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net: suppress lockdep-RCU false positive in FIB trie. 

Allow fib_find_node() to be called either under rcu_read_lock()
protection or with RTNL held.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul E. McKenney 2010-03-21 18:01:05 -07:00 committed by David S. Miller
parent af98441397
commit 634a4b2038
1 changed files with 3 additions and 1 deletions
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4
net/ipv4/fib_trie.c
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@ -961,7 +961,9 @@ fib_find_node(struct trie *t, u32 key)
struct node *n; struct node *n;
pos = 0; pos = 0;
n = rcu_dereference(t->trie); n = rcu_dereference_check(t->trie,
rcu_read_lock_held() ||
lockdep_rtnl_is_held());
while (n != NULL && NODE_TYPE(n) == T_TNODE) { while (n != NULL && NODE_TYPE(n) == T_TNODE) {
tn = (struct tnode *) n; tn = (struct tnode *) n;