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Commit 70f256fd authored by Dmitry Torokhov's avatar Dmitry Torokhov Committed by Greg Kroah-Hartman
Browse files

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: default avatarDmitry Torokhov <dtor@mail.ru>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 75f1115c

drivers/input/serio/serio.c

+15 −26
Original line number Diff line number Diff line
@@ -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)