assert_spin_locked(&dev->vblank_time_lock);
 
-       if (t_vblank) {
-               /* All writers hold the spinlock, but readers are serialized by
-                * the latching of vblank->count below.
-                */
-               tslot = vblank->count + vblank_count_inc;
-               vblanktimestamp(dev, pipe, tslot) = *t_vblank;
-       }
+       /* All writers hold the spinlock, but readers are serialized by
+        * the latching of vblank->count below.
+        */
+       tslot = vblank->count + vblank_count_inc;
+       vblanktimestamp(dev, pipe, tslot) = *t_vblank;
 
        /*
         * vblank timestamp updates are protected on the write side with