linux-kernel - Re: [PATCH v2] gpio: dwapb: Don't print error on -EPROBE

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Message-ID: <YqMnb9FjSuU6xd+n@smile.fi.intel.com>
Date:   Fri, 10 Jun 2022 14:13:51 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Hoan Tran <hoan@...amperecomputing.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] gpio: dwapb: Don't print error on -EPROBE_DEFER

On Fri, Jun 10, 2022 at 01:45:00PM +0300, Serge Semin wrote:
> Currently if the APB or Debounce clocks aren't yet ready to be requested
> the DW GPIO driver will correctly handle that by deferring the probe
> procedure, but the error is still printed to the system log. It needlessly
> pollutes the log since there was no real error but a request to postpone
> the clock request procedure since the clocks subsystem hasn't been fully
> initialized yet. Let's fix that by using the dev_err_probe method to print
> the APB/clock request error status. It will correctly handle the deferred
> probe situation and print the error if it actually happens.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>

With or without below nit-pick
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> ---
> 
> Link: https://lore.kernel.org/linux-gpio/20220610075152.10214-1-Sergey.Semin@baikalelectronics.ru/
> Changelog v2:
> - Use the dev_err_probe() return value as the return status of the
>   corresponding method. (@Philipp Zabel)
> ---
>  drivers/gpio/gpio-dwapb.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
> index b0f3aca61974..9467d695a33e 100644
> --- a/drivers/gpio/gpio-dwapb.c
> +++ b/drivers/gpio/gpio-dwapb.c
> @@ -652,10 +652,9 @@ static int dwapb_get_clks(struct dwapb_gpio *gpio)
>  	gpio->clks[1].id = "db";
>  	err = devm_clk_bulk_get_optional(gpio->dev, DWAPB_NR_CLOCKS,
>  					 gpio->clks);
> -	if (err) {
> -		dev_err(gpio->dev, "Cannot get APB/Debounce clocks\n");
> -		return err;
> -	}
> +	if (err)
> +		return dev_err_probe(gpio->dev, err,
> +				     "Cannot get APB/Debounce clocks\n");

I would leave it on one line, checkpatch wouldn't complain even before 100
characters era.

>  
>  	err = clk_bulk_prepare_enable(DWAPB_NR_CLOCKS, gpio->clks);
>  	if (err) {
> -- 
> 2.35.1
> 

-- 
With Best Regards,
Andy Shevchenko