[PATCH net v2] mctp: check register_netdevice_notifier() error in mctp_device_init()

mctp_device_init() handles errors from rtnl_af_register() and
rtnl_register_many(), but ignores the return value of
register_netdevice_notifier(). If notifier registration fails, init can
still return success while the module is only partially initialized.

Check the notifier registration error and fail module init early.

Fixes: d51705614f66 ("mctp: Handle error of rtnl_register_module().")
Signed-off-by: Minhong He <redacted>
---
 net/mctp/device.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/mctp/device.c b/net/mctp/device.c
index 2c84df674669..822120e860c8 100644
--- a/net/mctp/device.c
+++ b/net/mctp/device.c

@@ -536,7 +536,9 @@ int __init mctp_device_init(void)
 {
 	int err;
 
-	register_netdevice_notifier(&mctp_dev_nb);
+	err = register_netdevice_notifier(&mctp_dev_nb);
+	if (err)
+		return err;
 
 	err = rtnl_af_register(&mctp_af_ops);
 	if (err)

-- 
2.25.1