linux-kernel - [PATCH 3.19.y-ckt 031/155] md/raid0: apply base queue limits *before* disk_stack

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Message-Id: <1447370309-357-32-git-send-email-kamal@canonical.com>
Date:	Thu, 12 Nov 2015 15:16:25 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	NeilBrown <neilb@...e.com>, Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 031/155] md/raid0: apply base queue limits *before* disk_stack_limits

3.19.8-ckt10 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: NeilBrown <neilb@...e.com>

commit 66eefe5de11db1e0d8f2edc3880d50e7c36a9d43 upstream.

Calling e.g. blk_queue_max_hw_sectors() after calls to
disk_stack_limits() discards the settings determined by
disk_stack_limits().
So we need to make those calls first.

Fixes: 199dc6ed5179 ("md/raid0: update queue parameter in a safer location.")
Reported-by: Jes Sorensen <Jes.Sorensen@...hat.com>
Signed-off-by: NeilBrown <neilb@...e.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/md/raid0.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 910edd2..ff028ae 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -438,12 +438,6 @@ static int raid0_run(struct mddev *mddev)
 		struct md_rdev *rdev;
 		bool discard_supported = false;
 
-		rdev_for_each(rdev, mddev) {
-			disk_stack_limits(mddev->gendisk, rdev->bdev,
-					  rdev->data_offset << 9);
-			if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
-				discard_supported = true;
-		}
 		blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors);
 		blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors);
 		blk_queue_max_discard_sectors(mddev->queue, mddev->chunk_sectors);
@@ -452,6 +446,12 @@ static int raid0_run(struct mddev *mddev)
 		blk_queue_io_opt(mddev->queue,
 				 (mddev->chunk_sectors << 9) * mddev->raid_disks);
 
+		rdev_for_each(rdev, mddev) {
+			disk_stack_limits(mddev->gendisk, rdev->bdev,
+					  rdev->data_offset << 9);
+			if (blk_queue_discard(bdev_get_queue(rdev->bdev)))
+				discard_supported = true;
+		}
 		if (!discard_supported)
 			queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, mddev->queue);
 		else
-- 
1.9.1

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