Bluetooth: Fix warnings for bt_key_strings and bt_slock_key_strings

After adding proper lockdep annotations for Bluetooth protocols the case
when lockdep is disabled produced two compiler warnings:

net/bluetooth/af_bluetooth.c:60: warning: ‘bt_key_strings’ defined but not used
net/bluetooth/af_bluetooth.c:71: warning: ‘bt_slock_key_strings’ defined but not used

Fix both of them by adding a CONFIG_DEBUG_LOCK_ALLOC conditional around
them and re-arranging the code a little bit.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/af_bluetooth.c

@@ -51,8 +51,9 @@
 /* Bluetooth sockets */
 #define BT_MAX_PROTO	8
 static struct net_proto_family *bt_proto[BT_MAX_PROTO];
+static DEFINE_RWLOCK(bt_proto_lock);
 
-static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
 static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
 static const char *bt_key_strings[BT_MAX_PROTO] = {
 	"sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
@@ -65,6 +66,7 @@ static const char *bt_key_strings[BT_MAX_PROTO] = {
 	"sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
 };
 
+static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
 static const char *bt_slock_key_strings[BT_MAX_PROTO] = {
 	"slock-AF_BLUETOOTH-BTPROTO_L2CAP",
 	"slock-AF_BLUETOOTH-BTPROTO_HCI",
@@ -75,7 +77,25 @@ static const char *bt_slock_key_strings[BT_MAX_PROTO] = {
 	"slock-AF_BLUETOOTH-BTPROTO_HIDP",
 	"slock-AF_BLUETOOTH-BTPROTO_AVDTP",
 };
-static DEFINE_RWLOCK(bt_proto_lock);
+
+static inline void bt_sock_reclassify_lock(struct socket *sock, int proto)
+{
+	struct sock *sk = sock->sk;
+
+	if (!sk)
+		return;
+
+	BUG_ON(sock_owned_by_user(sk));
+
+	sock_lock_init_class_and_name(sk,
+			bt_slock_key_strings[proto], &bt_slock_key[proto],
+				bt_key_strings[proto], &bt_lock_key[proto]);
+}
+#else
+static inline void bt_sock_reclassify_lock(struct socket *sock, int proto)
+{
+}
+#endif
 
 int bt_sock_register(int proto, struct net_proto_family *ops)
 {
@@ -117,21 +137,6 @@ int bt_sock_unregister(int proto)
 }
 EXPORT_SYMBOL(bt_sock_unregister);
 
-static void bt_reclassify_sock_lock(struct socket *sock, int proto)
-{
-	struct sock *sk = sock->sk;
-
-	if (!sk)
-		return;
-	BUG_ON(sock_owned_by_user(sk));
-
-	sock_lock_init_class_and_name(sk,
-			bt_slock_key_strings[proto],
-			&bt_slock_key[proto],
-			bt_key_strings[proto],
-			&bt_lock_key[proto]);
-}
-
 static int bt_sock_create(struct net *net, struct socket *sock, int proto)
 {
 	int err;
@@ -151,7 +156,7 @@ static int bt_sock_create(struct net *net, struct socket *sock, int proto)
 
 	if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
 		err = bt_proto[proto]->create(net, sock, proto);
-		bt_reclassify_sock_lock(sock, proto);
+		bt_sock_reclassify_lock(sock, proto);
 		module_put(bt_proto[proto]->owner);
 	}