drm/virtio: add missing virtio_gpu_array_lock_resv call

When submitting a fenced command we must lock the object reservations
because virtio_gpu_queue_fenced_ctrl_buffer() unlocks after adding the
fence.

Reported-by: Jann Horn <[email protected]>
Signed-off-by: Gerd Hoffmann <[email protected]>
Reviewed-by: Chia-I Wu <[email protected]>
Tested-by: Jann Horn <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: kraxel

drivers/gpu/drm/virtio/virtgpu_plane.c

@@ -232,6 +232,7 @@ static void virtio_gpu_cursor_plane_update(struct drm_plane *plane,
 		if (!objs)
 			return;
 		virtio_gpu_array_add_obj(objs, vgfb->base.obj[0]);
+		virtio_gpu_array_lock_resv(objs);
 		virtio_gpu_cmd_transfer_to_host_2d
 			(vgdev, 0,
 			 plane->state->crtc_w,