linux-kernel - [PATCH v1 3/4] thermal: core: Check passive delay in monitor_thermal

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Message-ID: <2004353.PYKUYFuaPT@rjwysocki.net>
Date: Mon, 26 Aug 2024 18:32:36 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Lukasz Luba <lukasz.luba@....com>, Zhang Rui <rui.zhang@...el.com>,
 Huisong Li <lihuisong@...wei.com>
Subject:
 [PATCH v1 3/4] thermal: core: Check passive delay in monitor_thermal_zone()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

The only case in which thermal_zone_device_set_polling() is called
with its second argument equal to zero is when passive cooling is
under way and passive_delay_jiffies is 0, which only happens when
the given thermal zone is not polled at all.

If monitor_thermal_zone() is modified to check passive_delay_jiffies
directly, the check of the thermal_zone_device_set_polling() second
argument against 0 can be dropped and a passive_delay check can be
dropped from thermal_zone_device_register_with_trips(), so change the
code accordingly.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/thermal/thermal_core.c |   16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -323,11 +323,6 @@ static void thermal_zone_broken_disable(
 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 					    unsigned long delay)
 {
-	if (!delay) {
-		cancel_delayed_work(&tz->poll_queue);
-		return;
-	}
-
 	if (delay > HZ)
 		delay = round_jiffies_relative(delay);

@@ -364,7 +359,7 @@ static void thermal_zone_recheck(struct

 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 {
-	if (tz->passive > 0)
+	if (tz->passive > 0 && tz->passive_delay_jiffies)
 		thermal_zone_device_set_polling(tz, tz->passive_delay_jiffies);
 	else if (tz->polling_delay_jiffies)
 		thermal_zone_device_set_polling(tz, tz->polling_delay_jiffies);
@@ -1411,13 +1406,8 @@ thermal_zone_device_register_with_trips(
 	if (num_trips > 0 && !trips)
 		return ERR_PTR(-EINVAL);

-	if (polling_delay) {
-		if (passive_delay > polling_delay)
-			return ERR_PTR(-EINVAL);
-
-		if (!passive_delay)
-			passive_delay = polling_delay;
-	}
+	if (polling_delay && passive_delay > polling_delay)
+		return ERR_PTR(-EINVAL);

 	if (!thermal_class)
 		return ERR_PTR(-ENODEV);