[PATCH] Use the correct size to set block max sectors

From	Long Li <longli@microsoft.com>
Newsgroups	linux.kernel
Subject	[PATCH] Use the correct size to set block max sectors
Date	2016-05-27 00:30 +0200
Message-ID	<rDbWV-3C0-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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The block sector size should be in unit of 512 bytes, not in bytes.

Signed-off-by: Long Li <longli@microsoft.com>

---
 drivers/scsi/sd.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 428c03e..4bce17e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -2862,9 +2862,11 @@ static int sd_revalidate_disk(struct gendisk *disk)
 	if (sdkp->opt_xfer_blocks &&
 	    sdkp->opt_xfer_blocks <= dev_max &&
 	    sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
-	    sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_SIZE)
-		rw_max = q->limits.io_opt =
+	    sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_SIZE) {
+		q->limits.io_opt =
 			sdkp->opt_xfer_blocks * sdp->sector_size;
+		rw_max = (q->limits.io_opt >> 9);
+	}
 	else
 		rw_max = BLK_DEF_MAX_SECTORS;
 
-- 
1.8.5.6

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[PATCH] Use the correct size to set block max sectors Long Li <longli@microsoft.com> - 2016-05-27 00:30 +0200
  Re: [PATCH] Use the correct size to set block max sectors Fam Zheng <famz@redhat.com> - 2016-05-27 02:50 +0200
  Re: [PATCH] Use the correct size to set block max sectors Joe Perches <joe@perches.com> - 2016-05-27 03:40 +0200
  RE: [PATCH] Use the correct size to set block max sectors Long Li <longli@microsoft.com> - 2016-05-27 06:30 +0200

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