while (1) {
cl = list_first_entry(&q->active, struct drr_class, alist);
skb = cl->qdisc->ops->peek(cl->qdisc);
- if (skb == NULL)
+ if (skb == NULL) {
+ qdisc_warn_nonwc(__func__, cl->qdisc);
goto out;
+ }
len = qdisc_pkt_len(skb);
if (len <= cl->deficit) {