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ipv6: don't call addrconf_dst_alloc again when enable lo

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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 25fb6ca4ed
"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>
This commit is contained in:
Gao feng 2013-06-16 11:14:30 +08:00 committed by David S. Miller
parent 9fa8e980bb
commit a881ae1f62
1 changed files with 3 additions and 0 deletions
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3
net/ipv6/addrconf.c
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@ -2655,6 +2655,9 @@ static void init_loopback(struct net_device *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 */