From ba6c82cd9d8089354b90632ca8edbb35cc09b9c4 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 17 Oct 2012 13:54:51 +0100
Subject: [PATCH] sna/dri: Defensively check for GTT mmap failure during
 fallback

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

diff --git a/src/sna/sna_dri.c b/src/sna/sna_dri.c
index 15ac46a3..09ecd29b 100644
--- a/src/sna/sna_dri.c
+++ b/src/sna/sna_dri.c
@@ -525,6 +525,9 @@ sna_dri_copy_fallback(struct sna *sna, int bpp,
 	void *dst = kgem_bo_map__gtt(&sna->kgem, dst_bo);
 	void *src = kgem_bo_map__gtt(&sna->kgem, src_bo);
 
+	if (dst == NULL || src == NULL)
+		return;
+
 	DBG(("%s: src(%d, %d), dst(%d, %d) x %d\n",
 	     __FUNCTION__, sx, sy, dx, dy, n));