From: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Date: Thu, 15 May 2014 05:07:02 +0000 (+0800)
Subject: ip_tunnel: don't add tunnel twice
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ee30ef4d45e7bb64a13e6f3c35b4c75b12a8a4e9;p=linux-beck.git

ip_tunnel: don't add tunnel twice

When using command "ip tunnel add" to add a tunnel, the tunnel will be added twice,
through ip_tunnel_create() and ip_tunnel_update().

Because the second is unnecessary, so we can just break after adding tunnel
through ip_tunnel_create().

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 059176dfab7f..289c6ee388c1 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -754,10 +754,8 @@ int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
 
 		if (!t && (cmd == SIOCADDTUNNEL)) {
 			t = ip_tunnel_create(net, itn, p);
-			if (IS_ERR(t)) {
-				err = PTR_ERR(t);
-				break;
-			}
+			err = PTR_ERR_OR_ZERO(t);
+			break;
 		}
 		if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
 			if (t != NULL) {