net_sched: remove some unnecessary checks in classful schedulers
The class argument to the ->graft(), ->leaf(), ->dump(), ->dump_stats() all
originate from either ->get() or ->walk() and are always valid.
Remove unnecessary checks.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index ec4d463..85acab9 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1117,30 +1117,29 @@
{
struct htb_class *cl = (struct htb_class *)arg;
- 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);
}
- return -ENOENT;
+ sch_tree_unlock(sch);
+ return 0;
}
static struct Qdisc *htb_leaf(struct Qdisc *sch, unsigned long arg)
{
struct htb_class *cl = (struct htb_class *)arg;
- return (cl && !cl->level) ? cl->un.leaf.q : NULL;
+ return !cl->level ? cl->un.leaf.q : NULL;
}
static void htb_qlen_notify(struct Qdisc *sch, unsigned long arg)