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

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

[Daniel Lezcano]

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@linaro.org>
---
 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

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

[Peter Kästle]

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

Acked-by: Peter Kaestle <peter@piie.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

[PATCH v1 16/17] thermal/drivers/acerhdf: Remove pointless governor test

[Daniel Lezcano]

The thermal zone parameter specifies the bang-bang governor.

The Kconfig selects the bang-bang governor. So it is pointless to test
if the governor was set for the thermal zone assuming it may not have
been compiled-in.

Remove the test and prevent another access into the thermal internals.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/platform/x86/acerhdf.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
index 61f1c3090867..71b9c1f922d9 100644
--- a/drivers/platform/x86/acerhdf.c
+++ b/drivers/platform/x86/acerhdf.c
@@ -697,13 +697,6 @@ static int __init acerhdf_register_thermal(void)
 	if (ret)
 		return ret;
 
-	if (strcmp(thz_dev->governor->name,
-				acerhdf_zone_params.governor_name)) {
-		pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
-				acerhdf_zone_params.governor_name);
-		return -EINVAL;
-	}
-
 	return 0;
 }
 
-- 
2.34.1

Re: [PATCH v1 16/17] thermal/drivers/acerhdf: Remove pointless governor test

[Peter Kästle]

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

> The thermal zone parameter specifies the bang-bang governor.
> 
> The Kconfig selects the bang-bang governor. So it is pointless to test
> if the governor was set for the thermal zone assuming it may not have
> been compiled-in.
> 
> Remove the test and prevent another access into the thermal internals.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Acked-by: Peter Kaestle <peter@piie.net>


> ---
> drivers/platform/x86/acerhdf.c | 7 -------
> 1 file changed, 7 deletions(-)
> 
> diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
> index 61f1c3090867..71b9c1f922d9 100644
> --- a/drivers/platform/x86/acerhdf.c
> +++ b/drivers/platform/x86/acerhdf.c
> @@ -697,13 +697,6 @@ static int __init acerhdf_register_thermal(void)
> if (ret)
> return ret;
> 
> - if (strcmp(thz_dev->governor->name,
> - acerhdf_zone_params.governor_name)) {
> - pr_err("Didn't get thermal governor %s, perhaps not compiled into thermal subsystem.\n",
> - acerhdf_zone_params.governor_name);
> - return -EINVAL;
> - }
> -
> return 0;
> }
> 
> -- 
> 2.34.1