BINDER_WORK_DEAD_BINDER
ref->death->work.type = BINDER_WORK_DEAD_BINDER;
BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
case BINDER_WORK_DEAD_BINDER:
ref->death->work.type = BINDER_WORK_DEAD_BINDER;
case BINDER_WORK_DEAD_BINDER: