static int binder_inc_ref_for_node(struct binder_proc *proc,
			struct binder_node *node,
			bool strong,
			struct list_head *target_list,
			struct binder_ref_data *rdata)
{
	struct binder_ref *ref;
	struct binder_ref *new_ref = NULL;
	int ret = 0;

	binder_proc_lock(proc);
	ref = binder_get_ref_for_node_olocked(proc, node, NULL);
	if (!ref) {
		binder_proc_unlock(proc);
		new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
		if (!new_ref)
			return -ENOMEM;
		binder_proc_lock(proc);
		ref = binder_get_ref_for_node_olocked(proc, node, new_ref);
	}
	ret = binder_inc_ref_olocked(ref, strong, target_list);
	*rdata = ref->data;
	binder_proc_unlock(proc);
	if (new_ref && ref != new_ref)
		/*
		 * Another thread created the ref first so
		 * free the one we allocated
		 */
		kfree(new_ref);
	return ret;
}
Unknown