[PATCH] ipv6: Log the affected address when DAD failure occurs

[Jens Rosenboom <me@jayr.de>]

From: Jens Rosenboom <me@jayr.de>

If an interface has multiple addresses, the current message for DAD
failure isn't really helpful, so this patch adds the address itself to
the printk.

Signed-off-by: Jens Rosenboom <me@jayr.de>

---
This is a resubmit of http://patchwork.ozlabs.org/patch/31196/ which
erroneously was marked as superseded, but using the new compact output format.

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index c9b3690..907a6f7 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1405,8 +1405,8 @@ void addrconf_dad_failure(struct inet6_ifaddr *ifp)
 	struct inet6_dev *idev = ifp->idev;
 
 	if (net_ratelimit())
-		printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
-			ifp->idev->dev->name);
+		printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
+			ifp->idev->dev->name, &ifp->addr);
 
 	if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
 		struct in6_addr addr;