linux-kernel - Re: [RESEND 1/9] thermal/hwmon: Add error information printing for devm_thermal_add_hwmon

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Message-ID: <16e72927-b3b0-7191-e05c-74acb5a77859@linaro.org>
Date:   Tue, 13 Jun 2023 12:19:12 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Yangtao Li <frank.li@...o.com>, glaroque@...libre.com,
        rafael@...nel.org, amitk@...nel.org, rui.zhang@...el.com,
        shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, thara.gopinath@...il.com,
        agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        anarsoul@...il.com, tiny.windzz@...il.com, wens@...e.org,
        jernej.skrabec@...il.com, samuel@...lland.org,
        thierry.reding@...il.com, jonathanh@...dia.com,
        edubezval@...il.com, j-keerthy@...com, f.fainelli@...il.com
Cc:     linux-pm@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-sunxi@...ts.linux.dev,
        linux-tegra@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [RESEND 1/9] thermal/hwmon: Add error information printing for
 devm_thermal_add_hwmon_sysfs()

On 13/06/2023 11:56, 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>
> ---
> Resend patchset so that the changes to thermal/hwmon.c are copied to everyone.
>   drivers/thermal/thermal_hwmon.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmon.c
> index fbe55509e307..a580add5a2f6 100644
> --- a/drivers/thermal/thermal_hwmon.c
> +++ b/drivers/thermal/thermal_hwmon.c
> @@ -271,11 +271,14 @@ int devm_thermal_add_hwmon_sysfs(struct device *dev, struct thermal_zone_device
>   
>   	ptr = devres_alloc(devm_thermal_hwmon_release, sizeof(*ptr),
>   			   GFP_KERNEL);
> -	if (!ptr)
> +	if (!ptr) {
> +		dev_err(dev, "Failed to allocate device resource data\n");
>   		return -ENOMEM;
> +	}

When an allocation fails, there is a callstack showed. It is not 
necessary to print an error in this case.

>   
>   	ret = thermal_add_hwmon_sysfs(tz);
>   	if (ret) {
> +		dev_err(dev, "Failed to add hwmon sysfs attributes\n");
>   		devres_free(ptr);
>   		return ret;
>   	}

That should not display an error. The call site will take care of that.

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