[PATCH v3 net-next 10/15] ip6mr: Move unregister_netdevice_many() out of ip6mr_free_table().

[Kuniyuki Iwashima <kuniyu@google.com>]

This is a prep commit to convert ip6mr_net_exit_batch() to
->exit_rtnl().

Let's move unregister_netdevice_many() in ip6mr_free_table()
to its callers.

Now ip6mr_rules_exit() can do batching all tables per netns.

Note that later we will remove RTNL and unregister_netdevice_many()
in ip6mr_rules_init().

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
 net/ipv6/ip6mr.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index c46f6a430d26..30e1aece5f53 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -85,7 +85,8 @@ static DEFINE_SPINLOCK(mfc_unres_lock);
 static struct kmem_cache *mrt_cachep __read_mostly;
 
 static struct mr_table *ip6mr_new_table(struct net *net, u32 id);
-static void ip6mr_free_table(struct mr_table *mrt);
+static void ip6mr_free_table(struct mr_table *mrt,
+			     struct list_head *dev_kill_list);
 
 static void ip6_mr_forward(struct net *net, struct mr_table *mrt,
 			   struct net_device *dev, struct sk_buff *skb,
@@ -238,6 +239,7 @@ static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
 static int __net_init ip6mr_rules_init(struct net *net)
 {
 	struct fib_rules_ops *ops;
+	LIST_HEAD(dev_kill_list);
 	struct mr_table *mrt;
 	int err;
 
@@ -262,7 +264,8 @@ static int __net_init ip6mr_rules_init(struct net *net)
 
 err2:
 	rtnl_lock();
-	ip6mr_free_table(mrt);
+	ip6mr_free_table(mrt, &dev_kill_list);
+	unregister_netdevice_many(&dev_kill_list);
 	rtnl_unlock();
 err1:
 	fib_rules_unregister(ops);
@@ -272,12 +275,15 @@ static int __net_init ip6mr_rules_init(struct net *net)
 static void __net_exit ip6mr_rules_exit(struct net *net)
 {
 	struct mr_table *mrt, *next;
+	LIST_HEAD(dev_kill_list);
 
 	ASSERT_RTNL();
 	list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
 		list_del(&mrt->list);
-		ip6mr_free_table(mrt);
+		ip6mr_free_table(mrt, &dev_kill_list);
 	}
+
+	unregister_netdevice_many(&dev_kill_list);
 	fib_rules_unregister(net->ipv6.mr6_rules_ops);
 }
 
@@ -337,8 +343,12 @@ static int __net_init ip6mr_rules_init(struct net *net)
 
 static void __net_exit ip6mr_rules_exit(struct net *net)
 {
+	LIST_HEAD(dev_kill_list);
+
 	ASSERT_RTNL();
-	ip6mr_free_table(net->ipv6.mrt6);
+	ip6mr_free_table(net->ipv6.mrt6, &dev_kill_list);
+	unregister_netdevice_many(&dev_kill_list);
+
 	net->ipv6.mrt6 = NULL;
 }
 
@@ -403,18 +413,17 @@ static struct mr_table *ip6mr_new_table(struct net *net, u32 id)
 			      ipmr_expire_process, ip6mr_new_table_set);
 }
 
-static void ip6mr_free_table(struct mr_table *mrt)
+static void ip6mr_free_table(struct mr_table *mrt,
+			     struct list_head *dev_kill_list)
 {
 	struct net *net = read_pnet(&mrt->net);
-	LIST_HEAD(dev_kill_list);
 
 	WARN_ON_ONCE(!mr_can_free_table(net));
 
 	timer_shutdown_sync(&mrt->ipmr_expire_timer);
 	mroute_clean_tables(mrt, MRT6_FLUSH_MIFS | MRT6_FLUSH_MIFS_STATIC |
 			    MRT6_FLUSH_MFC | MRT6_FLUSH_MFC_STATIC,
-			    &dev_kill_list);
-	unregister_netdevice_many(&dev_kill_list);
+			    dev_kill_list);
 	rhltable_destroy(&mrt->mfc_hash);
 	kfree(mrt);
 }
-- 
2.53.0.1213.gd9a14994de-goog