[RFC PATCH 29/37] drm: mode: Add drm_mode_reference

[Daniel Stone <daniels@collabora.com>]

Does what it says on the box.

Signed-off-by: Daniel Stone <daniels@collabora.com>
---
 drivers/gpu/drm/drm_crtc.c  | 13 +++++++++++++
 drivers/gpu/drm/drm_modes.c |  8 ++++++++
 include/drm/drm_modes.h     |  1 +
 3 files changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 90bf355..3ef0332 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -4382,6 +4382,17 @@ bool drm_property_change_valid_get(struct drm_property *property,
 			} else {
 				return false;
 			}
+		} else if (property->values[0] == DRM_MODE_OBJECT_MODE) {
+			struct drm_display_mode *mode;
+			mode = drm_mode_find(property->dev, value);
+			if (mode) {
+				drm_mode_reference(mode);
+				*ref = &mode->base;
+				return true;
+			} else {
+				return false;
+			}
+
 		} else {
 			return _object_find(property->dev, value, property->values[0]) != NULL;
 		}
@@ -4402,6 +4413,8 @@ void drm_property_change_valid_put(struct drm_property *property,
 	if (drm_property_type_is(property, DRM_MODE_PROP_OBJECT)) {
 		if (property->values[0] == DRM_MODE_OBJECT_FB)
 			drm_framebuffer_unreference(obj_to_fb(ref));
+		else if (property->values[0] == DRM_MODE_OBJECT_MODE)
+			drm_mode_destroy(property->dev, obj_to_mode(ref));
 	}
 }
 
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index e87f547..86bb5c1 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -123,6 +123,13 @@ void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
 }
 EXPORT_SYMBOL(drm_mode_destroy);
 
+struct drm_display_mode *drm_mode_reference(struct drm_display_mode *mode)
+{
+	kref_get(&mode->refcount);
+	return mode;
+}
+EXPORT_SYMBOL(drm_mode_reference);
+
 /**
  * drm_mode_probed_add - add a mode to a connector's probed_mode list
  * @connector: connector the new mode
@@ -881,6 +888,7 @@ void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *
 
 	*dst = *src;
 	dst->refcount = refcount;
+	dst->base.type = DRM_MODE_OBJECT_MODE;
 	dst->base.id = id;
 	dst->head = head;
 }
diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index 70a6c71..a8aaf4b 100644
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -188,6 +188,7 @@ struct drm_connector;
 struct drm_cmdline_mode;
 
 struct drm_display_mode *drm_mode_create(struct drm_device *dev);
+struct drm_display_mode *drm_mode_reference(struct drm_display_mode *mode);
 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode);
 void drm_mode_probed_add(struct drm_connector *connector, struct drm_display_mode *mode);
 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode);
-- 
2.3.2

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