linux-kernel - Re: [PATCH 1/2] sound/soc/fsl/p1022_ds.c: add missing of_node

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Date:	Mon, 22 Aug 2011 11:18:17 +0100
From:	Liam Girdwood <lrg@...com>
To:	Julia Lawall <julia@...u.dk>
CC:	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	Timur Tabi <timur@...escale.com>,
	Axel Lin <axel.lin@...il.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH 1/2] sound/soc/fsl/p1022_ds.c: add missing of_node_put

On 20/08/11 08:02, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> dma_channel_np has been accessed at this point, so decrease its reference
> count before leaving the function.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> identifier x;
> expression E1!=0,E2,E3,E4;
> statement S;
> iterator I;
> @@
> 
> (
> if (...) { ... when != of_node_put(x)
>                when != x = E3
>                when != E3 = x
> *  return ...;
>  }
> ... when != x = E2
>     when != I(...,x,...) S
> if (...) { ... when != x = E4
>  of_node_put(x); ... return ...; }
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  sound/soc/fsl/p1022_ds.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/fsl/p1022_ds.c b/sound/soc/fsl/p1022_ds.c
> index 8fa4d5f..fcb862e 100644
> --- a/sound/soc/fsl/p1022_ds.c
> +++ b/sound/soc/fsl/p1022_ds.c
> @@ -297,8 +297,10 @@ static int get_dma_channel(struct device_node *ssi_np,
>  	 * dai->platform name should already point to an allocated buffer.
>  	 */
>  	ret = of_address_to_resource(dma_channel_np, 0, &res);
> -	if (ret)
> +	if (ret) {
> +		of_node_put(dma_channel_np);
>  		return ret;
> +	}
>  	snprintf((char *)dai->platform_name, DAI_NAME_SIZE, "%llx.%s",
>  		 (unsigned long long) res.start, dma_channel_np->name);
>  
> 

Both

Acked-by: Liam Girdwood <lrg@...com>
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