linux-kernel - Re: [PATCH 1/2] platform/x86: GPD pocket fan: Use default values when wrong modparams are given

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Date:   Wed, 8 Jan 2020 14:23:53 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stable <stable@...r.kernel.org>,
        Jason Anderson <jasona.594@...il.com>
Subject: Re: [PATCH 1/2] platform/x86: GPD pocket fan: Use default values when
 wrong modparams are given

On Mon, Jan 6, 2020 at 4:42 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Use our default values when wrong module-parameters are given, instead of
> refusing to load. Refusing to load leaves the fan at the BIOS default
> setting, which is "Off". The CPU's thermal throttling should protect the
> system from damage, but not-loading is really not the best fallback in this
> case.
>
> This commit fixes this by re-setting module-parameter values to their
> defaults if they are out of range, instead of failing the probe with
> -EINVAL.
>
> Cc: stable@...r.kernel.org
> Cc: Jason Anderson <jasona.594@...il.com>
> Reported-by: Jason Anderson <jasona.594@...il.com>
> Fixes: 594ce6db326e ("platform/x86: GPD pocket fan: Use a min-speed of 2 while charging")
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
>  drivers/platform/x86/gpd-pocket-fan.c | 24 ++++++++++++++++++------
>  1 file changed, 18 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/platform/x86/gpd-pocket-fan.c b/drivers/platform/x86/gpd-pocket-fan.c
> index be85ed966bf3..1e6a42f2ea8a 100644
> --- a/drivers/platform/x86/gpd-pocket-fan.c
> +++ b/drivers/platform/x86/gpd-pocket-fan.c
> @@ -16,17 +16,26 @@
>
>  #define MAX_SPEED 3
>
> -static int temp_limits[3] = { 55000, 60000, 65000 };
> +#define TEMP_LIMIT0_DEFAULT    55000
> +#define TEMP_LIMIT1_DEFAULT    60000
> +#define TEMP_LIMIT2_DEFAULT    65000
> +
> +#define HYSTERESIS_DEFAULT     3000
> +
> +#define SPEED_ON_AC_DEFAULT    2
> +
> +static int temp_limits[3] = {
> +       TEMP_LIMIT0_DEFAULT, TEMP_LIMIT1_DEFAULT, TEMP_LIMIT2_DEFAULT };

I would rather put }; on the next line.
But okay, I'll do it myself when applying.

>  module_param_array(temp_limits, int, NULL, 0444);
>  MODULE_PARM_DESC(temp_limits,
>                  "Millicelsius values above which the fan speed increases");
>
> -static int hysteresis = 3000;
> +static int hysteresis = HYSTERESIS_DEFAULT;
>  module_param(hysteresis, int, 0444);
>  MODULE_PARM_DESC(hysteresis,
>                  "Hysteresis in millicelsius before lowering the fan speed");
>
> -static int speed_on_ac = 2;
> +static int speed_on_ac = SPEED_ON_AC_DEFAULT;
>  module_param(speed_on_ac, int, 0444);
>  MODULE_PARM_DESC(speed_on_ac,
>                  "minimum fan speed to allow when system is powered by AC");
> @@ -120,18 +129,21 @@ static int gpd_pocket_fan_probe(struct platform_device *pdev)
>                 if (temp_limits[i] < 40000 || temp_limits[i] > 70000) {
>                         dev_err(&pdev->dev, "Invalid temp-limit %d (must be between 40000 and 70000)\n",
>                                 temp_limits[i]);
> -                       return -EINVAL;
> +                       temp_limits[0] = TEMP_LIMIT0_DEFAULT;
> +                       temp_limits[1] = TEMP_LIMIT1_DEFAULT;
> +                       temp_limits[2] = TEMP_LIMIT2_DEFAULT;
> +                       break;
>                 }
>         }
>         if (hysteresis < 1000 || hysteresis > 10000) {
>                 dev_err(&pdev->dev, "Invalid hysteresis %d (must be between 1000 and 10000)\n",
>                         hysteresis);
> -               return -EINVAL;
> +               hysteresis = HYSTERESIS_DEFAULT;
>         }
>         if (speed_on_ac < 0 || speed_on_ac > MAX_SPEED) {
>                 dev_err(&pdev->dev, "Invalid speed_on_ac %d (must be between 0 and 3)\n",
>                         speed_on_ac);
> -               return -EINVAL;
> +               speed_on_ac = SPEED_ON_AC_DEFAULT;
>         }
>
>         fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
> --
> 2.24.1
>


-- 
With Best Regards,
Andy Shevchenko