[PATCH v1 net] rtnetlink: Use register_pernet_subsys() in rtnl_net_debug_init().

[Kuniyuki Iwashima <kuniyu@amazon.com>]

rtnl_net_debug_init() registers rtnl_net_debug_net_ops by
register_pernet_device() but calls unregister_pernet_subsys()
in case register_netdevice_notifier() fails.

It corrupts pernet_list because first_device is not updated
in unregister_pernet_device().

Let's fix it by calling register_pernet_subsys() instead.

The _subsys() one fits better for the use case because it keeps
the notifier alive until default_device_exit_net(), giving it
more chance to test NETDEV_UNREGISTER.

Fixes: 03fa53485659 ("rtnetlink: Add ASSERT_RTNL_NET() placeholder for netdev notifier.")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
 net/core/rtnl_net_debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/rtnl_net_debug.c b/net/core/rtnl_net_debug.c
index 7ecd28cc1c22..f3272b09c255 100644
--- a/net/core/rtnl_net_debug.c
+++ b/net/core/rtnl_net_debug.c
@@ -102,7 +102,7 @@ static int __init rtnl_net_debug_init(void)
 {
 	int ret;
 
-	ret = register_pernet_device(&rtnl_net_debug_net_ops);
+	ret = register_pernet_subsys(&rtnl_net_debug_net_ops);
 	if (ret)
 		return ret;
 
-- 
2.48.1