From: NeilBrown Date: Mon, 22 Sep 2014 00:06:23 +0000 (+1000) Subject: md/raid1: intialise start_next_window for READ case to avoid hang X-Git-Tag: v3.17-rc7~21^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f0cc9a057151892b885be21a1d19b0185568281d;p=platform%2Fkernel%2Flinux-exynos.git md/raid1: intialise start_next_window for READ case to avoid hang r1_bio->start_next_window is not initialised in the READ case, so allow_barrier may incorrectly decrement conf->current_window_requests which can cause raise_barrier() to block forever. Fixes: 79ef3a8aa1cb1523cc231c9a90a278333c21f761 cc: stable@vger.kernel.org (v3.13+) Reported-by: Brassow Jonathan Signed-off-by: NeilBrown --- diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index d7690f8..9ebccf62 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1186,6 +1186,7 @@ read_again: atomic_read(&bitmap->behind_writes) == 0); } r1_bio->read_disk = rdisk; + r1_bio->start_next_window = 0; read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); bio_trim(read_bio, r1_bio->sector - bio->bi_iter.bi_sector,