Bluetooth: Added /proc/net/l2cap via bt_procfs_init()

Added /proc/net/l2cap via bt_procfs_init().
Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

net/bluetooth/l2cap_sock.c

@@ -34,6 +34,10 @@
 #include <net/bluetooth/l2cap.h>
 #include <net/bluetooth/smp.h>
 
+static struct bt_sock_list l2cap_sk_list = {
+	.lock = __RW_LOCK_UNLOCKED(l2cap_sk_list.lock)
+};
+
 static const struct proto_ops l2cap_sock_ops;
 static void l2cap_sock_init(struct sock *sk, struct sock *parent);
 static struct sock *l2cap_sock_alloc(struct net *net, struct socket *sock, int proto, gfp_t prio);
@@ -886,6 +890,8 @@ static int l2cap_sock_release(struct socket *sock)
 	if (!sk)
 		return 0;
 
+	bt_sock_unlink(&l2cap_sk_list, sk);
+
 	err = l2cap_sock_shutdown(sock, 2);
 
 	sock_orphan(sk);
@@ -1210,6 +1216,7 @@ static int l2cap_sock_create(struct net *net, struct socket *sock, int protocol,
 		return -ENOMEM;
 
 	l2cap_sock_init(sk, NULL);
+	bt_sock_link(&l2cap_sk_list, sk);
 	return 0;
 }
 
@@ -1248,21 +1255,30 @@ int __init l2cap_init_sockets(void)
 		return err;
 
 	err = bt_sock_register(BTPROTO_L2CAP, &l2cap_sock_family_ops);
-	if (err < 0)
+	if (err < 0) {
+		BT_ERR("L2CAP socket registration failed");
 		goto error;
+	}
+
+	err = bt_procfs_init(THIS_MODULE, &init_net, "l2cap", &l2cap_sk_list, NULL);
+	if (err < 0) {
+		BT_ERR("Failed to create L2CAP proc file");
+		bt_sock_unregister(BTPROTO_L2CAP);
+		goto error;
+	}
 
 	BT_INFO("L2CAP socket layer initialized");
 
 	return 0;
 
 error:
-	BT_ERR("L2CAP socket registration failed");
 	proto_unregister(&l2cap_proto);
 	return err;
 }
 
 void l2cap_cleanup_sockets(void)
 {
+	bt_procfs_cleanup(&init_net, "l2cap");
 	if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
 		BT_ERR("L2CAP socket unregistration failed");