drm: Restrict drm_mode_set_config_internal to non-atomic drivers

This is another case where we really can't reconstruct a acquire ctx
in any useful fashion because all the callers are legacy drivers. So
like drm_plane_force_disable simply restrict it to non-atomic drivers
so that it's clear we're ok with passing a NULL ctx.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170322215058.8671-17-daniel.vetter@ffwll.ch

1 files changed, 21 insertions, 13 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 55b3da2e2a82..685bf146a482 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -447,18 +447,7 @@ int drm_mode_getcrtc(struct drm_device *dev,
         return 0;
 }
 
-/**
- * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
- * @set: modeset config to set
- *
- * This is a little helper to wrap internal calls to the
- * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
- * correct refcounting dance.
- *
- * Returns:
- * Zero on success, negative errno on failure.
- */
-int drm_mode_set_config_internal(struct drm_mode_set *set)
+static int __drm_mode_set_config_internal(struct drm_mode_set *set)
 {
         struct drm_crtc *crtc = set->crtc;
         struct drm_framebuffer *fb;
@@ -491,6 +480,25 @@ int drm_mode_set_config_internal(struct drm_mode_set *set)
 
         return ret;
 }
+/**
+ * drm_mode_set_config_internal - helper to call &drm_mode_config_funcs.set_config
+ * @set: modeset config to set
+ *
+ * This is a little helper to wrap internal calls to the
+ * &drm_mode_config_funcs.set_config driver interface. The only thing it adds is
+ * correct refcounting dance.
+ *
+ * This should only be used by non-atomic legacy drivers.
+ *
+ * Returns:
+ * Zero on success, negative errno on failure.
+ */
+int drm_mode_set_config_internal(struct drm_mode_set *set)
+{
+        WARN_ON(drm_drv_uses_atomic_modeset(set->crtc->dev));
+
+        return __drm_mode_set_config_internal(set);
+}
 EXPORT_SYMBOL(drm_mode_set_config_internal);
 
 /**
@@ -688,7 +696,7 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
         set.connectors = connector_set;
         set.num_connectors = crtc_req->count_connectors;
         set.fb = fb;
-        ret = drm_mode_set_config_internal(&set);
+        ret = __drm_mode_set_config_internal(&set);
 
 out:
         if (fb)