Subject: [PATCH] IPv6 anycast refcnt fix

From: Michal Wrobel <[email-masked]>
Date: Sun, 25 Feb 2007 13:04:21 +0100

This patch fixes a bug in Linux IPv6 stack which caused anycast address
to be added to a device prior DAD has been completed. This led to
incorrect reference count which resulted in infinite wait for
unregister_netdevice completion on interface removal.

Signed-off-by: Michal Wrobel <[email-masked]>

--- linux/net/ipv6/addrconf.c	2007-02-22 19:46:27.000000000 +0100
+++ linux/net/ipv6/addrconf.c	2007-02-25 00:22:37.000000000 +0100
@@ -456,6 +456,8 @@
  			ipv6_dev_mc_dec(dev, &addr);
  	}
  	for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
+		if (ifa->flags&IFA_F_TENTATIVE)
+			continue;
  		if (idev->cnf.forwarding)
  			addrconf_join_anycast(ifa);
  		else