Commit f0cc9a05 authored Sep 22, 2014 by NeilBrown

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: 79ef3a8a
cc: stable@vger.kernel.org (v3.13+)
Reported-by: Brassow Jonathan <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>

parent d030671f

drivers/md/raid1.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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,

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