From b0ff4b93f646c39900ead9f6f7b6da78b5978273 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Mon, 24 Nov 2014 20:01:58 +0100
Subject: drm: Document that drm_dev_alloc doesn't need a parent

Possible for purely virtual debug devices.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 2e5c7d9..4f41377 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -535,6 +535,8 @@ static void drm_fs_inode_free(struct inode *inode)
  * The initial ref-count of the object is 1. Use drm_dev_ref() and
  * drm_dev_unref() to take and drop further ref-counts.
  *
+ * Note that for purely virtual devices @parent can be NULL.
+ *
  * RETURNS:
  * Pointer to new DRM device, or NULL if out of memory.
  */
-- 
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