drm/exynos: fix a possible null-pointer dereference due to data race in exynos_drm_cr...

[linux-2.6-microblaze.git] / drivers / gpu / drm / exynos / exynos_drm_crtc.c

diff --git a/drivers/gpu/drm/exynos/exynos_drm_crtc.c b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
index 4153f30..d19e796 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_crtc.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_crtc.c
@@ -39,13 +39,12 @@ static void exynos_drm_crtc_atomic_disable(struct drm_crtc *crtc,
        if (exynos_crtc->ops->atomic_disable)
                exynos_crtc->ops->atomic_disable(exynos_crtc);
 
+       spin_lock_irq(&crtc->dev->event_lock);
        if (crtc->state->event && !crtc->state->active) {
-               spin_lock_irq(&crtc->dev->event_lock);
                drm_crtc_send_vblank_event(crtc, crtc->state->event);
-               spin_unlock_irq(&crtc->dev->event_lock);
-
                crtc->state->event = NULL;
        }
+       spin_unlock_irq(&crtc->dev->event_lock);
 }
 
 static int exynos_crtc_atomic_check(struct drm_crtc *crtc,