linux-kernel - Re: [PATCH v3] PM / OPP: discard duplicate OPPs

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Message-ID: <2638341.ymNLNAMmAG@vostro.rjw.lan>
Date:	Tue, 20 May 2014 14:45:24 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	Nishanth Menon <nm@...com>,
	Chander Kashyap <chander.kashyap@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>,
	"Brown, Len" <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Chander Kashyap <k.chander@...sung.com>,
	Inderpal Singh <inderpal.s@...sung.com>
Subject: Re: [PATCH v3] PM / OPP: discard duplicate OPPs

On Tuesday, May 20, 2014 05:35:04 PM Viresh Kumar wrote:
> On 20 May 2014 16:56, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> > But we aren't talking about failure here. Its not failure. The operation
> > we are trying to do is already done and nothing should break if the
> > OPP was already there or its added now. Its all the same.
> 
> Though after more thought into this I feel this must also be done:
> 
> diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
> index bdf09f5..3f540d8 100644
> --- a/drivers/base/power/opp.c
> +++ b/drivers/base/power/opp.c
> @@ -453,9 +453,13 @@ int dev_pm_opp_add(struct device *dev, unsigned
> long freq, unsigned long u_volt)
>         }
> 
>         if (new_opp->rate == opp->rate) {
> +               int ret = 0;

		int ret = new_opp->u_volt == opp->u_volt ? -EEXIST : 0;

would be slightly simpler IMO.

> +
> +               if (new_opp->u_volt == opp->u_volt)
> +                       ret = -EEXIST;
>                 mutex_unlock(&dev_opp_list_lock);
>                 kfree(new_opp);
> -               return 0;
> +               return ret;

>         }
> 
>         list_add_rcu(&new_opp->node, head);


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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