[PATCH] USB: move usb core to use class_simple instead of it's own class functions.

This is needed if the class code is going to be made easier to use, and it makes the code
smaller and easier to understand.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/file.c

@@ -66,16 +66,7 @@ static struct file_operations usb_fops = {
 	.open =		usb_open,
 };
 
-static void release_usb_class_dev(struct class_device *class_dev)
-{
-	dbg("%s - %s", __FUNCTION__, class_dev->class_id);
-	kfree(class_dev);
-}
-
-static struct class usb_class = {
-	.name		= "usb",
-	.release	= &release_usb_class_dev,
-};
+static struct class_simple *usb_class;
 
 int usb_major_init(void)
 {
@@ -87,9 +78,9 @@ int usb_major_init(void)
 		goto out;
 	}
 
-	error = class_register(&usb_class);
-	if (error) {
-		err("class_register failed for usb devices");
+	usb_class = class_simple_create(THIS_MODULE, "usb");
+	if (IS_ERR(usb_class)) {
+		err("class_simple_create failed for usb devices");
 		unregister_chrdev(USB_MAJOR, "usb");
 		goto out;
 	}
@@ -102,7 +93,7 @@ int usb_major_init(void)
 
 void usb_major_cleanup(void)
 {
-	class_unregister(&usb_class);
+	class_simple_destroy(usb_class);
 	devfs_remove("usb");
 	unregister_chrdev(USB_MAJOR, "usb");
 }
@@ -134,7 +125,6 @@ int usb_register_dev(struct usb_interface *intf,
 	int minor_base = class_driver->minor_base;
 	int minor = 0;
 	char name[BUS_ID_SIZE];
-	struct class_device *class_dev;
 	char *temp;
 
 #ifdef CONFIG_USB_DYNAMIC_MINORS
@@ -174,22 +164,18 @@ int usb_register_dev(struct usb_interface *intf,
 	devfs_mk_cdev(MKDEV(USB_MAJOR, minor), class_driver->mode, name);
 
 	/* create a usb class device for this usb interface */
-	class_dev = kmalloc(sizeof(*class_dev), GFP_KERNEL);
-	if (class_dev) {
-		memset(class_dev, 0x00, sizeof(struct class_device));
-		class_dev->devt = MKDEV(USB_MAJOR, minor);
-		class_dev->class = &usb_class;
-		class_dev->dev = &intf->dev;
-
-		temp = strrchr(name, '/');
-		if (temp && (temp[1] != 0x00))
-			++temp;
-		else
-			temp = name;
-		snprintf(class_dev->class_id, BUS_ID_SIZE, "%s", temp);
-		class_set_devdata(class_dev, (void *)(long)intf->minor);
-		class_device_register(class_dev);
-		intf->class_dev = class_dev;
+	temp = strrchr(name, '/');
+	if (temp && (temp[1] != 0x00))
+		++temp;
+	else
+		temp = name;
+	intf->class_dev = class_simple_device_add(usb_class, MKDEV(USB_MAJOR, minor), &intf->dev, "%s", temp);
+	if (IS_ERR(intf->class_dev)) {
+		spin_lock (&minor_lock);
+		usb_minors[intf->minor] = NULL;
+		spin_unlock (&minor_lock);
+		devfs_remove (name);
+		retval = PTR_ERR(intf->class_dev);
 	}
 exit:
 	return retval;
@@ -232,11 +218,8 @@ void usb_deregister_dev(struct usb_interface *intf,
 
 	snprintf(name, BUS_ID_SIZE, class_driver->name, intf->minor - minor_base);
 	devfs_remove (name);
-
-	if (intf->class_dev) {
-		class_device_unregister(intf->class_dev);
-		intf->class_dev = NULL;
-	}
+	class_simple_device_remove(MKDEV(USB_MAJOR, intf->minor));
+	intf->class_dev = NULL;
 	intf->minor = -1;
 }
 EXPORT_SYMBOL(usb_deregister_dev);