linux-kernel - Re: [PATCH v2 11/12] thermal: core: allow user configuration of hardware protection action

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Message-ID: <Z433eMTJvHy1JlpB@google.com>
Date: Mon, 20 Jan 2025 07:12:56 +0000
From: Tzung-Bi Shih <tzungbi@...nel.org>
To: Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Fabio Estevam <festevam@...x.de>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>,
	Jonathan Corbet <corbet@....net>, Serge Hallyn <serge@...lyn.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	Benson Leung <bleung@...omium.org>,
	Guenter Roeck <groeck@...omium.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	chrome-platform@...ts.linux.dev, devicetree@...r.kernel.org,
	kernel@...gutronix.de
Subject: Re: [PATCH v2 11/12] thermal: core: allow user configuration of
 hardware protection action

On Mon, Jan 13, 2025 at 05:25:36PM +0100, Ahmad Fatoum wrote:
> In the general case, we don't know which of system shutdown or
> reboot is the better action to take to protect hardware in an emergency
> situation. We thus allow the policy to come from the device-tree in the
> form of an optional critical-action OF property, but so far there was no
> way for the end user to configure this.
> 
> With recent addition of the hw_protection parameter, the user can now
> choose a default action for the case, where the driver isn't fully sure
> what's the better course of action.
> 
> Let's make use of this by passing HWPROT_ACT_DEFAULT in absence of the
> critical-action OF property.
> 
> As HWPROT_ACT_DEFAULT is shutdown by default, this introduces no
> functional change for users, unless they start using the new parameter.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>

Reviewed-by: Tzung-Bi Shih <tzungbi@...nel.org>