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From: Lars-Peter Clausen <lars@metafoo.de>
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Subject: Re: [PATCH v2] iio: fix sched WARNING "do not call blocking ops when  !TASK_RUNNING"
Date: Sun, 21 Aug 2016 15:00:01 +0200
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On 08/21/2016 01:21 PM, Jonathan Cameron wrote:
[...]
> I've applied to this to the fixes-togreg branch of iio.git
> 
> For now I haven't marked it for stable, purely because I'm not sure
> when the first 'problem' usage was introduced.  I'm happy to explicitly
> send a request for stable inclusion if anyone wants to track down
> which stable trees this is applicable to.
> 
> I've very low on time today (holiday catch up) so won't get to
> dig into it myself for a at least a few weeks.

The issue has been around for a bit longer, but the wait_woken()
infrastructure has only available since v3.19.