From: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Date: Tue, 1 Apr 2014 13:15:47 +0000 (+0200)
Subject: drm/qxl: unset a pointer in sync_obj_unref
X-Git-Tag: firefly_0821_release~3679^2~2302
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=dec8ba10d0770e4361259e52217ec81bea8d96a2;p=firefly-linux-kernel-4.4.55.git

drm/qxl: unset a pointer in sync_obj_unref

commit 41ccec352f3c823931a7d9d2a9c7880c14d7415a upstream.

This fixes a BUG_ON(bo->sync_obj != NULL); in ttm_bo_release_list.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 489cb8cece4d..3401eb86786c 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -431,6 +431,7 @@ static int qxl_sync_obj_flush(void *sync_obj)
 
 static void qxl_sync_obj_unref(void **sync_obj)
 {
+	*sync_obj = NULL;
 }
 
 static void *qxl_sync_obj_ref(void *sync_obj)