--- xorg_current/mesa/drm/bsd-core/drm_irq.c	2007-07-21 23:13:43.000000000 -0700
+++ drm-mine/bsd-core/drm_irq.c	2007-07-26 20:18:08.000000000 -0700
@@ -241,6 +241,7 @@
 		ret = EINVAL;
 	} else {
 		DRM_LOCK();
+		/* shared code returns -errno */
 		ret = -dev->driver.vblank_wait(dev,
 		    &vblwait->request.sequence);
 		DRM_UNLOCK();