linux-kernel - Re: [PATCH v2 3/5] ASoC: rt5640: Fix sleep in atomic context

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Message-ID: <550e5c8f-0bfb-4ffc-9a43-1ecb153c6a02@sirena.org.uk>
Date:   Thu, 29 Jun 2023 11:11:23 +0100
From:   Mark Brown <broonie@...nel.org>
To:     David Laight <David.Laight@...lab.com>
Cc:     'Sameer Pujar' <spujar@...dia.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "perex@...ex.cz" <perex@...ex.cz>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "jonathanh@...dia.com" <jonathanh@...dia.com>,
        "mkumard@...dia.com" <mkumard@...dia.com>,
        "sheetal@...dia.com" <sheetal@...dia.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Oder Chiou <oder_chiou@...ltek.com>
Subject: Re: [PATCH v2 3/5] ASoC: rt5640: Fix sleep in atomic context

On Thu, Jun 29, 2023 at 08:38:09AM +0000, David Laight wrote:
> From: Sameer Pujar

> > Following prints are observed while testing audio on Jetson AGX Orin which
> > has onboard RT5640 audio codec:
> > 
> >   BUG: sleeping function called from invalid context at kernel/workqueue.c:3027
> >   in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 0, name: swapper/0

> My 'gut feel' is that this will just move the problem elsewhere.

> If the ISR is responsible for adding audio buffers (etc) then it is
> also not unlikely that the scheduling delays in running a threaded ISR
> will cause audio glitches if the system is busy.

What makes you think this is anything to do with audio glitches?  The
bug is literally what is described, it is not valid to sleep in atomic
contexts and if we ever actually try things are likely to go badly.

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