drm/nvd9/disp: bail out of mode_set_base if no fb bound to crtc

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nvd0_display.c b/drivers/gpu/drm/nouveau/nvd0_display.c
index 20072fb784a50051cc34babb74ad597516f3c458..23d63b4b3d77078ce4a351f82b8d7cba16d280b7 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvd0_display.c
+++ b/drivers/gpu/drm/nouveau/nvd0_display.c
@@ -391,6 +391,11 @@ nvd0_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
        struct nouveau_crtc *nv_crtc = nouveau_crtc(crtc);
        int ret;
 
+       if (!crtc->fb) {
+               NV_DEBUG_KMS(crtc->dev, "No FB bound\n");
+               return 0;
+       }
+
        ret = nvd0_crtc_swap_fbs(crtc, old_fb);
        if (ret)
                return ret;