netdev - [patch net-next v2 2/4] net: push code from net notifier reg/unreg into helpers

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Date:   Sat, 25 Jan 2020 12:17:07 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, jakub.kicinski@...ronome.com,
        saeedm@...lanox.com, leon@...nel.org, tariqt@...lanox.com,
        ayal@...lanox.com, vladbu@...lanox.com, michaelgur@...lanox.com,
        moshe@...lanox.com, mlxsw@...lanox.com, dsahern@...il.com
Subject: [patch net-next v2 2/4] net: push code from net notifier reg/unreg into helpers

From: Jiri Pirko <jiri@...lanox.com>

Push the code which is done under rtnl lock in net notifier register and
unregister function into separate helpers.

Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
v1->v2:
- fixed error path of __register_netdevice_notifier_net()
---
 net/core/dev.c | 60 ++++++++++++++++++++++++++++++++------------------
 1 file changed, 38 insertions(+), 22 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 3cacfb7184e8..7e5aa58ce1ea 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1784,6 +1784,42 @@ int unregister_netdevice_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL(unregister_netdevice_notifier);
 
+static int __register_netdevice_notifier_net(struct net *net,
+					     struct notifier_block *nb,
+					     bool ignore_call_fail)
+{
+	int err;
+
+	err = raw_notifier_chain_register(&net->netdev_chain, nb);
+	if (err)
+		return err;
+	if (dev_boot_phase)
+		return 0;
+
+	err = call_netdevice_register_net_notifiers(nb, net);
+	if (err && !ignore_call_fail)
+		goto chain_unregister;
+
+	return 0;
+
+chain_unregister:
+	raw_notifier_chain_unregister(&net->netdev_chain, nb);
+	return err;
+}
+
+static int __unregister_netdevice_notifier_net(struct net *net,
+					       struct notifier_block *nb)
+{
+	int err;
+
+	err = raw_notifier_chain_unregister(&net->netdev_chain, nb);
+	if (err)
+		return err;
+
+	call_netdevice_unregister_net_notifiers(nb, net);
+	return 0;
+}
+
 /**
  * register_netdevice_notifier_net - register a per-netns network notifier block
  * @net: network namespace
@@ -1804,23 +1840,9 @@ int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb)
 	int err;
 
 	rtnl_lock();
-	err = raw_notifier_chain_register(&net->netdev_chain, nb);
-	if (err)
-		goto unlock;
-	if (dev_boot_phase)
-		goto unlock;
-
-	err = call_netdevice_register_net_notifiers(nb, net);
-	if (err)
-		goto chain_unregister;
-
-unlock:
+	err = __register_netdevice_notifier_net(net, nb, false);
 	rtnl_unlock();
 	return err;
-
-chain_unregister:
-	raw_notifier_chain_unregister(&netdev_chain, nb);
-	goto unlock;
 }
 EXPORT_SYMBOL(register_netdevice_notifier_net);
 
@@ -1846,13 +1868,7 @@ int unregister_netdevice_notifier_net(struct net *net,
 	int err;
 
 	rtnl_lock();
-	err = raw_notifier_chain_unregister(&net->netdev_chain, nb);
-	if (err)
-		goto unlock;
-
-	call_netdevice_unregister_net_notifiers(nb, net);
-
-unlock:
+	err = __unregister_netdevice_notifier_net(net, nb);
 	rtnl_unlock();
 	return err;
 }
-- 
2.21.0