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>
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@ -48,7 +48,7 @@ void tcf_chain_put_by_act(struct tcf_chain *chain);
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struct tcf_chain *tcf_get_next_chain(struct tcf_block *block,
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struct tcf_chain *chain);
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struct tcf_proto *tcf_get_next_proto(struct tcf_chain *chain,
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struct tcf_proto *tp, bool rtnl_held);
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struct tcf_proto *tp);
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void tcf_block_netif_keep_dst(struct tcf_block *block);
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int tcf_block_get(struct tcf_block **p_block,
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struct tcf_proto __rcu **p_filter_chain, struct Qdisc *q,
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@ -991,13 +991,12 @@ __tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
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*/
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struct tcf_proto *
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tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp,
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bool rtnl_held)
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tcf_get_next_proto(struct tcf_chain *chain, struct tcf_proto *tp)
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{
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struct tcf_proto *tp_next = __tcf_get_next_proto(chain, tp);
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if (tp)
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tcf_proto_put(tp, rtnl_held, NULL);
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tcf_proto_put(tp, true, NULL);
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return tp_next;
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}
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@ -1924,15 +1923,14 @@ static int tfilter_del_notify(struct net *net, struct sk_buff *oskb,
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static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
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struct tcf_block *block, struct Qdisc *q,
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u32 parent, struct nlmsghdr *n,
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struct tcf_chain *chain, int event,
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bool rtnl_held)
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struct tcf_chain *chain, int event)
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{
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struct tcf_proto *tp;
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for (tp = tcf_get_next_proto(chain, NULL, rtnl_held);
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tp; tp = tcf_get_next_proto(chain, tp, rtnl_held))
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for (tp = tcf_get_next_proto(chain, NULL);
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tp; tp = tcf_get_next_proto(chain, tp))
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tfilter_notify(net, oskb, n, tp, block,
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q, parent, NULL, event, false, rtnl_held);
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q, parent, NULL, event, false, true);
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}
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static void tfilter_put(struct tcf_proto *tp, void *fh)
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@ -2262,7 +2260,7 @@ static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
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if (prio == 0) {
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tfilter_notify_chain(net, skb, block, q, parent, n,
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chain, RTM_DELTFILTER, rtnl_held);
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chain, RTM_DELTFILTER);
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tcf_chain_flush(chain, rtnl_held);
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err = 0;
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goto errout;
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@ -2895,7 +2893,7 @@ replay:
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break;
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case RTM_DELCHAIN:
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tfilter_notify_chain(net, skb, block, q, parent, n,
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chain, RTM_DELTFILTER, true);
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chain, RTM_DELTFILTER);
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/* Flush the chain first as the user requested chain removal. */
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tcf_chain_flush(chain, true);
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/* In case the chain was successfully deleted, put a reference
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@ -1943,8 +1943,8 @@ static int tc_bind_class_walker(struct Qdisc *q, unsigned long cl,
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chain = tcf_get_next_chain(block, chain)) {
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struct tcf_proto *tp;
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for (tp = tcf_get_next_proto(chain, NULL, true);
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tp; tp = tcf_get_next_proto(chain, tp, true)) {
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for (tp = tcf_get_next_proto(chain, NULL);
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tp; tp = tcf_get_next_proto(chain, tp)) {
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struct tcf_bind_args arg = {};
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arg.w.fn = tcf_node_bind;
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