[IPV4/IPV6]: Fail registration if inet device construction fails

Now that netdev notifications can fail, we can use this to signal
errors during registration for IPv4/IPv6.  In particular, if we
fail to allocate memory for the inet device, we can fail the netdev
registration.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 3 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 06012920912..91ef3be5aba 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2256,14 +2256,14 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
         struct net_device *dev = (struct net_device *) data;
         struct inet6_dev *idev = __in6_dev_get(dev);
         int run_pending = 0;
+        int err;
 
         switch(event) {
         case NETDEV_REGISTER:
                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
                         idev = ipv6_add_dev(dev);
                         if (!idev)
-                                printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
-                                        dev->name);
+                                return notifier_from_errno(-ENOMEM);
                 }
                 break;
         case NETDEV_UP:
@@ -2373,7 +2373,9 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
                                               NULL);
                         addrconf_sysctl_register(idev, &idev->cnf);
 #endif
-                        snmp6_register_dev(idev);
+                        err = snmp6_register_dev(idev);
+                        if (err)
+                                return notifier_from_errno(err);
                 }
                 break;
         }