From: Patrick McHardy <kaber@trash.net>
Date: Tue, 21 Mar 2006 03:00:49 +0000 (-0800)
Subject: [PKT_SCHED]: Qdisc drop operation is optional
X-Git-Tag: firefly_0821_release~37598^2~151
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6d037a26f08711a222ed0d3d12b09e93eed7d3e8;p=firefly-linux-kernel-4.4.55.git

[PKT_SCHED]: Qdisc drop operation is optional

The drop operation is optional and qdiscs must check if childs support it.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index ba5283204837..7228d30512c7 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -252,9 +252,9 @@ static int netem_requeue(struct sk_buff *skb, struct Qdisc *sch)
 static unsigned int netem_drop(struct Qdisc* sch)
 {
 	struct netem_sched_data *q = qdisc_priv(sch);
-	unsigned int len;
+	unsigned int len = 0;
 
-	if ((len = q->qdisc->ops->drop(q->qdisc)) != 0) {
+	if (q->qdisc->ops->drop && (len = q->qdisc->ops->drop(q->qdisc)) != 0) {
 		sch->q.qlen--;
 		sch->qstats.drops++;
 	}
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 1641db33a994..3395ca7bcadf 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -165,7 +165,7 @@ static unsigned int prio_drop(struct Qdisc* sch)
 
 	for (prio = q->bands-1; prio >= 0; prio--) {
 		qdisc = q->queues[prio];
-		if ((len = qdisc->ops->drop(qdisc)) != 0) {
+		if (qdisc->ops->drop && (len = qdisc->ops->drop(qdisc)) != 0) {
 			sch->q.qlen--;
 			return len;
 		}
diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index cb9711ea8c6c..e9e473457361 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -177,9 +177,9 @@ static int tbf_requeue(struct sk_buff *skb, struct Qdisc* sch)
 static unsigned int tbf_drop(struct Qdisc* sch)
 {
 	struct tbf_sched_data *q = qdisc_priv(sch);
-	unsigned int len;
+	unsigned int len = 0;
 
-	if ((len = q->qdisc->ops->drop(q->qdisc)) != 0) {
+	if (q->qdisc->ops->drop && (len = q->qdisc->ops->drop(q->qdisc)) != 0) {
 		sch->q.qlen--;
 		sch->qstats.drops++;
 	}