netdev - [Patch net-next] ipv6: exit early in addrconf

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Message-Id: <1410473236-3346-1-git-send-email-xiyou.wangcong@gmail.com>
Date:	Thu, 11 Sep 2014 15:07:16 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	netdev@...r.kernel.org
Cc:	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	"David S. Miller" <davem@...emloft.net>,
	Cong Wang <xiyou.wangcong@...il.com>
Subject: [Patch net-next] ipv6: exit early in addrconf_notify() if IPv6 is disabled

If IPv6 is explicitly disabled before the interface comes up,
it makes no sense to continue when it comes up, even just
print a message.

(I am not sure about other cases though, so I prefer not to touch)

Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

---
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index ad4598f..12a2efe 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2844,6 +2844,9 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
 		if (dev->flags & IFF_SLAVE)
 			break;
 
+		if (idev && idev->cnf.disable_ipv6)
+			break;
+
 		if (event == NETDEV_UP) {
 			if (!addrconf_qdisc_ok(dev)) {
 				/* device is not ready yet. */
--
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