linux-kernel - Re: [PATCH v2] cpufreq: Make cpufreq_quick

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Message-ID: <20160311235237.GA27500@vireshk-mac-ubuntu>
Date:	Sat, 12 Mar 2016 06:52:37 +0700
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Richard Cochran <rcochran@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, rt@...utronix.de,
	Dirk Brandewie <dirk.brandewie@...il.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH v2] cpufreq: Make cpufreq_quick_get() safe to call.

On 11-03-16, 09:43, Richard Cochran wrote:
> The function, cpufreq_quick_get, accesses the global 'cpufreq_driver' and
> its fields without taking the associated lock, cpufreq_driver_lock.
> 
> Without the locking, nothing guarantees that 'cpufreq_driver' remains
> consistent during the call.  This patch fixes the issue by taking the lock
> before accessing the data structure.
> 
> Cc: Dirk Brandewie <dirk.brandewie@...il.com>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Cc: linux-pm@...r.kernel.org
> Signed-off-by: Richard Cochran <rcochran@...utronix.de>
> ---
>  drivers/cpufreq/cpufreq.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh