netdev - [PATCH nf-next,v2 1/5] netfilter: nf_tables: remove rcu read-size lock

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Message-Id: <20211217113837.1253-1-pablo@netfilter.org>
Date:   Fri, 17 Dec 2021 12:38:33 +0100
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org
Subject: [PATCH nf-next,v2 1/5] netfilter: nf_tables: remove rcu read-size lock

Chain stats are updated from the Netfilter hook path which already run
under rcu read-size lock section.

Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
v2: no changes

 net/netfilter/nf_tables_core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/netfilter/nf_tables_core.c b/net/netfilter/nf_tables_core.c
index adc348056076..41c7509955e6 100644
--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -110,7 +110,6 @@ static noinline void nft_update_chain_stats(const struct nft_chain *chain,
 
 	base_chain = nft_base_chain(chain);
 
-	rcu_read_lock();
 	pstats = READ_ONCE(base_chain->stats);
 	if (pstats) {
 		local_bh_disable();
@@ -121,7 +120,6 @@ static noinline void nft_update_chain_stats(const struct nft_chain *chain,
 		u64_stats_update_end(&stats->syncp);
 		local_bh_enable();
 	}
-	rcu_read_unlock();
 }
 
 struct nft_jumpstack {
-- 
2.30.2