In few rare conditions like during boot up the orderly_poweroff
function might not be able to complete fully leaving the device
running at dangerously high temperatures. Hence adding a backup
workqueue to act after a known period of time and poweroff the device.
Suggested-by: Nishanth Menon <nm@xxxxxx>
Reported-by: Nishanth Menon <nm@xxxxxx>
Signed-off-by: Keerthy <j-keerthy@xxxxxx>
---
drivers/thermal/Kconfig | 9 +++++++++
drivers/thermal/thermal_core.c | 26 ++++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 8cc4ac6..25584ee 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -92,6 +92,15 @@ config THERMAL_DEFAULT_GOV_POWER_ALLOCATOR
endchoice
+config THERMAL_BKUP_SHUTDOWN_DELAY_MS
+ int "Thermal shutdown backup delay in milli-seconds"
+ depends on THERMAL
+ default "5000"
+ ---help---
+ The number of milliseconds to delay after orderly_poweroff call.
+
+ Default: 5000 (5 seconds)
+
config THERMAL_GOV_FAIR_SHARE
bool "Fair-share thermal governor"
help
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index d9e525c..b793857 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -61,6 +61,12 @@ static DEFINE_MUTEX(thermal_governor_lock);
static struct thermal_governor *def_governor;
+#ifdef CONFIG_THERMAL_BKUP_SHUTDOWN_DELAY_MS
+#define BKUP_SHUTDOWN_DELAY CONFIG_THERMAL_BKUP_SHUTDOWN_DELAY_MS
+#else
+#define BKUP_SHUTDOWN_DELAY 5000
+#endif
+
static struct thermal_governor *__find_governor(const char *name)
{
struct thermal_governor *pos;
@@ -423,6 +429,18 @@ static void handle_non_critical_trips(struct thermal_zone_device *tz,
def_governor->throttle(tz, trip);
}
+static void bkup_shutdown_func(struct work_struct *unused);
+static DECLARE_DELAYED_WORK(bkup_shutdown_work, bkup_shutdown_func);
+
+static void bkup_shutdown_func(struct work_struct *work)
+{
+ pr_warn("Orderly_poweroff has failed! Attempting kernel_power_off\n");
+ kernel_power_off();
+
+ pr_warn("kernel_power_off has failed! Attempting emergency_restart\n");
+ emergency_restart();
+}
+
static void handle_critical_trips(struct thermal_zone_device *tz,
int trip, enum thermal_trip_type trip_type)
{
@@ -443,6 +461,14 @@ 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);
+ /**
+ * This is a backup option to shutdown the
+ * system in case orderly_poweroff
+ * fails
+ */
+ schedule_delayed_work(&bkup_shutdown_work,
+ msecs_to_jiffies(BKUP_SHUTDOWN_DELAY));
+
orderly_poweroff(true);
}
}
--
1.9.1
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