linux-kernel - Re: [PATCH 01/12] thermal: of: Add error handling in devm_thermal_*

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Message-ID: <CAHp75VforxjsHWzxrxfD_YOshvg0Y=KwrpmAPWwhyarNm2wNjQ@mail.gmail.com>
Date: Fri, 5 Sep 2025 12:33:53 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Xichao Zhao <zhao.xichao@...o.com>
Cc: Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>, 
	Jonathan Cameron <jic23@...nel.org>, David Lechner <dlechner@...libre.com>, 
	Nuno Sá <nuno.sa@...log.com>, 
	Andy Shevchenko <andy@...nel.org>, Chen-Yu Tsai <wens@...e.org>, 
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Subject: Re: [PATCH 01/12] thermal: of: Add error handling in devm_thermal_*_register()

On Fri, Sep 5, 2025 at 10:25 AM Xichao Zhao <zhao.xichao@...o.com> wrote:
>
> devm_thermal_of_zone_register() does not print any error message
> when registering a thermal zone with a device node sensor fails
> and allocating device resource data fails.
>
> This forces each driver to implement redundant error logging.
> Additionally, when upper-layer functions propagate these errors
> without logging, critical debugging information is lost.
>
> Add dev_err_probe() in devm_thermal_of_zone_register() to unify
> error reporting.

...

>         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");

We do not add error messages for ENOMEM.

>                 return ERR_PTR(-ENOMEM);

Even if you want so eagerly to do that, it should be

   return dev_err_probe();

But, it will ignore the ENOMEM error code for printing.

> +       }

So, the bottom line, no need to add this message here.

...

>         tzd = thermal_of_zone_register(dev->of_node, sensor_id, data, ops);
>         if (IS_ERR(tzd)) {
> +               dev_err_probe(dev, PTR_ERR(tzd),
> +                             "Failed to register thermal zone sensor[%d]\n", sensor_id);
>                 devres_free(ptr);
>                 return tzd;

I don't see how ptr is related to the mesasge. Can't we use

  return dev_err_probe(dev, PTR_ERR(...), ...);

instead?

-- 
With Best Regards,
Andy Shevchenko