Re: [RFC 1/5] dma-buf/fence: add .teardown() ops

[Chris Wilson]

On Thu, Jun 23, 2016 at 12:29:46PM -0300, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
> 
> fence_array requires a function to clean up its state before we
> are able to call fence_put() and release it.

An explanation along the lines of:

As the array of fence callbacks held by an active struct fence_array
each has a reference to the struct fence_array, when the owner of the
fence_array is freed it must dispose of the callback references before
it can free the fence_array. This can not happen simply during
fence_release() because of the extra references and so we need a new
function to run before the final fence_put().

would help, it is not until you use it in 5/5 that it becomes apparent
why it is needed.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre