usmp_cmd_t
usmp_cmd_t ucmd_buf;
usmp_cmd_t usmp_cmd_data, *usmp_cmd = &usmp_cmd_data;
if (ddi_copyin((void *)arg, usmp_cmd, sizeof (usmp_cmd_t),
if (ddi_copyin((void *)arg, usmp_cmd, sizeof (usmp_cmd_t), flag)) {