[PATCH net] net: ipvlan: check register_netdevice_notifier() error in ipvlan_init_module()

ipvlan_init_module() ignores register_netdevice_notifier() errors and
continues module initialization, which can leave ipvlan loaded without
its netdev notifier registered.

Check the error and fail module initialization early.

Signed-off-by: Minhong He <[email protected]>
---
 drivers/net/ipvlan/ipvlan_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index ed46439a9f4e..518c7b97deaa 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -1048,7 +1048,9 @@ static int __init ipvlan_init_module(void)
 	int err;
 
 	ipvlan_init_secret();
-	register_netdevice_notifier(&ipvlan_notifier_block);
+	err = register_netdevice_notifier(&ipvlan_notifier_block);
+	if (err)
+		return err;
 #if IS_ENABLED(CONFIG_IPV6)
 	register_inet6addr_notifier(&ipvlan_addr6_notifier_block);
 	register_inet6addr_validator_notifier(
-- 
2.25.1