linux-kernel - Re: [PATCH V2 06/13] thermal/drivers/hisi: Remove pointless lock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 8 Sep 2017 11:31:00 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Eduardo Valentin <edubezval@...il.com>
Cc:     rui.zhang@...el.com, linux-pm@...r.kernel.org,
        kevin.wangtao@...aro.org, leo.yan@...aro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 06/13] thermal/drivers/hisi: Remove pointless lock

On 08/09/2017 05:16, Eduardo Valentin wrote:
> On Mon, Sep 04, 2017 at 09:56:05PM +0200, Daniel Lezcano wrote:
>> The threaded interrupt inspect the sensors structure to look in the temp
>> threshold field, but this field is read-only in all the code, except in the
>> probe function before the threaded interrupt is set. In other words there
>> is not race window in the threaded interrupt when reading the field value.
> 
> 
> Sure? Not even if you have a userspace process read the zone temp via
> sysfs and the polling workqueue reading the temp too?

They are both read-only operations. There is no write-read race.


-- 
 <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs

Follow Linaro:  <http://www.facebook.com/pages/Linaro> Facebook |
<http://twitter.com/#!/linaroorg> Twitter |
<http://www.linaro.org/linaro-blog/> Blog