linux-kernel - Re: [PATCH 1/14] i2c: mpc: delete unneeded test before of_node

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Date:	Fri, 8 Aug 2014 12:25:36 +0200
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	Wolfram Sang <wsa@...-dreams.de>, kernel-janitors@...r.kernel.org,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 1/14] i2c: mpc: delete unneeded test before of_node_put

Hello,

On Fri, Aug 08, 2014 at 12:07:42PM +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.
Thanks for picking up my suggestion.

> The semantic patch that fixes this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression e;
> @@
> 
> -if (e)
>    of_node_put(e);
> // </smpl>
> 

I added devicetree@...r.kernel.org to Cc. Maybe they want to comment the
series? If it's acceptable the logical next step is to add the patch to
the collection of semantic patches, right?

Best regards
Uwe

> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> 
> ---
>  drivers/i2c/busses/i2c-mpc.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
> index 6a32aa0..0edf630 100644
> --- a/drivers/i2c/busses/i2c-mpc.c
> +++ b/drivers/i2c/busses/i2c-mpc.c
> @@ -341,8 +341,7 @@ static u32 mpc_i2c_get_sec_cfg_8xxx(void)
>  			iounmap(reg);
>  		}
>  	}
> -	if (node)
> -		of_node_put(node);
> +	of_node_put(node);
>  
>  	return val;
>  }
> 
> 

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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