linux-kernel - Re: [PATCH] hwmon: (asus-ec-sensors) do not print from .probe()

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Date:   Thu, 17 Feb 2022 10:26:42 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Eugene Shalygin <eugene.shalygin@...il.com>
Cc:     Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (asus-ec-sensors) do not print from .probe()

On 2/16/22 23:23, Eugene Shalygin wrote:
> Remove the call to dev_info() from the board detection function, which
> is called from probe(), not only to be in line with hwmon driver rules, but
> also because the message duplicates the error code returned from probe()
> for that case (ENODEV).
> 
> Signed-off-by: Eugene Shalygin <eugene.shalygin@...il.com>
> ---
>   drivers/hwmon/asus-ec-sensors.c | 17 +++++------------
>   1 file changed, 5 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/hwmon/asus-ec-sensors.c b/drivers/hwmon/asus-ec-sensors.c
> index 0701ade16227..cbe1b987144a 100644
> --- a/drivers/hwmon/asus-ec-sensors.c
> +++ b/drivers/hwmon/asus-ec-sensors.c
> @@ -597,18 +597,11 @@ static struct hwmon_chip_info asus_ec_chip_info = {
>   	.ops = &asus_ec_hwmon_ops,
>   };
>   
> -static unsigned long __init
> -get_board_sensors(const struct device *dev)
> +static unsigned long __init get_board_sensors(void)
>   {
> -	const struct dmi_system_id *dmi_entry;
> -
> -	dmi_entry = dmi_first_match(asus_ec_dmi_table);
> -	if (!dmi_entry) {
> -		dev_info(dev, "Unsupported board");
> -		return 0;
> -	}
> -
> -	return (unsigned long)dmi_entry->driver_data;
> +	const struct dmi_system_id *dmi_entry =
> +		dmi_first_match(asus_ec_dmi_table);
> +	return dmi_entry ? (unsigned long)dmi_entry->driver_data : 0;

Looks like you did not run checkpatch.

Either case, I think you should just drop this function In probe:

	const struct dmi_system_id *dmi_entry = dmi_first_match(asus_ec_dmi_table);

	...
	if (!dmi_entry)
		return -ENODEV;
	...
	ec_data->board_sensors = (unsigned long)dmi_entry->driver_data;

Guenter

>   }
>   
>   static int __init asus_ec_probe(struct platform_device *pdev)
> @@ -625,7 +618,7 @@ static int __init asus_ec_probe(struct platform_device *pdev)
>   	struct device *hwdev;
>   	unsigned int i;
>   
> -	board_sensors = get_board_sensors(dev);
> +	board_sensors = get_board_sensors();
>   	if (!board_sensors)
>   		return -ENODEV;
>