linux-kernel - [PATCH 4.18 176/228] thermal: of-thermal: disable passive polling when thermal zone is disabled

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Date:   Tue,  2 Oct 2018 06:24:33 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Anson Huang <Anson.Huang@....com>,
        Eduardo Valentin <edubezval@...il.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 176/228] thermal: of-thermal: disable passive polling when thermal zone is disabled

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anson Huang <Anson.Huang@....com>

[ Upstream commit 152395fd03d4ce1e535a75cdbf58105e50587611 ]

When thermal zone is in passive mode, disabling its mode from
sysfs is NOT taking effect at all, it is still polling the
temperature of the disabled thermal zone and handling all thermal
trips, it makes user confused. The disabling operation should
disable the thermal zone behavior completely, for both active and
passive mode, this patch clears the passive_delay when thermal
zone is disabled and restores it when it is enabled.

Signed-off-by: Anson Huang <Anson.Huang@....com>
Signed-off-by: Eduardo Valentin <edubezval@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/thermal/of-thermal.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -260,10 +260,13 @@ static int of_thermal_set_mode(struct th
 
 	mutex_lock(&tz->lock);
 
-	if (mode == THERMAL_DEVICE_ENABLED)
+	if (mode == THERMAL_DEVICE_ENABLED) {
 		tz->polling_delay = data->polling_delay;
-	else
+		tz->passive_delay = data->passive_delay;
+	} else {
 		tz->polling_delay = 0;
+		tz->passive_delay = 0;
+	}
 
 	mutex_unlock(&tz->lock);