[PATCH 2/3] drm/virtio: fix pageflip flush

Gerd Hoffmann
2018-12-05T10:53:16Z

Sending the flush command only makes sense if we actually have
a framebuffer attached to the scanout (handle != 0).

Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
---
 drivers/gpu/drm/virtio/virtgpu_plane.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_plane.c
b/drivers/gpu/drm/virtio/virtgpu_plane.c
index ead5c53d4e..548265b8e8 100644
--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
+++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
@@ -130,11 +130,12 @@ static void virtio_gpu_primary_plane_update(struct
drm_plane *plane,
 				   plane->state->src_h >> 16,
 				   plane->state->src_x >> 16,
 				   plane->state->src_y >> 16);
-	virtio_gpu_cmd_resource_flush(vgdev, handle,
-				      plane->state->src_x >> 16,
-				      plane->state->src_y >> 16,
-				      plane->state->src_w >> 16,
-				      plane->state->src_h >> 16);
+	if (handle)
+		virtio_gpu_cmd_resource_flush(vgdev, handle,
+					      plane->state->src_x >> 16,
+					      plane->state->src_y >> 16,
+					      plane->state->src_w >> 16,
+					      plane->state->src_h >> 16);
 }

 static int virtio_gpu_cursor_prepare_fb(struct drm_plane *plane,
--
2.9.3