linux-kernel - Re: [PATCH 5/12] drivers/parisc: Correct redundant test

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Message-ID: <20090803203357.GA2386@lackof.org>
Date:	Mon, 3 Aug 2009 14:33:57 -0600
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Julia Lawall <julia@...u.dk>
Cc:	kyle@...artin.ca, deller@....de, linux-parisc@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 5/12] drivers/parisc: Correct redundant test

On Mon, Jul 27, 2009 at 06:13:48PM +0200, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> pa_pdc_cell has already been tested.  It seems that this test should be on the
> recently returned value io_pdc_cell.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://www.emn.fr/x-info/coccinelle/)
> 
> // <smpl>
> @r exists@
> local idexpression x;
> expression E;
> @@
> 
> if (x == NULL || ...) { ... when forall
>    return ...; }
> ... when != \(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\|&x\)
> (
> *x == NULL
> |
> *x != NULL
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>

Good catch!

Reviewed-by: Grant Grundler <grundler@...isc-linux.org>

thanks,
grant

> ---
>  drivers/parisc/lba_pci.c            |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/parisc/lba_pci.c b/drivers/parisc/lba_pci.c
> index ede6146..3aeb327 100644
> --- a/drivers/parisc/lba_pci.c
> +++ b/drivers/parisc/lba_pci.c
> @@ -992,7 +992,7 @@ lba_pat_resources(struct parisc_device *pa_dev, struct lba_device *lba_dev)
>  		return;
>  
>  	io_pdc_cell = kzalloc(sizeof(pdc_pat_cell_mod_maddr_block_t), GFP_KERNEL);
> -	if (!pa_pdc_cell) {
> +	if (!io_pdc_cell) {
>  		kfree(pa_pdc_cell);
>  		return;
>  	}
> --
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