linux-kernel - Re: [RFC v3] cpufreq: Make sure frequency transitions are serialized

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Message-ID: <CAKohpomQjvkAaty-nBSb=Qyxvk0RhvkwNXC9194gmYr6Vpw5WA@mail.gmail.com>
Date:	Wed, 19 Mar 2014 19:05:45 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Amit Daniel <amit.daniel@...sung.com>
Subject: Re: [RFC v3] cpufreq: Make sure frequency transitions are serialized

On 19 March 2014 17:45, Srivatsa S. Bhat
<srivatsa.bhat@...ux.vnet.ibm.com> wrote:
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> +       bool                    transition_ongoing; /* Tracks transition status */
> +       struct mutex            transition_lock;
> +       wait_queue_head_t       transition_wait;

Similar to what I have done in my last version, why do you need
transition_ongoing and transition_wait? Simply work with
transition_lock? i.e. Acquire it for the complete transition sequence.
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