[PATCH net] net: lapbether: check register_netdevice_notifier() error in lapbeth_init_driver()

lapbeth_init_driver() ignores register_netdevice_notifier() errors and
always returns success, which can leave the module loaded without its
netdev notifier registered.

Check the error and remove the packet type on failure.

Signed-off-by: Minhong He <[email protected]>
---
 drivers/net/wan/lapbether.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wan/lapbether.c b/drivers/net/wan/lapbether.c
index 9861c99ea56c..c3630a82913b 100644
--- a/drivers/net/wan/lapbether.c
+++ b/drivers/net/wan/lapbether.c
@@ -497,9 +497,15 @@ static const char banner[] __initconst =
 
 static int __init lapbeth_init_driver(void)
 {
+	int err;
+
 	dev_add_pack(&lapbeth_packet_type);
 
-	register_netdevice_notifier(&lapbeth_dev_notifier);
+	err = register_netdevice_notifier(&lapbeth_dev_notifier);
+	if (err) {
+		dev_remove_pack(&lapbeth_packet_type);
+		return err;
+	}
 
 	printk(banner);
 
-- 
2.25.1