linux-kernel - Re: [PATCH] iio: hi8435: fix race between event enable and event generation

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Date:   Wed, 24 May 2017 22:56:43 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Sanchayan Maity <maitysanchayan@...il.com>,
        Gregor Boirie <gregor.boirie@...rot.com>,
        Matt Ranostay <mranostay@...il.com>, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, Chris Healy <Chris.Healy@....aero>,
        Jeff White <Jeff.White@....aero>,
        Vladimir Barinov <vladimir.barinov@...entembedded.com>
Subject: Re: [PATCH] iio: hi8435: fix race between event enable and event
 generation

>> Add locking to avoid interference between reading/processing current
>> sence in event enable and event generation paths.
>>
>> Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>
> Make sense.  Could you give a little more detail on the seriousness
> of this bug?  I need to assess whether we just queue it up for the
> next merge window or push it forward quicker as a bug fix and
> whether to mark it for stable or not.
> 
> You probably have a better idea of how much it matters than I do!

Race was introduced by my previous patch, and noticed by Vladimir.
It is not in any released tree.

Possible race impact is loss of event or duplicate event.

Nikita