Patch "md/raid0: apply base queue limits *before* disk_stack_limits" has been added to the 4.2-stable tree

Patch "md/raid0: apply base queue limits *before* disk_stack_limits" has been added to the 4.2-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    md/raid0: apply base queue limits *before* disk_stack_limits

to the 4.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     md-raid0-apply-base-queue-limits-before-disk_stack_limits.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 66eefe5de11db1e0d8f2edc3880d50e7c36a9d43 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.com>
Date: Thu, 24 Sep 2015 15:47:47 +1000
Subject: md/raid0: apply base queue limits *before* disk_stack_limits

From: NeilBrown <neilb@suse.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@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/md/raid0.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -431,12 +431,6 @@ 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);
@@ -445,6 +439,12 @@ 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


Patches currently in stable-queue which might be from neilb@suse.com are

queue-4.2/md-raid0-update-queue-parameter-in-a-safer-location.patch
queue-4.2/md-raid0-apply-base-queue-limits-before-disk_stack_limits.patch