linux-kernel - Re: [PATCH 05/15] thermal: Add comment explaining test for critical temperature

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Date:	Wed, 20 May 2015 10:18:30 +0300
From:	Mikko Perttunen <mikko.perttunen@...si.fi>
To:	Sascha Hauer <s.hauer@...gutronix.de>, linux-pm@...r.kernel.org
CC:	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	linux-kernel@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>, kernel@...gutronix.de,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	Brian Norris <computersforpeace@...il.com>
Subject: Re: [PATCH 05/15] thermal: Add comment explaining test for critical
 temperature

On 05/13/15 11:52, Sascha Hauer wrote:
> The code testing if a temperature should be emulated or not is
> not obvious. Add a comment explaining why this test is done.
>
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---
>   drivers/thermal/thermal_core.c | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
> index 3e0fe55..e204deb 100644
> --- a/drivers/thermal/thermal_core.c
> +++ b/drivers/thermal/thermal_core.c
> @@ -435,6 +435,11 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
>   			}
>   		}
>
> +		/*
> +		 * Only allow emulating a temperature when the real temperature
> +		 * is below the critical temperature so that the emulation code
> +		 * cannot hide critical conditions.
> +		 */
>   		if (!ret && *temp < crit_temp)
>   			*temp = tz->emul_temperature;
>   	}
>

Reviewed-by: Mikko Perttunen <mperttunen@...dia.com>

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