From patchwork Sat Apr 15 03:08:28 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "J, KEERTHY" X-Patchwork-Id: 9682115 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EF3EA60132 for ; Sat, 15 Apr 2017 03:09:00 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E189A2859A for ; Sat, 15 Apr 2017 03:09:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D654C285F7; Sat, 15 Apr 2017 03:09:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 614DD2859A for ; Sat, 15 Apr 2017 03:08:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751463AbdDODIv (ORCPT ); Fri, 14 Apr 2017 23:08:51 -0400 Received: from lelnx193.ext.ti.com ([198.47.27.77]:58061 "EHLO lelnx193.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751010AbdDODIu (ORCPT ); Fri, 14 Apr 2017 23:08:50 -0400 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by lelnx193.ext.ti.com (8.15.1/8.15.1) with ESMTP id v3F38lKM012875; Fri, 14 Apr 2017 22:08:47 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ti.com; s=ti-com-17Q1; t=1492225727; bh=EX9C21lKvB/BYclXyzaNWJ/3FeOLiCWBILwe7bAgZ2c=; h=From:To:CC:Subject:Date; b=We05wmHXrzwEUeb76hi1Ip58CIu1gNEHtOd97i5hT2Ku4VK7ddtuJf3Xd/0/XSCuf ffE/8n1YpoV7TxEQn/EJFPTbKmA6XtGUM7XtbmdJyQL41hUY929ASW2qNdZ6VNvVWd ydgjFBBQIoKGbi+6DC+glzh95SviTKG1K7mYtv0w= Received: from DLEE70.ent.ti.com (dlee70.ent.ti.com [157.170.170.113]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id v3F38l8x006118; Fri, 14 Apr 2017 22:08:47 -0500 Received: from dflp33.itg.ti.com (10.64.6.16) by DLEE70.ent.ti.com (157.170.170.113) with Microsoft SMTP Server id 14.3.294.0; Fri, 14 Apr 2017 22:08:46 -0500 Received: from ula0393675.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp33.itg.ti.com (8.14.3/8.13.8) with ESMTP id v3F38flm021492; Fri, 14 Apr 2017 22:08:42 -0500 From: Keerthy To: , CC: , , , , , Subject: [PATCH v5 1/2] thermal: core: Allow orderly_poweroff to be called only once Date: Sat, 15 Apr 2017 08:38:28 +0530 Message-ID: <1492225709-30932-1-git-send-email-j-keerthy@ti.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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. Signed-off-by: Keerthy Acked-by: Eduardo Valentin --- Changes in v5: * Added Eduardo's Ack. 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; }