libnvdimm: btt_devs: Fix locking in namespace_store
Always take device_lock() before nvdimm_bus_lock() to prevent deadlock. Cc: <stable@vger.kernel.org> Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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