linux-kernel - Re: [PATCH] 3c59x: Don't assign when a comparison is intended

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Message-ID: <AANLkTi=yFm+kwXJbFrotTNmWky1J7O8=qVg7rhq=HxZG@mail.gmail.com>
Date:	Sat, 25 Dec 2010 22:00:48 +0100
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	netdev@...r.kernel.org,
	Steffen Klassert <klassert@...hematik.tu-chemnitz.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] 3c59x: Don't assign when a comparison is intended

On Sat, Dec 25, 2010 at 9:45 PM, Jesper Juhl <jj@...osbits.net> wrote:
> On Sat, 25 Dec 2010, richard -rw- weinberger wrote:
>
>> On Sat, Dec 25, 2010 at 9:30 PM, Jesper Juhl <jj@...osbits.net> wrote:
>> > Hi,
>> >
>> > In drivers/net/3c59x.c::vortex_probe1() we have this code:
>> >
>> >        if (gendev) {
>> >                if ((pdev = DEVICE_PCI(gendev))) {
>> >                        print_name = pci_name(pdev);
>> >                }
>> >
>> >                if ((edev = DEVICE_EISA(gendev))) {
>> >                        print_name = dev_name(&edev->dev);
>> >                }
>> >        }
>> >
>> > I believe these assignments were intended to be comparisons.
>> > If I'm correct, then here's a patch to fix that up.
>>
>> I don't think so. Look at the extra brackets.
>>
>> The code can also written as:
>>
>> pdev = DEVICE_PCI(gendev);
>> if(pdev)
>>   print_name = pci_name(pdev);
>>
>
> Arrgh, I completely missed that - damn.
> You are correct I think and my patch is wrong.
> Thanks for taking a look.

BTW: gcc is smart enough to catch such typos.

if(x = 3){
 ...
}

...would trigger a warning like this one:
"warning: suggest parentheses around assignment used as truth value"

>
> --
> Jesper Juhl <jj@...osbits.net>            http://www.chaosbits.net/
> Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
> Plain text mails only, please.
>

-- 
Thanks,
//richard
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