1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index c8a34476570a..af9662e58272 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -131,12 +131,11 @@ static void drm_update_vblank_count(struct drm_device *dev, int crtc)
 
         /* Reinitialize corresponding vblank timestamp if high-precision query
          * available. Skip this step if query unsupported or failed. Will
-         * reinitialize delayed at next vblank interrupt in that case.
+         * reinitialize delayed at next vblank interrupt in that case and
+         * assign 0 for now, to mark the vblanktimestamp as invalid.
          */
-        if (rc) {
-                tslot = atomic_read(&vblank->count) + diff;
-                vblanktimestamp(dev, crtc, tslot) = t_vblank;
-        }
+        tslot = atomic_read(&vblank->count) + diff;
+        vblanktimestamp(dev, crtc, tslot) = rc ? t_vblank : (struct timeval) {0, 0};
 
         smp_mb__before_atomic();
         atomic_add(diff, &vblank->count);