From cd313a8d5d1363929bebac83f81e347b4a9e70f1 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sat, 2 Mar 2013 22:52:15 +0000
Subject: [PATCH] sna/dri: Guard against failed batch submission

Avoid dereferencing a NULL bo if we do not submit a batch for the copy
operation.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61708
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 src/sna/sna_dri.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/sna/sna_dri.c b/src/sna/sna_dri.c
index d30c3a4b..e3bca1b1 100644
--- a/src/sna/sna_dri.c
+++ b/src/sna/sna_dri.c
@@ -725,7 +725,8 @@ sna_dri_copy_to_front(struct sna *sna, DrawablePtr draw, RegionPtr region,
 		if (flush) { /* STAT! */
 			struct kgem_request *rq = sna->kgem.next_request;
 			kgem_submit(&sna->kgem);
-			bo = kgem_bo_reference(rq->bo);
+			if (rq->bo)
+				bo = kgem_bo_reference(rq->bo);
 		}
 	}