linux-kernel - Re: [PATCH v1 07/17] thermal/hwmon: Use the thermal API instead tampering the internals

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Message-ID: <9ac3a59f-a3b7-4128-87d0-7b3310ce7828@linaro.org>
Date:   Mon, 20 Feb 2023 14:34:08 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, rafael@...nel.org
Subject: Re: [PATCH v1 07/17] thermal/hwmon: Use the thermal API instead
 tampering the internals

Hi Guenter,

my script should have Cc'ed you but it didn't, so just a heads up this 
patch ;)

On 19/02/2023 15:36, Daniel Lezcano wrote:
> In this function, there is a guarantee the thermal zone is registered.
> 
> The sysfs hwmon unregistering will be blocked until we exit the
> function. The thermal zone is unregistered after the sysfs hwmon is
> unregistered.
> 
> When we are in this function, the thermal zone is registered.
> 
> We can call the thermal_zone_get_crit_temp() function safely and let
> the function use the lock which is private the thermal core code.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>   drivers/thermal/thermal_hwmon.c | 10 +---------
>   1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmon.c
> index bc02095b314c..15158715b967 100644
> --- a/drivers/thermal/thermal_hwmon.c
> +++ b/drivers/thermal/thermal_hwmon.c
> @@ -77,15 +77,7 @@ temp_crit_show(struct device *dev, struct device_attribute *attr, char *buf)
>   	int temperature;
>   	int ret;
>   
> -	mutex_lock(&tz->lock);
> -
> -	if (device_is_registered(&tz->device))
> -		ret = tz->ops->get_crit_temp(tz, &temperature);
> -	else
> -		ret = -ENODEV;
> -
> -	mutex_unlock(&tz->lock);
> -
> +	ret = thermal_zone_get_crit_temp(tz, &temperature);
>   	if (ret)
>   		return ret;
>   

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