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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Date:	Thu, 23 Jul 2015 13:24:50 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	"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>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"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 Thu, Jul 23, 2015 at 01:10:57PM +0300, Dan Carpenter wrote:
> In this specific case, writing it as "if (ret != 0)" caused the bug.  If
> we had written it as "if (ret) return ret;" then there are no zeroes so
> wouldn't have been any temptation to return the zero instead of the ret.

I did a search to see if returning the zero instead of the ret was a
common mistake and it seems like it might be.  I did:

grep 'if (ret != 0)' drivers/   -r -A1 -n | grep "return 0;" | perl -ne 's/.c-(\d+)-/.c:$1/; print'

drivers/gpu/drm/nouveau/nouveau_display.c:111                   return 0;
drivers/regulator/wm8400-regulator.c:47         return 0;
drivers/platform/x86/dell-laptop.c:859          return 0;
drivers/media/dvb-frontends/dibx000_common.c:213                                return 0;
drivers/media/dvb-frontends/dibx000_common.c:217                                return 0;
drivers/media/dvb-frontends/dibx000_common.c:235                                return 0;
drivers/media/dvb-frontends/dibx000_common.c:239                                return 0;
drivers/hv/channel.c:898                return 0;
drivers/hv/channel.c:944                return 0;

A bunch of those look suspicious but I don't know the subsystems well
enough to be sure.  Can you check the last two?

regards,
dan carpenter
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