From 2d433af81cb56603d8541dfe118bb02c69570d6c Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 22 Sep 2014 10:06:23 +1000 Subject: [PATCH] md/raid1: intialise start_next_window for READ case to avoid hang commit f0cc9a057151892b885be21a1d19b0185568281d upstream. 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 Reported-by: Brassow Jonathan Signed-off-by: NeilBrown Signed-off-by: Greg Kroah-Hartman --- drivers/md/raid1.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 665f887..55de4f6 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1185,6 +1185,7 @@ 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, -- 2.7.4