drm/mgag200: use container_of to resolve mga_fbdev from drm_fb_helper

Use container_of instead of casting first structure member.

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/mgag200/mgag200_fb.c b/drivers/gpu/drm/mgag200/mgag200_fb.c
index 5451dc58eff19ccb81d2eb4780c464e314ae6b11..4415af3666ab1116e0a07de45ffe1e272f5f4a9a 100644 (file)
--- a/drivers/gpu/drm/mgag200/mgag200_fb.c
+++ b/drivers/gpu/drm/mgag200/mgag200_fb.c
@@ -158,7 +158,8 @@ static int mgag200fb_create_object(struct mga_fbdev *afbdev,
 static int mgag200fb_create(struct drm_fb_helper *helper,
                           struct drm_fb_helper_surface_size *sizes)
 {
-       struct mga_fbdev *mfbdev = (struct mga_fbdev *)helper;
+       struct mga_fbdev *mfbdev =
+               container_of(helper, struct mga_fbdev, helper);
        struct drm_device *dev = mfbdev->helper.dev;
        struct drm_mode_fb_cmd2 mode_cmd;
        struct mga_device *mdev = dev->dev_private;