linux-kernel - Re: [PATCH] cpufreq: stats: do cpufreq_cpu_put() corresponding to cpufreq_cpu

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Message-ID: <1557799.tbMLSpRn7J@vostro.rjw.lan>
Date:	Fri, 22 Mar 2013 14:22:39 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Amit Kucheria <amit.kucheria@...aro.org>,
	Robin Randhawa <robin.randhawa@....com>,
	linux-pm@...r.kernel.org, Liviu Dudau <Liviu.Dudau@....com>,
	linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org,
	Steve Bannister <Steve.Bannister@....com>,
	Arvind Chauhan <arvind.chauhan@....com>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Charles Garcia-Tobin <charles.garcia-tobin@....com>
Subject: Re: [PATCH] cpufreq: stats: do cpufreq_cpu_put() corresponding to cpufreq_cpu_get

On Friday, March 22, 2013 05:40:25 PM Viresh Kumar wrote:
> On 22 March 2013 17:42, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > Which would be useful to write in the changelog, wouldn't it?
> 
> Hmm..
> 
> copy-paste with gmail is also broken, so find it attached too.
> 
> New change log, no change in patch and you can trust me on that :)

OK, applied to bleeding-edge.

Thanks,
Rafael


> ----------x-------------x--------
> 
> From 034e5ac4cccd09872592a46decd38d5f24047f10 Mon Sep 17 00:00:00 2001
> Message-Id: <034e5ac4cccd09872592a46decd38d5f24047f10.1363954124.git.viresh.kumar@...aro.org>
> From: Viresh Kumar <viresh.kumar@...aro.org>
> Date: Fri, 22 Mar 2013 15:15:48 +0530
> Subject: [PATCH] cpufreq: stats: do cpufreq_cpu_put() corresponding to
>  cpufreq_cpu_get
> 
> In cpufreq_stats_free_sysfs() we aren't balancing calls to cpufreq_cpu_get()
> with cpufreq_cpu_put(). This will never let us have ref count to policy->kobj as
> zero.
> 
> We will get a hang if somehow cpufreq_driver_unregister() is called. And that
> can happen when we compile our driver as module and insmod/rmmod it.
> 
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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