From: Tom Yan <tom.ty89@xxxxxxxxx>
The SCSI disk driver sets max_sector to BLK_DEF_MAX_SECTORS when
the device does not report Optimal Transfer Length. However, it
checks only whether it is smaller than max_hw_sectors, but not
max_dev_sectors.
Signed-off-by: Tom Yan <tom.ty89@xxxxxxxxx>
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index d3e852a..2b6da13 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2875,8 +2875,11 @@ static int sd_revalidate_disk(struct gendisk *disk)
logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
- } else
+ } else {
rw_max = BLK_DEF_MAX_SECTORS;
+ /* Combine with device limits */
+ rw_max = min(rw_max, q->limits.max_dev_sectors);
+ }
/* Combine with controller limits */
q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
--
2.9.2
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