linux-kernel - Re: [PATCH v2 4/4] ASoC: apple: mca: Add locks on foreign cluster access

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Message-ID: <YwPAtY1kp5tU/isF@sirena.org.uk>
Date:   Mon, 22 Aug 2022 18:45:25 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Martin Povišer <povik+lin@...ebit.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        asahi@...ts.linux.dev, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] ASoC: apple: mca: Add locks on foreign cluster
 access

On Fri, Aug 19, 2022 at 02:54:30PM +0200, Martin Povišer wrote:
> In DAI ops, accesses to the native cluster (of the DAI), and to data of
> clusters related to it by a DPCM frontend-backend link, should have
> been synchronized by the 'pcm_mutex' lock at ASoC level.
> 
> What is not covered are the 'port_driver' accesses on foreign clusters
> to which the current cluster has no a priori relation, so fill in
> locking for that. (This should only matter in bizarre configurations of
> sharing one MCA peripheral between ASoC cards.)

This also looks good.

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