Input: serio/gameport - check whether driver core calls succeeded
[linux-2.6.git] / drivers / input / gameport / gameport.c
index 36644bff379d5126a90d209fc71f8605ab4b74e9..3f47ae55c6f3892f7c6b6952e9cf38ccf7d8585f 100644 (file)
@@ -53,6 +53,7 @@ static LIST_HEAD(gameport_list);
 
 static struct bus_type gameport_bus;
 
+static void gameport_add_driver(struct gameport_driver *drv);
 static void gameport_add_port(struct gameport *gameport);
 static void gameport_destroy_port(struct gameport *gameport);
 static void gameport_reconnect_port(struct gameport *gameport);
@@ -211,8 +212,14 @@ static void gameport_release_driver(struct gameport *gameport)
 
 static void gameport_find_driver(struct gameport *gameport)
 {
+       int error;
+
        down_write(&gameport_bus.subsys.rwsem);
-       device_attach(&gameport->dev);
+       error = device_attach(&gameport->dev);
+       if (error < 0)
+               printk(KERN_WARNING
+                       "gameport: device_attach() failed for %s (%s), error: %d\n",
+                       gameport->phys, gameport->name, error);
        up_write(&gameport_bus.subsys.rwsem);
 }
 
@@ -316,7 +323,6 @@ static void gameport_remove_duplicate_events(struct gameport_event *event)
        spin_unlock_irqrestore(&gameport_event_lock, flags);
 }
 
-
 static struct gameport_event *gameport_get_event(void)
 {
        struct gameport_event *event;
@@ -342,7 +348,6 @@ static struct gameport_event *gameport_get_event(void)
 static void gameport_handle_event(void)
 {
        struct gameport_event *event;
-       struct gameport_driver *gameport_drv;
 
        mutex_lock(&gameport_mutex);
 
@@ -369,8 +374,7 @@ static void gameport_handle_event(void)
                                break;
 
                        case GAMEPORT_REGISTER_DRIVER:
-                               gameport_drv = event->object;
-                               driver_register(&gameport_drv->driver);
+                               gameport_add_driver(event->object);
                                break;
 
                        default:
@@ -532,6 +536,7 @@ static void gameport_init_port(struct gameport *gameport)
        if (gameport->parent)
                gameport->dev.parent = &gameport->parent->dev;
 
+       INIT_LIST_HEAD(&gameport->node);
        spin_lock_init(&gameport->timer_lock);
        init_timer(&gameport->poll_timer);
        gameport->poll_timer.function = gameport_run_poll_handler;
@@ -544,6 +549,8 @@ static void gameport_init_port(struct gameport *gameport)
  */
 static void gameport_add_port(struct gameport *gameport)
 {
+       int error;
+
        if (gameport->parent)
                gameport->parent->child = gameport;
 
@@ -558,8 +565,13 @@ static void gameport_add_port(struct gameport *gameport)
                printk(KERN_INFO "gameport: %s is %s, speed %dkHz\n",
                        gameport->name, gameport->phys, gameport->speed);
 
-       device_add(&gameport->dev);
-       gameport->registered = 1;
+       error = device_add(&gameport->dev);
+       if (error)
+               printk(KERN_ERR
+                       "gameport: device_add() failed for %s (%s), error: %d\n",
+                       gameport->phys, gameport->name, error);
+       else
+               gameport->registered = 1;
 }
 
 /*
@@ -583,10 +595,11 @@ static void gameport_destroy_port(struct gameport *gameport)
 
        if (gameport->registered) {
                device_del(&gameport->dev);
-               list_del_init(&gameport->node);
                gameport->registered = 0;
        }
 
+       list_del_init(&gameport->node);
+
        gameport_remove_pending_events(gameport);
        put_device(&gameport->dev);
 }
@@ -704,11 +717,22 @@ static int gameport_driver_remove(struct device *dev)
 }
 
 static struct bus_type gameport_bus = {
-       .name = "gameport",
-       .probe = gameport_driver_probe,
-       .remove = gameport_driver_remove,
+       .name   = "gameport",
+       .probe  = gameport_driver_probe,
+       .remove = gameport_driver_remove,
 };
 
+static void gameport_add_driver(struct gameport_driver *drv)
+{
+       int error;
+
+       error = driver_register(&drv->driver);
+       if (error)
+               printk(KERN_ERR
+                       "gameport: driver_register() failed for %s, error: %d\n",
+                       drv->driver.name, error);
+}
+
 void __gameport_register_driver(struct gameport_driver *drv, struct module *owner)
 {
        drv->driver.bus = &gameport_bus;
@@ -778,16 +802,24 @@ void gameport_close(struct gameport *gameport)
 
 static int __init gameport_init(void)
 {
-       gameport_task = kthread_run(gameport_thread, NULL, "kgameportd");
-       if (IS_ERR(gameport_task)) {
-               printk(KERN_ERR "gameport: Failed to start kgameportd\n");
-               return PTR_ERR(gameport_task);
-       }
+       int error;
 
        gameport_bus.dev_attrs = gameport_device_attrs;
        gameport_bus.drv_attrs = gameport_driver_attrs;
        gameport_bus.match = gameport_bus_match;
-       bus_register(&gameport_bus);
+       error = bus_register(&gameport_bus);
+       if (error) {
+               printk(KERN_ERR "gameport: failed to register gameport bus, error: %d\n", error);
+               return error;
+       }
+
+       gameport_task = kthread_run(gameport_thread, NULL, "kgameportd");
+       if (IS_ERR(gameport_task)) {
+               bus_unregister(&gameport_bus);
+               error = PTR_ERR(gameport_task);
+               printk(KERN_ERR "gameport: Failed to start kgameportd, error: %d\n", error);
+               return error;
+       }
 
        return 0;
 }