linux-kernel - Re: [PATCH 2/3] dma-buf/sync_file: add sync_file_get

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Date:	Mon, 13 Jun 2016 18:21:24 -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: [PATCH 2/3] dma-buf/sync_file: add sync_file_get_fence()

2016-06-10 Chris Wilson <chris@...is-wilson.co.uk>:

> On Thu, Jun 09, 2016 at 12:05:29PM -0300, Gustavo Padovan wrote:
> > From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> > 
> > Creates a function that given an sync file descriptor returns a
> > fence_collection containing all fences in the sync_file.
> > 
> > If there is only one fence in the sync_file this fence itself is returned,
> > however if there is more than one, a fence_collection fence is returned.
> > 
> > v2: Comments by Daniel Vetter
> > 	- Adapt to new version of fence_collection_init()
> > 	- Hold a reference for the fence we return
> > 
> > v3:     - Adapt to use fput() directly
> > 	- rename to sync_file_get_fence() as we always return one fence
> > 
> > v4: Adapt to use fence_array
> 
> The sync_file looks just like a fence_array plus struct file integration.
> Is there a good reason why we cannot just use fence_array here?

I think the only reason is because I haven't thought about this before.
If we add proper support to fence_array we can make sync_files even
simpler.

	Gustavo