cio: remove {get,put}_driver

Remove useless {get,put}_driver - the caller of the functions
has to ensure valid driver pointers.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/s390/cio/ccwgroup.c

@@ -580,7 +580,6 @@ void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
 	struct device *dev;
 
 	/* We don't want ccwgroup devices to live longer than their driver. */
-	get_driver(&cdriver->driver);
 	while ((dev = driver_find_device(&cdriver->driver, NULL, NULL,
 					 __ccwgroup_match_all))) {
 		struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
@@ -592,7 +591,6 @@ void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
 		mutex_unlock(&gdev->reg_mutex);
 		put_device(dev);
 	}
-	put_driver(&cdriver->driver);
 	driver_unregister(&cdriver->driver);
 }
 EXPORT_SYMBOL(ccwgroup_driver_unregister);

drivers/s390/cio/device.c

@@ -1676,15 +1676,9 @@ struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
 				       const char *bus_id)
 {
 	struct device *dev;
-	struct device_driver *drv;
 
-	drv = get_driver(&cdrv->driver);
-	if (!drv)
-		return NULL;
-
-	dev = driver_find_device(drv, NULL, (void *)bus_id,
+	dev = driver_find_device(&cdrv->driver, NULL, (void *)bus_id,
 				 __ccwdev_check_busid);
-	put_driver(drv);
 
 	return dev ? to_ccwdev(dev) : NULL;
 }