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authorVlad Buslov2020-11-27 17:12:05 +0200
committerJakub Kicinski2020-12-01 11:24:56 -0800
commit0fca55ed988a694f5896f36de2a8f18715a78279 (patch)
tree0f303bc1548cf5c875302ba429b69bb68c47f3b8 /net/sched
parentcb7fb043e69a109057fa94510ff5d5602207d548 (diff)
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@nvidia.com> Link: https://lore.kernel.org/r/20201127151205.23492-1-vladbu@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/cls_api.c18
-rw-r--r--net/sched/sch_api.c4
2 files changed, 10 insertions, 12 deletions
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 @@ replay:
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;