linux-kernel - Re: [PATCH 0/4] dmaengine redux continued

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Message-ID: <e9c3a7c20812041052l7fa7c148jf0a40318a2fe8cf4@mail.gmail.com>
Date:	Thu, 4 Dec 2008 11:52:28 -0700
From:	"Dan Williams" <dan.j.williams@...el.com>
To:	"Guennadi Liakhovetski" <g.liakhovetski@....de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] dmaengine redux continued

On Thu, Dec 4, 2008 at 1:51 AM, Guennadi Liakhovetski
<g.liakhovetski@....de> wrote:
> What about the last hunk from the patch at
>
> http://marc.info/?l=linux-arm-kernel&m=122607472721145&w=2
>
> ? Can we add this tx_free pointer? Would you like me to submit it as a
> separate patch? I'd like to be able to reuse tx-descriptors in clients, so
> I then have to explicitly release them in the dmaengine device
> (controller) driver.
>

I took a look but the description does not explain why the driver
needs an explicit release.  In what cases is the implied release, when
the descriptor is acked && done, insufficient?
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