M_CANFAIL
M_WAIT | M_CANFAIL | M_ZERO);
M_WAITOK | M_CANFAIL | M_ZERO);
(async ? M_NOWAIT : M_WAIT) | M_CANFAIL | M_ZERO);
(async ? M_NOWAIT : M_WAIT) | M_CANFAIL | M_ZERO);
scan_config = malloc(cmd_size, M_DEVBUF, M_WAIT | M_CANFAIL | M_ZERO);
(async ? M_NOWAIT : M_WAIT) | M_CANFAIL | M_ZERO);