tipc: fix modprobe tipc failed after switch order of device registration

Error message printed:
modprobe: ERROR: could not insert 'tipc': Address family not
supported by protocol.
when modprobe tipc after the following patch: switch order of
device registration, commit 7e27e8d
("tipc: switch order of device registration to fix a crash")

Because sock_create_kern(net, AF_TIPC, ...) is called by
tipc_topsrv_create_listener() in the initialization process
of tipc_net_ops, tipc_socket_init() must be execute before that.

I move tipc_socket_init() into function tipc_init_net().

Fixes: 7e27e8d
("tipc: switch order of device registration to fix a crash")
Signed-off-by: Junwei Hu <hujunwei4@huawei.com>
Reported-by: Wang Wang <wangwang2@huawei.com>
Reviewed-by: Kang Zhou <zhoukang7@huawei.com>
Reviewed-by: Suanming Mou <mousuanming@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: Junwei Hu

net/tipc/core.c

@@ -68,6 +68,10 @@ static int __net_init tipc_init_net(struct net *net)
 	INIT_LIST_HEAD(&tn->node_list);
 	spin_lock_init(&tn->node_list_lock);
 
+	err = tipc_socket_init();
+	if (err)
+		goto out_socket;
+
 	err = tipc_sk_rht_init(net);
 	if (err)
 		goto out_sk_rht;
@@ -94,6 +98,8 @@ static int __net_init tipc_init_net(struct net *net)
 out_nametbl:
 	tipc_sk_rht_destroy(net);
 out_sk_rht:
+	tipc_socket_stop();
+out_socket:
 	return err;
 }
 
@@ -104,6 +110,7 @@ static void __net_exit tipc_exit_net(struct net *net)
 	tipc_bcast_stop(net);
 	tipc_nametbl_stop(net);
 	tipc_sk_rht_destroy(net);
+	tipc_socket_stop();
 }
 
 static struct pernet_operations tipc_net_ops = {
@@ -139,19 +146,13 @@ static int __init tipc_init(void)
 	if (err)
 		goto out_pernet;
 
-	err = tipc_socket_init();
-	if (err)
-		goto out_socket;
-
 	err = tipc_bearer_setup();
 	if (err)
 		goto out_bearer;
 
 	pr_info("Started in single node mode\n");
 	return 0;
 out_bearer:
-	tipc_socket_stop();
-out_socket:
 	unregister_pernet_subsys(&tipc_net_ops);
 out_pernet:
 	tipc_unregister_sysctl();
@@ -167,7 +168,6 @@ static int __init tipc_init(void)
 static void __exit tipc_exit(void)
 {
 	tipc_bearer_cleanup();
-	tipc_socket_stop();
 	unregister_pernet_subsys(&tipc_net_ops);
 	tipc_netlink_stop();
 	tipc_netlink_compat_stop();