linux-kernel - Re: [PATCH 2/5] platform: arm64: add Huawei Matebook E Go (sc8280xp) EC driver

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Message-ID: <b55886e2-9a21-4903-b344-2dccb359bcbc@web.de>
Date: Sun, 29 Dec 2024 15:49:01 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Pengyu Luo <mitltlatltl@...il.com>, platform-driver-x86@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-usb@...r.kernel.org, linux-pm@...r.kernel.org,
 Bjorn Andersson <andersson@...nel.org>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Hans de Goede <hdegoede@...hat.com>,
 Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Konrad Dybcio <konradybcio@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
 Sebastian Reichel <sre@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Nikita Travkin <nikita@...n.ru>
Subject: Re: [PATCH 2/5] platform: arm64: add Huawei Matebook E Go (sc8280xp)
 EC driver

…
> +++ b/drivers/platform/arm64/huawei-gaokun-ec.c
> @@ -0,0 +1,598 @@
…
> +static int gaokun_ec_request(struct gaokun_ec *ec, const u8 *req,
> +			     size_t resp_len, u8 *resp)
> +{
…
> +	mutex_lock(&ec->lock);
> +
> +	i2c_transfer(client->adapter, msgs, 2);
> +	usleep_range(2000, 2500);
> +
> +	mutex_unlock(&ec->lock);
> +
> +	return *resp;
> +}
…

Under which circumstances would you become interested to apply a statement
like “guard(mutex)(&ec->lock);”?
https://elixir.bootlin.com/linux/v6.13-rc3/source/include/linux/mutex.h#L201

Regards,
Markus