if (!cd) |
695 | goto fail; | |
1da177e4 LT |
696 | |
697 | kref_init(&cd->kref); | |
698 | ||
699 | disk = alloc_disk(1); | |
700 | if (!disk) | |
701 | goto fail_free; | |
702 | ||
703 | spin_lock(&sr_index_lock); | |
704 | minor = find_first_zero_bit(sr_index_bits, SR_DISKS); | |
705 | if (minor == SR_DISKS) { | |
706 | spin_unlock(&sr_index_lock); | |
707 | error = -EBUSY; | |
708 | goto fail_put; | |
709 | } | |
710 | __set_bit(minor, sr_index_bits); | |
711 | spin_unlock(&sr_index_lock); | |
712 | ||
713 | disk->major = SCSI_CDROM_MAJOR; | |
714 | disk->first_minor = minor; | |
715 | sprintf(disk->disk_name, "sr%d", minor); | |
716 | disk->fops = &sr_bdops; | |
d4dc210f | 717 | disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; |
93aae17a | 718 | disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; |
1da177e4 | 719 | |
242f9dcb JA |
720 | blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); |
721 | ||
1da177e4 LT |
722 | cd->device = sdev; |
723 | cd->disk = disk; | |
724 | cd->driver = &sr_template; | |
725 | cd->disk = disk; | |
726 | cd->capacity = 0x1fffff; | |
1da177e4 | 727 | cd->device->changed = 1; /* force recheck CD type */ |
93aae17a | 728 | cd->media_present = 1; |
1da177e4 LT |
729 | cd->use = 1; |
730 | cd->readcd_known = 0; | |
731 | cd->readcd_cdda = 0; | |
732 | ||
733 | cd->cdi.ops = &sr_dops; | |
734 | cd->cdi.handle = cd; | |
735 | cd->cdi.mask = 0; | |
736 | cd->cdi.capacity = 1; | |
737 | sprintf(cd->cdi.name, "sr%d", minor); | |
738 | ||
739 | sdev->sector_size = 2048; /* A guess, just in case */ | |
740 | ||
741 | /* FIXME: need to handle a get_capabilities failure properly ?? */ | |
742 | get_capabilities(cd); | |
743 | sr_vendor_init(cd); | |
744 | ||
1da177e4 LT |
745 | set_capacity(disk, cd->capacity); |
746 | disk->private_data = &cd->driver; | |
747 | disk->queue = sdev->request_queue; | |
748 | cd->cdi.disk = disk; | |
749 | ||
750 | if (register_cdrom(&cd->cdi)) | |
751 | goto fail_put; | |
752 | ||
6627b38f AL |
753 | /* |
754 | * Initialize block layer runtime PM stuffs before the | |
755 | * periodic event checking request gets started in add_disk. | |
756 | */ | |
757 | blk_pm_runtime_init(sdev->request_queue, dev); | |
758 | ||
1da177e4 LT |
759 | dev_set_drvdata(dev, cd); |
760 | disk->flags |= GENHD_FL_REMOVABLE; | |
0d52c756 | 761 | device_add_disk(&sdev->sdev_gendev, disk); |
1da177e4 | 762 | |
9ccfc756 JB |
763 | sdev_printk(KERN_DEBUG, sdev, |
764 | "Attached scsi CD-ROM %s\n", cd->cdi.name); | |
6c7f1e2f AL |
765 | scsi_autopm_put_device(cd->device); |
766 | ||
1da177e4 LT |
767 | return 0; |
768 | ||
769 | fail_put: | |
770 | put_disk(disk); | |
771 | fail_free: | |
772 | kfree(cd); | |
773 | fail: | |
6fe8c1db | 774 | scsi_autopm_put_device(sdev); |
1da177e4 LT |
775 | return error; |
776 | } | |
777 | ||
778 | ||
779 | static void get_sectorsize(struct scsi_cd *cd) | |
780 | { | |
781 | unsigned char cmd[10]; | |
62858dac | 782 | unsigned char buffer[8]; |
1da177e4 LT |
783 | int the_result, retries = 3; |
784 | int sector_size; | |
165125e1 | 785 | struct request_queue *queue; |
1da177e4 | 786 | |
1da177e4 LT |
787 | do { |
788 | cmd[0] = READ_CAPACITY; | |
789 | memset((void *) &cmd[1], 0, 9); | |
62858dac | 790 | memset(buffer, 0, sizeof(buffer)); |
1da177e4 LT |
791 | |
792 | /* Do the command and wait.. */ | |
820732b5 | 793 | the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
62858dac | 794 | buffer, sizeof(buffer), NULL, |
f4f4e47e | 795 | SR_TIMEOUT, MAX_RETRIES, NULL); |
1da177e4 | 796 | |
1da177e4 LT |
797 | retries--; |
798 | ||
799 | } while (the_result && retries); | |
800 | ||
801 | ||
1da177e4 LT |
802 | if (the_result) { |
803 | cd->capacity = 0x1fffff; | |
804 | sector_size = 2048; /* A guess, just in case */ | |
1da177e4 | 805 | } else { |
5915136d TH |
806 | long last_written; |
807 | ||
808 | cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | | |
809 | (buffer[2] << 8) | buffer[3]); | |
810 | /* | |
811 | * READ_CAPACITY doesn't return the correct size on | |
812 | * certain UDF media. If last_written is larger, use | |
813 | * it instead. | |
814 | * | |
815 | * http://bugzilla.kernel.org/show_bug.cgi?id=9668 | |
816 | */ | |
817 | if (!cdrom_get_last_written(&cd->cdi, &last_written)) | |
818 | cd->capacity = max_t(long, cd->capacity, last_written); | |
819 | ||
1da177e4 LT |
820 | sector_size = (buffer[4] << 24) | |
821 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
822 | switch (sector_size) { | |
823 | /* | |
824 | * HP 4020i CD-Recorder reports 2340 byte sectors | |
825 | * Philips CD-Writers report 2352 byte sectors | |
826 | * | |
827 | * Use 2k sectors for them.. | |
828 | */ | |
829 | case 0: | |
830 | case 2340: | |
831 | case 2352: | |
832 | sector_size = 2048; | |
833 | /* fall through */ | |
834 | case 2048: | |
835 | cd->capacity *= 4; | |
836 | /* fall through */ | |
837 | case 512: | |
838 | break; | |
839 | default: | |
96eefad2 HR |
840 | sr_printk(KERN_INFO, cd, |
841 | "unsupported sector size %d.", sector_size); | |
1da177e4 | 842 | cd->capacity = 0; |
1da177e4 LT |
843 | } |
844 | ||
845 | cd->device->sector_size = sector_size; | |
846 | ||
847 | /* | |
848 | * Add this so that we have the ability to correctly gauge | |
849 | * what the device is capable of. | |
850 | */ | |
1da177e4 LT |
851 | set_capacity(cd->disk, cd->capacity); |
852 | } | |
853 | ||
854 | queue = cd->device->request_queue; | |
e1defc4f | 855 | blk_queue_logical_block_size(queue, sector_size); |
1da177e4 | 856 | |
62858dac | 857 | return; |
1da177e4 LT |
858 | } |
859 | ||
860 | static void get_capabilities(struct scsi_cd *cd) | |
861 | { | |
862 | unsigned char *buffer; | |
863 | struct scsi_mode_data data; | |
820732b5 | 864 | struct scsi_sense_hdr sshdr; |
a00a7862 | 865 | unsigned int ms_len = 128; |
38582a62 | 866 | int rc, n; |
1da177e4 | 867 | |
0ad78200 | 868 | static const char *loadmech[] = |
1da177e4 LT |
869 | { |
870 | "caddy", | |
871 | "tray", | |
872 | "pop-up", | |
873 | "", | |
874 | "changer", | |
875 | "cartridge changer", | |
876 | "", | |
877 | "" | |
878 | }; | |
879 | ||
1da177e4 LT |
880 | |
881 | /* allocate transfer buffer */ | |
882 | buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); | |
883 | if (!buffer) { | |
96eefad2 | 884 | sr_printk(KERN_ERR, cd, "out of memory.\n"); |
1da177e4 LT |
885 | return; |
886 | } | |
887 | ||
38582a62 | 888 | /* eat unit attentions */ |
9f8a2c23 | 889 | scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
1da177e4 LT |
890 | |
891 | /* ask for mode page 0x2a */ | |
a00a7862 | 892 | rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, ms_len, |
1cf72699 | 893 | SR_TIMEOUT, 3, &data, NULL); |
1da177e4 | 894 | |
a00a7862 MP |
895 | if (!scsi_status_is_good(rc) || data.length > ms_len || |
896 | data.header_length + data.block_descriptor_length > data.length) { | |
1da177e4 LT |
897 | /* failed, drive doesn't have capabilities mode page */ |
898 | cd->cdi.speed = 1; | |
899 | cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | | |
bcc1e382 CE |
900 | CDC_DVD | CDC_DVD_RAM | |
901 | CDC_SELECT_DISC | CDC_SELECT_SPEED | | |
902 | CDC_MRW | CDC_MRW_W | CDC_RAM); | |
1da177e4 | 903 | kfree(buffer); |
96eefad2 | 904 | sr_printk(KERN_INFO, cd, "scsi-1 drive"); |
1da177e4 LT |
905 | return; |
906 | } | |
907 | ||
908 | n = data.header_length + data.block_descriptor_length; | |
909 | cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; | |
910 | cd->readcd_known = 1; | |
911 | cd->readcd_cdda = buffer[n + 5] & 0x01; | |
912 | /* print some capability bits */ | |
96eefad2 HR |
913 | sr_printk(KERN_INFO, cd, |
914 | "scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", | |
915 | ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, | |
916 | cd->cdi.speed, | |
917 | buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ | |
918 | buffer[n + 3] & 0x20 ? "dvd-ram " : "", | |
919 | buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ | |
920 | buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ | |
921 | buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ | |
922 | loadmech[buffer[n + 6] >> 5]); | |
1da177e4 LT |
923 | if ((buffer[n + 6] >> 5) == 0) |
924 | /* caddy drives can't close tray... */ | |
925 | cd->cdi.mask |= CDC_CLOSE_TRAY; | |
926 | if ((buffer[n + 2] & 0x8) == 0) | |
927 | /* not a DVD drive */ | |
928 | cd->cdi.mask |= CDC_DVD; | |
96eefad2 | 929 | if ((buffer[n + 3] & 0x20) == 0) |
1da177e4 LT |
930 | /* can't write DVD-RAM media */ |
931 | cd->cdi.mask |= CDC_DVD_RAM; | |
932 | if ((buffer[n + 3] & 0x10) == 0) | |
933 | /* can't write DVD-R media */ | |
934 | cd->cdi.mask |= CDC_DVD_R; | |
935 | if ((buffer[n + 3] & 0x2) == 0) | |
936 | /* can't write CD-RW media */ | |
937 | cd->cdi.mask |= CDC_CD_RW; | |
938 | if ((buffer[n + 3] & 0x1) == 0) | |
939 | /* can't write CD-R media */ | |
940 | cd->cdi.mask |= CDC_CD_R; | |
941 | if ((buffer[n + 6] & 0x8) == 0) | |
942 | /* can't eject */ | |
943 | cd->cdi.mask |= CDC_OPEN_TRAY; | |
944 | ||
945 | if ((buffer[n + 6] >> 5) == mechtype_individual_changer || | |
946 | (buffer[n + 6] >> 5) == mechtype_cartridge_changer) | |
947 | cd->cdi.capacity = | |
948 | cdrom_number_of_slots(&cd->cdi); | |
949 | if (cd->cdi.capacity <= 1) | |
950 | /* not a changer */ | |
951 | cd->cdi.mask |= CDC_SELECT_DISC; | |
952 | /*else I don't think it can close its tray | |
953 | cd->cdi.mask |= CDC_CLOSE_TRAY; */ | |
954 | ||
955 | /* | |
956 | * if DVD-RAM, MRW-W or CD-RW, we are randomly writable | |
957 | */ | |
958 | if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != | |
959 | (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { | |
fd2eb903 | 960 | cd->writeable = 1; |
1da177e4 LT |
961 | } |
962 | ||
1da177e4 LT |
963 | kfree(buffer); |
964 | } | |
965 | ||
966 | /* | |
967 | * sr_packet() is the entry point for the generic commands generated | |
96eefad2 | 968 | * by the Uniform CD-ROM layer. |
1da177e4 LT |
969 | */ |
970 | static int sr_packet(struct cdrom_device_info *cdi, | |
971 | struct packet_command *cgc) | |
972 | { | |
8e04d805 HG |
973 | struct scsi_cd *cd = cdi->handle; |
974 | struct scsi_device *sdev = cd->device; | |
975 | ||
976 | if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) | |
977 | return -EDRIVE_CANT_DO_THIS; | |
978 | ||
1da177e4 LT |
979 | if (cgc->timeout <= 0) |
980 | cgc->timeout = IOCTL_TIMEOUT; | |
981 | ||
8e04d805 | 982 | sr_do_ioctl(cd, cgc); |
1da177e4 LT |
983 | |
984 | return cgc->stat; | |
985 | } | |
986 | ||
987 | /** | |
988 | * sr_kref_release - Called to free the scsi_cd structure | |
989 | * @kref: pointer to embedded kref | |
990 | * | |
0b950672 | 991 | * sr_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
992 | * called on last put, you should always use the scsi_cd_get() |
993 | * scsi_cd_put() helpers which manipulate the semaphore directly | |
994 | * and never do a direct kref_put(). | |
995 | **/ | |
996 | static void sr_kref_release(struct kref *kref) | |
997 | { | |
998 | struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); | |
999 | struct gendisk *disk = cd->disk; | |
1000 | ||
1001 | spin_lock(&sr_index_lock); | |
f331c029 | 1002 | clear_bit(MINOR(disk_devt(disk)), sr_index_bits); |
1da177e4 LT |
1003 | spin_unlock(&sr_index_lock); |
1004 | ||
1005 | unregister_cdrom(&cd->cdi); | |
1006 | ||
1007 | disk->private_data = NULL; | |
1008 | ||
1009 | put_disk(disk); | |
1010 | ||
1011 | kfree(cd); | |
1012 | } | |
1013 | ||
1014 | static int sr_remove(struct device *dev) | |
1015 | { | |
1016 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
1017 | ||
6c7f1e2f AL |
1018 | scsi_autopm_get_device(cd->device); |
1019 | ||
1da177e4 | 1020 | del_gendisk(cd->disk); |
13b43891 | 1021 | dev_set_drvdata(dev, NULL); |
1da177e4 | 1022 | |
0b950672 | 1023 | mutex_lock(&sr_ref_mutex); |
1da177e4 | 1024 | kref_put(&cd->kref, sr_kref_release); |
0b950672 | 1025 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
1026 | |
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | static int __init init_sr(void) | |
1031 | { | |
1032 | int rc; | |
1033 | ||
1034 | rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1035 | if (rc) | |
1036 | return rc; | |
da3962fe AM |
1037 | rc = scsi_register_driver(&sr_template.gendrv); |
1038 | if (rc) | |
1039 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1040 | ||
1041 | return rc; | |
1da177e4 LT |
1042 | } |
1043 | ||
1044 | static void __exit exit_sr(void) | |
1045 | { | |
1046 | scsi_unregister_driver(&sr_template.gendrv); | |
1047 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1048 | } | |
1049 | ||
1050 | module_init(init_sr); | |
1051 | module_exit(exit_sr); | |
1052 | MODULE_LICENSE("GPL"); |