Commit a2de48ca authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
Browse files

Driver core: add device_rename function 



The network layer needs this to convert to using struct device instead
of a struct class_device.

Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 2620efef

drivers/base/core.c

+55 −0
Original line number Diff line number Diff line
@@ -736,3 +736,58 @@ void device_destroy(struct class *class, dev_t devt) 
		device_unregister(dev);

}

EXPORT_SYMBOL_GPL(device_destroy);



/**

 * device_rename - renames a device

 * @dev: the pointer to the struct device to be renamed

 * @new_name: the new name of the device

 */

int device_rename(struct device *dev, char *new_name)

{

	char *old_class_name = NULL;

	char *new_class_name = NULL;

	char *old_symlink_name = NULL;

	int error;



	dev = get_device(dev);

	if (!dev)

		return -EINVAL;



	pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name);



	if ((dev->class) && (dev->parent))

		old_class_name = make_class_name(dev->class->name, &dev->kobj);



	if (dev->class) {

		old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);

		if (!old_symlink_name)

			return -ENOMEM;

		strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE);

	}



	strlcpy(dev->bus_id, new_name, BUS_ID_SIZE);



	error = kobject_rename(&dev->kobj, new_name);



	if (old_class_name) {

		new_class_name = make_class_name(dev->class->name, &dev->kobj);

		if (new_class_name) {

			sysfs_create_link(&dev->parent->kobj, &dev->kobj,

					  new_class_name);

			sysfs_remove_link(&dev->parent->kobj, old_class_name);

		}

	}

	if (dev->class) {

		sysfs_remove_link(&dev->class->subsys.kset.kobj,

				  old_symlink_name);

		sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj,

				  dev->bus_id);

	}

	put_device(dev);



	kfree(old_class_name);

	kfree(new_class_name);

	kfree(old_symlink_name);



	return error;

}

include/linux/device.h

+1 −0
Original line number Diff line number Diff line
@@ -380,6 +380,7 @@ extern int device_add(struct device * dev); 
extern void device_del(struct device * dev);

extern int device_for_each_child(struct device *, void *,

		     int (*fn)(struct device *, void *));

extern int device_rename(struct device *dev, char *new_name);



/*

 * Manual binding of a device to driver. See drivers/base/bus.c