linux-kernel - Re: [PATCH 1/2] thermal/of: Add error information printing for devm_thermal_of_zone

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Date:   Thu, 13 Jul 2023 15:00:18 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Yangtao Li <frank.li@...o.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] thermal/of: Add error information printing for
 devm_thermal_of_zone_register()

On 11/07/2023 14:45, Yangtao Li wrote:
> Ensure that all error handling branches print error information. In this
> way, when this function fails, the upper-layer functions can directly
> return an error code without missing debugging information. Otherwise,
> the error message will be printed redundantly or missing.
> 
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
>   drivers/thermal/thermal_of.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
> index 6fb14e521197..8ce231f7639a 100644
> --- a/drivers/thermal/thermal_of.c
> +++ b/drivers/thermal/thermal_of.c
> @@ -583,11 +583,14 @@ struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, in
>   
>   	ptr = devres_alloc(devm_thermal_of_zone_release, sizeof(*ptr),
>   			   GFP_KERNEL);
> -	if (!ptr)
> +	if (!ptr) {
> +		dev_err(dev, "Failed to allocate device resource data\n");
>   		return ERR_PTR(-ENOMEM);
> +	}
>   
>   	tzd = thermal_of_zone_register(dev->of_node, sensor_id, data, ops);
>   	if (IS_ERR(tzd)) {
> +		dev_err(dev, "Failed to register thermal zone: %d\n", PTR_ERR(tzd));

Not sure if having this error is useful as we already have an error 
showing up with the thermal_of_zone_register() function

>   		devres_free(ptr);
>   		return tzd;
>   	}

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