net: Simplify pppoe pernet operations.

Take advantage of the new pernet automatic storage management,
and stop using compatibility network namespace functions.
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/pppoe.c

@@ -1139,59 +1139,37 @@ static struct pppox_proto pppoe_proto = {
 
 static __net_init int pppoe_init_net(struct net *net)
 {
-	struct pppoe_net *pn;
+	struct pppoe_net *pn = pppoe_pernet(net);
 	struct proc_dir_entry *pde;
-	int err;
-
-	pn = kzalloc(sizeof(*pn), GFP_KERNEL);
-	if (!pn)
-		return -ENOMEM;
 
 	rwlock_init(&pn->hash_lock);
 
-	err = net_assign_generic(net, pppoe_net_id, pn);
-	if (err)
-		goto out;
-
 	pde = proc_net_fops_create(net, "pppoe", S_IRUGO, &pppoe_seq_fops);
 #ifdef CONFIG_PROC_FS
-	if (!pde) {
-		err = -ENOMEM;
-		goto out;
-	}
+	if (!pde)
+		return -ENOMEM;
 #endif
 
 	return 0;
-
-out:
-	kfree(pn);
-	return err;
 }
 
 static __net_exit void pppoe_exit_net(struct net *net)
 {
-	struct pppoe_net *pn;
-
 	proc_net_remove(net, "pppoe");
-	pn = net_generic(net, pppoe_net_id);
-	/*
-	 * if someone has cached our net then
-	 * further net_generic call will return NULL
-	 */
-	net_assign_generic(net, pppoe_net_id, NULL);
-	kfree(pn);
 }
 
 static struct pernet_operations pppoe_net_ops = {
 	.init = pppoe_init_net,
 	.exit = pppoe_exit_net,
+	.id   = &pppoe_net_id,
+	.size = sizeof(struct pppoe_net),
 };
 
 static int __init pppoe_init(void)
 {
 	int err;
 
-	err = register_pernet_gen_device(&pppoe_net_id, &pppoe_net_ops);
+	err = register_pernet_device(&pppoe_net_ops);
 	if (err)
 		goto out;
 
@@ -1212,7 +1190,7 @@ static int __init pppoe_init(void)
 out_unregister_pppoe_proto:
 	proto_unregister(&pppoe_sk_proto);
 out_unregister_net_ops:
-	unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops);
+	unregister_pernet_device(&pppoe_net_ops);
 out:
 	return err;
 }
@@ -1224,7 +1202,7 @@ static void __exit pppoe_exit(void)
 	dev_remove_pack(&pppoes_ptype);
 	unregister_pppox_proto(PX_PROTO_OE);
 	proto_unregister(&pppoe_sk_proto);
-	unregister_pernet_gen_device(pppoe_net_id, &pppoe_net_ops);
+	unregister_pernet_device(&pppoe_net_ops);
 }
 
 module_init(pppoe_init);