[NET] loopback: Panic if registration fails

Because IPv4 and IPv6 both depend on the presence of the loopback
device to function, failure in registration the loopback device should
be fatal.

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

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 6ba6ed2b480a..5106c2328d12 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -229,7 +229,12 @@ struct net_device loopback_dev = {
 /* Setup and register the loopback device. */
 static int __init loopback_init(void)
 {
-        return register_netdev(&loopback_dev);
+        int err = register_netdev(&loopback_dev);
+
+        if (err)
+                panic("loopback: Failed to register netdevice: %d\n", err);
+
+        return err;
 };
 
 module_init(loopback_init);