From b68757341d8015d28e261990deea58dd836e04da Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Mon, 8 Sep 2014 08:03:58 +0900
Subject: [PATCH] bdi: remove bdi->wb_lock locking around bdi->dev clearing in
 bdi_unregister()

The only places where NULL test on bdi->dev is used are
bdi_[un]register().  The functions can't be called in parallel anyway
and there's no point in protecting bdi->dev clearing with a lock.
Remove bdi->wb_lock grabbing around bdi->dev clearing and move it
after device_unregister() call so that bdi->dev doesn't have to be
cached in a local variable.

This patch shouldn't introduce any behavior difference.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
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