[PATCH v3 net-next 13/15] ip6mr: Call fib_rules_unregister() without RTNL.

[Kuniyuki Iwashima <kuniyu@google.com>]

fib_rules_unregister() removes ops from net->rules_ops under
spinlock, calls ops->delete() for each rule, and frees the ops.

ip6mr_rules_ops_template does not have ->delete(), and any
operation does not require RTNL there.

Let's move fib_rules_unregister() from ip6mr_rules_exit_rtnl()
to ip6mr_net_exit().

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
 net/ipv6/ip6mr.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index e5a1d2c48b1b..b1443fb65b40 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -269,6 +269,11 @@ static int __net_init ip6mr_rules_init(struct net *net)
 	return err;
 }
 
+static void __net_exit ip6mr_rules_exit(struct net *net)
+{
+	fib_rules_unregister(net->ipv6.mr6_rules_ops);
+}
+
 static void __net_exit ip6mr_rules_exit_rtnl(struct net *net,
 					     struct list_head *dev_kill_list)
 {
@@ -278,8 +283,6 @@ static void __net_exit ip6mr_rules_exit_rtnl(struct net *net,
 		list_del(&mrt->list);
 		ip6mr_free_table(mrt, dev_kill_list);
 	}
-
-	fib_rules_unregister(net->ipv6.mr6_rules_ops);
 }
 
 static int ip6mr_rules_dump(struct net *net, struct notifier_block *nb,
@@ -336,6 +339,10 @@ static int __net_init ip6mr_rules_init(struct net *net)
 	return 0;
 }
 
+static void __net_exit ip6mr_rules_exit(struct net *net)
+{
+}
+
 static void __net_exit ip6mr_rules_exit_rtnl(struct net *net,
 					     struct list_head *dev_kill_list)
 {
@@ -1364,6 +1371,7 @@ static int __net_init ip6mr_net_init(struct net *net)
 	remove_proc_entry("ip6_mr_vif", net->proc_net);
 proc_vif_fail:
 	ip6mr_rules_exit_rtnl(net, &dev_kill_list);
+	ip6mr_rules_exit(net);
 #endif
 ip6mr_rules_fail:
 	ip6mr_notifier_exit(net);
@@ -1376,6 +1384,7 @@ static void __net_exit ip6mr_net_exit(struct net *net)
 	remove_proc_entry("ip6_mr_cache", net->proc_net);
 	remove_proc_entry("ip6_mr_vif", net->proc_net);
 #endif
+	ip6mr_rules_exit(net);
 	ip6mr_notifier_exit(net);
 }
 
-- 
2.53.0.1213.gd9a14994de-goog