Input: serio/gameport - check whether driver core calls succeeded

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 49 insertions, 17 deletions

diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index 36644bff379..3f47ae55c6f 100644
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -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;
 }