vme: make remove callback return void

The driver core ignores the return value of struct bus_type::remove()
because there is only little that can be done. To simplify the quest to
make this function return void, let struct vme_driver::remove return void,
too. There is only a single vme driver and it already returns 0
unconditionally in .remove().

Also fix the bus remove function to always return 0.
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20210127212329.98517-1-uwe@kleine-koenig.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vme/devices/vme_user.c

@@ -689,7 +689,7 @@ static int vme_user_probe(struct vme_dev *vdev)
 	return err;
 }
 
-static int vme_user_remove(struct vme_dev *dev)
+static void vme_user_remove(struct vme_dev *dev)
 {
 	int i;
 
@@ -717,8 +717,6 @@ static int vme_user_remove(struct vme_dev *dev)
 
 	/* Unregister the major and minor device numbers */
 	unregister_chrdev_region(MKDEV(VME_MAJOR, 0), VME_DEVS);
-
-	return 0;
 }
 
 static struct vme_driver vme_user_driver = {

drivers/vme/vme.c

@@ -1997,9 +1997,9 @@ static int vme_bus_remove(struct device *dev)
 
 	driver = dev->platform_data;
 	if (driver->remove)
-		return driver->remove(vdev);
+		driver->remove(vdev);
 
-	return -ENODEV;
+	return 0;
 }
 
 struct bus_type vme_bus_type = {

include/linux/vme.h

@@ -122,7 +122,7 @@ struct vme_driver {
 	const char *name;
 	int (*match)(struct vme_dev *);
 	int (*probe)(struct vme_dev *);
-	int (*remove)(struct vme_dev *);
+	void (*remove)(struct vme_dev *);
 	struct device_driver driver;
 	struct list_head devices;
 };