diff options
Diffstat (limited to 'drivers/scsi/sd.c')
| -rw-r--r-- | drivers/scsi/sd.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 4970ae4a62d6..e744ee40be69 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1383,18 +1383,22 @@ repeat: sd_read_protection_type(sdkp, buffer); } - /* Some devices return the total number of sectors, not the - * highest sector number. Make the necessary adjustment. */ - if (sdp->fix_capacity) { + /* Some devices are known to return the total number of blocks, + * not the highest block number. Some devices have versions + * which do this and others which do not. Some devices we might + * suspect of doing this but we don't know for certain. + * + * If we know the reported capacity is wrong, decrement it. If + * we can only guess, then assume the number of blocks is even + * (usually true but not always) and err on the side of lowering + * the capacity. + */ + if (sdp->fix_capacity || + (sdp->guess_capacity && (sdkp->capacity & 0x01))) { + sd_printk(KERN_INFO, sdkp, "Adjusting the sector count " + "from its reported value: %llu\n", + (unsigned long long) sdkp->capacity); --sdkp->capacity; - - /* Some devices have version which report the correct sizes - * and others which do not. We guess size according to a heuristic - * and err on the side of lowering the capacity. */ - } else { - if (sdp->guess_capacity) - if (sdkp->capacity & 0x01) /* odd sizes are odd */ - --sdkp->capacity; } got_data: |