linux-kernel - Re: Deadlock scenario in regulator core

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Message-ID: <1300838856.14261.35.camel@gandalf.stny.rr.com>
Date:	Tue, 22 Mar 2011 20:07:36 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	David Collins <collinsd@...eaurora.org>
Cc:	Liam Girdwood <lrg@...mlogic.co.uk>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Deadlock scenario in regulator core

On Tue, 2011-03-22 at 16:41 -0700, David Collins wrote:

> There seem to be very few uses of mutex_lock_nested() in the kernel.  Most
> of them use subclass = SINGLE_DEPTH_NESTING.  Would this be sufficient for
> usage in the regulator core in _notifier_call_chain (and perhaps other
> places) or should some other subclass be used?

Note, I do not know this code well enough to say. I'm assuming that an
rdevA on a rdevB->supply_list never has rdevB on its own
rdevA->supply_list.

If this is the case, and that you only ever have a lock nesting of one,
then sure, use the SINGLE_DEPTH_NESTING.

Peter or Ingo could correct me if I'm wrong.

-- Steve



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