drm/nouveau: fix panels using straps-based mode detection

nouveau_bios_fp_mode() zeroes the mode struct before filling in relevant
entries.  This nukes the mode id initialised by drm_mode_create(), and
causes warnings from idr when we try to remove the mode.

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

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 98c214c34922e29adc6e9ecababc1d84cc77de5d..4b286a8c30c8f1621989e7a79e0249492606525c 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -594,8 +594,10 @@ nouveau_connector_get_modes(struct drm_connector *connector)
        if (nv_encoder->dcb->type == OUTPUT_LVDS &&
            (nv_encoder->dcb->lvdsconf.use_straps_for_mode ||
             dev_priv->vbios.fp_no_ddc) && nouveau_bios_fp_mode(dev, NULL)) {
-               nv_connector->native_mode = drm_mode_create(dev);
-               nouveau_bios_fp_mode(dev, nv_connector->native_mode);
+               struct drm_display_mode mode;
+
+               nouveau_bios_fp_mode(dev, &mode);
+               nv_connector->native_mode = drm_mode_duplicate(dev, &mode);
        }
 
        /* Find the native mode if this is a digital panel, if we didn't