pnfsblock: don't spinlock when freeing block_dev
bl_free_block_dev() may sleep. We can not call it with spinlock held. Besides, there is no need to take bm_lock as we are last user freeing bm_devlist. Cc: <stable@vger.kernel.org> #3.1+ Signed-off-by: Peng Tao <peng_tao@emc.com> Signed-off-by: Benny Halevy <bhalevy@tonian.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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