[PATCH] drm: should return upon the best size(v3)

[Chris Wilson]

Quoting Monk Liu (2018-11-27 03:10:34)
> v2:
> amend description:
> for RB tree traveler we don't need to travel to
> the bottom level if already found the equal size node,
> thus the search performance can get improved.
> 
> v3:
> split "<=" to "<" case and "==" case
> 
> Tested-by: Rex Zhu <Rex.zhu at amd.com>
> Signed-off-by: Monk Liu <Monk.Liu at amd.com>

Still fundamentally broken.
-Chris