Commit 853dc2e0 authored Oct 24, 2010 by Ursula Braun Committed by David S. Miller Oct 27, 2010

ipv6: fix refcnt problem related to POSTDAD state



After running this bonding setup script
    modprobe bonding miimon=100 mode=0 max_bonds=1
    ifconfig bond0 10.1.1.1/16
    ifenslave bond0 eth1
    ifenslave bond0 eth3
on s390 with qeth-driven slaves, modprobe -r fails with this message
    unregister_netdevice: waiting for bond0 to become free. Usage count = 1
due to twice detection of duplicate address.
Problem is caused by a missing decrease of ifp->refcnt in addrconf_dad_failure.
An extra call of in6_ifa_put(ifp) solves it.
Problem has been introduced with commit f2344a13.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 66c68bcc

net/ipv6/addrconf.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -1427,8 +1427,10 @@ void addrconf_dad_failure(struct inet6_ifaddr *ifp)
		{
		struct inet6_dev *idev = ifp->idev;

		if (addrconf_dad_end(ifp))
		if (addrconf_dad_end(ifp)) {
		in6_ifa_put(ifp);
		return;
		}

		if (net_ratelimit())
		printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",

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