From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Gao feng , "David S. Miller" Subject: [ 14/45] ipv6: dont call addrconf_dst_alloc again when enable lo Date: Fri, 26 Jul 2013 13:57:34 -0700 Message-Id: <20130726205656.475992478@linuxfoundation.org> In-Reply-To: <20130726205654.896050165@linuxfoundation.org> References: <20130726205654.896050165@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Gao feng [ 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 Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv6/addrconf.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -2357,6 +2357,9 @@ static void init_loopback(struct net_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 */