driver core: class: mark class_release() as taking a const *

The struct class callback, class_release(), is only called in 2 places,
the pcmcia cardservices code, and in the class driver core code.  Both
places it is safe to mark the structure as a const *, to allow us to
in the future mark all struct class usages as constant and move into
read-only memory.
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/2023040248-outrage-obsolete-5a9a@gregkhSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/class.c

@@ -235,7 +235,7 @@ void class_unregister(const struct class *cls)
 }
 EXPORT_SYMBOL_GPL(class_unregister);
 
-static void class_create_release(struct class *cls)
+static void class_create_release(const struct class *cls)
 {
 	pr_debug("%s called for %s\n", __func__, cls->name);
 	kfree(cls);

drivers/pcmcia/cs.c

@@ -824,7 +824,7 @@ static int pcmcia_socket_uevent(const struct device *dev,
 
 static struct completion pcmcia_unload;
 
-static void pcmcia_release_socket_class(struct class *data)
+static void pcmcia_release_socket_class(const struct class *data)
 {
 	complete(&pcmcia_unload);
 }

include/linux/device/class.h

@@ -58,7 +58,7 @@ struct class {
 	int (*dev_uevent)(const struct device *dev, struct kobj_uevent_env *env);
 	char *(*devnode)(const struct device *dev, umode_t *mode);
 
-	void (*class_release)(struct class *class);
+	void (*class_release)(const struct class *class);
 	void (*dev_release)(struct device *dev);
 
 	int (*shutdown_pre)(struct device *dev);