linux-kernel - Re: [PATCH 0/4] dmaengine: Add transfer termination synchronization support

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Date:	Thu, 29 Oct 2015 10:26:50 +0900
From:	Vinod Koul <vinod.koul@...el.com>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Takashi Iwai <tiwai@...e.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Laurent Pinchart <renesas@...asonboard.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Qiao Zhou <zhouqiao@...vell.com>,
	Shengjiu Wang <shengjiu.wang@...escale.com>,
	Matt Campbell <mcampbell@...tope.com>,
	Jonah Petri <jpetri@...tope.com>, dmaengine@...r.kernel.org,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] dmaengine: Add transfer termination synchronization
 support

On Tue, Oct 20, 2015 at 11:46:27AM +0200, Lars-Peter Clausen wrote:
> The DMAengine API has a long standing issue that is inherent to the API
> itself. For a client that calls dmaengine_terminate_all() it is not
> possible to properly synchronize the completion of any currently running
> complete callbacks to the current context. This means it is possible to end
> up with a use-after-free race condition if client frees resources that are
> accessed in a complete callback before the complete callback has finished
> running.
> 
> This patch series introduces a new explicit synchronization primitive to
> the DMAengine API which allows clients to ensure that all complete
> callbacks have finished running. This allows them to safely free any
> resources that might be accessed in a complete callback.
> 
> The series for now only implements synchronization support for a single
> driver and only updates single client to make use of the new API. If there
> is agreement on the general approach more will follow.

Thanks Lars for getting this done.

I have merged this to topic/test/async branch and this will be in next
kernel revision. We are too close to merge window right now

-- 
~Vinod
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