From: Sudip Mukherjee <sudipm.mukherjee@gmail•com>
To: Dan Carpenter <dan.carpenter@oracle•com>
Cc: Dexuan Cui <decui@microsoft•com>,
"pebolle@tiscali•nl" <pebolle@tiscali•nl>,
"gregkh@linuxfoundation•org" <gregkh@linuxfoundation•org>,
"jasowang@redhat•com" <jasowang@redhat•com>,
"driverdev-devel@linuxdriverproject•org"
<driverdev-devel@linuxdriverproject•org>,
"olaf@aepfle•de" <olaf@aepfle•de>,
"linux-kernel@vger•kernel.org" <linux-kernel@vger•kernel.org>,
"stephen@networkplumber•org" <stephen@networkplumber•org>,
"stefanha@redhat•com" <stefanha@redhat•com>,
"netdev@vger•kernel.org" <netdev@vger•kernel.org>,
"apw@canonical•com" <apw@canonical•com>,
"davem@davemloft•net" <davem@davemloft•net>
Subject: Re: [PATCH V3 3/7] Drivers: hv: vmbus: add APIs to send/recv hvsock packet and get the r/w-ability
Date: Fri, 24 Jul 2015 11:57:01 +0530 [thread overview]
Message-ID: <20150724062701.GA5525@sudip-PC> (raw)
In-Reply-To: <20150723102449.GR5371@mwanda>
On Thu, Jul 23, 2015 at 01:24:50PM +0300, Dan Carpenter wrote:
> 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;
This is also ok, the function is supposed to return ret or-ed with the
relevant flags based on the scan position. It is considered error if 0
is returned (without any flag).
regards
sudip
next prev parent reply other threads:[~2015-07-24 6:27 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-21 10:58 [PATCH V3 3/7] Drivers: hv: vmbus: add APIs to send/recv hvsock packet and get the r/w-ability Dexuan Cui
2015-07-21 14:07 ` Vitaly Kuznetsov
2015-07-22 10:09 ` Dexuan Cui
2015-07-22 10:35 ` Dan Carpenter
2015-07-23 3:05 ` Dexuan Cui
2015-07-23 10:10 ` Dan Carpenter
2015-07-23 10:24 ` Dan Carpenter
2015-07-23 11:05 ` Dexuan Cui
2015-07-24 6:27 ` Sudip Mukherjee [this message]
2015-07-24 8:33 ` Dan Carpenter
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