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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-03-21 18:01:05 -0700
committerDavid S. Miller <davem@davemloft.net>2010-03-21 18:01:05 -0700
commit634a4b2038a6eba4c211fb906fa2f6ec9a4bbfc7 (patch)
tree69ef8d5afc51d632db7744d94f4de0224e627104 /net/ipv4/fib_trie.c
parentaf98441397227a5a4f212cd48710eea72a14dbdb (diff)
downloadop-kernel-dev-634a4b2038a6eba4c211fb906fa2f6ec9a4bbfc7.zip
op-kernel-dev-634a4b2038a6eba4c211fb906fa2f6ec9a4bbfc7.tar.gz
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>
Diffstat (limited to 'net/ipv4/fib_trie.c')
-rw-r--r--net/ipv4/fib_trie.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index af5d897..01ef8ba 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -961,7 +961,9 @@ fib_find_node(struct trie *t, u32 key)
struct node *n;
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) {
tn = (struct tnode *) n;
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