[PATCH] ASoC: atmel: mchp-pdmc: Skip ALSA restoration if substream runtime is uninitialized

[Mark Brown]

On Tue, Sep 24, 2024 at 11:12:38AM +0300, Andrei Simion wrote:

> Update the driver to prevent alsa-restore.service from failing when
> reading data from /var/lib/alsa/asound.state at boot. Ensure that the
> restoration of ALSA mixer configurations is skipped if substream->runtime
> is NULL.

> +++ b/sound/soc/atmel/mchp-pdmc.c
> @@ -302,6 +302,9 @@ static int mchp_pdmc_chmap_ctl_put(struct snd_kcontrol *kcontrol,
>  	if (!substream)
>  		return -ENODEV;
>  
> +	if (!substream->runtime)
> +		return 0; /* just for avoiding error from alsactl restore */
> +

This then means that control writes are just discarded which presumably
is going to upset things if they actually saved a value here.  Why is
that a good choice, rather than either fixing the race so the card
doesn't come up too early or removing the need for the runtime?
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