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_tbf.c b/net/sched/sch_tbf.c
index e22dfe85e43e..28909699d24d 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -433,11 +433,6 @@ static void tbf_walk(struct Qdisc *sch, struct qdisc_walker *walker)
         }
 }
 
-static struct tcf_proto **tbf_find_tcf(struct Qdisc *sch, unsigned long cl)
-{
-        return NULL;
-}
-
 static const struct Qdisc_class_ops tbf_class_ops =
 {
         .graft          =       tbf_graft,
@@ -447,7 +442,6 @@ static const struct Qdisc_class_ops tbf_class_ops =
         .change         =       tbf_change_class,
         .delete         =       tbf_delete,
         .walk           =       tbf_walk,
-        .tcf_chain      =       tbf_find_tcf,
         .dump           =       tbf_dump_class,
 };