[patch 30/47] udp: increments sk_drops in __udp_queue_rcv_skb()

[Greg KH <gregkh@suse.de>]

[-- Attachment #1: udp-increments-sk_drops-in-__udp_queue_rcv_skb.patch --]
[-- Type: text/plain, Size: 1046 bytes --]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Eric Dumazet <dada1@cosmosbay.com>

[ Upstream commit e408b8dcb5ce42243a902205005208e590f28454 ]

Commit 93821778def10ec1e69aa3ac10adee975dad4ff3 (udp: Fix rcv socket
locking) accidentally removed sk_drops increments for UDP IPV4
sockets.

This field can be used to detect incorrect sizing of socket receive
buffers.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 net/ipv4/udp.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -959,9 +959,11 @@ static int __udp_queue_rcv_skb(struct so
 
 	if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) {
 		/* Note that an ENOMEM error is charged twice */
-		if (rc == -ENOMEM)
+		if (rc == -ENOMEM) {
 			UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
 					 is_udplite);
+			atomic_inc(&sk->sk_drops);
+		}
 		goto drop;
 	}