1 files changed, 23 insertions, 5 deletions

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 7ff13bc47ca..b7adb4a967f 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -714,6 +714,27 @@ EXPORT_SYMBOL(drm_mode_set_crtcinfo);
 
 
 /**
+ * drm_mode_copy - copy the mode
+ * @dst: mode to overwrite
+ * @src: mode to copy
+ *
+ * LOCKING:
+ * None.
+ *
+ * Copy an existing mode into another mode, preserving the object id
+ * of the destination mode.
+ */
+void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
+{
+        int id = dst->base.id;
+
+        *dst = *src;
+        dst->base.id = id;
+        INIT_LIST_HEAD(&dst->head);
+}
+EXPORT_SYMBOL(drm_mode_copy);
+
+/**
  * drm_mode_duplicate - allocate and duplicate an existing mode
  * @m: mode to duplicate
  *
@@ -727,16 +748,13 @@ struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
                                             const struct drm_display_mode *mode)
 {
         struct drm_display_mode *nmode;
-        int new_id;
 
         nmode = drm_mode_create(dev);
         if (!nmode)
                 return NULL;
 
-        new_id = nmode->base.id;
-        *nmode = *mode;
-        nmode->base.id = new_id;
-        INIT_LIST_HEAD(&nmode->head);
+        drm_mode_copy(nmode, mode);
+
         return nmode;
 }
 EXPORT_SYMBOL(drm_mode_duplicate);