From 284f9201597d8be6378a76f7dedc9e8b318ced09 Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Mon, 21 May 2012 09:26:59 +1000 Subject: [PATCH] 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 Signed-off-by: NeilBrown Signed-off-by: Ben Hutchings --- drivers/md/md.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index adcd850335b1a..700ecaed62d5c 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -453,7 +453,7 @@ 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; -- 2.47.3