[PATCH 3/3] drm/qxl: Fix crash in eviction from, qxl_release_fence_buffer_objects

[Maarten Lankhorst]

This crash was already here before the conversion, but qxl never leaked
hard enough to hit this.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>
---
The crash is probably only going to happen in extreme memory stress
when the system's already fucked, but hey still a bug. :-)

 drivers/gpu/drm/qxl/qxl_release.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 29ab4ec44c40..a6e19c83143e 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -440,7 +440,7 @@ void qxl_release_fence_buffer_objects(struct qxl_release *release)
 
 	/* if only one object on the release its the release itself
 	   since these objects are pinned no need to reserve */
-	if (list_is_singular(&release->bos))
+	if (list_is_singular(&release->bos) || list_empty(&release->bos))
 		return;
 
 	bo = list_first_entry(&release->bos, struct ttm_validate_buffer, head)->bo;
-- 
2.0.4