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md/raid1: intialise start_next_window for READ case to avoid hang
authorNeilBrown <neilb@suse.de>
Mon, 22 Sep 2014 00:06:23 +0000 (10:06 +1000)
committerNeilBrown <neilb@suse.de>
Mon, 22 Sep 2014 00:18:03 +0000 (10:18 +1000)
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 <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>

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