From feef53005b57d6b4489a15f8d0db8245dcb0cfaa Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 27 Sep 2012 13:36:55 +0100
Subject: [PATCH] uxa: Do not attempt to pageflip whilst not master

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 src/intel_dri.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/intel_dri.c b/src/intel_dri.c
index ccb10d11..b0e48304 100644
--- a/src/intel_dri.c
+++ b/src/intel_dri.c
@@ -932,6 +932,9 @@ can_exchange(DrawablePtr drawable, DRI2BufferPtr front, DRI2BufferPtr back)
 	struct intel_pixmap *front_intel = intel_get_pixmap_private(front_pixmap);
 	struct intel_pixmap *back_intel = intel_get_pixmap_private(back_pixmap);
 
+	if (!pScrn->vtSema)
+		return FALSE;
+
 	if (I830DRI2DrawablePipe(draw) < 0)
 		return FALSE;