DEVLINK_CMD_REGION_DEL
.cmd = DEVLINK_CMD_REGION_DEL,
devlink_nl_region_notify(region, NULL, DEVLINK_CMD_REGION_DEL);
WARN_ON(cmd != DEVLINK_CMD_REGION_NEW && cmd != DEVLINK_CMD_REGION_DEL);
devlink_nl_region_notify(region, NULL, DEVLINK_CMD_REGION_DEL);
devlink_nl_region_notify(region, snapshot, DEVLINK_CMD_REGION_DEL);