Input: gameport - do not touch bus's rwsem

The subsystem rwsem is not used by the driver core at all, so there is
no point in trying to access it.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index a00fe470a8292847f3607df00973440a98d43d45..bd686a2a517decea484eb9739a7dfe206e781550 100644 (file)
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -190,16 +190,14 @@ static void gameport_run_poll_handler(unsigned long d)
  * Basic gameport -> driver core mappings
  */
 
-static void gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv)
+static int gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv)
 {
        int error;
 
-       down_write(&gameport_bus.subsys.rwsem);
-
        gameport->dev.driver = &drv->driver;
        if (drv->connect(gameport, drv)) {
                gameport->dev.driver = NULL;
-               goto out;
+               return -ENODEV;
        }
 
        error = device_bind_driver(&gameport->dev);
@@ -211,31 +209,21 @@ static void gameport_bind_driver(struct gameport *gameport, struct gameport_driv
                        drv->description, error);
                drv->disconnect(gameport);
                gameport->dev.driver = NULL;
-               goto out;
+               return error;
        }
 
- out:
-       up_write(&gameport_bus.subsys.rwsem);
-}
-
-static void gameport_release_driver(struct gameport *gameport)
-{
-       down_write(&gameport_bus.subsys.rwsem);
-       device_release_driver(&gameport->dev);
-       up_write(&gameport_bus.subsys.rwsem);
+       return 0;
 }
 
 static void gameport_find_driver(struct gameport *gameport)
 {
        int error;
 
-       down_write(&gameport_bus.subsys.rwsem);
        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);
 }
 
 
@@ -483,13 +471,12 @@ static ssize_t gameport_rebind_driver(struct device *dev, struct device_attribut
 {
        struct gameport *gameport = to_gameport_port(dev);
        struct device_driver *drv;
-       int retval;
+       int error;
 
-       retval = mutex_lock_interruptible(&gameport_mutex);
-       if (retval)
-               return retval;
+       error = mutex_lock_interruptible(&gameport_mutex);
+       if (error)
+               return error;
 
-       retval = count;
        if (!strncmp(buf, "none", count)) {
                gameport_disconnect_port(gameport);
        } else if (!strncmp(buf, "reconnect", count)) {
@@ -499,15 +486,15 @@ static ssize_t gameport_rebind_driver(struct device *dev, struct device_attribut
                gameport_find_driver(gameport);
        } else if ((drv = driver_find(buf, &gameport_bus)) != NULL) {
                gameport_disconnect_port(gameport);
-               gameport_bind_driver(gameport, to_gameport_driver(drv));
+               error = gameport_bind_driver(gameport, to_gameport_driver(drv));
                put_driver(drv);
        } else {
-               retval = -EINVAL;
+               error = -EINVAL;
        }
 
        mutex_unlock(&gameport_mutex);
 
-       return retval;
+       return error ? error : count;
 }
 
 static struct device_attribute gameport_device_attrs[] = {
@@ -655,7 +642,7 @@ static void gameport_disconnect_port(struct gameport *gameport)
                do {
                        parent = s->parent;
 
-                       gameport_release_driver(s);
+                       device_release_driver(&s->dev);
                        gameport_destroy_port(s);
                } while ((s = parent) != gameport);
        }
@@ -663,7 +650,7 @@ static void gameport_disconnect_port(struct gameport *gameport)
        /*
         * Ok, no children left, now disconnect this port
         */
-       gameport_release_driver(gameport);
+       device_release_driver(&gameport->dev);
 }
 
 void gameport_rescan(struct gameport *gameport)