[Bluetooth] Add locking for bt_proto array manipulation
[pandora-kernel.git] / net / bluetooth / af_bluetooth.c
index a91fee4..67df99e 100644 (file)
 /* Bluetooth sockets */
 #define BT_MAX_PROTO   8
 static struct net_proto_family *bt_proto[BT_MAX_PROTO];
+static DEFINE_RWLOCK(bt_proto_lock);
 
 int bt_sock_register(int proto, struct net_proto_family *ops)
 {
+       int err = 0;
+
        if (proto < 0 || proto >= BT_MAX_PROTO)
                return -EINVAL;
 
+       write_lock(&bt_proto_lock);
+
        if (bt_proto[proto])
-               return -EEXIST;
+               err = -EEXIST;
+       else
+               bt_proto[proto] = ops;
 
-       bt_proto[proto] = ops;
-       return 0;
+       write_unlock(&bt_proto_lock);
+
+       return err;
 }
 EXPORT_SYMBOL(bt_sock_register);
 
 int bt_sock_unregister(int proto)
 {
+       int err = 0;
+
        if (proto < 0 || proto >= BT_MAX_PROTO)
                return -EINVAL;
 
+       write_lock(&bt_proto_lock);
+
        if (!bt_proto[proto])
-               return -ENOENT;
+               err = -ENOENT;
+       else
+               bt_proto[proto] = NULL;
 
-       bt_proto[proto] = NULL;
-       return 0;
+       write_unlock(&bt_proto_lock);
+
+       return err;
 }
 EXPORT_SYMBOL(bt_sock_unregister);
 
 static int bt_sock_create(struct socket *sock, int proto)
 {
-       int err = 0;
+       int err;
 
        if (proto < 0 || proto >= BT_MAX_PROTO)
                return -EINVAL;
@@ -92,11 +107,18 @@ static int bt_sock_create(struct socket *sock, int proto)
                request_module("bt-proto-%d", proto);
        }
 #endif
+
        err = -EPROTONOSUPPORT;
+
+       read_lock(&bt_proto_lock);
+
        if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
                err = bt_proto[proto]->create(sock, proto);
                module_put(bt_proto[proto]->owner);
        }
+
+       read_unlock(&bt_proto_lock);
+
        return err; 
 }