tree 0ebc92ce23fe41cebe2a81733e609a9b303522a6
parent e36f1dfce0b45d347927568efe1088821758cc3c
author Tejun Heo <tj@kernel.org> 1410131038 +0900
committer Jens Axboe <axboe@fb.com> 1410192038 -0600

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>