linux-kernel - Re: [v3.10 regression] deadlock on cpu hotplug

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Message-ID: <CAKohpokbo+X5bEYweBuSqr5bkdRsb-XHT7SrMWybwAvkfDsGBQ@mail.gmail.com>
Date:	Wed, 10 Jul 2013 11:09:53 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
	Tomasz Figa <t.figa@...sung.com>, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [v3.10 regression] deadlock on cpu hotplug

On 10 July 2013 09:42, Michael Wang <wangyun@...ux.vnet.ibm.com> wrote:
> I'm not sure what is supposed after notify CPUFREQ_GOV_STOP event, if it
> is in order to stop queued work and prevent follow work happen again,
> then it failed to, and we need some method to stop queue work again when
> CPUFREQ_GOV_STOP notified, like some flag in policy which will be
> checked before re-queue work in work.
>
> But if the event is just to sync the queued work but not prevent follow
> work happen, then things will become tough...we need confirm.

After GOV_STOP, until the time GOV_START is called, we shouldn't be
queuing any work.
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