drm/qxl: balance dumb_shadow_bo pin

The shadow bo is created in pinned state, so we have to unpin it when
dropping the reference.  Otherwise ttm is unhappy and throws a WARN()
on release.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: http://patchwork.freedesktop.org/patch/msgid/20210511104522.2694803-3-kraxel@redhat.com

diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index be51837..9e0a1e8 100644 (file)
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -801,6 +801,7 @@ static void qxl_prepare_shadow(struct qxl_device *qdev, struct qxl_bo *user_bo,
            qdev->dumb_shadow_bo->surf.width  != surf.width ||
            qdev->dumb_shadow_bo->surf.height != surf.height) {
                if (qdev->dumb_shadow_bo) {
+                       qxl_bo_unpin(qdev->dumb_shadow_bo);
                        drm_gem_object_put
                                (&qdev->dumb_shadow_bo->tbo.base);
                        qdev->dumb_shadow_bo = NULL;