netdev - [PATCH v3 net-next 12/15] sit: use exit_batch

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Message-ID: <20240205124752.811108-13-edumazet@google.com>
Date: Mon,  5 Feb 2024 12:47:49 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Antoine Tenart <atenart@...nel.org>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v3 net-next 12/15] sit: use exit_batch_rtnl() method

exit_batch_rtnl() is called while RTNL is held,
and devices to be unregistered can be queued in the dev_kill_list.

This saves one rtnl_lock()/rtnl_unlock() pair
and one unregister_netdevice_many() call.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv6/sit.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index cc24cefdb85c0944c03c019b1c4214302d18e2c8..61b2b71fa8bedea6d185348ff781356652434b33 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1875,22 +1875,19 @@ static int __net_init sit_init_net(struct net *net)
 	return err;
 }
 
-static void __net_exit sit_exit_batch_net(struct list_head *net_list)
+static void __net_exit sit_exit_batch_rtnl(struct list_head *net_list,
+					   struct list_head *dev_to_kill)
 {
-	LIST_HEAD(list);
 	struct net *net;
 
-	rtnl_lock();
+	ASSERT_RTNL();
 	list_for_each_entry(net, net_list, exit_list)
-		sit_destroy_tunnels(net, &list);
-
-	unregister_netdevice_many(&list);
-	rtnl_unlock();
+		sit_destroy_tunnels(net, dev_to_kill);
 }
 
 static struct pernet_operations sit_net_ops = {
 	.init = sit_init_net,
-	.exit_batch = sit_exit_batch_net,
+	.exit_batch_rtnl = sit_exit_batch_rtnl,
 	.id   = &sit_net_id,
 	.size = sizeof(struct sit_net),
 };
-- 
2.43.0.594.gd9cf4e227d-goog