NDD_WORK_PENDING
dev_put = test_and_clear_bit(NDD_WORK_PENDING, &nvdimm->flags);
set_bit(NDD_WORK_PENDING, &nvdimm->flags);
if (!test_bit(NDD_WORK_PENDING, &nvdimm->flags))
clear_bit(NDD_WORK_PENDING, &nvdimm->flags);