linux-kernel - Re: [PATCH v2 14/16] thermal/drivers/acerhdf: Make interval setting only at module load time

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Message-ID: <9a796049-3a6e-90dd-6af5-8c4f659a53f7@redhat.com>
Date:   Tue, 21 Feb 2023 21:07:47 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>, rafael@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Kaestle <peter@...e.net>,
        Mark Gross <markgross@...nel.org>,
        "open list:ACER ASPIRE ONE TEMPERATURE AND FAN DRIVER" 
        <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH v2 14/16] thermal/drivers/acerhdf: Make interval setting
 only at module load time

Hi,

On 2/21/23 19:07, Daniel Lezcano wrote:
> The thermal zone device structure is in the process of being private
> to the thermal framework core code. This driver is directly accessing
> and changing the monitoring polling rate.
> 
> After discussing with the maintainers of this driver, having the
> polling interval at module loading time is enough for their purpose.
> 
> Change the code to take into account the interval when the module is
> loaded but restrict the permissions so the value can not be changed
> afterwards.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> Acked-by: Peter Kaestle <peter@...e.net>

Thanks, looks good to me, here is my ack for merging this through
the thermal tree.

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans



> ---
>  drivers/platform/x86/acerhdf.c | 12 +++---------
>  1 file changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
> index 1956469c3457..61f1c3090867 100644
> --- a/drivers/platform/x86/acerhdf.c
> +++ b/drivers/platform/x86/acerhdf.c
> @@ -79,7 +79,6 @@ static unsigned int list_supported;
>  static unsigned int fanstate = ACERHDF_FAN_AUTO;
>  static char force_bios[16];
>  static char force_product[16];
> -static unsigned int prev_interval;
>  static struct thermal_zone_device *thz_dev;
>  static struct thermal_cooling_device *cl_dev;
>  static struct platform_device *acerhdf_dev;
> @@ -346,20 +345,15 @@ static void acerhdf_check_param(struct thermal_zone_device *thermal)
>  	trips[0].temperature = fanon;
>  	trips[0].hysteresis  = fanon - fanoff;
>  
> -	if (kernelmode && prev_interval != interval) {
> +	if (kernelmode) {
>  		if (interval > ACERHDF_MAX_INTERVAL) {
>  			pr_err("interval too high, set to %d\n",
>  			       ACERHDF_MAX_INTERVAL);
>  			interval = ACERHDF_MAX_INTERVAL;
>  		}
> +
>  		if (verbose)
>  			pr_notice("interval changed to: %d\n", interval);
> -
> -		if (thermal)
> -			thermal->polling_delay_jiffies =
> -				round_jiffies(msecs_to_jiffies(interval * 1000));
> -
> -		prev_interval = interval;
>  	}
>  }
>  
> @@ -807,5 +801,5 @@ static const struct kernel_param_ops interval_ops = {
>  	.get = param_get_uint,
>  };
>  
> -module_param_cb(interval, &interval_ops, &interval, 0600);
> +module_param_cb(interval, &interval_ops, &interval, 0000);
>  MODULE_PARM_DESC(interval, "Polling interval of temperature check");