dm mpath: add mutex to synchronize adding and flushing work
Add a mutex to allow possible creators of new work to synchronize with flushing work queues. Signed-off-by: NMike Anderson <andmike@linux.vnet.ibm.com> Acked-by: NKiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: NAlasdair G Kergon <agk@redhat.com>
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