Staging: ipack: remove field driver from struct ipack_device.

After a successful match is found the driver field in struct device is
set by the core device code. We can use this field.
Signed-off-by: Jens Taprogge <jens.taprogge@taprogge.org>
Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ipack/ipack.c

@@ -59,32 +59,29 @@ static int ipack_bus_match(struct device *dev, struct device_driver *drv)
 	const struct ipack_device_id *found_id;
 
 	found_id = ipack_match_id(idrv->id_table, idev);
-	if (found_id) {
-		idev->driver = idrv;
-		return 1;
-	}
-
-	return 0;
+	return found_id ? 1 : 0;
 }
 
 static int ipack_bus_probe(struct device *device)
 {
 	struct ipack_device *dev = to_ipack_dev(device);
+	struct ipack_driver *drv = to_ipack_driver(device->driver);
 
-	if (!dev->driver->ops->probe)
+	if (!drv->ops->probe)
 		return -EINVAL;
 
-	return dev->driver->ops->probe(dev);
+	return drv->ops->probe(dev);
 }
 
 static int ipack_bus_remove(struct device *device)
 {
 	struct ipack_device *dev = to_ipack_dev(device);
+	struct ipack_driver *drv = to_ipack_driver(device->driver);
 
-	if (!dev->driver->ops->remove)
+	if (!drv->ops->remove)
 		return -EINVAL;
 
-	dev->driver->ops->remove(dev);
+	drv->ops->remove(dev);
 	return 0;
 }
 

drivers/staging/ipack/ipack.h

@@ -53,7 +53,6 @@ struct ipack_addr_space {
  *	@bus_nr: IP bus number where the device is plugged
  *	@slot: Slot where the device is plugged in the carrier board
  *	@irq: IRQ vector
- *	@driver: Pointer to the ipack_driver that manages the device
  *	@bus: ipack_bus_device where the device is plugged to.
  *	@id_space: Virtual address to ID space.
  *	@io_space: Virtual address to IO space.
@@ -68,7 +67,6 @@ struct ipack_device {
 	unsigned int bus_nr;
 	unsigned int slot;
 	unsigned int irq;
-	struct ipack_driver *driver;
 	struct ipack_bus_device *bus;
 	struct ipack_addr_space id_space;
 	struct ipack_addr_space io_space;