linux-kernel - Re: [PATCH 02/14] thermal: exynos: Propagate error value from tmu

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Date:   Mon, 16 Apr 2018 14:16:56 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Eduardo Valentin <edubezval@...il.com>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCH 02/14] thermal: exynos: Propagate error value from
 tmu_read()

On 16/04/2018 12:11, Bartlomiej Zolnierkiewicz wrote:
> From: Marek Szyprowski <m.szyprowski@...sung.com>
> 
> tmu_read() in case of Exynos4210 might return error for out of bound
> values. Current code ignores such value, what leads to reporting critical
> temperature value. Add proper error code propagation to exynos_get_temp()
> function.

For me the comment in the function exynos4210_tmu_read

/* "temp_code" should range between 75 and 175 */

... is strange. I would double check this assertion before dealing with
the error value.

> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> CC: stable@...r.kernel.org # v4.6+
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> ---
>  drivers/thermal/samsung/exynos_tmu.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 986cbd0..ac83f72 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -892,6 +892,7 @@ static void exynos7_tmu_control(struct platform_device *pdev, bool on)
>  static int exynos_get_temp(void *p, int *temp)
>  {
>  	struct exynos_tmu_data *data = p;
> +	int value, ret = 0;
>  
>  	if (!data || !data->tmu_read || !data->enabled)
>  		return -EINVAL;
> @@ -899,12 +900,16 @@ static int exynos_get_temp(void *p, int *temp)
>  	mutex_lock(&data->lock);
>  	clk_enable(data->clk);
>  
> -	*temp = code_to_temp(data, data->tmu_read(data)) * MCELSIUS;
> +	value = data->tmu_read(data);
> +	if (value < 0)
> +		ret = value;
> +	else
> +		*temp = code_to_temp(data, value) * MCELSIUS;
>  
>  	clk_disable(data->clk);
>  	mutex_unlock(&data->lock);
>  
> -	return 0;
> +	return ret;
>  }
>  
>  #ifdef CONFIG_THERMAL_EMULATION
> 


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