From: Fam Zheng <famz@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
famz@redhat.com, linux-scsi@vger.kernel.org,
"James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Subject: [PATCH] sd: Consider max_xfer_blocks if opt_xfer_blocks is unusable
Date: Mon, 27 Mar 2017 22:18:31 +0800 [thread overview]
Message-ID: <20170327141831.20936-1-famz@redhat.com> (raw)
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.
Fixes: ca369d51b3e ("block/sd: Fix device-imposed transfer length limits")
Signed-off-by: Fam Zheng <famz@redhat.com>
---
drivers/scsi/sd.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index fcfeddc..e2e21ab 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2957,6 +2957,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
} else
rw_max = BLK_DEF_MAX_SECTORS;
+ rw_max = min_not_zero(rw_max, dev_max);
/* Combine with controller limits */
q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
--
2.9.3
next reply other threads:[~2017-03-27 14:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-27 14:18 Fam Zheng [this message]
2017-03-27 16:06 ` Laurence Oberman
2017-03-28 2:11 ` Martin K. Petersen
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