Re: [PATCH v7 2/3] firmware: add Exynos ACPM protocol driver

[Markus Elfring]

…
> +++ b/drivers/firmware/samsung/exynos-acpm.c
> @@ -0,0 +1,771 @@
…
> +static int acpm_dequeue_by_polling(struct acpm_chan *achan,
> +				   const struct acpm_xfer *xfer)
> +{
…
> +	do {
> +		mutex_lock(&achan->rx_lock);
> +		ret = acpm_get_rx(achan, xfer);
> +		mutex_unlock(&achan->rx_lock);
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&achan->rx_lock);”?
https://elixir.bootlin.com/linux/v6.13.1/source/include/linux/mutex.h#L201

Regards,
Markus