linux-kernel - Re: [PATCH 2/4] thermal/of: Return -ENODEV instead of -EINVAL if registration fails

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Date:   Mon, 8 Aug 2022 11:35:34 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>, rafael@...nel.org
Cc:     michael@...le.cc, dan.carpenter@...cle.com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH 2/4] thermal/of: Return -ENODEV instead of -EINVAL if
 registration fails

On 8/8/22 11:09, Daniel Lezcano wrote:
> The previous version of the OF code was returning -ENODEV if no
> thermal zones description was found or if the lookup of the sensor in
> the thermal zones was not found.
> 
> The backend drivers are expecting this return value as an information
> about skipping the sensor initialization and considered as normal.
> 
> Fix the return value by replacing -EINVAL by -ENODEV
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>   drivers/thermal/thermal_of.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
> index 368eb58e97cf..4210c18ef7b2 100644
> --- a/drivers/thermal/thermal_of.c
> +++ b/drivers/thermal/thermal_of.c
> @@ -329,7 +329,7 @@ static struct device_node *of_thermal_zone_find(struct device_node *sensor, int
>   	np = of_find_node_by_name(NULL, "thermal-zones");
>   	if (!np) {
>   		pr_err("Unable to find thermal zones description\n");

I really don't like that error message: People will see it (and complain)
whenever a sensor registers and there is no thermal zone, even though that
is perfectly normal (see description above).

Guenter

> -		return ERR_PTR(-EINVAL);
> +		return ERR_PTR(-ENODEV);
>   	}
>   
>   	/*
> @@ -368,7 +368,7 @@ static struct device_node *of_thermal_zone_find(struct device_node *sensor, int
>   			}
>   		}
>   	}
> -	tz = ERR_PTR(-EINVAL);
> +	tz = ERR_PTR(-ENODEV);
>   out:
>   	of_node_put(np);
>   	return tz;