4.20-stable review patch. If anyone has any objections, please let me know.
------------------
[ Upstream commit 964f4843a455d2ffb199512b08be8d5f077c4cac ]
commit ff140fea847e ("Thermal: handle thermal zone device properly during system sleep") added PM hook to call thermal zone reset during sleep. However resetting thermal zone will also clear the passive state and thus cancel the polling queue which leads the passive cooling device state not being cleared properly after sleep.
thermal_pm_notify => thermal_zone_device_reset set passive to 0 thermal_zone_trip_update will skip update passive as `old_target == instance->target'. monitor_thermal_zone => thermal_zone_device_set_polling will cancel tz->poll_queue, so the cooling device state will not be changed afterwards.
Reported-by: Kame Wang kamewang@google.com Signed-off-by: Wei Wang wvw@google.com Signed-off-by: Zhang Rui rui.zhang@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/thermal/thermal_core.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index d6ebc1cf6aa9..3a014cd8daf0 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -453,16 +453,20 @@ static void update_temperature(struct thermal_zone_device *tz) tz->last_temperature, tz->temperature); }
-static void thermal_zone_device_reset(struct thermal_zone_device *tz) +static void thermal_zone_device_init(struct thermal_zone_device *tz) { struct thermal_instance *pos; - tz->temperature = THERMAL_TEMP_INVALID; - tz->passive = 0; list_for_each_entry(pos, &tz->thermal_instances, tz_node) pos->initialized = false; }
+static void thermal_zone_device_reset(struct thermal_zone_device *tz) +{ + tz->passive = 0; + thermal_zone_device_init(tz); +} + void thermal_zone_device_update(struct thermal_zone_device *tz, enum thermal_notify_event event) { @@ -1504,7 +1508,7 @@ static int thermal_pm_notify(struct notifier_block *nb, case PM_POST_SUSPEND: atomic_set(&in_suspend, 0); list_for_each_entry(tz, &thermal_tz_list, node) { - thermal_zone_device_reset(tz); + thermal_zone_device_init(tz); thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED); }