diff options
| author | Fam Zheng <famz@redhat.com> | 2017-03-28 12:41:26 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-21 09:31:21 +0200 |
| commit | 82d181d7540fed18ee48487d252dc60920c16d18 (patch) | |
| tree | 2f68475d4196a8ab5f3b6de7e1b63a45fcb1ce18 | |
| parent | c80c158bfe613d346d48803462bf55d8f35d228e (diff) | |
scsi: sd: Consider max_xfer_blocks if opt_xfer_blocks is unusable
commit 6780414519f91c2a84da9baa963a940ac916f803 upstream.
If device reports a small max_xfer_blocks and a zero opt_xfer_blocks, we
end up using BLK_DEF_MAX_SECTORS, which is wrong and r/w of that size
may get error.
[mkp: tweaked to avoid setting rw_max twice and added typecast]
Fixes: ca369d51b3e ("block/sd: Fix device-imposed transfer length limits")
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/scsi/sd.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 51e56296f465..e0796b2e0d2f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -2877,7 +2877,8 @@ static int sd_revalidate_disk(struct gendisk *disk) q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks); rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks); } else - rw_max = BLK_DEF_MAX_SECTORS; + rw_max = min_not_zero(logical_to_sectors(sdp, dev_max), + (sector_t)BLK_DEF_MAX_SECTORS); /* Combine with controller limits */ q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q)); |