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Date: Fri, 27 Nov 2020 17:12:05 +0200
From: Vlad Buslov <vladbu@...dia.com>
To: davem@...emloft.net, kuba@...nel.org
Cc: netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
jiri@...nulli.us, Vlad Buslov <vladbu@...dia.com>
Subject: [PATCH net-next] net: sched: remove redundant 'rtnl_held' argument
Functions tfilter_notify_chain() and tcf_get_next_proto() are always called
with rtnl lock held in current implementation. Moreover, attempting to call
them without rtnl lock would cause a warning down the call chain in
function __tcf_get_next_proto() that requires the lock to be held by
callers. Remove the 'rtnl_held' argument in order to simplify the code and
make rtnl lock requirement explicit.
Signed-off-by: Vlad Buslov <vladbu@...dia.com>
---
include/net/pkt_cls.h | 2 +-
net/sched/cls_api.c | 18 ++++++++----------
net/sched/sch_api.c | 4 ++--
3 files changed, 11 insertions(+), 13 deletions(-)
diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 133f9ad4d4f9..0f2a9c44171c 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -48,7 +48,7 @@ void tcf_chain_put_by_act(struct tcf_chain *chain);
struct tcf_chain *tcf_get_next_chain(struct tcf_block *block,
struct tcf_chain *chain);
struct tcf_proto *tcf_get_next_proto(struct tcf_chain *chain,
- struct tcf_proto *tp, bool rtnl_held);
+ struct tcf_proto *tp);
void tcf_block_netif_keep_dst(struct tcf_block *block);
int tcf_block_get(struct tcf_block **p_block,
struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index ff3e943febaa..37b77bd30974 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -991,13 +991,12 @@ __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
*/
struct tcf_proto *
-tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp,
- bool rtnl_held)
+tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
{
struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
if (tp)
- tcf_proto_put(tp, rtnl_held, NULL);
+ tcf_proto_put(tp, true, NULL);
return tp_next;
}
@@ -1924,15 +1923,14 @@ static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
struct tcf_block *block, struct Qdisc *q,
u32 parent, struct nlmsghdr *n,
- struct tcf_chain *chain, int event,
- bool rtnl_held)
+ struct tcf_chain *chain, int event)
{
struct tcf_proto *tp;
- for (tp = tcf_get_next_proto(chain, NULL, rtnl_held);
- tp; tp = tcf_get_next_proto(chain, tp, rtnl_held))
+ for (tp = tcf_get_next_proto(chain, NULL);
+ tp; tp = tcf_get_next_proto(chain, tp))
tfilter_notify(net, oskb, n, tp, block,
- q, parent, NULL, event, false, rtnl_held);
+ q, parent, NULL, event, false, true);
}
static void tfilter_put(struct tcf_proto *tp, void *fh)
@@ -2262,7 +2260,7 @@ static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
if (prio == 0) {
tfilter_notify_chain(net, skb, block, q, parent, n,
- chain, RTM_DELTFILTER, rtnl_held);
+ chain, RTM_DELTFILTER);
tcf_chain_flush(chain, rtnl_held);
err = 0;
goto errout;
@@ -2895,7 +2893,7 @@ static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
break;
case RTM_DELCHAIN:
tfilter_notify_chain(net, skb, block, q, parent, n,
- chain, RTM_DELTFILTER, true);
+ chain, RTM_DELTFILTER);
/* Flush the chain first as the user requested chain removal. */
tcf_chain_flush(chain, true);
/* In case the chain was successfully deleted, put a reference
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 1a2d2471b078..51cb553e4317 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1943,8 +1943,8 @@ static int tc_bind_class_walker(struct Qdisc *q, unsigned long cl,
chain = tcf_get_next_chain(block, chain)) {
struct tcf_proto *tp;
- for (tp = tcf_get_next_proto(chain, NULL, true);
- tp; tp = tcf_get_next_proto(chain, tp, true)) {
+ for (tp = tcf_get_next_proto(chain, NULL);
+ tp; tp = tcf_get_next_proto(chain, tp)) {
struct tcf_bind_args arg = {};
arg.w.fn = tcf_node_bind;
--
2.21.0
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