linux-kernel - Re: [PATCH 1/1] net/dsa/dsa.c: remove null test before kfree

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Message-Id: <20140621113653.6b2dd148b35a6ecfb7c08cce@skynet.be>
Date:	Sat, 21 Jun 2014 11:36:53 +0200
From:	Fabian Frederick <fabf@...net.be>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Grant Likely <grant.likely@...aro.org>, netdev@...r.kernel.org,
	Joe Perches <joe@...ches.com>
Subject: Re: [PATCH 1/1] net/dsa/dsa.c: remove null test before kfree

On Sat, 21 Jun 2014 10:37:24 +0200
Bjørn Mork <bjorn@...k.no> wrote:

> 
> 
> On 20 June 2014 22:36:47 CEST, Fabian Frederick <fabf@...net.be> wrote:
> >Fix checkpatch warning:
> >WARNING: kfree(NULL) is safe this check is probably not required
> 
> "probably not" implies that there are cases where the check *is* required.  That means that your commit message should explain why this particular check is redundant.
> 
> I haven't analyzed your changes here, so they could be fine for all I know. My point is that such analysis is your job when submitting cleanups like this one.
> 
> 
> 
AFAIK, any

if(foo)
	kfree(foo)
	
can be updated to kfree(foo) but

if (foo){
	kfree(foo)
	do something else
}

has to be evaluated ; reason for the "probably" in warning message.
If I'm wrong maybe we could be more verbose in checkpatch :)
(I added Joe Perches in Cc list ; maybe he can help here)

Fabian

> Bjørn
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