linux-kernel - Re: [PATCH 4/11] drivers/mmc: Move a dereference below a NULL test

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Message-ID: <20081221171955.15c82df8@mjolnir.drzeus.cx>
Date:	Sun, 21 Dec 2008 17:19:55 +0100
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	Julia Lawall <julia@...u.dk>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 4/11] drivers/mmc: Move a dereference below a NULL test

On Tue, 16 Dec 2008 16:13:09 +0100 (CET)
Julia Lawall <julia@...u.dk> wrote:

> From: Julia Lawall <julia@...u.dk>
> 
> In each case, if the NULL test is necessary, then the dereference should be
> moved below the NULL test.
> 
> The semantic patch that makes this change is as follows:
> (http://www.emn.fr/x-info/coccinelle/)
> 
> // <smpl>
> @@
> type T;
> expression E;
> identifier i,fld;
> statement S;
> @@
> 
> - T i = E->fld;
> + T i;
>   ... when != E
>       when != i
>   if (E == NULL) S
> + i = E->fld;
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 

Quite right. Queued up.

Rgds
-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org

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