Input: serio - 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/serio/serio.c b/drivers/input/serio/serio.c
index a15e531ec755fae2d8befa7615530676914a703b..5895202b972c01ef1f85cda6a42585759fef65d9 100644 (file)
--- a/drivers/input/serio/serio.c
+++ b/drivers/input/serio/serio.c
@@ -115,18 +115,18 @@ static int serio_match_port(const struct serio_device_id *ids, struct serio *ser
  * Basic serio -> driver core mappings
  */
 
-static void serio_bind_driver(struct serio *serio, struct serio_driver *drv)
+static int serio_bind_driver(struct serio *serio, struct serio_driver *drv)
 {
        int error;
 
-       down_write(&serio_bus.subsys.rwsem);
-
        if (serio_match_port(drv->id_table, serio)) {
+
                serio->dev.driver = &drv->driver;
                if (serio_connect_driver(serio, drv)) {
                        serio->dev.driver = NULL;
-                       goto out;
+                       return -ENODEV;
                }
+
                error = device_bind_driver(&serio->dev);
                if (error) {
                        printk(KERN_WARNING
@@ -136,31 +136,21 @@ static void serio_bind_driver(struct serio *serio, struct serio_driver *drv)
                                drv->description, error);
                        serio_disconnect_driver(serio);
                        serio->dev.driver = NULL;
-                       goto out;
+                       return error;
                }
        }
- out:
-       up_write(&serio_bus.subsys.rwsem);
-}
-
-static void serio_release_driver(struct serio *serio)
-{
-       down_write(&serio_bus.subsys.rwsem);
-       device_release_driver(&serio->dev);
-       up_write(&serio_bus.subsys.rwsem);
+       return 0;
 }
 
 static void serio_find_driver(struct serio *serio)
 {
        int error;
 
-       down_write(&serio_bus.subsys.rwsem);
        error = device_attach(&serio->dev);
        if (error < 0)
                printk(KERN_WARNING
                        "serio: device_attach() failed for %s (%s), error: %d\n",
                        serio->phys, serio->name, error);
-       up_write(&serio_bus.subsys.rwsem);
 }
 
 
@@ -470,13 +460,12 @@ static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *
 {
        struct serio *serio = to_serio_port(dev);
        struct device_driver *drv;
-       int retval;
+       int error;
 
-       retval = mutex_lock_interruptible(&serio_mutex);
-       if (retval)
-               return retval;
+       error = mutex_lock_interruptible(&serio_mutex);
+       if (error)
+               return error;
 
-       retval = count;
        if (!strncmp(buf, "none", count)) {
                serio_disconnect_port(serio);
        } else if (!strncmp(buf, "reconnect", count)) {
@@ -486,15 +475,15 @@ static ssize_t serio_rebind_driver(struct device *dev, struct device_attribute *
                serio_find_driver(serio);
        } else if ((drv = driver_find(buf, &serio_bus)) != NULL) {
                serio_disconnect_port(serio);
-               serio_bind_driver(serio, to_serio_driver(drv));
+               error = serio_bind_driver(serio, to_serio_driver(drv));
                put_driver(drv);
        } else {
-               retval = -EINVAL;
+               error = -EINVAL;
        }
 
        mutex_unlock(&serio_mutex);
 
-       return retval;
+       return error ? error : count;
 }
 
 static ssize_t serio_show_bind_mode(struct device *dev, struct device_attribute *attr, char *buf)
@@ -665,7 +654,7 @@ static void serio_disconnect_port(struct serio *serio)
                do {
                        parent = s->parent;
 
-                       serio_release_driver(s);
+                       device_release_driver(&s->dev);
                        serio_destroy_port(s);
                } while ((s = parent) != serio);
        }
@@ -673,7 +662,7 @@ static void serio_disconnect_port(struct serio *serio)
        /*
         * Ok, no children left, now disconnect this port
         */
-       serio_release_driver(serio);
+       device_release_driver(&serio->dev);
 }
 
 void serio_rescan(struct serio *serio)