drm/i915/display: stop returning errors from debugfs registration

Failures to register debugfs should be ignored anyway, so stop
propagating errors altogether for clarity and simplicity. No functional
changes.
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/346562ccef2282ccdbdea54409fab1d2b48f313c.1630327990.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_display_debugfs.c

@@ -2442,17 +2442,15 @@ static const struct file_operations i915_dsc_bpp_fops = {
  *
  * Cleanup will be done by drm_connector_unregister() through a call to
  * drm_debugfs_connector_remove().
- *
- * Returns 0 on success, negative error codes on error.
  */
-int intel_connector_debugfs_add(struct drm_connector *connector)
+void intel_connector_debugfs_add(struct drm_connector *connector)
 {
 	struct dentry *root = connector->debugfs_entry;
 	struct drm_i915_private *dev_priv = to_i915(connector->dev);
 
 	/* The connector must have been registered beforehands. */
 	if (!root)
-		return -ENODEV;
+		return;
 
 	if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) {
 		debugfs_create_file("i915_panel_timings", S_IRUGO, root,
@@ -2492,23 +2490,16 @@ int intel_connector_debugfs_add(struct drm_connector *connector)
 	    connector->connector_type == DRM_MODE_CONNECTOR_HDMIB)
 		debugfs_create_file("i915_lpsp_capability", 0444, root,
 				    connector, &i915_lpsp_capability_fops);
-
-	return 0;
 }
 
 /**
  * intel_crtc_debugfs_add - add i915 specific crtc debugfs files
  * @crtc: pointer to a drm_crtc
  *
- * Returns 0 on success, negative error codes on error.
- *
  * Failure to add debugfs entries should generally be ignored.
  */
-int intel_crtc_debugfs_add(struct drm_crtc *crtc)
+void intel_crtc_debugfs_add(struct drm_crtc *crtc)
 {
-	if (!crtc->debugfs_entry)
-		return -ENODEV;
-
-	crtc_updates_add(crtc);
-	return 0;
+	if (crtc->debugfs_entry)
+		crtc_updates_add(crtc);
 }

drivers/gpu/drm/i915/display/intel_display_debugfs.h

@@ -12,12 +12,12 @@ struct drm_i915_private;
 
 #ifdef CONFIG_DEBUG_FS
 void intel_display_debugfs_register(struct drm_i915_private *i915);
-int intel_connector_debugfs_add(struct drm_connector *connector);
-int intel_crtc_debugfs_add(struct drm_crtc *crtc);
+void intel_connector_debugfs_add(struct drm_connector *connector);
+void intel_crtc_debugfs_add(struct drm_crtc *crtc);
 #else
 static inline void intel_display_debugfs_register(struct drm_i915_private *i915) {}
-static inline int intel_connector_debugfs_add(struct drm_connector *connector) { return 0; }
-static inline int intel_crtc_debugfs_add(struct drm_crtc *crtc) { return 0; }
+static inline void intel_connector_debugfs_add(struct drm_connector *connector) {}
+static inline void intel_crtc_debugfs_add(struct drm_crtc *crtc) {}
 #endif
 
 #endif /* __INTEL_DISPLAY_DEBUGFS_H__ */