linux-kernel - [PATCH v2 2/2] platform/x86/drivers/acerhdf: Check the interval value when it is set

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Date:   Thu,  3 Dec 2020 08:17:38 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     daniel.lezcano@...aro.org, peter@...e.net, hdegoede@...hat.com,
        mgross@...ux.intel.com
Cc:     platform-driver-x86@...r.kernel.org (open list:ACER ASPIRE ONE
        TEMPERATURE AND FAN DRIVER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 2/2] platform/x86/drivers/acerhdf: Check the interval value when it is set

Currently the code checks the interval value when the temperature is
read which is bad for two reasons:

 - checking and setting the interval in the get_temp callback is
   inaccurate and awful, that can be done when changing the value.

 - Changing the thermal zone structure internals is an abuse of the
   exported structure, moreover no lock is taken here.

The goal of this patch is to solve the first item by using the 'set'
function called when changing the interval. The check is done there
and removed from the get_temp function. If the thermal zone was not
initialized yet, the interval is not updated in this case as that will
happen in the init function when registering the thermal zone device.

I don't have any hardware to test the changes.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 V2:
   - Fixed static function annotation
---
 drivers/platform/x86/acerhdf.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
index 19fc8ff2225c..b6aa6e5514f4 100644
--- a/drivers/platform/x86/acerhdf.c
+++ b/drivers/platform/x86/acerhdf.c
@@ -334,7 +334,10 @@ static void acerhdf_check_param(struct thermal_zone_device *thermal)
 		}
 		if (verbose)
 			pr_notice("interval changed to: %d\n", interval);
-		thermal->polling_delay = interval*1000;
+
+		if (thermal)
+			thermal->polling_delay = interval*1000;
+
 		prev_interval = interval;
 	}
 }
@@ -349,8 +352,6 @@ static int acerhdf_get_ec_temp(struct thermal_zone_device *thermal, int *t)
 {
 	int temp, err = 0;
 
-	acerhdf_check_param(thermal);
-
 	err = acerhdf_get_temp(&temp);
 	if (err)
 		return err;
@@ -823,8 +824,21 @@ MODULE_ALIAS("dmi:*:*Acer*:pnExtensa*5420*:");
 module_init(acerhdf_init);
 module_exit(acerhdf_exit);
 
+static int interval_set_uint(const char *val, const struct kernel_param *kp)
+{
+	int ret;
+
+	ret = param_set_uint(val, kp);
+	if (ret)
+		return ret;
+
+	acerhdf_check_param(thz_dev);
+
+	return 0;
+}
+
 static const struct kernel_param_ops interval_ops = {
-	.set = param_set_uint,
+	.set = interval_set_uint,
 	.get = param_get_uint,
 };
 
-- 
2.25.1