From: Li RongQing <roy.qing.li@gmail.com>
Date: Thu, 2 Jan 2014 00:49:36 +0000 (+0800)
Subject: ipv6: fix the use of pcpu_tstats in sit
X-Git-Tag: v3.13-rc8~16^2~23
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c3ac17cd6af2687d5881184edd310a5f9c4baa98;p=platform%2Fkernel%2Flinux-stable.git

ipv6: fix the use of pcpu_tstats in sit

when read/write the 64bit data, the correct lock should be hold.

Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index c874822..d3005b3 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -702,8 +702,10 @@ static int ipip6_rcv(struct sk_buff *skb)
 		}
 
 		tstats = this_cpu_ptr(tunnel->dev->tstats);
+		u64_stats_update_begin(&tstats->syncp);
 		tstats->rx_packets++;
 		tstats->rx_bytes += skb->len;
+		u64_stats_update_end(&tstats->syncp);
 
 		netif_rx(skb);