On Friday 14 April 2017 11:30 AM, Eduardo Valentin wrote:
> On Fri, Apr 14, 2017 at 10:48:24AM +0530, Keerthy wrote:
>> thermal_zone_device_check --> thermal_zone_device_update -->
>> handle_thermal_trip --> handle_critical_trips --> orderly_poweroff
>>
>> The above sequence happens every 250/500 mS based on the configuration.
>> The orderly_poweroff function is getting called every 250/500 mS.
>> With a full fledged file system it takes at least 5-10 Seconds to
>> power off gracefully.
>>
>> In that period due to the thermal_zone_device_check triggering
>> periodically the thermal work queues bombard with
>> orderly_poweroff calls multiple times eventually leading to
>> failures in gracefully powering off the system.
>>
>> Make sure that orderly_poweroff is called only once.
>>
>> Reported-by: Keerthy <j-keerthy@xxxxxx>
>> Signed-off-by: Keerthy <j-keerthy@xxxxxx>
>> ---
>>
>> Changes in v3:
>>
>> * Changed the place where mutex was locked and unlocked.
>>
>> Changes in v2:
>>
>> * Added a global mutex to serialize poweroff code sequence.
>>
>> drivers/thermal/thermal_core.c | 11 ++++++++++-
>> 1 file changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
>> index 11f0675..9cad1ba 100644
>> --- a/drivers/thermal/thermal_core.c
>> +++ b/drivers/thermal/thermal_core.c
>> @@ -45,6 +45,7 @@
>>
>> static DEFINE_MUTEX(thermal_list_lock);
>> static DEFINE_MUTEX(thermal_governor_lock);
>> +static DEFINE_MUTEX(poweroff_lock);
>>
>> static atomic_t in_suspend;
>>
>> @@ -326,6 +327,7 @@ static void handle_critical_trips(struct thermal_zone_device *tz,
>> int trip, enum thermal_trip_type trip_type)
>> {
>> int trip_temp;
>> + static bool power_off_triggered;
>
> I would prefer this to be closer to its lock. Can you please move this
> to the global section?
Sure. I can do that.
>
>>
>> tz->ops->get_trip_temp(tz, trip, &trip_temp);
>>
>> @@ -342,7 +344,12 @@ static void handle_critical_trips(struct thermal_zone_device *tz,
>> dev_emerg(&tz->device,
>> "critical temperature reached(%d C),shutting down\n",
>> tz->temperature / 1000);
>> - orderly_poweroff(true);
>> + mutex_lock(&poweroff_lock);
>> + if (!power_off_triggered) {
>> + orderly_poweroff(true);
>> + power_off_triggered = true;
>> + }
>> + mutex_unlock(&poweroff_lock);
>> }
>> }
>>
>> @@ -1463,6 +1470,7 @@ static int __init thermal_init(void)
>> {
>> int result;
>>
>> + mutex_init(&poweroff_lock);
>> result = thermal_register_governors();
>> if (result)
>> goto error;
>> @@ -1497,6 +1505,7 @@ static int __init thermal_init(void)
>> ida_destroy(&thermal_cdev_ida);
>> mutex_destroy(&thermal_list_lock);
>> mutex_destroy(&thermal_governor_lock);
>> + mutex_destroy(&poweroff_lock);
>> return result;
>> }
>>
>> --
>> 1.9.1
>>
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