driver core: Remove unused parameter for virtual_device_parent()

Function struct kobject *virtual_device_parent(struct device *dev)
does not use its parameter @dev, and the kobject returned also has
nothing deal with specific device, so remove the unused parameter.

Signed-off-by: Zijun Hu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: zijun-hu

drivers/base/base.h

@@ -145,7 +145,7 @@ void auxiliary_bus_init(void);
 static inline void auxiliary_bus_init(void) { }
 #endif
 
-struct kobject *virtual_device_parent(struct device *dev);
+struct kobject *virtual_device_parent(void);
 
 int bus_add_device(struct device *dev);
 void bus_probe_device(struct device *dev);

drivers/base/bus.c

@@ -1296,7 +1296,7 @@ int subsys_virtual_register(const struct bus_type *subsys,
 {
 	struct kobject *virtual_dir;
 
-	virtual_dir = virtual_device_parent(NULL);
+	virtual_dir = virtual_device_parent();
 	if (!virtual_dir)
 		return -ENOMEM;
 

drivers/base/core.c

@@ -3171,7 +3171,7 @@ void device_initialize(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(device_initialize);
 
-struct kobject *virtual_device_parent(struct device *dev)
+struct kobject *virtual_device_parent(void)
 {
 	static struct kobject *virtual_dir = NULL;
 
@@ -3249,7 +3249,7 @@ static struct kobject *get_device_parent(struct device *dev,
 		 * in a "glue" directory to prevent namespace collisions.
 		 */
 		if (parent == NULL)
-			parent_kobj = virtual_device_parent(dev);
+			parent_kobj = virtual_device_parent();
 		else if (parent->class && !dev->class->ns_type) {
 			subsys_put(sp);
 			return &parent->kobj;