net_sched: make cls_ops->tcf_chain() optional

Some qdiscs don't support attaching filters. Handle this centrally in
cls_api and return a proper errno code (EOPNOTSUPP) instead of EINVAL.

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

1 files changed, 0 insertions, 6 deletions

diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 2bdf241f6315..c27b8023f079 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -331,11 +331,6 @@ static void red_walk(struct Qdisc *sch, struct qdisc_walker *walker)
         }
 }
 
-static struct tcf_proto **red_find_tcf(struct Qdisc *sch, unsigned long cl)
-{
-        return NULL;
-}
-
 static const struct Qdisc_class_ops red_class_ops = {
         .graft          =       red_graft,
         .leaf           =       red_leaf,
@@ -344,7 +339,6 @@ static const struct Qdisc_class_ops red_class_ops = {
         .change         =       red_change_class,
         .delete         =       red_delete,
         .walk           =       red_walk,
-        .tcf_chain      =       red_find_tcf,
         .dump           =       red_dump_class,
 };