Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753511AbdDNIwg (ORCPT ); Fri, 14 Apr 2017 04:52:36 -0400 Received: from fllnx210.ext.ti.com ([198.47.19.17]:61419 "EHLO fllnx210.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752043AbdDNIw1 (ORCPT ); Fri, 14 Apr 2017 04:52:27 -0400 From: Keerthy To: , CC: , , , , , Subject: [PATCH v4 1/2] thermal: core: Allow orderly_poweroff to be called only once Date: Fri, 14 Apr 2017 14:22:12 +0530 Message-ID: <1492159933-4213-1-git-send-email-j-keerthy@ti.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2313 Lines: 81 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 Signed-off-by: Keerthy --- Changes in v4: * power_off_triggered declaration together with mutex definition. 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..8337c27 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -45,8 +45,10 @@ static DEFINE_MUTEX(thermal_list_lock); static DEFINE_MUTEX(thermal_governor_lock); +static DEFINE_MUTEX(poweroff_lock); static atomic_t in_suspend; +static bool power_off_triggered; static struct thermal_governor *def_governor; @@ -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