[patch 09/09] [PKT_SCHED]: netem: duplication fix

[Chris Wright]

Netem duplication can cause infinite loop in qdisc_run
because the qlen of the parent qdisc is not affected by the duplication.

Signed-off-by: Stephen Hemminger <shemminger@xxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxx>

Index: 2.6.11.11-net/net/sched/sch_netem.c
===================================================================
--- 2.6.11.11-net.orig/net/sched/sch_netem.c
+++ 2.6.11.11-net/net/sched/sch_netem.c
@@ -184,10 +184,15 @@ static int netem_enqueue(struct sk_buff 
 	/* Random duplication */
 	if (q->duplicate && q->duplicate >= get_crandom(&q->dup_cor)) {
 		struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
-
-		pr_debug("netem_enqueue: dup %p\n", skb2);
-		if (skb2)
-			delay_skb(sch, skb2);
+		if (skb2) {
+			struct Qdisc *rootq = sch->dev->qdisc;
+			u32 dupsave = q->duplicate; 
+
+			/* prevent duplicating a dup... */
+			q->duplicate = 0;
+			rootq->enqueue(skb2, rootq);
+			q->duplicate = dupsave;
+		}
 	}
 
 	/* If doing simple delay then gap == 0 so all packets
-
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