linux-kernel - Re: [PATCH 6/14] powerpc/fsl: fsl_soc: delete unneeded test before of_node

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Date:	Mon, 11 Aug 2014 12:56:50 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	kernel-janitors@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 6/14] powerpc/fsl: fsl_soc: delete unneeded test before
 of_node_put

On Fri, 2014-08-08 at 12:07 +0200, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@...6.fr>
> 
> Of_node_put supports NULL as its argument, so the initial test is not
> necessary.
> 
> Suggested by Uwe Kleine-König.
> 
> The semantic patch that fixes this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression e;
> @@
> 
> -if (e)
>    of_node_put(e);
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

> ---
>  arch/powerpc/sysdev/fsl_soc.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/sysdev/fsl_soc.c b/arch/powerpc/sysdev/fsl_soc.c
> index ffd1169..bfb5b6c 100644
> --- a/arch/powerpc/sysdev/fsl_soc.c
> +++ b/arch/powerpc/sysdev/fsl_soc.c
> @@ -197,8 +197,7 @@ static int __init setup_rstcr(void)
>  	if (!rstcr && ppc_md.restart == fsl_rstcr_restart)
>  		printk(KERN_ERR "No RSTCR register, warm reboot won't work\n");
>  
> -	if (np)
> -		of_node_put(np);
> +	of_node_put(np);
>  
>  	return 0;
>  }
> 
> --
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