[PATCH v1, 1/1] drm/mediatek: fixup crtc event null pointer issue

[Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>]

if crtc event is null pointer, do not send vblank event

Signed-off-by: Yongqiang Niu <yongqiang.niu@xxxxxxxxxxxx>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index d661edf7e0fe..265fed446628 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -92,6 +92,9 @@ static void mtk_drm_crtc_finish_page_flip(struct mtk_drm_crtc *mtk_crtc)
 	struct drm_crtc *crtc = &mtk_crtc->base;
 	unsigned long flags;
 
+	if (!mtk_crtc->event)
+		return;
+
 	spin_lock_irqsave(&crtc->dev->event_lock, flags);
 	drm_crtc_send_vblank_event(crtc, mtk_crtc->event);
 	drm_crtc_vblank_put(crtc);
-- 
2.25.1