[PATCH net] net: macvlan: check register_netdevice_notifier() error in macvlan_init_module()

[Minhong He]

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

Check the error and fail module initialization early.

Signed-off-by: Minhong He <heminhong@xxxxxxxxxx>
---
 drivers/net/macvlan.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 9a4bc99dbf53..4294b433838a 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1906,7 +1906,9 @@ static int __init macvlan_init_module(void)
 {
 	int err;
 
-	register_netdevice_notifier(&macvlan_notifier_block);
+	err = register_netdevice_notifier(&macvlan_notifier_block);
+	if (err)
+		return err;
 
 	err = macvlan_link_register(&macvlan_link_ops);
 	if (err < 0)
-- 
2.25.1