From 4eaa0e3c869acd5dbc7c2e3818a9ae9cbf221d27 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 14 Apr 2010 16:13:29 -0700 Subject: [PATCH] fib: suppress lockdep-RCU false positive in FIB trie. Followup of commit 634a4b20 Allow tnode_get_child_rcu() to be called either under rcu_read_lock() protection or with RTNL held. Signed-off-by: Eric Dumazet Signed-off-by: Paul E. McKenney Signed-off-by: David S. Miller --- net/ipv4/fib_trie.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c index 59a838795e3..c98f115fb0f 100644 --- a/net/ipv4/fib_trie.c +++ b/net/ipv4/fib_trie.c @@ -209,7 +209,9 @@ static inline struct node *tnode_get_child_rcu(struct tnode *tn, unsigned int i) { struct node *ret = tnode_get_child(tn, i); - return rcu_dereference(ret); + return rcu_dereference_check(ret, + rcu_read_lock_held() || + lockdep_rtnl_is_held()); } static inline int tnode_child_length(const struct tnode *tn)