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

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Date:	Tue, 20 May 2014 17:35:04 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Nishanth Menon <nm@...com>
Cc:	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>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	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 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;
+
+               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);
--
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