linux-kernel - Re: [PATCH] iio: fix sched WARNING "do not call blocking ops when !TASK

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Date:	Mon, 8 Aug 2016 15:23:19 -0700
From:	Brian Norris <briannorris@...omium.org>
To:	Lars-Peter Clausen <lars@...afoo.de>
Cc:	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>,
	Brian Norris <computersforpeace@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] iio: fix sched WARNING "do not call blocking ops when
 !TASK_RUNNING"

Hi Lars,

On Thu, Aug 04, 2016 at 12:21:08PM +0200, Lars-Peter Clausen wrote:
> And then also drop the if (!indio_dev->info) at the beginning of the function.

I was poking through the usage of this ->info field, and it looks like
it's supposed to be protected by the 'info_exist_lock' lock, but that's
not being acquired here and in at least one other location. Is this
another bug?

Brian