drm/nouveau: handle backlight_device_register failure

Found by smatch.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c
index f65b20a..5d94030 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -84,6 +84,8 @@ nv40_backlight_init(struct drm_connector *connector)
        props.max_brightness = 31;
        bd = backlight_device_register("nv_backlight", &connector->kdev, drm,
                                       &nv40_bl_ops, &props);
+       if (IS_ERR(bd))
+               return PTR_ERR(bd);
        drm->backlight = bd;
        bd->props.brightness = nv40_get_intensity(bd);
        backlight_update_status(bd);