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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-02-25 20:28:23 +0100
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-02-25 20:28:23 +0100
commitd3dd7107f4d843d0f01d0f77d49a7c5449130577 (patch)
tree5bd38dea522f07b5e6594116ac75f43ded33e69f /drivers/ide/ide-cd.c
parentf38344b0a0898d2a8c13581ee61007719e16e1d7 (diff)
ide-cd: document capacity hack
Just copy the comment from drivers/scsi/sr.c::sr_done() (from which the capacity hack has been originated). Cc: Borislav Petkov <petkovbb@gmail.com> Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/ide-cd.c')
-rw-r--r--drivers/ide/ide-cd.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 0bfeb0c79d6e..690475b834de 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -194,6 +194,14 @@ static void cdrom_analyze_sense_data(ide_drive_t *drive,
bio_sectors = max(bio_sectors(failed_command->bio), 4U);
sector &= ~(bio_sectors - 1);
+ /*
+ * The SCSI specification allows for the value
+ * returned by READ CAPACITY to be up to 75 2K
+ * sectors past the last readable block.
+ * Therefore, if we hit a medium error within the
+ * last 75 2K sectors, we decrease the saved size
+ * value.
+ */
if (sector < get_capacity(info->disk) &&
drive->probed_capacity - sector < 4 * 75)
set_capacity(info->disk, sector);