From: NeilBrown <neilb@suse.de>
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: fixes-for-v3.18-merge-window~77^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f0cc9a057151892b885be21a1d19b0185568281d;p=pandora-kernel.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 <jbrassow@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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