drm/mgag200: Separate device initialization into allocation

Embedding the DRM device instance in struct mga_device will require
changes to device allocation. Moving the device initialization into
its own functions gets it out of the way.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200605135803.19811-12-tzimmermann@suse.de

drivers/gpu/drm/mgag200/mgag200_drv.c

@@ -43,17 +43,11 @@ static struct drm_driver mgag200_driver = {
  * DRM device
  */
 
-static int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
+static int mgag200_device_init(struct mga_device *mdev, unsigned long flags)
 {
-	struct mga_device *mdev;
+	struct drm_device *dev = mdev->dev;
 	int ret, option;
 
-	mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
-	if (mdev == NULL)
-		return -ENOMEM;
-	dev->dev_private = (void *)mdev;
-	mdev->dev = dev;
-
 	mdev->flags = mgag200_flags_from_driver_data(flags);
 	mdev->type = mgag200_type_from_driver_data(flags);
 
@@ -83,15 +77,33 @@ static int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
 
 	ret = mgag200_mm_init(mdev);
 	if (ret)
-		goto err_mm;
+		return ret;
 
 	ret = mgag200_modeset_init(mdev);
 	if (ret) {
 		drm_err(dev, "Fatal error during modeset init: %d\n", ret);
-		goto err_mm;
+		return ret;
 	}
 
 	return 0;
+}
+
+static int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
+{
+	struct mga_device *mdev;
+	int ret;
+
+	mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
+	if (mdev == NULL)
+		return -ENOMEM;
+	dev->dev_private = (void *)mdev;
+	mdev->dev = dev;
+
+	ret = mgag200_device_init(mdev, flags);
+	if (ret)
+		goto err_mm;
+
+	return 0;
 
 err_mm:
 	dev->dev_private = NULL;