linux-kernel - Re: [PATCH v1 15/17] thermal/drivers/acerhdf: Make interval setting only at module load time

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Date:   Sun, 19 Feb 2023 21:38:02 +0000
From:   "Peter Kästle" <peter@...e.net>
To:     "Daniel Lezcano" <daniel.lezcano@...aro.org>, rafael@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Hans de Goede" <hdegoede@...hat.com>,
        "Mark Gross" <markgross@...nel.org>,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v1 15/17] thermal/drivers/acerhdf: Make interval
 setting only at module load time

19. Februar 2023 15:38, "Daniel Lezcano" <daniel.lezcano@...aro.org> schrieb:

> 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>


> ---
> 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");
> -- 
> 2.34.1