From 0289b2e110b7824b2f76d194ad6f8f0844e270ad Mon Sep 17 00:00:00 2001
From: Ming Lei <tom.leiming@gmail.com>
Date: Sun, 11 May 2014 01:01:48 +0800
Subject: [PATCH] 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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