[PATCH net-next-2.6] net: fix a lockdep rcu warning in __sk_dst_set()

[Eric Dumazet <eric.dumazet@gmail.com>]

__sk_dst_set() might be called while no state can be integrated in a
rcu_dereference_check() condition.

So use rcu_dereference_raw() to shutup lockdep warnings (if
CONFIG_PROVE_RCU is set)

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---
diff --git a/include/net/sock.h b/include/net/sock.h
index 86a8ca1..94dbdbc 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1236,8 +1236,11 @@ __sk_dst_set(struct sock *sk, struct dst_entry *dst)
 	struct dst_entry *old_dst;
 
 	sk_tx_queue_clear(sk);
-	old_dst = rcu_dereference_check(sk->sk_dst_cache,
-					lockdep_is_held(&sk->sk_dst_lock));
+	/*
+	 * This can be called while sk is owned by the caller only,
+	 * with no state that can be checked in a rcu_dereference_check() cond
+	 */
+	old_dst = rcu_dereference_raw(sk->sk_dst_cache);
 	rcu_assign_pointer(sk->sk_dst_cache, dst);
 	dst_release(old_dst);
 }