netdev - [PATCH net] xfrm: remove the unnecessary .net

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Message-Id: <120f5509a5c9292b437041e8a4193653adb9a019.1566807951.git.lucien.xin@gmail.com>
Date:   Mon, 26 Aug 2019 16:25:51 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>
Cc:     davem@...emloft.net,
        Steffen Klassert <steffen.klassert@...unet.com>
Subject: [PATCH net] xfrm: remove the unnecessary .net_exit for xfrmi

The xfrm_if(s) on each netns can be deleted when its xfrmi dev is
deleted. xfrmi dev's removal can happen when:

  1. Its phydev is being deleted and NETDEV_UNREGISTER event is
     processed in xfrmi_event() from my last patch.
  2. netns is being removed and all xfrmi devs will be deleted.
  3. rtnl_link_unregister(&xfrmi_link_ops) in xfrmi_fini() when
     xfrm_interface.ko is being unloaded.

So there's no need to use xfrmi_exit_net() to clean any xfrm_if up.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/xfrm/xfrm_interface.c | 23 -----------------------
 1 file changed, 23 deletions(-)

diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
index f3de1f5..3420c71 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -738,30 +738,7 @@ static struct rtnl_link_ops xfrmi_link_ops __read_mostly = {
 	.get_link_net	= xfrmi_get_link_net,
 };
 
-static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn)
-{
-	struct xfrm_if *xi;
-	LIST_HEAD(list);
-
-	xi = rtnl_dereference(xfrmn->xfrmi[0]);
-	if (!xi)
-		return;
-
-	unregister_netdevice_queue(xi->dev, &list);
-	unregister_netdevice_many(&list);
-}
-
-static void __net_exit xfrmi_exit_net(struct net *net)
-{
-	struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
-
-	rtnl_lock();
-	xfrmi_destroy_interfaces(xfrmn);
-	rtnl_unlock();
-}
-
 static struct pernet_operations xfrmi_net_ops = {
-	.exit = xfrmi_exit_net,
 	.id   = &xfrmi_net_id,
 	.size = sizeof(struct xfrmi_net),
 };
-- 
2.1.0