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H A Ddm-mpath.cdiff a271a89c6e4773478b1c4f8213dfe8351ea66723 Wed Jun 10 15:07:57 CDT 2020 Mike Snitzer <snitzer@redhat.com> dm mpath: take m->lock spinlock when testing QUEUE_IF_NO_PATH

Fix multipath_end_io, multipath_end_io_bio and multipath_busy to take
m->lock while testing if MPATHF_QUEUE_IF_NO_PATH bit is set. These are
all slow-path cases when no paths are available so extra locking isn't a
performance hit. Correctness matters most.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>