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net: fix a lockdep rcu warning in __sk_dst_set()

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__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>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-04-26 20:40:43 +00:00 committed by David S. Miller
parent 18f9f1365d
commit 0b53ff2ead
1 changed files with 5 additions and 2 deletions
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7
include/net/sock.h
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@ -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);
}