linux-kernel - Re: [PATCH 1/5] avr32: fix error return code

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Message-ID: <20140807130004.GA10918@samfundet.no>
Date:	Thu, 7 Aug 2014 15:00:04 +0200
From:	Hans-Christian Egtvedt <egtvedt@...fundet.no>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	Haavard Skinnemoen <hskinnemoen@...il.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] avr32: fix error return code

Around Thu 07 Aug 2014 14:49:05 +0200 or thereabout, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@...6.fr>
> 
> Convert a zero return value on error to a negative one, as returned
> elsewhere in the function.

Excellent find, added to this for-linus branch.

> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> identifier ret; expression e1,e2;
> @@
> (
> if (\(ret < 0\|ret != 0\))
>  { ... return ret; }
> |
> ret = 0
> )
> ... when != ret = e1
>     when != &ret
> *if(...)
> {
>   ... when != ret = e2
>       when forall
>  return ret;
> }
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

Acked-by: Hans-Christian Egtvedt <egtvedt@...fundet.no>

> ---
>  arch/avr32/boards/hammerhead/flash.c |   11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)

<snipp diff>

-- 
mvh
Hans-Christian Egtvedt
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