diff options
| -rw-r--r-- | drivers/ide/ide-cd.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c index c8d0e8715997..e54da025a31c 100644 --- a/drivers/ide/ide-cd.c +++ b/drivers/ide/ide-cd.c @@ -1421,13 +1421,30 @@ static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity, req.cmd_flags |= REQ_QUIET; stat = ide_cd_queue_pc(drive, &req); - if (stat == 0) { - *capacity = 1 + be32_to_cpu(capbuf.lba); - *sectors_per_frame = - be32_to_cpu(capbuf.blocklen) >> SECTOR_BITS; + if (stat) + return stat; + + /* + * Sanity check the given block size + */ + switch (capbuf.blocklen) { + case __constant_cpu_to_be32(512): + case __constant_cpu_to_be32(1024): + case __constant_cpu_to_be32(2048): + case __constant_cpu_to_be32(4096): + break; + default: + printk(KERN_ERR "%s: weird block size %u\n", + drive->name, capbuf.blocklen); + printk(KERN_ERR "%s: default to 2kb block size\n", + drive->name); + capbuf.blocklen = __constant_cpu_to_be32(2048); + break; } - return stat; + *capacity = 1 + be32_to_cpu(capbuf.lba); + *sectors_per_frame = be32_to_cpu(capbuf.blocklen) >> SECTOR_BITS; + return 0; } static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag, |