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

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Message-ID: <e1fffd3b-d3dd-4f46-b7b6-1f03f934dd30@web.de>
Date: Sat, 8 Feb 2025 16:31:00 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org,
 Alim Akhtar <alim.akhtar@...sung.com>, Conor Dooley <conor+dt@...nel.org>,
 Jassi Brar <jassisinghbrar@...il.com>, Krzysztof Kozlowski <krzk@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, kernel-team@...roid.com,
 André Draszik <andre.draszik@...aro.org>,
 Arnd Bergmann <arnd@...db.de>, Daniel Lezcano <daniel.lezcano@...aro.org>,
 Peter Griffin <peter.griffin@...aro.org>, Rob Herring <robh@...nel.org>,
 Ulf Hansson <ulf.hansson@...aro.org>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Will McVicker <willmcvicker@...gle.com>
Subject: Re: [PATCH v7 2/3] firmware: add Exynos ACPM protocol driver

…
> +++ 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