drivers/scsi/sr_ioctl.c

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