md: using GFP_NOIO to allocate bio for flush request

commit b5e1b8cee7ad58a15d2fa79bcd7946acb592602d upstream.

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.

Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index a2b3f21d8ad6d940f6500cd8be2f29b45fa7d44f..8b04a02672b41c5f92b418b758163a23b3b9e1dd 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -409,7 +409,7 @@ 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;