linux-kernel - [ 20/59] ipv6: dont call addrconf_dst

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Message-Id: <20130726205015.975319943@linuxfoundation.org>
Date:	Fri, 26 Jul 2013 13:52:44 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Gao feng <gaofeng@...fujitsu.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 20/59] ipv6: dont call addrconf_dst_alloc again when enable lo

3.4-stable review patch.  If anyone has any objections, please let me know.

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

From: Gao feng <gaofeng@...fujitsu.com>

[ Upstream commit a881ae1f625c599b460cc8f8a7fcb1c438f699ad ]

If we disable all of the net interfaces, and enable
un-lo interface before lo interface, we already allocated
the addrconf dst in ipv6_add_addr. So we shouldn't allocate
it again when we enable lo interface.

Otherwise the message below will be triggered.
unregister_netdevice: waiting for sit1 to become free. Usage count = 1

This problem is introduced by commit 25fb6ca4ed9cad72f14f61629b68dc03c0d9713f
"net IPv6 : Fix broken IPv6 routing table after loopback down-up"

Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/addrconf.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2429,6 +2429,9 @@ static void init_loopback(struct net_dev
 			if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
 				continue;
 
+			if (sp_ifa->rt)
+				continue;
+
 			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
 
 			/* Failure cases are ignored */


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