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authorGao feng <gaofeng@cn.fujitsu.com>2013-06-16 11:14:30 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-28 16:18:33 -0700
commitf9ebf8ce570a993023dd8bb20a7378f710bba4ac (patch)
parent86fa4bff222f45bc33cc8b720f805b5b28edd19e (diff)
ipv6: don't call addrconf_dst_alloc again when enable lo
[ 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@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 3a07320909cf..f247fa3d0d96 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2357,6 +2357,9 @@ static void init_loopback(struct net_device *dev)
if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
+ if (sp_ifa->rt)
+ continue;
sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
/* Failure cases are ignored */