From: Eric Dumazet <edumazet@google.com>
Date: Tue, 8 Feb 2022 04:50:36 +0000 (-0800)
Subject: can: gw: switch cangw_pernet_exit() to batch mode
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ef0de6696c38cbefba64fc1e29c18882bac1f747;p=linux.git

can: gw: switch cangw_pernet_exit() to batch mode

cleanup_net() is competing with other rtnl users.

Avoiding to acquire rtnl for each netns before calling
cgw_remove_all_jobs() gives chance for cleanup_net()
to progress much faster, holding rtnl a bit longer.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/net/can/gw.c b/net/can/gw.c
index d8861e862f157..24221352e059b 100644
--- a/net/can/gw.c
+++ b/net/can/gw.c
@@ -1239,16 +1239,19 @@ static int __net_init cangw_pernet_init(struct net *net)
 	return 0;
 }
 
-static void __net_exit cangw_pernet_exit(struct net *net)
+static void __net_exit cangw_pernet_exit_batch(struct list_head *net_list)
 {
+	struct net *net;
+
 	rtnl_lock();
-	cgw_remove_all_jobs(net);
+	list_for_each_entry(net, net_list, exit_list)
+		cgw_remove_all_jobs(net);
 	rtnl_unlock();
 }
 
 static struct pernet_operations cangw_pernet_ops = {
 	.init = cangw_pernet_init,
-	.exit = cangw_pernet_exit,
+	.exit_batch = cangw_pernet_exit_batch,
 };
 
 static __init int cgw_module_init(void)