[PATCH 1/1] scsi: sd: Rounddown host->opt_sectors to logical

[Lukas Herbolt <lukas@herbolt.com>]

The host->opt_sectors are by default 512 bytes aligned if we have 4KN SAS
disk reporting zero or smaller opt_xfer_block than the host->opt_sectors
we will end up with unaligned queue_limit->io_opt.

Signed-off-by: Lukas Herbolt <lukas@herbolt.com>
---
 drivers/scsi/sd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 5b8668accf8e8..382474c3555c3 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3787,7 +3787,8 @@ static int sd_revalidate_disk(struct gendisk *disk)
 	 * an impact on performance for when the size of a request exceeds this
 	 * host limit.
 	 */
-	lim.io_opt = sdp->host->opt_sectors << SECTOR_SHIFT;
+	lim.io_opt = rounddown(lim.logical_block_size,
+			sdp->host->opt_sectors << SECTOR_SHIFT);
 	if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
 		lim.io_opt = min_not_zero(lim.io_opt,
 				logical_to_bytes(sdp, sdkp->opt_xfer_blocks));
-- 
2.51.1