From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757220AbcFAD4x (ORCPT ); Tue, 31 May 2016 23:56:53 -0400 Received: from comal.ext.ti.com ([198.47.26.152]:58927 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755805AbcFAD4w (ORCPT ); Tue, 31 May 2016 23:56:52 -0400 Subject: Re: [PATCH 00/15] thermal: sysfs: add locking To: Eduardo Valentin , Rui Zhang References: <1464676296-5610-1-git-send-email-edubezval@gmail.com> CC: Linux PM , LKML From: Keerthy Message-ID: <574E5CFE.6040708@ti.com> Date: Wed, 1 Jun 2016 09:26:46 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <1464676296-5610-1-git-send-email-edubezval@gmail.com> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday 31 May 2016 12:01 PM, Eduardo Valentin wrote: > Hello, > > Several thermal sysfs entries are currently being called > from userspace without locking. Data and calls to ops > are accessed deliberated without any care for locking. > > This patch series attempts to fix this. > > Now that sysfs handlers are on the same place it is easier > to visualize this issue and fix it. The strategy is essentially > to lock any access. Also, functions in thermal core and thermal > helpers are assumed to do the proper locking already. > > This patch series is based on the thermal core reorganization. > > There is no change in the ABI to userspace. The difference > is that now serialization to data will be done. > > For your consideration, I am also adding this to this branch: > git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal sysfs_locking Tested and checked for reading temperatures from all the thermal zones on DRA7/DRA72 and AM57XX-BEAGLE-X15 boards. Also tested emulation using a rebased version of https://lkml.org/lkml/2016/5/10/346 For DRA7/DRA72 and BEAGLE-X15: Tested-by: Keerthy > > Comments are welcome. > > BR, > > Eduardo Valentin (15): > thermal: sysfs: lock tz in type_show > thermal: sysfs: lock tz while on access to mode properties > thermal: sysfs: lock tz while on trip_point_type properties > thermal: sysfs: lock tz while on trip_point_temp properties > thermal: sysfs: lock tz while on trip_point_hyst properties > thermal: sysfs: lock tz while on passive properties > thermal: sysfs: lock tz while on policy properties > thermal: sysfs: improve locking of emul_temp_store() > thermal: sysfs: lock tz when access sustainable power properties > thermal: sysfs: lock tz when access tzp properties > thermal: sysfs: lock cdev while accessing type > thermal: sysfs: lock cdev while accessing max_state > thermal: sysfs: lock cdev while accessing cur_state > thermal: sysfs: serialize access to instances > thermal: sysfs: add comments describing locking strategy > > drivers/thermal/thermal_sysfs.c | 133 ++++++++++++++++++++++++++++++++++------ > include/linux/thermal.h | 2 +- > 2 files changed, 115 insertions(+), 20 deletions(-) >