linux-kernel - Re: [PATCH V3 3/7] Drivers: hv: vmbus: add APIs to send/recv hvsock packet and get the r/w-ability

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Message-ID: <20150722103546.GO5371@mwanda>
Date:	Wed, 22 Jul 2015 13:35:46 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	Vitaly Kuznetsov <vkuznets@...hat.com>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"pebolle@...cali.nl" <pebolle@...cali.nl>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"driverdev-devel@...uxdriverproject.org" 
	<driverdev-devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>,
	"stefanha@...hat.com" <stefanha@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"davem@...emloft.net" <davem@...emloft.net>
Subject: Re: [PATCH V3 3/7] Drivers: hv: vmbus: add APIs to send/recv hvsock
 packet and get the r/w-ability

On Wed, Jul 22, 2015 at 10:09:10AM +0000, Dexuan Cui wrote:
> > I'd suggest you do something like
> > 
> >     if (ret == -EAGIAIN)
> >         return 0;
> >     else if (ret)
> >         return ret;
> > 
> > to make it future-proof (e.g. when a new error is returned by
> > hv_ringbuffer_peek). And a comment would also be useful as it is unclear
> > why we silence errors here.
> Hi Vitaly,
> Thanks! 
> I think I made a mistake here:
> the "if (ret != 0) return 0;" should be changed
> to   "if (ret != 0) return ret;"

The double negative really doesn't not make the code more complicated.
I like using a quadruple negative instead.

	if (ret != 0 != 0)
		return ret;

regards,
dan carpenter


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