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

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Message-ID: <CANuQgHG23F7zGxbNJVzGAeCsNNPU_CwSu5veK2-CCjnc1RE-UQ@mail.gmail.com>
Date:	Thu, 15 May 2014 13:55:39 +0530
From:	Chander Kashyap <chander.kashyap@...aro.org>
To:	Nishanth Menon <nm@...com>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>, Len Brown <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] PM / OPP: discard duplicate OPP additions

On 14 May 2014 19:57, Nishanth Menon <nm@...com> wrote:
> On 05/14/2014 06:08 AM, Viresh Kumar wrote:
>> On 14 May 2014 15:01, Chander Kashyap <chander.kashyap@...aro.org> wrote:
>>>> say we do at this point:
>>>> if (new_opp->rate == opp->rate) {
>>>>   dev_err(dev, "%s: attempt to add duplicate OPP entry (rate=%ld)\n",
>>>> __func__, new_opp->rate)
>>>>    kfree(new_opp);
>>>>     return -EINVAL;
>>>> }
>>>
>>> Yes this is more cleaner.
>>> But instead of dev_err,  we should use dev_warn and secondly
>>
>> Correct
>>
>>> return 0 rather than EINVAL, as there are independent users for this function
>>
>> Why? We should actually use EEXIST here instead of EINVAL though..
>>
> Yep -EEXIST is the right return value here. As Viresh indicated,
> reporting back 0 when the requested operation actually was not
> performed is wrong. Caller is supposed to know when it makes an error
> - hiding it is not correct.
>

Then in that case the caller must take care for two type of errors:
-EEXIST and -ENOMEM

> --
> Regards,
> Nishanth Menon



-- 
with warm regards,
Chander Kashyap
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