linux-kernel - Re: [PATCH v1] power: supply: bq27xxx_battery: Silence deferred-probe error

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Message-ID: <20200309230608.aur2iddomzrdw4pq@pali>
Date:   Tue, 10 Mar 2020 00:06:08 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     "Andrew F. Davis" <afd@...com>, Sebastian Reichel <sre@...nel.org>,
        David Heidelberg <david@...t.cz>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] power: supply: bq27xxx_battery: Silence
 deferred-probe error

On Monday 09 March 2020 00:51:43 Dmitry Osipenko wrote:
> The driver fails to probe with -EPROBE_DEFER if battery's power supply
> (charger driver) isn't ready yet and this results in a bit noisy error
> message in KMSG during kernel's boot up. Let's silence the harmless
> error message.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>

Hello Dmitry! This change make sense, it is really not an error when
bq27k device registration is deferred. You can add my:

Reviewed-by: Pali Rohár <pali@...nel.org>

> ---
>  drivers/power/supply/bq27xxx_battery.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
> index 195c18c2f426..664e50103eaa 100644
> --- a/drivers/power/supply/bq27xxx_battery.c
> +++ b/drivers/power/supply/bq27xxx_battery.c
> @@ -1885,7 +1885,10 @@ int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
>  
>  	di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
>  	if (IS_ERR(di->bat)) {
> -		dev_err(di->dev, "failed to register battery\n");
> +		if (PTR_ERR(di->bat) == -EPROBE_DEFER)
> +			dev_dbg(di->dev, "failed to register battery, deferring probe\n");
> +		else
> +			dev_err(di->dev, "failed to register battery\n");
>  		return PTR_ERR(di->bat);
>  	}
>