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scsi: sd: Consider max_xfer_blocks if opt_xfer_blocks is unusable 

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]

Cc: <stable@vger.kernel.org> # v4.4+
Fixes: ca369d51b3 ("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>
This commit is contained in:
Fam Zheng 2017-03-28 12:41:26 +08:00 committed by Martin K. Petersen
parent a3902ee983
commit 6780414519
1 changed files with 2 additions and 1 deletions
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3
drivers/scsi/sd.c
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@ -2956,7 +2956,8 @@ 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));