[PATCH] dma-buf/dma-fence: improve doc for dma_fence_add_callback()

[Chris Wilson]

On Wed, Feb 15, 2017 at 03:57:25PM -0200, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan at collabora.com>
> 
> Document return values for this function.
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan at collabora.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre