[UDP]: Avoid repeated counting of checksum errors due to peeking

[linux-2.6-omap-h63xx.git] / net / core / datagram.c

diff --git a/net/core/datagram.c b/net/core/datagram.c
index 029b93e246b45ea934b1da0cd018425e52965fcb..fbd6c76436d062d1068425b6879d25c0f31c8c77 100644 (file)
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -217,20 +217,27 @@ void skb_free_datagram(struct sock *sk, struct sk_buff *skb)
  *     This function currently only disables BH when acquiring the
  *     sk_receive_queue lock.  Therefore it must not be used in a
  *     context where that lock is acquired in an IRQ context.
+ *
+ *     It returns 0 if the packet was removed by us.
  */
 
-void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, unsigned int flags)
+int skb_kill_datagram(struct sock *sk, struct sk_buff *skb, unsigned int flags)
 {
+       int err = 0;
+
        if (flags & MSG_PEEK) {
+               err = -ENOENT;
                spin_lock_bh(&sk->sk_receive_queue.lock);
                if (skb == skb_peek(&sk->sk_receive_queue)) {
                        __skb_unlink(skb, &sk->sk_receive_queue);
                        atomic_dec(&skb->users);
+                       err = 0;
                }
                spin_unlock_bh(&sk->sk_receive_queue.lock);
        }
 
        kfree_skb(skb);
+       return err;
 }
 
 EXPORT_SYMBOL(skb_kill_datagram);