xref: /openbmc/linux/drivers/scsi/sr_ioctl.c (revision 6c0cf602)
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/mm.h>
4 #include <linux/fs.h>
5 #include <linux/errno.h>
6 #include <linux/string.h>
7 #include <linux/blkdev.h>
8 #include <linux/module.h>
9 #include <linux/blkpg.h>
10 #include <linux/cdrom.h>
11 #include <linux/delay.h>
12 #include <linux/slab.h>
13 #include <asm/io.h>
14 #include <linux/uaccess.h>
15 
16 #include <scsi/scsi.h>
17 #include <scsi/scsi_dbg.h>
18 #include <scsi/scsi_device.h>
19 #include <scsi/scsi_eh.h>
20 #include <scsi/scsi_host.h>
21 #include <scsi/scsi_ioctl.h>
22 #include <scsi/scsi_cmnd.h>
23 
24 #include "sr.h"
25 
26 #if 0
27 #define DEBUG
28 #endif
29 
30 /* The sr_is_xa() seems to trigger firmware bugs with some drives :-(
31  * It is off by default and can be turned on with this module parameter */
32 static int xa_test = 0;
33 
34 module_param(xa_test, int, S_IRUGO | S_IWUSR);
35 
sr_read_tochdr(struct cdrom_device_info * cdi,struct cdrom_tochdr * tochdr)36 static int sr_read_tochdr(struct cdrom_device_info *cdi,
37 		struct cdrom_tochdr *tochdr)
38 {
39 	struct scsi_cd *cd = cdi->handle;
40 	struct packet_command cgc;
41 	int result;
42 	unsigned char *buffer;
43 
44 	buffer = kzalloc(32, GFP_KERNEL);
45 	if (!buffer)
46 		return -ENOMEM;
47 
48 	memset(&cgc, 0, sizeof(struct packet_command));
49 	cgc.timeout = IOCTL_TIMEOUT;
50 	cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
51 	cgc.cmd[8] = 12;		/* LSB of length */
52 	cgc.buffer = buffer;
53 	cgc.buflen = 12;
54 	cgc.quiet = 1;
55 	cgc.data_direction = DMA_FROM_DEVICE;
56 
57 	result = sr_do_ioctl(cd, &cgc);
58 	if (result)
59 		goto err;
60 
61 	tochdr->cdth_trk0 = buffer[2];
62 	tochdr->cdth_trk1 = buffer[3];
63 
64 err:
65 	kfree(buffer);
66 	return result;
67 }
68 
sr_read_tocentry(struct cdrom_device_info * cdi,struct cdrom_tocentry * tocentry)69 static int sr_read_tocentry(struct cdrom_device_info *cdi,
70 		struct cdrom_tocentry *tocentry)
71 {
72 	struct scsi_cd *cd = cdi->handle;
73 	struct packet_command cgc;
74 	int result;
75 	unsigned char *buffer;
76 
77 	buffer = kzalloc(32, GFP_KERNEL);
78 	if (!buffer)
79 		return -ENOMEM;
80 
81 	memset(&cgc, 0, sizeof(struct packet_command));
82 	cgc.timeout = IOCTL_TIMEOUT;
83 	cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
84 	cgc.cmd[1] |= (tocentry->cdte_format == CDROM_MSF) ? 0x02 : 0;
85 	cgc.cmd[6] = tocentry->cdte_track;
86 	cgc.cmd[8] = 12;		/* LSB of length */
87 	cgc.buffer = buffer;
88 	cgc.buflen = 12;
89 	cgc.data_direction = DMA_FROM_DEVICE;
90 
91 	result = sr_do_ioctl(cd, &cgc);
92 	if (result)
93 		goto err;
94 
95 	tocentry->cdte_ctrl = buffer[5] & 0xf;
96 	tocentry->cdte_adr = buffer[5] >> 4;
97 	tocentry->cdte_datamode = (tocentry->cdte_ctrl & 0x04) ? 1 : 0;
98 	if (tocentry->cdte_format == CDROM_MSF) {
99 		tocentry->cdte_addr.msf.minute = buffer[9];
100 		tocentry->cdte_addr.msf.second = buffer[10];
101 		tocentry->cdte_addr.msf.frame = buffer[11];
102 	} else
103 		tocentry->cdte_addr.lba = (((((buffer[8] << 8) + buffer[9]) << 8)
104 			+ buffer[10]) << 8) + buffer[11];
105 
106 err:
107 	kfree(buffer);
108 	return result;
109 }
110 
111 #define IOCTL_RETRIES 3
112 
113 /* ATAPI drives don't have a SCMD_PLAYAUDIO_TI command.  When these drives
114    are emulating a SCSI device via the idescsi module, they need to have
115    CDROMPLAYTRKIND commands translated into CDROMPLAYMSF commands for them */
116 
sr_fake_playtrkind(struct cdrom_device_info * cdi,struct cdrom_ti * ti)117 static int sr_fake_playtrkind(struct cdrom_device_info *cdi, struct cdrom_ti *ti)
118 {
119 	struct cdrom_tocentry trk0_te, trk1_te;
120 	struct cdrom_tochdr tochdr;
121 	struct packet_command cgc;
122 	int ntracks, ret;
123 
124 	ret = sr_read_tochdr(cdi, &tochdr);
125 	if (ret)
126 		return ret;
127 
128 	ntracks = tochdr.cdth_trk1 - tochdr.cdth_trk0 + 1;
129 
130 	if (ti->cdti_trk1 == ntracks)
131 		ti->cdti_trk1 = CDROM_LEADOUT;
132 	else if (ti->cdti_trk1 != CDROM_LEADOUT)
133 		ti->cdti_trk1 ++;
134 
135 	trk0_te.cdte_track = ti->cdti_trk0;
136 	trk0_te.cdte_format = CDROM_MSF;
137 	trk1_te.cdte_track = ti->cdti_trk1;
138 	trk1_te.cdte_format = CDROM_MSF;
139 
140 	ret = sr_read_tocentry(cdi, &trk0_te);
141 	if (ret)
142 		return ret;
143 	ret = sr_read_tocentry(cdi, &trk1_te);
144 	if (ret)
145 		return ret;
146 
147 	memset(&cgc, 0, sizeof(struct packet_command));
148 	cgc.cmd[0] = GPCMD_PLAY_AUDIO_MSF;
149 	cgc.cmd[3] = trk0_te.cdte_addr.msf.minute;
150 	cgc.cmd[4] = trk0_te.cdte_addr.msf.second;
151 	cgc.cmd[5] = trk0_te.cdte_addr.msf.frame;
152 	cgc.cmd[6] = trk1_te.cdte_addr.msf.minute;
153 	cgc.cmd[7] = trk1_te.cdte_addr.msf.second;
154 	cgc.cmd[8] = trk1_te.cdte_addr.msf.frame;
155 	cgc.data_direction = DMA_NONE;
156 	cgc.timeout = IOCTL_TIMEOUT;
157 	return sr_do_ioctl(cdi->handle, &cgc);
158 }
159 
sr_play_trkind(struct cdrom_device_info * cdi,struct cdrom_ti * ti)160 static int sr_play_trkind(struct cdrom_device_info *cdi,
161 		struct cdrom_ti *ti)
162 
163 {
164 	struct scsi_cd *cd = cdi->handle;
165 	struct packet_command cgc;
166 	int result;
167 
168 	memset(&cgc, 0, sizeof(struct packet_command));
169 	cgc.timeout = IOCTL_TIMEOUT;
170 	cgc.cmd[0] = GPCMD_PLAYAUDIO_TI;
171 	cgc.cmd[4] = ti->cdti_trk0;
172 	cgc.cmd[5] = ti->cdti_ind0;
173 	cgc.cmd[7] = ti->cdti_trk1;
174 	cgc.cmd[8] = ti->cdti_ind1;
175 	cgc.data_direction = DMA_NONE;
176 
177 	result = sr_do_ioctl(cd, &cgc);
178 	if (result == -EDRIVE_CANT_DO_THIS)
179 		result = sr_fake_playtrkind(cdi, ti);
180 
181 	return result;
182 }
183 
184 /* We do our own retries because we want to know what the specific
185    error code is.  Normally the UNIT_ATTENTION code will automatically
186    clear after one error */
187 
sr_do_ioctl(Scsi_CD * cd,struct packet_command * cgc)188 int sr_do_ioctl(Scsi_CD *cd, struct packet_command *cgc)
189 {
190 	struct scsi_device *SDev;
191 	struct scsi_sense_hdr local_sshdr, *sshdr;
192 	int result, err = 0, retries = 0;
193 	const struct scsi_exec_args exec_args = {
194 		.sshdr = cgc->sshdr ? : &local_sshdr,
195 	};
196 
197 	SDev = cd->device;
198 
199 	sshdr = exec_args.sshdr;
200 
201       retry:
202 	if (!scsi_block_when_processing_errors(SDev)) {
203 		err = -ENODEV;
204 		goto out;
205 	}
206 
207 	result = scsi_execute_cmd(SDev, cgc->cmd,
208 				  cgc->data_direction == DMA_TO_DEVICE ?
209 				  REQ_OP_DRV_OUT : REQ_OP_DRV_IN, cgc->buffer,
210 				  cgc->buflen, cgc->timeout, IOCTL_RETRIES,
211 				  &exec_args);
212 	/* Minimal error checking.  Ignore cases we know about, and report the rest. */
213 	if (result < 0) {
214 		err = result;
215 		goto out;
216 	}
217 	if (scsi_status_is_check_condition(result)) {
218 		switch (sshdr->sense_key) {
219 		case UNIT_ATTENTION:
220 			SDev->changed = 1;
221 			if (!cgc->quiet)
222 				sr_printk(KERN_INFO, cd,
223 					  "disc change detected.\n");
224 			if (retries++ < 10)
225 				goto retry;
226 			err = -ENOMEDIUM;
227 			break;
228 		case NOT_READY:	/* This happens if there is no disc in drive */
229 			if (sshdr->asc == 0x04 &&
230 			    sshdr->ascq == 0x01) {
231 				/* sense: Logical unit is in process of becoming ready */
232 				if (!cgc->quiet)
233 					sr_printk(KERN_INFO, cd,
234 						  "CDROM not ready yet.\n");
235 				if (retries++ < 10) {
236 					/* sleep 2 sec and try again */
237 					ssleep(2);
238 					goto retry;
239 				} else {
240 					/* 20 secs are enough? */
241 					err = -ENOMEDIUM;
242 					break;
243 				}
244 			}
245 			if (!cgc->quiet)
246 				sr_printk(KERN_INFO, cd,
247 					  "CDROM not ready.  Make sure there "
248 					  "is a disc in the drive.\n");
249 			err = -ENOMEDIUM;
250 			break;
251 		case ILLEGAL_REQUEST:
252 			err = -EIO;
253 			if (sshdr->asc == 0x20 &&
254 			    sshdr->ascq == 0x00)
255 				/* sense: Invalid command operation code */
256 				err = -EDRIVE_CANT_DO_THIS;
257 			break;
258 		default:
259 			err = -EIO;
260 		}
261 	}
262 
263 	/* Wake up a process waiting for device */
264       out:
265 	cgc->stat = err;
266 	return err;
267 }
268 
269 /* ---------------------------------------------------------------------- */
270 /* interface to cdrom.c                                                   */
271 
sr_tray_move(struct cdrom_device_info * cdi,int pos)272 int sr_tray_move(struct cdrom_device_info *cdi, int pos)
273 {
274 	Scsi_CD *cd = cdi->handle;
275 	struct packet_command cgc;
276 
277 	memset(&cgc, 0, sizeof(struct packet_command));
278 	cgc.cmd[0] = GPCMD_START_STOP_UNIT;
279 	cgc.cmd[4] = (pos == 0) ? 0x03 /* close */ : 0x02 /* eject */ ;
280 	cgc.data_direction = DMA_NONE;
281 	cgc.timeout = IOCTL_TIMEOUT;
282 	return sr_do_ioctl(cd, &cgc);
283 }
284 
sr_lock_door(struct cdrom_device_info * cdi,int lock)285 int sr_lock_door(struct cdrom_device_info *cdi, int lock)
286 {
287 	Scsi_CD *cd = cdi->handle;
288 
289 	return scsi_set_medium_removal(cd->device, lock ?
290 		       SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW);
291 }
292 
sr_drive_status(struct cdrom_device_info * cdi,int slot)293 int sr_drive_status(struct cdrom_device_info *cdi, int slot)
294 {
295 	struct scsi_cd *cd = cdi->handle;
296 	struct scsi_sense_hdr sshdr;
297 	struct media_event_desc med;
298 
299 	if (CDSL_CURRENT != slot) {
300 		/* we have no changer support */
301 		return -EINVAL;
302 	}
303 	if (!scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
304 		return CDS_DISC_OK;
305 
306 	/* SK/ASC/ASCQ of 2/4/1 means "unit is becoming ready" */
307 	if (scsi_sense_valid(&sshdr) && sshdr.sense_key == NOT_READY
308 			&& sshdr.asc == 0x04 && sshdr.ascq == 0x01)
309 		return CDS_DRIVE_NOT_READY;
310 
311 	if (!cdrom_get_media_event(cdi, &med)) {
312 		if (med.media_present)
313 			return CDS_DISC_OK;
314 		else if (med.door_open)
315 			return CDS_TRAY_OPEN;
316 		else
317 			return CDS_NO_DISC;
318 	}
319 
320 	/*
321 	 * SK/ASC/ASCQ of 2/4/2 means "initialization required"
322 	 * Using CD_TRAY_OPEN results in an START_STOP_UNIT to close
323 	 * the tray, which resolves the initialization requirement.
324 	 */
325 	if (scsi_sense_valid(&sshdr) && sshdr.sense_key == NOT_READY
326 			&& sshdr.asc == 0x04 && sshdr.ascq == 0x02)
327 		return CDS_TRAY_OPEN;
328 
329 	/*
330 	 * 0x04 is format in progress .. but there must be a disc present!
331 	 */
332 	if (sshdr.sense_key == NOT_READY && sshdr.asc == 0x04)
333 		return CDS_DISC_OK;
334 
335 	/*
336 	 * If not using Mt Fuji extended media tray reports,
337 	 * just return TRAY_OPEN since ATAPI doesn't provide
338 	 * any other way to detect this...
339 	 */
340 	if (scsi_sense_valid(&sshdr) &&
341 	    /* 0x3a is medium not present */
342 	    sshdr.asc == 0x3a)
343 		return CDS_NO_DISC;
344 	else
345 		return CDS_TRAY_OPEN;
346 
347 	return CDS_DRIVE_NOT_READY;
348 }
349 
sr_disk_status(struct cdrom_device_info * cdi)350 int sr_disk_status(struct cdrom_device_info *cdi)
351 {
352 	Scsi_CD *cd = cdi->handle;
353 	struct cdrom_tochdr toc_h;
354 	struct cdrom_tocentry toc_e;
355 	int i, rc, have_datatracks = 0;
356 
357 	/* look for data tracks */
358 	rc = sr_read_tochdr(cdi, &toc_h);
359 	if (rc)
360 		return (rc == -ENOMEDIUM) ? CDS_NO_DISC : CDS_NO_INFO;
361 
362 	for (i = toc_h.cdth_trk0; i <= toc_h.cdth_trk1; i++) {
363 		toc_e.cdte_track = i;
364 		toc_e.cdte_format = CDROM_LBA;
365 		if (sr_read_tocentry(cdi, &toc_e))
366 			return CDS_NO_INFO;
367 		if (toc_e.cdte_ctrl & CDROM_DATA_TRACK) {
368 			have_datatracks = 1;
369 			break;
370 		}
371 	}
372 	if (!have_datatracks)
373 		return CDS_AUDIO;
374 
375 	if (cd->xa_flag)
376 		return CDS_XA_2_1;
377 	else
378 		return CDS_DATA_1;
379 }
380 
sr_get_last_session(struct cdrom_device_info * cdi,struct cdrom_multisession * ms_info)381 int sr_get_last_session(struct cdrom_device_info *cdi,
382 			struct cdrom_multisession *ms_info)
383 {
384 	Scsi_CD *cd = cdi->handle;
385 
386 	ms_info->addr.lba = cd->ms_offset;
387 	ms_info->xa_flag = cd->xa_flag || cd->ms_offset > 0;
388 
389 	return 0;
390 }
391 
sr_get_mcn(struct cdrom_device_info * cdi,struct cdrom_mcn * mcn)392 int sr_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
393 {
394 	Scsi_CD *cd = cdi->handle;
395 	struct packet_command cgc;
396 	char *buffer = kzalloc(32, GFP_KERNEL);
397 	int result;
398 
399 	if (!buffer)
400 		return -ENOMEM;
401 
402 	memset(&cgc, 0, sizeof(struct packet_command));
403 	cgc.cmd[0] = GPCMD_READ_SUBCHANNEL;
404 	cgc.cmd[2] = 0x40;	/* I do want the subchannel info */
405 	cgc.cmd[3] = 0x02;	/* Give me medium catalog number info */
406 	cgc.cmd[8] = 24;
407 	cgc.buffer = buffer;
408 	cgc.buflen = 24;
409 	cgc.data_direction = DMA_FROM_DEVICE;
410 	cgc.timeout = IOCTL_TIMEOUT;
411 	result = sr_do_ioctl(cd, &cgc);
412 	if (result)
413 		goto err;
414 
415 	memcpy(mcn->medium_catalog_number, buffer + 9, 13);
416 	mcn->medium_catalog_number[13] = 0;
417 
418 err:
419 	kfree(buffer);
420 	return result;
421 }
422 
sr_reset(struct cdrom_device_info * cdi)423 int sr_reset(struct cdrom_device_info *cdi)
424 {
425 	return 0;
426 }
427 
sr_select_speed(struct cdrom_device_info * cdi,unsigned long speed)428 int sr_select_speed(struct cdrom_device_info *cdi, unsigned long speed)
429 {
430 	Scsi_CD *cd = cdi->handle;
431 	struct packet_command cgc;
432 
433 	/* avoid exceeding the max speed or overflowing integer bounds */
434 	speed = clamp(speed, 0, 0xffff / 177);
435 
436 	if (speed == 0)
437 		speed = 0xffff;	/* set to max */
438 	else
439 		speed *= 177;	/* Nx to kbyte/s */
440 
441 	memset(&cgc, 0, sizeof(struct packet_command));
442 	cgc.cmd[0] = GPCMD_SET_SPEED;	/* SET CD SPEED */
443 	cgc.cmd[2] = (speed >> 8) & 0xff;	/* MSB for speed (in kbytes/sec) */
444 	cgc.cmd[3] = speed & 0xff;	/* LSB */
445 	cgc.data_direction = DMA_NONE;
446 	cgc.timeout = IOCTL_TIMEOUT;
447 
448 	if (sr_do_ioctl(cd, &cgc))
449 		return -EIO;
450 	return 0;
451 }
452 
453 /* ----------------------------------------------------------------------- */
454 /* this is called by the generic cdrom driver. arg is a _kernel_ pointer,  */
455 /* because the generic cdrom driver does the user access stuff for us.     */
456 /* only cdromreadtochdr and cdromreadtocentry are left - for use with the  */
457 /* sr_disk_status interface for the generic cdrom driver.                  */
458 
sr_audio_ioctl(struct cdrom_device_info * cdi,unsigned int cmd,void * arg)459 int sr_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
460 {
461 	switch (cmd) {
462 	case CDROMREADTOCHDR:
463 		return sr_read_tochdr(cdi, arg);
464 	case CDROMREADTOCENTRY:
465 		return sr_read_tocentry(cdi, arg);
466 	case CDROMPLAYTRKIND:
467 		return sr_play_trkind(cdi, arg);
468 	default:
469 		return -EINVAL;
470 	}
471 }
472 
473 /* -----------------------------------------------------------------------
474  * a function to read all sorts of funny cdrom sectors using the READ_CD
475  * scsi-3 mmc command
476  *
477  * lba:     linear block address
478  * format:  0 = data (anything)
479  *          1 = audio
480  *          2 = data (mode 1)
481  *          3 = data (mode 2)
482  *          4 = data (mode 2 form1)
483  *          5 = data (mode 2 form2)
484  * blksize: 2048 | 2336 | 2340 | 2352
485  */
486 
sr_read_cd(Scsi_CD * cd,unsigned char * dest,int lba,int format,int blksize)487 static int sr_read_cd(Scsi_CD *cd, unsigned char *dest, int lba, int format, int blksize)
488 {
489 	struct packet_command cgc;
490 
491 #ifdef DEBUG
492 	sr_printk(KERN_INFO, cd, "sr_read_cd lba=%d format=%d blksize=%d\n",
493 		  lba, format, blksize);
494 #endif
495 
496 	memset(&cgc, 0, sizeof(struct packet_command));
497 	cgc.cmd[0] = GPCMD_READ_CD;	/* READ_CD */
498 	cgc.cmd[1] = ((format & 7) << 2);
499 	cgc.cmd[2] = (unsigned char) (lba >> 24) & 0xff;
500 	cgc.cmd[3] = (unsigned char) (lba >> 16) & 0xff;
501 	cgc.cmd[4] = (unsigned char) (lba >> 8) & 0xff;
502 	cgc.cmd[5] = (unsigned char) lba & 0xff;
503 	cgc.cmd[8] = 1;
504 	switch (blksize) {
505 	case 2336:
506 		cgc.cmd[9] = 0x58;
507 		break;
508 	case 2340:
509 		cgc.cmd[9] = 0x78;
510 		break;
511 	case 2352:
512 		cgc.cmd[9] = 0xf8;
513 		break;
514 	default:
515 		cgc.cmd[9] = 0x10;
516 		break;
517 	}
518 	cgc.buffer = dest;
519 	cgc.buflen = blksize;
520 	cgc.data_direction = DMA_FROM_DEVICE;
521 	cgc.timeout = IOCTL_TIMEOUT;
522 	return sr_do_ioctl(cd, &cgc);
523 }
524 
525 /*
526  * read sectors with blocksizes other than 2048
527  */
528 
sr_read_sector(Scsi_CD * cd,int lba,int blksize,unsigned char * dest)529 static int sr_read_sector(Scsi_CD *cd, int lba, int blksize, unsigned char *dest)
530 {
531 	struct packet_command cgc;
532 	int rc;
533 
534 	/* we try the READ CD command first... */
535 	if (cd->readcd_known) {
536 		rc = sr_read_cd(cd, dest, lba, 0, blksize);
537 		if (-EDRIVE_CANT_DO_THIS != rc)
538 			return rc;
539 		cd->readcd_known = 0;
540 		sr_printk(KERN_INFO, cd,
541 			  "CDROM doesn't support READ CD (0xbe) command\n");
542 		/* fall & retry the other way */
543 	}
544 	/* ... if this fails, we switch the blocksize using MODE SELECT */
545 	if (blksize != cd->device->sector_size) {
546 		if (0 != (rc = sr_set_blocklength(cd, blksize)))
547 			return rc;
548 	}
549 #ifdef DEBUG
550 	sr_printk(KERN_INFO, cd, "sr_read_sector lba=%d blksize=%d\n",
551 		  lba, blksize);
552 #endif
553 
554 	memset(&cgc, 0, sizeof(struct packet_command));
555 	cgc.cmd[0] = GPCMD_READ_10;
556 	cgc.cmd[2] = (unsigned char) (lba >> 24) & 0xff;
557 	cgc.cmd[3] = (unsigned char) (lba >> 16) & 0xff;
558 	cgc.cmd[4] = (unsigned char) (lba >> 8) & 0xff;
559 	cgc.cmd[5] = (unsigned char) lba & 0xff;
560 	cgc.cmd[8] = 1;
561 	cgc.buffer = dest;
562 	cgc.buflen = blksize;
563 	cgc.data_direction = DMA_FROM_DEVICE;
564 	cgc.timeout = IOCTL_TIMEOUT;
565 	rc = sr_do_ioctl(cd, &cgc);
566 
567 	if (blksize != CD_FRAMESIZE)
568 		rc |= sr_set_blocklength(cd, CD_FRAMESIZE);
569 	return rc;
570 }
571 
572 /*
573  * read a sector in raw mode to check the sector format
574  * ret: 1 == mode2 (XA), 0 == mode1, <0 == error
575  */
576 
sr_is_xa(Scsi_CD * cd)577 int sr_is_xa(Scsi_CD *cd)
578 {
579 	unsigned char *raw_sector;
580 	int is_xa;
581 
582 	if (!xa_test)
583 		return 0;
584 
585 	raw_sector = kmalloc(2048, GFP_KERNEL);
586 	if (!raw_sector)
587 		return -ENOMEM;
588 	if (0 == sr_read_sector(cd, cd->ms_offset + 16,
589 				CD_FRAMESIZE_RAW1, raw_sector)) {
590 		is_xa = (raw_sector[3] == 0x02) ? 1 : 0;
591 	} else {
592 		/* read a raw sector failed for some reason. */
593 		is_xa = -1;
594 	}
595 	kfree(raw_sector);
596 #ifdef DEBUG
597 	sr_printk(KERN_INFO, cd, "sr_is_xa: %d\n", is_xa);
598 #endif
599 	return is_xa;
600 }
601