UPSTREAM: pfifo_tail_enqueue: Drop new packet when sch->limit == 0 am: 92ada4b4

Original change: https://android-review.googlesource.com/c/kernel/common/+/3548045



Change-Id: Ic3d9901d7a3b06868e764d2b0de1164350c9dce4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

net/sched/sch_fifo.c

@@ -39,6 +39,9 @@ static int pfifo_tail_enqueue(struct sk_buff *skb, struct Qdisc *sch,
 {
 	unsigned int prev_backlog;
 
+	if (unlikely(sch->limit == 0))
+		return qdisc_drop(skb, sch, to_free);
+
 	if (likely(sch->q.qlen < sch->limit))
 		return qdisc_enqueue_tail(skb, sch);