linux-kernel - [PATCH 3/7] thermal: gov_power_allocator: Check the cooling devices only for trip

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 25 Oct 2023 20:22:21 +0100
From:   Lukasz Luba <lukasz.luba@....com>
To:     linux-kernel@...r.kernel.org, daniel.lezcano@...aro.org,
        rafael@...nel.org
Cc:     linux-pm@...r.kernel.org, rui.zhang@...el.com, lukasz.luba@....com
Subject: [PATCH 3/7] thermal: gov_power_allocator: Check the cooling devices only for trip_max

The throttling logic takes care only for the last passive trip point and
attached cooling devices to it. Therefore, there is no need to bail out if
other trip points have a cooling device which is not a supported by IPA.

Check the cooling devices only for the 'trip_max' during the binding.

Signed-off-by: Lukasz Luba <lukasz.luba@....com>
---
 drivers/thermal/gov_power_allocator.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c
index 0dfc5b5ab5235..4b9ef04577a9a 100644
--- a/drivers/thermal/gov_power_allocator.c
+++ b/drivers/thermal/gov_power_allocator.c
@@ -578,6 +578,7 @@ static void allow_maximum_power(struct thermal_zone_device *tz, bool update)
  * check_power_actors() - Check all cooling devices and warn when they are
  *			not power actors
  * @tz:		thermal zone to operate on
+ * @params:	power allocator private data
  *
  * Check all cooling devices in the @tz and warn every time they are missing
  * power actor API. The warning should help to investigate the issue, which
@@ -586,12 +587,16 @@ static void allow_maximum_power(struct thermal_zone_device *tz, bool update)
  * Return: 0 on success, -EINVAL if any cooling device does not implement
  * the power actor API.
  */
-static int check_power_actors(struct thermal_zone_device *tz)
+static int check_power_actors(struct thermal_zone_device *tz,
+			      struct power_allocator_params *params)
 {
 	struct thermal_instance *instance;
 	int ret = 0;
 
 	list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
+		if (instance->trip != params->trip_max)
+			continue;
+
 		if (!cdev_is_power_actor(instance->cdev)) {
 			dev_warn(&tz->device, "power_allocator: %s is not a power actor\n",
 				 instance->cdev->type);
@@ -628,7 +633,7 @@ static int power_allocator_bind(struct thermal_zone_device *tz)
 		return -EINVAL;
 	}
 
-	ret = check_power_actors(tz);
+	ret = check_power_actors(tz, params);
 	if (ret) {
 		dev_warn(&tz->device, "power_allocator: binding failed\n");
 		kfree(params);
-- 
2.25.1