linux-kernel - Re: [PATCH 4.19 79/99] ASoC: wm_adsp: Correct handling of compressed streams that restart

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Date:   Tue, 7 May 2019 14:49:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH 4.19 79/99] ASoC: wm_adsp: Correct handling of compressed
 streams that restart

On Tue, May 07, 2019 at 05:44:30PM +0900, Nobuhiro Iwamatsu wrote:
> Hi,
> 
> On Mon, May 06, 2019 at 04:32:52PM +0200, Greg Kroah-Hartman wrote:
> > From: Charles Keepax <ckeepax@...nsource.cirrus.com>
> >
> > commit 639e5eb3c7d67e407f2a71fccd95323751398f6f upstream.
> >
> > Previously support was added to allow streams to be stopped and
> > started again without the DSP being power cycled and this was done
> > by clearing the buffer state in trigger start. Another supported
> > use-case is using the DSP for a trigger event then opening the
> > compressed stream later to receive the audio, unfortunately clearing
> > the buffer state in trigger start destroys the data received
> > from such a trigger. Correct this issue by moving the call to
> > wm_adsp_buffer_clear to be in trigger stop instead.
> >
> > Fixes: 61fc060c40e6 ("ASoC: wm_adsp: Support streams which can start/stop with DSP active")
> > Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
> > Signed-off-by: Mark Brown <broonie@...nel.org>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> 
> This commit has other problems, and it is fixed by commit 43d147be5738a9ed6cfb25c285ac50d6dd5793be.
> Please apply this commit too.
> 
> commit 43d147be5738a9ed6cfb25c285ac50d6dd5793be
> Author: Charles Keepax <ckeepax@...nsource.cirrus.com>
> Date:   Tue Apr 2 13:49:14 2019 +0100
> 
>     ASoC: wm_adsp: Check for buffer in trigger stop
> 
>     Trigger stop can be called in situations where trigger start failed
>     and as such it can't be assumed the buffer is already attached to
>     the compressed stream or a NULL pointer may be dereferenced.
> 
>     Fixes: 639e5eb3c7d6 ("ASoC: wm_adsp: Correct handling of compressed streams that restart")
>     Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
>     Signed-off-by: Mark Brown <broonie@...nel.org>

Thank you, now queued up!

greg k-h