From patchwork Thu Jul 26 08:41:23 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Rui X-Patchwork-Id: 1240841 Return-Path: X-Original-To: patchwork-linux-acpi@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 493A34025E for ; Thu, 26 Jul 2012 08:42:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751957Ab2GZImG (ORCPT ); Thu, 26 Jul 2012 04:42:06 -0400 Received: from mga02.intel.com ([134.134.136.20]:39947 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751724Ab2GZImF (ORCPT ); Thu, 26 Jul 2012 04:42:05 -0400 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP; 26 Jul 2012 01:42:05 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.67,352,1309762800"; d="scan'208";a="171639169" Received: from rui-x220.sh.intel.com ([10.239.193.100]) by orsmga001.jf.intel.com with ESMTP; 26 Jul 2012 01:42:03 -0700 From: Zhang Rui To: "Rafael J. Wysocki" , Matthew Garrett , Len Brown , R Durgadoss , Eduardo Valentin , Amit Kachhap , Wei Ni , Zhang Rui Cc: linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH V4 13/13] Thermal: Introduce locking for cdev.thermal_instances list. Date: Thu, 26 Jul 2012 16:41:23 +0800 Message-Id: <1343292083-2047-14-git-send-email-rui.zhang@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1343292083-2047-1-git-send-email-rui.zhang@intel.com> References: <1343292083-2047-1-git-send-email-rui.zhang@intel.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org we need to go over all the thermal_instance list of a cooling device to decide which cooling state to put the cooling device to. But at this time, as a cooling device may be referenced in multiple thermal zones, we need to lock the list first in case another thermal zone is updating this cooling device. Signed-off-by: Zhang Rui Reviewed-by: Rafael J. Wysocki Reviewed-by: Eduardo Valentin --- drivers/thermal/thermal_sys.c | 8 ++++++++ include/linux/thermal.h | 1 + 2 files changed, 9 insertions(+) diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 7f3a891..356a59d 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -799,6 +799,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, goto remove_symbol_link; mutex_lock(&tz->lock); + mutex_lock(&cdev->lock); list_for_each_entry(pos, &tz->thermal_instances, tz_node) if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { result = -EEXIST; @@ -808,6 +809,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, list_add_tail(&dev->tz_node, &tz->thermal_instances); list_add_tail(&dev->cdev_node, &cdev->thermal_instances); } + mutex_unlock(&cdev->lock); mutex_unlock(&tz->lock); if (!result) @@ -840,14 +842,17 @@ int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, struct thermal_instance *pos, *next; mutex_lock(&tz->lock); + mutex_lock(&cdev->lock); list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) { if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { list_del(&pos->tz_node); list_del(&pos->cdev_node); + mutex_unlock(&cdev->lock); mutex_unlock(&tz->lock); goto unbind; } } + mutex_unlock(&cdev->lock); mutex_unlock(&tz->lock); return -ENODEV; @@ -913,6 +918,7 @@ thermal_cooling_device_register(char *type, void *devdata, } strcpy(cdev->type, type); + mutex_init(&cdev->lock); INIT_LIST_HEAD(&cdev->thermal_instances); cdev->ops = ops; cdev->updated = true; @@ -1016,6 +1022,7 @@ static void thermal_cdev_do_update(struct thermal_cooling_device *cdev) if (cdev->updated) return; + mutex_lock(&cdev->lock); /* Make sure cdev enters the deepest cooling state */ list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) { if (instance->target == THERMAL_NO_TARGET) @@ -1023,6 +1030,7 @@ static void thermal_cdev_do_update(struct thermal_cooling_device *cdev) if (instance->target > target) target = instance->target; } + mutex_unlock(&cdev->lock); cdev->ops->set_cur_state(cdev, target); cdev->updated = true; } diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 06fd04d..d02d06d 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -95,6 +95,7 @@ struct thermal_cooling_device { void *devdata; const struct thermal_cooling_device_ops *ops; bool updated; /* true if the cooling device does not need update */ + struct mutex lock; /* protect thermal_instances list */ struct list_head thermal_instances; struct list_head node; };