Re: [PATCH v3 2/2] ASoC: codecs: add TAS2557 mono smart amplifier driver

[Markus Elfring]

…
> +++ b/sound/soc/codecs/tas2557.c
> @@ -0,0 +1,3067 @@
…
> +static int tas2557_dev_read(struct tas2557_priv *tas2557, unsigned int chn,
> +			    unsigned int reg, unsigned int *value)
> +{
…
> +	mutex_lock(&tas2557->dev_lock);
> +	ret = tas2557_change_book_page(tas2557, chn, TAS2557_BOOK_ID(reg),
> +				       TAS2557_PAGE_ID(reg));
…
> +	mutex_unlock(&tas2557->dev_lock);
> +	return ret;
> +}
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&tas2557->dev_lock);”?
https://elixir.bootlin.com/linux/v7.2-rc3/source/include/linux/mutex.h#L253

Regards,
Markus