- if (cl && !cl->level) {
- if (new == NULL &&
- (new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
- &pfifo_qdisc_ops,
- cl->common.classid))
- == NULL)
- return -ENOBUFS;
- sch_tree_lock(sch);
- *old = cl->un.leaf.q;
- cl->un.leaf.q = new;
- if (*old != NULL) {
- qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
- qdisc_reset(*old);
- }
- sch_tree_unlock(sch);
- return 0;
+ if (cl->level)
+ return -EINVAL;
+ if (new == NULL &&
+ (new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
+ &pfifo_qdisc_ops,
+ cl->common.classid)) == NULL)
+ return -ENOBUFS;
+
+ sch_tree_lock(sch);
+ *old = cl->un.leaf.q;
+ cl->un.leaf.q = new;
+ if (*old != NULL) {
+ qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
+ qdisc_reset(*old);