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-rw-r--r--drivers/gpu/drm/drm_crtc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index c9f9f3d..a7dc1e2 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1980,6 +1980,9 @@ int drm_mode_set_config_internal(struct drm_mode_set *set)
ret = crtc->funcs->set_config(set);
if (ret == 0) {
+ /* crtc->fb must be updated by ->set_config, enforces this. */
+ WARN_ON(fb != crtc->fb);
+
if (old_fb)
drm_framebuffer_unreference(old_fb);
if (fb)