linux-kernel - [21/26] ipv6: assign rt6_info to inet6_ifaddr in init

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Date:	Wed, 26 Jun 2013 03:35:59 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Gao feng" <gaofeng@...fujitsu.com>,
	"Arkadiusz Miskiewicz" <a.miskiewicz@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [21/26] ipv6: assign rt6_info to inet6_ifaddr in init_loopback

3.2.48-rc1 review patch.  If anyone has any objections, please let me know.

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

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

[ Upstream commit 534c877928a16ae5f9776436a497109639bf67dc ]

Commit 25fb6ca4ed9cad72f14f61629b68dc03c0d9713f
"net IPv6 : Fix broken IPv6 routing table after loopback down-up"
forgot to assign rt6_info to the inet6_ifaddr.
When disable the net device, the rt6_info which allocated
in init_loopback will not be destroied in __ipv6_ifa_notify.

This will trigger the waring message below
[23527.916091] unregister_netdevice: waiting for tap0 to become free. Usage count = 1

Reported-by: Arkadiusz Miskiewicz <a.miskiewicz@...il.com>
Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/ipv6/addrconf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index d84033b..d603caa 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2437,8 +2437,10 @@ static void init_loopback(struct net_device *dev)
 			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
 
 			/* Failure cases are ignored */
-			if (!IS_ERR(sp_rt))
+			if (!IS_ERR(sp_rt)) {
+				sp_ifa->rt = sp_rt;
 				ip6_ins_rt(sp_rt);
+			}
 		}
 		read_unlock_bh(&idev->lock);
 	}

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