linux-kernel - Re: [PATCH 1/5] drivers/ata: Move a dereference below a NULL test

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Date:	Tue, 14 Jul 2009 22:43:58 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Julia Lawall <julia@...u.dk>
CC:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/5] drivers/ata: Move a dereference below a NULL test

Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> 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>
> 
> ---
>  drivers/ata/pata_at91.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff -u -p a/drivers/ata/pata_at91.c b/drivers/ata/pata_at91.c
> --- a/drivers/ata/pata_at91.c
> +++ b/drivers/ata/pata_at91.c
> @@ -312,11 +312,12 @@ err_ide_ioremap:
>  static int __devexit pata_at91_remove(struct platform_device *pdev)
>  {
>  	struct ata_host *host = dev_get_drvdata(&pdev->dev);
> -	struct at91_ide_info *info = host->private_data;
> +	struct at91_ide_info *info;
>  	struct device *dev = &pdev->dev;
>  
>  	if (!host)
>  		return 0;
> +	info = host->private_data;
>  

applied


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