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

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Date:	Wed, 14 May 2014 09:27:00 -0500
From:	Nishanth Menon <nm@...com>
To:	Viresh Kumar <viresh.kumar@...aro.org>,
	Chander Kashyap <chander.kashyap@...aro.org>
CC:	"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 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.

-- 
Regards,
Nishanth Menon
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