linux-kernel - Re: [PATCH] ASoC: soc-pcm: add a check for unsupported commands to the soc_pcm

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Message-ID: <dff13df4-39c4-4995-b7cf-f9240a970cbc@sirena.org.uk>
Date: Tue, 12 Mar 2024 14:31:37 +0000
From: Mark Brown <broonie@...nel.org>
To: xuhanwu <2433926602@...com>
Cc: lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
	linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org,
	xuhanwu <xu.hanwu@...lec.com>
Subject: Re: [PATCH] ASoC: soc-pcm: add a check for unsupported commands to
 the soc_pcm_trigger

On Mon, Mar 11, 2024 at 03:05:48PM +0800, xuhanwu wrote:

> >	As can be seen from inspection of the immediately
> >	preceeding handling of start, we're deliberately
> >        ignoring half the values in each switch.

> In kernel version 6.2, when the soc_pcm_trigger function receives a
> command parameter cmd set to SNDRV_PCM_TRIGGER_DRAIN,
> it returns a value of -EINVAL.The function snd_pcm_drain checks
> the returned error value and exits accordingly.

The current kernel version is v6.8 (we're in the merge window for v6.9
now) - any changes that you're submitting should be submitted against
current code, not v6.2.

> In the latest code, when the cmd parameter is set to SNDRV_PCM_TRIGGER_DRAIN,
> the return value is 0. If snd_pcm_drain finds that the return value is 0,
> it will not execute the goto unlock;

Well, it will get to the unlock eventually after going through the for
loop so the lock doesn't get leaked AFAICT?  I'm not sure what the issue
you're seeing here is.

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