drm/nouveau/disp: Revert a NULL check inside nouveau_connector_get_modes

commit d5712cd22b9cf109fded1b7f178f4c1888c8b84b upstream.

The original commit adding that check tried to protect the kenrel against
a potential invalid NULL pointer access.

However we call nouveau_connector_detect_depth once without a native_mode
set on purpose for non LVDS connectors and this broke DP support in a few
cases.

Cc: Olaf Skibbe <news@kravcenko.com>
Cc: Lyude Paul <lyude@redhat.com>
Closes: https://gitlab.freedesktop.org/drm/nouveau/-/issues/238
Closes: https://gitlab.freedesktop.org/drm/nouveau/-/issues/245
Fixes: 20a2ce87fbaf8 ("drm/nouveau/dp: check for NULL nv_connector->native_mode")
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230805101813.2603989-1-kherbst@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 4f604d71a46ea78bb4e2b0aa9cd79039a4b3d5a4..ae57a47fbf226376e0b7a0a516c442a29758b0fa 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -945,7 +945,7 @@ nouveau_connector_get_modes(struct drm_connector *connector)
        /* Determine display colour depth for everything except LVDS now,
         * DP requires this before mode_valid() is called.
         */
-       if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS && nv_connector->native_mode)
+       if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS)
                nouveau_connector_detect_depth(connector);
 
        /* Find the native mode if this is a digital panel, if we didn't