From: Ming Lei <tom.leiming@gmail.com>
Date: Sat, 10 May 2014 17:01:48 +0000 (+0800)
Subject: blk-mq: bitmap tag: use clear_bit_unlock in bt_clear_tag()
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~49^2~41^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0289b2e110b7824b2f76d194ad6f8f0844e270ad;p=pandora-kernel.git

blk-mq: bitmap tag: use clear_bit_unlock in bt_clear_tag()

The unlock memory barrier need to order access to req in free
path and clearing tag bit, otherwise either request free path
may see a allocated request, or initialized request in allocate
path might be modified by the ongoing free path.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
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