pkt_sched: Fix sch_sfq vs tc_modify_qdisc oops
sch_sfq as a classful qdisc needs the .leaf handler. Otherwise, there
is an oops possible in tc_modify_qdisc()/check_loop().
Fixes commit 7d2681a6ff4f9ab5e48d02550b4c6338f1638998
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index b8bcb20..201cbac 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -508,6 +508,11 @@
return -1;
}
+static struct Qdisc *sfq_leaf(struct Qdisc *sch, unsigned long arg)
+{
+ return NULL;
+}
+
static unsigned long sfq_get(struct Qdisc *sch, u32 classid)
{
return 0;
@@ -575,6 +580,7 @@
}
static const struct Qdisc_class_ops sfq_class_ops = {
+ .leaf = sfq_leaf,
.get = sfq_get,
.put = sfq_put,
.tcf_chain = sfq_find_tcf,