linux-kernel - Re: [PATCH v2 2/2] hwmon: (dell-smm) Improve warning messages

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Date:   Mon, 29 Aug 2022 06:52:06 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Armin Wolf <W_Armin@....de>
Cc:     pali@...nel.org, jdelvare@...e.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] hwmon: (dell-smm) Improve warning messages

On Mon, Aug 22, 2022 at 07:40:53PM +0200, Armin Wolf wrote:
> When dell-smm-hwmon is loaded on a machine with a buggy BIOS
> with the option "force" being enabled, it wrongly prints
> that the buggy features where disabled. This may cause
> users to wrongly assume that the driver still protects them
> from these BIOS bugs even with "force" being enabled.
> 
> Replace the messages with two messages each which are depending
> on the value of the "force" parameter. The messages which are
> being printed when "force" is not set use dev_notice() instead
> of dev_warn() since they only serve as a notice.
> 
> Tested on a Dell Inspiron 3505.
> 
> Signed-off-by: Armin Wolf <W_Armin@....de>

Applied to hwmon-next.

Thanks,
Guenter

> ---
>  drivers/hwmon/dell-smm-hwmon.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> --
> 2.30.2
> 
> diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
> index 9cac80358072..01a94b62c2ab 100644
> --- a/drivers/hwmon/dell-smm-hwmon.c
> +++ b/drivers/hwmon/dell-smm-hwmon.c
> @@ -1356,15 +1356,21 @@ static int __init dell_smm_probe(struct platform_device *pdev)
>  	platform_set_drvdata(pdev, data);
> 
>  	if (dmi_check_system(i8k_blacklist_fan_support_dmi_table)) {
> -		dev_warn(&pdev->dev, "broken Dell BIOS detected, disallow fan support\n");
> -		if (!force)
> +		if (!force) {
> +			dev_notice(&pdev->dev, "Disabling fan support due to BIOS bugs\n");
>  			data->disallow_fan_support = true;
> +		} else {
> +			dev_warn(&pdev->dev, "Enabling fan support despite BIOS bugs\n");
> +		}
>  	}
> 
>  	if (dmi_check_system(i8k_blacklist_fan_type_dmi_table)) {
> -		dev_warn(&pdev->dev, "broken Dell BIOS detected, disallow fan type call\n");
> -		if (!force)
> +		if (!force) {
> +			dev_notice(&pdev->dev, "Disabling fan type call due to BIOS bugs\n");
>  			data->disallow_fan_type_call = true;
> +		} else {
> +			dev_warn(&pdev->dev, "Enabling fan type call despite BIOS bugs\n");
> +		}
>  	}
> 
>  	strscpy(data->bios_version, i8k_get_dmi_data(DMI_BIOS_VERSION),