[PATCH] USB: remove private_data pointer from struct usb_interface, as it shouldn't be used anymore

Also added usb_get_intfdata() and usb_set_intfdata() functions to set the
struct usb_interface private pointer easier.

drivers/usb/core/usb.c

@@ -298,7 +298,7 @@ void usb_driver_claim_interface(struct usb_driver *driver, struct usb_interface
 	    dbg("%s driver claimed interface %p", driver->name, iface);
 
 	iface->driver = driver;
-	iface->private_data = priv;
+	usb_set_intfdata(iface, priv);
 }
 
 /**
@@ -341,7 +341,7 @@ void usb_driver_release_interface(struct usb_driver *driver, struct usb_interfac
 		return;
 
 	iface->driver = NULL;
-	iface->private_data = NULL;
+	usb_set_intfdata(iface, NULL);
 }
 
 /**

drivers/usb/misc/usbtest.c

@@ -978,7 +978,6 @@ static void usbtest_disconnect (struct usb_interface *intf)
 
 	dev_set_drvdata (&intf->dev, 0);
 	info ("unbound %s", dev->id);
-	kfree (intf->private_data);
 }
 
 /* Basic testing only needs a device that can source or sink bulk traffic.

include/linux/usb.h

@@ -111,12 +111,21 @@ struct usb_interface {
 	struct usb_driver *driver;	/* driver */
 	kdev_t kdev;			/* node this interface is bound to */
 	struct device dev;		/* interface specific device info */
-	void *private_data;
 };
 #define	to_usb_interface(d) container_of(d, struct usb_interface, dev)
 #define	interface_to_usbdev(intf) \
 	container_of(intf->dev.parent, struct usb_device, dev)
 
+static inline void *usb_get_intfdata (struct usb_interface *intf)
+{
+	return dev_get_drvdata (&intf->dev);
+}
+
+static inline void usb_set_intfdata (struct usb_interface *intf, void *data)
+{
+	return dev_set_drvdata (&intf->dev, data);
+}
+
 /* USB_DT_CONFIG: Configuration descriptor information.
  *
  * USB_DT_OTHER_SPEED_CONFIG is the same descriptor, except that the