tree a005138027964c7e1a3c4402c84bbb8b07247123
parent 9fa8e980bb0a56e46ddd97731f83f608c39aa7a5
author Gao feng <gaofeng@cn.fujitsu.com> 1371352470 +0800
committer David S. Miller <davem@davemloft.net> 1371708290 -0700

ipv6: don't call addrconf_dst_alloc again when enable lo

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>