From patchwork Wed Jan 23 07:09:51 2013
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Subject: [net-next,2/2] net: add RCU annotation to sk_dst_cache field
From: Amerigo Wang <amwang@redhat.com>
X-Patchwork-Id: 214818
Message-Id: <1358924991-1602-2-git-send-email-amwang@redhat.com>
To: netdev@vger.kernel.org
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
 "David S. Miller" <davem@davemloft.net>, Cong Wang <amwang@redhat.com>
Date: Wed, 23 Jan 2013 15:09:51 +0800

From: Cong Wang <amwang@redhat.com>

sock->sk_dst_cache is protected by RCU.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>

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diff --git a/include/net/sock.h b/include/net/sock.h
index 5a34e2f..c4b64c6 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -337,7 +337,7 @@ struct sock {
 #endif
 	unsigned long 		sk_flags;
 	struct dst_entry	*sk_rx_dst;
-	struct dst_entry	*sk_dst_cache;
+	struct dst_entry __rcu	*sk_dst_cache;
 	spinlock_t		sk_dst_lock;
 	atomic_t		sk_wmem_alloc;
 	atomic_t		sk_omem_alloc;