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

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Message-ID: <20160624131900.GB2503@joana>
Date:	Fri, 24 Jun 2016 10:19:00 -0300
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	Chris Wilson <chris@...is-wilson.co.uk>,
	dri-devel@...ts.freedesktop.org, marcheu@...gle.com,
	Daniel Stone <daniels@...labora.com>, seanpaul@...gle.com,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org, laurent.pinchart@...asonboard.com,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	John Harrison <John.C.Harrison@...el.com>, m.chehab@...sung.com
Subject: Re: [RFC 1/5] dma-buf/fence: add .teardown() ops

2016-06-23 Chris Wilson <chris@...is-wilson.co.uk>:

> On Thu, Jun 23, 2016 at 12:29:46PM -0300, Gustavo Padovan wrote:
> > From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> > 
> > 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.

That is much better explanation. Thanks!

	Gustavo