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> |
1da177e4 LT |
49 | #include <asm/uaccess.h> |
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 *); | |
7b3d9545 | 82 | static int sr_done(struct scsi_cmnd *); |
6c7f1e2f AL |
83 | static int sr_runtime_suspend(struct device *dev); |
84 | ||
85 | static struct dev_pm_ops sr_pm_ops = { | |
86 | .runtime_suspend = sr_runtime_suspend, | |
87 | }; | |
1da177e4 LT |
88 | |
89 | static struct scsi_driver sr_template = { | |
90 | .owner = THIS_MODULE, | |
91 | .gendrv = { | |
92 | .name = "sr", | |
93 | .probe = sr_probe, | |
94 | .remove = sr_remove, | |
6c7f1e2f | 95 | .pm = &sr_pm_ops, |
1da177e4 | 96 | }, |
7b3d9545 | 97 | .done = sr_done, |
1da177e4 LT |
98 | }; |
99 | ||
100 | static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; | |
101 | static DEFINE_SPINLOCK(sr_index_lock); | |
102 | ||
103 | /* This semaphore is used to mediate the 0->1 reference get in the | |
104 | * face of object destruction (i.e. we can't allow a get on an | |
105 | * object after last put) */ | |
0b950672 | 106 | static DEFINE_MUTEX(sr_ref_mutex); |
1da177e4 LT |
107 | |
108 | static int sr_open(struct cdrom_device_info *, int); | |
109 | static void sr_release(struct cdrom_device_info *); | |
110 | ||
111 | static void get_sectorsize(struct scsi_cd *); | |
112 | static void get_capabilities(struct scsi_cd *); | |
113 | ||
93aae17a TH |
114 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
115 | unsigned int clearing, int slot); | |
1da177e4 LT |
116 | static int sr_packet(struct cdrom_device_info *, struct packet_command *); |
117 | ||
118 | static struct cdrom_device_ops sr_dops = { | |
119 | .open = sr_open, | |
120 | .release = sr_release, | |
121 | .drive_status = sr_drive_status, | |
93aae17a | 122 | .check_events = sr_check_events, |
1da177e4 LT |
123 | .tray_move = sr_tray_move, |
124 | .lock_door = sr_lock_door, | |
125 | .select_speed = sr_select_speed, | |
126 | .get_last_session = sr_get_last_session, | |
127 | .get_mcn = sr_get_mcn, | |
128 | .reset = sr_reset, | |
129 | .audio_ioctl = sr_audio_ioctl, | |
1da177e4 LT |
130 | .capability = SR_CAPABILITIES, |
131 | .generic_packet = sr_packet, | |
132 | }; | |
133 | ||
134 | static void sr_kref_release(struct kref *kref); | |
135 | ||
136 | static inline struct scsi_cd *scsi_cd(struct gendisk *disk) | |
137 | { | |
138 | return container_of(disk->private_data, struct scsi_cd, driver); | |
139 | } | |
140 | ||
6c7f1e2f AL |
141 | static int sr_runtime_suspend(struct device *dev) |
142 | { | |
143 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
144 | ||
145 | if (cd->media_present) | |
146 | return -EBUSY; | |
147 | else | |
148 | return 0; | |
149 | } | |
150 | ||
1da177e4 LT |
151 | /* |
152 | * The get and put routines for the struct scsi_cd. Note this entity | |
153 | * has a scsi_device pointer and owns a reference to this. | |
154 | */ | |
155 | static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) | |
156 | { | |
157 | struct scsi_cd *cd = NULL; | |
158 | ||
0b950672 | 159 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
160 | if (disk->private_data == NULL) |
161 | goto out; | |
162 | cd = scsi_cd(disk); | |
163 | kref_get(&cd->kref); | |
6627b38f AL |
164 | if (scsi_device_get(cd->device)) { |
165 | kref_put(&cd->kref, sr_kref_release); | |
166 | cd = NULL; | |
167 | } | |
1da177e4 | 168 | out: |
0b950672 | 169 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
170 | return cd; |
171 | } | |
172 | ||
858119e1 | 173 | static void scsi_cd_put(struct scsi_cd *cd) |
1da177e4 LT |
174 | { |
175 | struct scsi_device *sdev = cd->device; | |
176 | ||
0b950672 | 177 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
178 | kref_put(&cd->kref, sr_kref_release); |
179 | scsi_device_put(sdev); | |
0b950672 | 180 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
181 | } |
182 | ||
93aae17a TH |
183 | static unsigned int sr_get_events(struct scsi_device *sdev) |
184 | { | |
185 | u8 buf[8]; | |
186 | u8 cmd[] = { GET_EVENT_STATUS_NOTIFICATION, | |
187 | 1, /* polled */ | |
188 | 0, 0, /* reserved */ | |
189 | 1 << 4, /* notification class: media */ | |
190 | 0, 0, /* reserved */ | |
191 | 0, sizeof(buf), /* allocation length */ | |
192 | 0, /* control */ | |
193 | }; | |
194 | struct event_header *eh = (void *)buf; | |
195 | struct media_event_desc *med = (void *)(buf + 4); | |
196 | struct scsi_sense_hdr sshdr; | |
197 | int result; | |
198 | ||
199 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buf, sizeof(buf), | |
200 | &sshdr, SR_TIMEOUT, MAX_RETRIES, NULL); | |
201 | if (scsi_sense_valid(&sshdr) && sshdr.sense_key == UNIT_ATTENTION) | |
202 | return DISK_EVENT_MEDIA_CHANGE; | |
203 | ||
204 | if (result || be16_to_cpu(eh->data_len) < sizeof(*med)) | |
205 | return 0; | |
206 | ||
207 | if (eh->nea || eh->notification_class != 0x4) | |
208 | return 0; | |
209 | ||
210 | if (med->media_event_code == 1) | |
211 | return DISK_EVENT_EJECT_REQUEST; | |
212 | else if (med->media_event_code == 2) | |
213 | return DISK_EVENT_MEDIA_CHANGE; | |
214 | return 0; | |
215 | } | |
216 | ||
1da177e4 | 217 | /* |
93aae17a TH |
218 | * This function checks to see if the media has been changed or eject |
219 | * button has been pressed. It is possible that we have already | |
220 | * sensed a change, or the drive may have sensed one and not yet | |
221 | * reported it. The past events are accumulated in sdev->changed and | |
222 | * returned together with the current state. | |
1da177e4 | 223 | */ |
93aae17a TH |
224 | static unsigned int sr_check_events(struct cdrom_device_info *cdi, |
225 | unsigned int clearing, int slot) | |
1da177e4 LT |
226 | { |
227 | struct scsi_cd *cd = cdi->handle; | |
93aae17a TH |
228 | bool last_present; |
229 | struct scsi_sense_hdr sshdr; | |
230 | unsigned int events; | |
231 | int ret; | |
1da177e4 | 232 | |
93aae17a TH |
233 | /* no changer support */ |
234 | if (CDSL_CURRENT != slot) | |
235 | return 0; | |
236 | ||
237 | events = sr_get_events(cd->device); | |
79b9677d KS |
238 | cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; |
239 | ||
240 | /* | |
241 | * If earlier GET_EVENT_STATUS_NOTIFICATION and TUR did not agree | |
242 | * for several times in a row. We rely on TUR only for this likely | |
243 | * broken device, to prevent generating incorrect media changed | |
244 | * events for every open(). | |
245 | */ | |
246 | if (cd->ignore_get_event) { | |
247 | events &= ~DISK_EVENT_MEDIA_CHANGE; | |
248 | goto do_tur; | |
249 | } | |
250 | ||
93aae17a TH |
251 | /* |
252 | * GET_EVENT_STATUS_NOTIFICATION is enough unless MEDIA_CHANGE | |
253 | * is being cleared. Note that there are devices which hang | |
254 | * if asked to execute TUR repeatedly. | |
255 | */ | |
79b9677d KS |
256 | if (cd->device->changed) { |
257 | events |= DISK_EVENT_MEDIA_CHANGE; | |
258 | cd->device->changed = 0; | |
259 | cd->tur_changed = true; | |
260 | } | |
93aae17a | 261 | |
79b9677d KS |
262 | if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) |
263 | return events; | |
264 | do_tur: | |
93aae17a TH |
265 | /* let's see whether the media is there with TUR */ |
266 | last_present = cd->media_present; | |
267 | ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); | |
1da177e4 | 268 | |
638428ec TH |
269 | /* |
270 | * Media is considered to be present if TUR succeeds or fails with | |
271 | * sense data indicating something other than media-not-present | |
272 | * (ASC 0x3a). | |
273 | */ | |
93aae17a TH |
274 | cd->media_present = scsi_status_is_good(ret) || |
275 | (scsi_sense_valid(&sshdr) && sshdr.asc != 0x3a); | |
1da177e4 | 276 | |
93aae17a | 277 | if (last_present != cd->media_present) |
79b9677d KS |
278 | cd->device->changed = 1; |
279 | ||
93aae17a TH |
280 | if (cd->device->changed) { |
281 | events |= DISK_EVENT_MEDIA_CHANGE; | |
282 | cd->device->changed = 0; | |
79b9677d KS |
283 | cd->tur_changed = true; |
284 | } | |
285 | ||
286 | if (cd->ignore_get_event) | |
287 | return events; | |
288 | ||
289 | /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ | |
290 | if (!cd->tur_changed) { | |
291 | if (cd->get_event_changed) { | |
292 | if (cd->tur_mismatch++ > 8) { | |
293 | sdev_printk(KERN_WARNING, cd->device, | |
294 | "GET_EVENT and TUR disagree continuously, suppress GET_EVENT events\n"); | |
295 | cd->ignore_get_event = true; | |
296 | } | |
297 | } else { | |
298 | cd->tur_mismatch = 0; | |
299 | } | |
1da177e4 | 300 | } |
79b9677d KS |
301 | cd->tur_changed = false; |
302 | cd->get_event_changed = false; | |
285e9670 | 303 | |
93aae17a | 304 | return events; |
1da177e4 | 305 | } |
93aae17a | 306 | |
1da177e4 | 307 | /* |
7b3d9545 | 308 | * sr_done is the interrupt routine for the device driver. |
1da177e4 | 309 | * |
7b3d9545 | 310 | * It will be notified on the end of a SCSI read / write, and will take one |
1da177e4 LT |
311 | * of several actions based on success or failure. |
312 | */ | |
7b3d9545 | 313 | static int sr_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
314 | { |
315 | int result = SCpnt->result; | |
30b0c37b | 316 | int this_count = scsi_bufflen(SCpnt); |
1da177e4 LT |
317 | int good_bytes = (result == 0 ? this_count : 0); |
318 | int block_sectors = 0; | |
319 | long error_sector; | |
320 | struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); | |
321 | ||
322 | #ifdef DEBUG | |
323 | printk("sr.c done: %x\n", result); | |
324 | #endif | |
325 | ||
326 | /* | |
327 | * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial | |
328 | * success. Since this is a relatively rare error condition, no | |
329 | * care is taken to avoid unnecessary additional work such as | |
330 | * memcpy's that could be avoided. | |
331 | */ | |
332 | if (driver_byte(result) != 0 && /* An error occurred */ | |
333 | (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ | |
334 | switch (SCpnt->sense_buffer[2]) { | |
335 | case MEDIUM_ERROR: | |
336 | case VOLUME_OVERFLOW: | |
337 | case ILLEGAL_REQUEST: | |
338 | if (!(SCpnt->sense_buffer[0] & 0x90)) | |
339 | break; | |
1da177e4 LT |
340 | error_sector = (SCpnt->sense_buffer[3] << 24) | |
341 | (SCpnt->sense_buffer[4] << 16) | | |
342 | (SCpnt->sense_buffer[5] << 8) | | |
343 | SCpnt->sense_buffer[6]; | |
344 | if (SCpnt->request->bio != NULL) | |
345 | block_sectors = | |
346 | bio_sectors(SCpnt->request->bio); | |
347 | if (block_sectors < 4) | |
348 | block_sectors = 4; | |
349 | if (cd->device->sector_size == 2048) | |
350 | error_sector <<= 2; | |
351 | error_sector &= ~(block_sectors - 1); | |
83096ebf TH |
352 | good_bytes = (error_sector - |
353 | blk_rq_pos(SCpnt->request)) << 9; | |
1da177e4 LT |
354 | if (good_bytes < 0 || good_bytes >= this_count) |
355 | good_bytes = 0; | |
356 | /* | |
357 | * The SCSI specification allows for the value | |
358 | * returned by READ CAPACITY to be up to 75 2K | |
359 | * sectors past the last readable block. | |
360 | * Therefore, if we hit a medium error within the | |
361 | * last 75 2K sectors, we decrease the saved size | |
362 | * value. | |
363 | */ | |
364 | if (error_sector < get_capacity(cd->disk) && | |
365 | cd->capacity - error_sector < 4 * 75) | |
366 | set_capacity(cd->disk, error_sector); | |
367 | break; | |
368 | ||
369 | case RECOVERED_ERROR: | |
1da177e4 LT |
370 | good_bytes = this_count; |
371 | break; | |
372 | ||
373 | default: | |
374 | break; | |
375 | } | |
376 | } | |
377 | ||
7b3d9545 | 378 | return good_bytes; |
1da177e4 LT |
379 | } |
380 | ||
7f9a6bc4 | 381 | static int sr_prep_fn(struct request_queue *q, struct request *rq) |
1da177e4 | 382 | { |
242f9dcb | 383 | int block = 0, this_count, s_size; |
7f9a6bc4 JB |
384 | struct scsi_cd *cd; |
385 | struct scsi_cmnd *SCpnt; | |
386 | struct scsi_device *sdp = q->queuedata; | |
387 | int ret; | |
388 | ||
389 | if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { | |
390 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); | |
391 | goto out; | |
392 | } else if (rq->cmd_type != REQ_TYPE_FS) { | |
393 | ret = BLKPREP_KILL; | |
394 | goto out; | |
395 | } | |
396 | ret = scsi_setup_fs_cmnd(sdp, rq); | |
397 | if (ret != BLKPREP_OK) | |
398 | goto out; | |
399 | SCpnt = rq->special; | |
400 | cd = scsi_cd(rq->rq_disk); | |
401 | ||
402 | /* from here on until we're complete, any goto out | |
403 | * is used for a killable error condition */ | |
404 | ret = BLKPREP_KILL; | |
1da177e4 LT |
405 | |
406 | SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", | |
407 | cd->disk->disk_name, block)); | |
408 | ||
409 | if (!cd->device || !scsi_device_online(cd->device)) { | |
83096ebf TH |
410 | SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n", |
411 | blk_rq_sectors(rq))); | |
1da177e4 | 412 | SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); |
7f9a6bc4 | 413 | goto out; |
1da177e4 LT |
414 | } |
415 | ||
416 | if (cd->device->changed) { | |
417 | /* | |
418 | * quietly refuse to do anything to a changed disc until the | |
419 | * changed bit has been reset | |
420 | */ | |
7f9a6bc4 | 421 | goto out; |
1da177e4 LT |
422 | } |
423 | ||
1da177e4 LT |
424 | /* |
425 | * we do lazy blocksize switching (when reading XA sectors, | |
426 | * see CDROMREADMODE2 ioctl) | |
427 | */ | |
428 | s_size = cd->device->sector_size; | |
429 | if (s_size > 2048) { | |
430 | if (!in_interrupt()) | |
431 | sr_set_blocklength(cd, 2048); | |
432 | else | |
433 | printk("sr: can't switch blocksize: in interrupt\n"); | |
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 | ||
7f9a6bc4 | 441 | if (rq_data_dir(rq) == WRITE) { |
1da177e4 | 442 | if (!cd->device->writeable) |
7f9a6bc4 | 443 | goto out; |
1da177e4 LT |
444 | SCpnt->cmnd[0] = WRITE_10; |
445 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
446 | cd->cdi.media_written = 1; | |
7f9a6bc4 | 447 | } else if (rq_data_dir(rq) == READ) { |
1da177e4 LT |
448 | SCpnt->cmnd[0] = READ_10; |
449 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
450 | } else { | |
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 | ||
83096ebf | 483 | SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n", |
1da177e4 | 484 | cd->cdi.name, |
7f9a6bc4 | 485 | (rq_data_dir(rq) == WRITE) ? |
1da177e4 | 486 | "writing" : "reading", |
83096ebf | 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: | |
520 | return scsi_prep_return(q, rq, 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; |
40cc51be | 526 | int ret = -ENXIO; |
1da177e4 | 527 | |
2a48fc0a | 528 | mutex_lock(&sr_mutex); |
6e9624b8 | 529 | cd = scsi_cd_get(bdev->bd_disk); |
40cc51be AV |
530 | if (cd) { |
531 | ret = cdrom_open(&cd->cdi, bdev, mode); | |
532 | if (ret) | |
533 | scsi_cd_put(cd); | |
534 | } | |
2a48fc0a | 535 | mutex_unlock(&sr_mutex); |
1da177e4 LT |
536 | return ret; |
537 | } | |
538 | ||
db2a144b | 539 | static void sr_block_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 540 | { |
40cc51be | 541 | struct scsi_cd *cd = scsi_cd(disk); |
2a48fc0a | 542 | mutex_lock(&sr_mutex); |
40cc51be | 543 | cdrom_release(&cd->cdi, mode); |
1da177e4 | 544 | scsi_cd_put(cd); |
2a48fc0a | 545 | mutex_unlock(&sr_mutex); |
1da177e4 LT |
546 | } |
547 | ||
40cc51be | 548 | static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
1da177e4 LT |
549 | unsigned long arg) |
550 | { | |
40cc51be | 551 | struct scsi_cd *cd = scsi_cd(bdev->bd_disk); |
1da177e4 | 552 | struct scsi_device *sdev = cd->device; |
6a2900b6 CH |
553 | void __user *argp = (void __user *)arg; |
554 | int ret; | |
1da177e4 | 555 | |
2a48fc0a | 556 | mutex_lock(&sr_mutex); |
8a6cfeb6 | 557 | |
6a2900b6 CH |
558 | /* |
559 | * Send SCSI addressing ioctls directly to mid level, send other | |
560 | * ioctls to cdrom/block level. | |
561 | */ | |
562 | switch (cmd) { | |
563 | case SCSI_IOCTL_GET_IDLUN: | |
564 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
8a6cfeb6 AB |
565 | ret = scsi_ioctl(sdev, cmd, argp); |
566 | goto out; | |
1da177e4 | 567 | } |
6a2900b6 | 568 | |
40cc51be | 569 | ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); |
6397256b | 570 | if (ret != -ENOSYS) |
8a6cfeb6 | 571 | goto out; |
6a2900b6 CH |
572 | |
573 | /* | |
574 | * ENODEV means that we didn't recognise the ioctl, or that we | |
575 | * cannot execute it in the current device state. In either | |
576 | * case fall through to scsi_ioctl, which will return ENDOEV again | |
577 | * if it doesn't recognise the ioctl | |
578 | */ | |
83ff6fe8 | 579 | ret = scsi_nonblockable_ioctl(sdev, cmd, argp, |
fd4ce1ac | 580 | (mode & FMODE_NDELAY) != 0); |
6a2900b6 | 581 | if (ret != -ENODEV) |
8a6cfeb6 AB |
582 | goto out; |
583 | ret = scsi_ioctl(sdev, cmd, argp); | |
584 | ||
585 | out: | |
2a48fc0a | 586 | mutex_unlock(&sr_mutex); |
8a6cfeb6 | 587 | return ret; |
1da177e4 LT |
588 | } |
589 | ||
93aae17a TH |
590 | static unsigned int sr_block_check_events(struct gendisk *disk, |
591 | unsigned int clearing) | |
1da177e4 LT |
592 | { |
593 | struct scsi_cd *cd = scsi_cd(disk); | |
6c7f1e2f | 594 | |
6627b38f AL |
595 | if (atomic_read(&cd->device->disk_events_disable_depth)) |
596 | return 0; | |
6c7f1e2f | 597 | |
6627b38f | 598 | return cdrom_check_events(&cd->cdi, clearing); |
93aae17a TH |
599 | } |
600 | ||
601 | static int sr_block_revalidate_disk(struct gendisk *disk) | |
602 | { | |
603 | struct scsi_cd *cd = scsi_cd(disk); | |
604 | struct scsi_sense_hdr sshdr; | |
605 | ||
606 | /* if the unit is not ready, nothing more to do */ | |
607 | if (scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) | |
6c7f1e2f | 608 | goto out; |
93aae17a TH |
609 | |
610 | sr_cd_check(&cd->cdi); | |
611 | get_sectorsize(cd); | |
6c7f1e2f | 612 | out: |
93aae17a | 613 | return 0; |
1da177e4 LT |
614 | } |
615 | ||
83d5cde4 | 616 | static const struct block_device_operations sr_bdops = |
1da177e4 LT |
617 | { |
618 | .owner = THIS_MODULE, | |
40cc51be AV |
619 | .open = sr_block_open, |
620 | .release = sr_block_release, | |
8a6cfeb6 | 621 | .ioctl = sr_block_ioctl, |
93aae17a TH |
622 | .check_events = sr_block_check_events, |
623 | .revalidate_disk = sr_block_revalidate_disk, | |
1da177e4 LT |
624 | /* |
625 | * No compat_ioctl for now because sr_block_ioctl never | |
25985edc | 626 | * seems to pass arbitrary ioctls down to host drivers. |
1da177e4 LT |
627 | */ |
628 | }; | |
629 | ||
630 | static int sr_open(struct cdrom_device_info *cdi, int purpose) | |
631 | { | |
632 | struct scsi_cd *cd = cdi->handle; | |
633 | struct scsi_device *sdev = cd->device; | |
634 | int retval; | |
635 | ||
636 | /* | |
637 | * If the device is in error recovery, wait until it is done. | |
638 | * If the device is offline, then disallow any access to it. | |
639 | */ | |
640 | retval = -ENXIO; | |
641 | if (!scsi_block_when_processing_errors(sdev)) | |
642 | goto error_out; | |
643 | ||
1da177e4 LT |
644 | return 0; |
645 | ||
646 | error_out: | |
647 | return retval; | |
648 | } | |
649 | ||
650 | static void sr_release(struct cdrom_device_info *cdi) | |
651 | { | |
652 | struct scsi_cd *cd = cdi->handle; | |
653 | ||
654 | if (cd->device->sector_size > 2048) | |
655 | sr_set_blocklength(cd, 2048); | |
656 | ||
657 | } | |
658 | ||
659 | static int sr_probe(struct device *dev) | |
660 | { | |
661 | struct scsi_device *sdev = to_scsi_device(dev); | |
662 | struct gendisk *disk; | |
663 | struct scsi_cd *cd; | |
664 | int minor, error; | |
665 | ||
666 | error = -ENODEV; | |
667 | if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) | |
668 | goto fail; | |
669 | ||
670 | error = -ENOMEM; | |
24669f75 | 671 | cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
1da177e4 LT |
672 | if (!cd) |
673 | goto fail; | |
1da177e4 LT |
674 | |
675 | kref_init(&cd->kref); | |
676 | ||
677 | disk = alloc_disk(1); | |
678 | if (!disk) | |
679 | goto fail_free; | |
680 | ||
681 | spin_lock(&sr_index_lock); | |
682 | minor = find_first_zero_bit(sr_index_bits, SR_DISKS); | |
683 | if (minor == SR_DISKS) { | |
684 | spin_unlock(&sr_index_lock); | |
685 | error = -EBUSY; | |
686 | goto fail_put; | |
687 | } | |
688 | __set_bit(minor, sr_index_bits); | |
689 | spin_unlock(&sr_index_lock); | |
690 | ||
691 | disk->major = SCSI_CDROM_MAJOR; | |
692 | disk->first_minor = minor; | |
693 | sprintf(disk->disk_name, "sr%d", minor); | |
694 | disk->fops = &sr_bdops; | |
d4dc210f | 695 | disk->flags = GENHD_FL_CD | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; |
93aae17a | 696 | disk->events = DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST; |
1da177e4 | 697 | |
242f9dcb JA |
698 | blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); |
699 | ||
1da177e4 LT |
700 | cd->device = sdev; |
701 | cd->disk = disk; | |
702 | cd->driver = &sr_template; | |
703 | cd->disk = disk; | |
704 | cd->capacity = 0x1fffff; | |
1da177e4 | 705 | cd->device->changed = 1; /* force recheck CD type */ |
93aae17a | 706 | cd->media_present = 1; |
1da177e4 LT |
707 | cd->use = 1; |
708 | cd->readcd_known = 0; | |
709 | cd->readcd_cdda = 0; | |
710 | ||
711 | cd->cdi.ops = &sr_dops; | |
712 | cd->cdi.handle = cd; | |
713 | cd->cdi.mask = 0; | |
714 | cd->cdi.capacity = 1; | |
715 | sprintf(cd->cdi.name, "sr%d", minor); | |
716 | ||
717 | sdev->sector_size = 2048; /* A guess, just in case */ | |
718 | ||
719 | /* FIXME: need to handle a get_capabilities failure properly ?? */ | |
720 | get_capabilities(cd); | |
7f9a6bc4 | 721 | blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); |
1da177e4 LT |
722 | sr_vendor_init(cd); |
723 | ||
1da177e4 LT |
724 | disk->driverfs_dev = &sdev->sdev_gendev; |
725 | set_capacity(disk, cd->capacity); | |
726 | disk->private_data = &cd->driver; | |
727 | disk->queue = sdev->request_queue; | |
728 | cd->cdi.disk = disk; | |
729 | ||
730 | if (register_cdrom(&cd->cdi)) | |
731 | goto fail_put; | |
732 | ||
6627b38f AL |
733 | /* |
734 | * Initialize block layer runtime PM stuffs before the | |
735 | * periodic event checking request gets started in add_disk. | |
736 | */ | |
737 | blk_pm_runtime_init(sdev->request_queue, dev); | |
738 | ||
1da177e4 LT |
739 | dev_set_drvdata(dev, cd); |
740 | disk->flags |= GENHD_FL_REMOVABLE; | |
741 | add_disk(disk); | |
742 | ||
9ccfc756 JB |
743 | sdev_printk(KERN_DEBUG, sdev, |
744 | "Attached scsi CD-ROM %s\n", cd->cdi.name); | |
6c7f1e2f AL |
745 | scsi_autopm_put_device(cd->device); |
746 | ||
1da177e4 LT |
747 | return 0; |
748 | ||
749 | fail_put: | |
750 | put_disk(disk); | |
751 | fail_free: | |
752 | kfree(cd); | |
753 | fail: | |
754 | return error; | |
755 | } | |
756 | ||
757 | ||
758 | static void get_sectorsize(struct scsi_cd *cd) | |
759 | { | |
760 | unsigned char cmd[10]; | |
62858dac | 761 | unsigned char buffer[8]; |
1da177e4 LT |
762 | int the_result, retries = 3; |
763 | int sector_size; | |
165125e1 | 764 | struct request_queue *queue; |
1da177e4 | 765 | |
1da177e4 LT |
766 | do { |
767 | cmd[0] = READ_CAPACITY; | |
768 | memset((void *) &cmd[1], 0, 9); | |
62858dac | 769 | memset(buffer, 0, sizeof(buffer)); |
1da177e4 LT |
770 | |
771 | /* Do the command and wait.. */ | |
820732b5 | 772 | the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
62858dac | 773 | buffer, sizeof(buffer), NULL, |
f4f4e47e | 774 | SR_TIMEOUT, MAX_RETRIES, NULL); |
1da177e4 | 775 | |
1da177e4 LT |
776 | retries--; |
777 | ||
778 | } while (the_result && retries); | |
779 | ||
780 | ||
1da177e4 LT |
781 | if (the_result) { |
782 | cd->capacity = 0x1fffff; | |
783 | sector_size = 2048; /* A guess, just in case */ | |
1da177e4 | 784 | } else { |
5915136d TH |
785 | long last_written; |
786 | ||
787 | cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | | |
788 | (buffer[2] << 8) | buffer[3]); | |
789 | /* | |
790 | * READ_CAPACITY doesn't return the correct size on | |
791 | * certain UDF media. If last_written is larger, use | |
792 | * it instead. | |
793 | * | |
794 | * http://bugzilla.kernel.org/show_bug.cgi?id=9668 | |
795 | */ | |
796 | if (!cdrom_get_last_written(&cd->cdi, &last_written)) | |
797 | cd->capacity = max_t(long, cd->capacity, last_written); | |
798 | ||
1da177e4 LT |
799 | sector_size = (buffer[4] << 24) | |
800 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
801 | switch (sector_size) { | |
802 | /* | |
803 | * HP 4020i CD-Recorder reports 2340 byte sectors | |
804 | * Philips CD-Writers report 2352 byte sectors | |
805 | * | |
806 | * Use 2k sectors for them.. | |
807 | */ | |
808 | case 0: | |
809 | case 2340: | |
810 | case 2352: | |
811 | sector_size = 2048; | |
812 | /* fall through */ | |
813 | case 2048: | |
814 | cd->capacity *= 4; | |
815 | /* fall through */ | |
816 | case 512: | |
817 | break; | |
818 | default: | |
819 | printk("%s: unsupported sector size %d.\n", | |
820 | cd->cdi.name, sector_size); | |
821 | cd->capacity = 0; | |
1da177e4 LT |
822 | } |
823 | ||
824 | cd->device->sector_size = sector_size; | |
825 | ||
826 | /* | |
827 | * Add this so that we have the ability to correctly gauge | |
828 | * what the device is capable of. | |
829 | */ | |
1da177e4 LT |
830 | set_capacity(cd->disk, cd->capacity); |
831 | } | |
832 | ||
833 | queue = cd->device->request_queue; | |
e1defc4f | 834 | blk_queue_logical_block_size(queue, sector_size); |
1da177e4 | 835 | |
62858dac | 836 | return; |
1da177e4 LT |
837 | } |
838 | ||
839 | static void get_capabilities(struct scsi_cd *cd) | |
840 | { | |
841 | unsigned char *buffer; | |
842 | struct scsi_mode_data data; | |
820732b5 | 843 | struct scsi_sense_hdr sshdr; |
38582a62 | 844 | int rc, n; |
1da177e4 | 845 | |
0ad78200 | 846 | static const char *loadmech[] = |
1da177e4 LT |
847 | { |
848 | "caddy", | |
849 | "tray", | |
850 | "pop-up", | |
851 | "", | |
852 | "changer", | |
853 | "cartridge changer", | |
854 | "", | |
855 | "" | |
856 | }; | |
857 | ||
1da177e4 LT |
858 | |
859 | /* allocate transfer buffer */ | |
860 | buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); | |
861 | if (!buffer) { | |
862 | printk(KERN_ERR "sr: out of memory.\n"); | |
1da177e4 LT |
863 | return; |
864 | } | |
865 | ||
38582a62 | 866 | /* eat unit attentions */ |
9f8a2c23 | 867 | scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); |
1da177e4 LT |
868 | |
869 | /* ask for mode page 0x2a */ | |
870 | rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, | |
1cf72699 | 871 | SR_TIMEOUT, 3, &data, NULL); |
1da177e4 LT |
872 | |
873 | if (!scsi_status_is_good(rc)) { | |
874 | /* failed, drive doesn't have capabilities mode page */ | |
875 | cd->cdi.speed = 1; | |
876 | cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | | |
bcc1e382 CE |
877 | CDC_DVD | CDC_DVD_RAM | |
878 | CDC_SELECT_DISC | CDC_SELECT_SPEED | | |
879 | CDC_MRW | CDC_MRW_W | CDC_RAM); | |
1da177e4 LT |
880 | kfree(buffer); |
881 | printk("%s: scsi-1 drive\n", cd->cdi.name); | |
882 | return; | |
883 | } | |
884 | ||
885 | n = data.header_length + data.block_descriptor_length; | |
886 | cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; | |
887 | cd->readcd_known = 1; | |
888 | cd->readcd_cdda = buffer[n + 5] & 0x01; | |
889 | /* print some capability bits */ | |
890 | printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, | |
891 | ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, | |
892 | cd->cdi.speed, | |
893 | buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ | |
894 | buffer[n + 3] & 0x20 ? "dvd-ram " : "", | |
895 | buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ | |
896 | buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ | |
897 | buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ | |
898 | loadmech[buffer[n + 6] >> 5]); | |
899 | if ((buffer[n + 6] >> 5) == 0) | |
900 | /* caddy drives can't close tray... */ | |
901 | cd->cdi.mask |= CDC_CLOSE_TRAY; | |
902 | if ((buffer[n + 2] & 0x8) == 0) | |
903 | /* not a DVD drive */ | |
904 | cd->cdi.mask |= CDC_DVD; | |
905 | if ((buffer[n + 3] & 0x20) == 0) | |
906 | /* can't write DVD-RAM media */ | |
907 | cd->cdi.mask |= CDC_DVD_RAM; | |
908 | if ((buffer[n + 3] & 0x10) == 0) | |
909 | /* can't write DVD-R media */ | |
910 | cd->cdi.mask |= CDC_DVD_R; | |
911 | if ((buffer[n + 3] & 0x2) == 0) | |
912 | /* can't write CD-RW media */ | |
913 | cd->cdi.mask |= CDC_CD_RW; | |
914 | if ((buffer[n + 3] & 0x1) == 0) | |
915 | /* can't write CD-R media */ | |
916 | cd->cdi.mask |= CDC_CD_R; | |
917 | if ((buffer[n + 6] & 0x8) == 0) | |
918 | /* can't eject */ | |
919 | cd->cdi.mask |= CDC_OPEN_TRAY; | |
920 | ||
921 | if ((buffer[n + 6] >> 5) == mechtype_individual_changer || | |
922 | (buffer[n + 6] >> 5) == mechtype_cartridge_changer) | |
923 | cd->cdi.capacity = | |
924 | cdrom_number_of_slots(&cd->cdi); | |
925 | if (cd->cdi.capacity <= 1) | |
926 | /* not a changer */ | |
927 | cd->cdi.mask |= CDC_SELECT_DISC; | |
928 | /*else I don't think it can close its tray | |
929 | cd->cdi.mask |= CDC_CLOSE_TRAY; */ | |
930 | ||
931 | /* | |
932 | * if DVD-RAM, MRW-W or CD-RW, we are randomly writable | |
933 | */ | |
934 | if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != | |
935 | (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { | |
936 | cd->device->writeable = 1; | |
937 | } | |
938 | ||
1da177e4 LT |
939 | kfree(buffer); |
940 | } | |
941 | ||
942 | /* | |
943 | * sr_packet() is the entry point for the generic commands generated | |
944 | * by the Uniform CD-ROM layer. | |
945 | */ | |
946 | static int sr_packet(struct cdrom_device_info *cdi, | |
947 | struct packet_command *cgc) | |
948 | { | |
8e04d805 HG |
949 | struct scsi_cd *cd = cdi->handle; |
950 | struct scsi_device *sdev = cd->device; | |
951 | ||
952 | if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) | |
953 | return -EDRIVE_CANT_DO_THIS; | |
954 | ||
1da177e4 LT |
955 | if (cgc->timeout <= 0) |
956 | cgc->timeout = IOCTL_TIMEOUT; | |
957 | ||
8e04d805 | 958 | sr_do_ioctl(cd, cgc); |
1da177e4 LT |
959 | |
960 | return cgc->stat; | |
961 | } | |
962 | ||
963 | /** | |
964 | * sr_kref_release - Called to free the scsi_cd structure | |
965 | * @kref: pointer to embedded kref | |
966 | * | |
0b950672 | 967 | * sr_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
968 | * called on last put, you should always use the scsi_cd_get() |
969 | * scsi_cd_put() helpers which manipulate the semaphore directly | |
970 | * and never do a direct kref_put(). | |
971 | **/ | |
972 | static void sr_kref_release(struct kref *kref) | |
973 | { | |
974 | struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); | |
975 | struct gendisk *disk = cd->disk; | |
976 | ||
977 | spin_lock(&sr_index_lock); | |
f331c029 | 978 | clear_bit(MINOR(disk_devt(disk)), sr_index_bits); |
1da177e4 LT |
979 | spin_unlock(&sr_index_lock); |
980 | ||
981 | unregister_cdrom(&cd->cdi); | |
982 | ||
983 | disk->private_data = NULL; | |
984 | ||
985 | put_disk(disk); | |
986 | ||
987 | kfree(cd); | |
988 | } | |
989 | ||
990 | static int sr_remove(struct device *dev) | |
991 | { | |
992 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
993 | ||
6c7f1e2f AL |
994 | scsi_autopm_get_device(cd->device); |
995 | ||
b391277a | 996 | blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn); |
1da177e4 LT |
997 | del_gendisk(cd->disk); |
998 | ||
0b950672 | 999 | mutex_lock(&sr_ref_mutex); |
1da177e4 | 1000 | kref_put(&cd->kref, sr_kref_release); |
0b950672 | 1001 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
1002 | |
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | static int __init init_sr(void) | |
1007 | { | |
1008 | int rc; | |
1009 | ||
1010 | rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1011 | if (rc) | |
1012 | return rc; | |
da3962fe AM |
1013 | rc = scsi_register_driver(&sr_template.gendrv); |
1014 | if (rc) | |
1015 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1016 | ||
1017 | return rc; | |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | static void __exit exit_sr(void) | |
1021 | { | |
1022 | scsi_unregister_driver(&sr_template.gendrv); | |
1023 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
1024 | } | |
1025 | ||
1026 | module_init(init_sr); | |
1027 | module_exit(exit_sr); | |
1028 | MODULE_LICENSE("GPL"); |