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From 81ad4276b505e987dd8ebbdf63605f92cd172b52 Mon Sep 17 00:00:00 2001
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From: Zhang Rui <rui.zhang@intel.com>
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Date: Fri, 18 Mar 2016 10:03:24 +0800
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Subject: [PATCH] Thermal: Ignore invalid trip points
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In some cases, platform thermal driver may report invalid trip points,
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thermal core should not take any action for these trip points.
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CC: <stable@vger.kernel.org> #3.18+
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Link: https://bugzilla.redhat.com/show_bug.cgi?id=1317190
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Link: https://bugzilla.kernel.org/show_bug.cgi?id=114551
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Signed-off-by: Zhang Rui <rui.zhang@intel.com>
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---
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drivers/thermal/thermal_core.c | 13 ++++++++++++-
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include/linux/thermal.h | 2 ++
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2 files changed, 14 insertions(+), 1 deletion(-)
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diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
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index a0a8fd1..d4b5465 100644
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--- a/drivers/thermal/thermal_core.c
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+++ b/drivers/thermal/thermal_core.c
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@@ -454,6 +454,10 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
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{
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enum thermal_trip_type type;
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+ /* Ignore disabled trip points */
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+ if (test_bit(trip, &tz->trips_disabled))
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+ return;
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+
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tz->ops->get_trip_type(tz, trip, &type);
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if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
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@@ -1800,6 +1804,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
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{
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struct thermal_zone_device *tz;
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enum thermal_trip_type trip_type;
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+ int trip_temp;
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int result;
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int count;
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int passive = 0;
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@@ -1871,9 +1876,15 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
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goto unregister;
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for (count = 0; count < trips; count++) {
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- tz->ops->get_trip_type(tz, count, &trip_type);
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+ if (tz->ops->get_trip_type(tz, count, &trip_type))
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+ set_bit(count, &tz->trips_disabled);
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if (trip_type == THERMAL_TRIP_PASSIVE)
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passive = 1;
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+ if (tz->ops->get_trip_temp(tz, count, &trip_temp))
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+ set_bit(count, &tz->trips_disabled);
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+ /* Check for bogus trip points */
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+ if (trip_temp == 0)
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+ set_bit(count, &tz->trips_disabled);
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}
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if (!passive) {
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diff --git a/include/linux/thermal.h b/include/linux/thermal.h
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index 9c48199..a55d052 100644
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--- a/include/linux/thermal.h
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+++ b/include/linux/thermal.h
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@@ -156,6 +156,7 @@ struct thermal_attr {
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* @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
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* @devdata: private pointer for device private data
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* @trips: number of trip points the thermal zone supports
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+ * @trips_disabled; bitmap for disabled trips
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* @passive_delay: number of milliseconds to wait between polls when
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* performing passive cooling.
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* @polling_delay: number of milliseconds to wait between polls when
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@@ -191,6 +192,7 @@ struct thermal_zone_device {
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struct thermal_attr *trip_hyst_attrs;
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void *devdata;
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int trips;
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+ unsigned long trips_disabled; /* bitmap for disabled trips */
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int passive_delay;
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int polling_delay;
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int temperature;
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