netdev - [PATCH v1 net-next 3/4] net: Hold rtnl_net_lock() in (un)?register_netdevice_notifier

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Message-ID: <20250104063735.36945-4-kuniyu@amazon.com>
Date: Sat, 4 Jan 2025 15:37:34 +0900
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Simon Horman <horms@...nel.org>
CC: Kuniyuki Iwashima <kuniyu@...zon.com>, Kuniyuki Iwashima
	<kuni1840@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH v1 net-next 3/4] net: Hold rtnl_net_lock() in (un)?register_netdevice_notifier_net().

(un)?register_netdevice_notifier_net() hold RTNL before triggering the
notifier for all netdev in the netns.

Let's convert the RTNL to rtnl_net_lock().

Note that the per-netns netdev notifier is protected by per-netns RTNL,
so we do not need to convert it to blocking_notifier.

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
---
 net/core/dev.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 7d49b4018ea2..f6c6559e2548 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1894,9 +1894,10 @@ int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb)
 {
 	int err;
 
-	rtnl_lock();
+	rtnl_net_lock(net);
 	err = __register_netdevice_notifier_net(net, nb, false);
-	rtnl_unlock();
+	rtnl_net_unlock(net);
+
 	return err;
 }
 EXPORT_SYMBOL(register_netdevice_notifier_net);
@@ -1922,9 +1923,10 @@ int unregister_netdevice_notifier_net(struct net *net,
 {
 	int err;
 
-	rtnl_lock();
+	rtnl_net_lock(net);
 	err = __unregister_netdevice_notifier_net(net, nb);
-	rtnl_unlock();
+	rtnl_net_unlock(net);
+
 	return err;
 }
 EXPORT_SYMBOL(unregister_netdevice_notifier_net);
-- 
2.39.5 (Apple Git-154)