From: Gao feng Date: Sun, 16 Jun 2013 03:14:30 +0000 (+0800) Subject: ipv6: don't call addrconf_dst_alloc again when enable lo X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=a881ae1f625c599b460cc8f8a7fcb1c438f699ad;p=deliverable%2Flinux.git 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 Signed-off-by: David S. Miller --- diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 1bbf744c2cc3..77b626136c23 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -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 */