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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: 79ef3a8aa1
cc: stable@vger.kernel.org (v3.13+)
Reported-by: Brassow Jonathan <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2014-09-22 10:06:23 +10:00
parent d030671f3f
commit f0cc9a0571
1 changed files with 1 additions and 0 deletions
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1
drivers/md/raid1.c
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@ -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,