drm/ast: use container_of to resolve ast_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/ast/ast_fb.c b/drivers/gpu/drm/ast/ast_fb.c
index cba45c7..5c60ae5 100644 (file)
--- a/drivers/gpu/drm/ast/ast_fb.c
+++ b/drivers/gpu/drm/ast/ast_fb.c
@@ -186,7 +186,8 @@ static int astfb_create_object(struct ast_fbdev *afbdev,
 static int astfb_create(struct drm_fb_helper *helper,
                        struct drm_fb_helper_surface_size *sizes)
 {
-       struct ast_fbdev *afbdev = (struct ast_fbdev *)helper;
+       struct ast_fbdev *afbdev =
+               container_of(helper, struct ast_fbdev, helper);
        struct drm_device *dev = afbdev->helper.dev;
        struct drm_mode_fb_cmd2 mode_cmd;
        struct drm_framebuffer *fb;