linux-kernel - Re: [PATCH 10/11] drivers/spi: Move a dereference below a NULL test

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Date:	Wed, 17 Dec 2008 12:22:23 -0800
From:	David Brownell <david-b@...bell.net>
To:	Julia Lawall <julia@...u.dk>
Cc:	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 10/11] drivers/spi: Move a dereference below a NULL test

On Tuesday 16 December 2008, Julia Lawall 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>

Acked-by: David Brownell <dbrownell@...rs.sourceforge.net>

... and I'm *still* glad to see tools shaking loose
goofage like this.  :)


> 
> ---
>  drivers/spi/pxa2xx_spi.c            |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
> index cf12f2d..fbad7e4 100644
> --- a/drivers/spi/pxa2xx_spi.c
> +++ b/drivers/spi/pxa2xx_spi.c
> @@ -1561,11 +1561,12 @@ out_error_master_alloc:
>  static int pxa2xx_spi_remove(struct platform_device *pdev)
>  {
>  	struct driver_data *drv_data = platform_get_drvdata(pdev);
> -	struct ssp_device *ssp = drv_data->ssp;
> +	struct ssp_device *ssp;
>  	int status = 0;
>  
>  	if (!drv_data)
>  		return 0;
> +	ssp = drv_data->ssp;
>  
>  	/* Remove the queue */
>  	status = destroy_queue(drv_data);
> 
> 


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