Messages in this thread Patch in this message | | | From | Keerthy <> | Subject | [PATCH v2 1/2] thermal: core: Allow orderly_poweroff to be called only once | Date | Thu, 13 Apr 2017 13:32:35 +0530 |
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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: Nishanth Menon <nm@ti.com> Signed-off-by: Keerthy <j-keerthy@ti.com> ---
Changes in v2:
* Added a global mutex to serialize poweroff code sequence.
drivers/thermal/thermal_core.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index 11f0675..7462ae5 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; tz->ops->get_trip_temp(tz, trip, &trip_temp); @@ -338,11 +340,14 @@ static void handle_critical_trips(struct thermal_zone_device *tz, if (tz->ops->notify) tz->ops->notify(tz, trip, trip_type); - if (trip_type == THERMAL_TRIP_CRITICAL) { + if (trip_type == THERMAL_TRIP_CRITICAL && !power_off_triggered) { dev_emerg(&tz->device, "critical temperature reached(%d C),shutting down\n", tz->temperature / 1000); + mutex_lock(&poweroff_lock); orderly_poweroff(true); + power_off_triggered = true; + mutex_unlock(&poweroff_lock); } } @@ -1463,6 +1468,7 @@ static int __init thermal_init(void) { int result; + mutex_init(&poweroff_lock); result = thermal_register_governors(); if (result) goto error; @@ -1497,6 +1503,7 @@ 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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