[PATCH 10/12] drm/i915: Allow ggtt lookups to not WARN

[Ben Widawsky <benjamin.widawsky@intel.com>]

To be able to effectively use the GGTT object lookup function, we don't
want to warn when there is no GGTT mapping. Let the caller deal with it
instead.

Originally, I had intended to have this behavior, and has not
introduced the WARN. It was introduced during review with the addition
of the follow commit

commit 5c2abbeab798154166d42fce4f71790caa6dd9bc
Author: Ben Widawsky <benjamin.widawsky@intel.com>
Date:   Tue Sep 24 09:57:57 2013 -0700

    drm/i915: Provide a cheap ggtt vma lookup

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index bc5c865..6388706 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5069,7 +5069,7 @@ struct i915_vma *i915_gem_obj_to_ggtt(struct drm_i915_gem_object *obj)
 		return NULL;
 
 	vma = list_first_entry(&obj->vma_list, typeof(*vma), vma_link);
-	if (WARN_ON(vma->vm != obj_to_ggtt(obj)))
+	if (vma->vm != obj_to_ggtt(obj))
 		return NULL;
 
 	return vma;
-- 
1.8.4.2