md: using GFP_NOIO to allocate bio for flush request

A flush request is usually issued in transaction commit code path, so
using GFP_KERNEL to allocate memory for flush request bio falls into
the classic deadlock issue.

This is suitable for any -stable kernel to which it applies as it
avoids a possible deadlock.

Cc: stable@vger.kernel.org
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 01233d855eb2..2b30ffdb81b2 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -452,7 +452,7 @@ static void submit_flushes(struct work_struct *ws)
                         atomic_inc(&rdev->nr_pending);
                         atomic_inc(&rdev->nr_pending);
                         rcu_read_unlock();
-                        bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev);
+                        bi = bio_alloc_mddev(GFP_NOIO, 0, mddev);
                         bi->bi_end_io = md_end_flush;
                         bi->bi_private = rdev;
                         bi->bi_bdev = rdev->bdev;