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

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Date:	Mon, 22 Aug 2011 11:18:42 +0100
From:	Liam Girdwood <lrg@...com>
To:	Julia Lawall <julia@...u.dk>
CC:	Timur Tabi <timur@...escale.com>,
	"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>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH] sound/soc/fsl/fsl_dma.c: add missing of_node_put

On 20/08/11 08:23, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> of_parse_phandle increments the reference count of np, so this should be
> decremented before trying the next possibility.
> 
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression e,e1,e2;
> @@
> 
> *e = of_parse_phandle(...)
> ... when != of_node_put(e)
>     when != true e == NULL
>     when != e2 = e
> e = e1
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  sound/soc/fsl/fsl_dma.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/sound/soc/fsl/fsl_dma.c b/sound/soc/fsl/fsl_dma.c
> index 0efc04a..b33271b 100644
> --- a/sound/soc/fsl/fsl_dma.c
> +++ b/sound/soc/fsl/fsl_dma.c
> @@ -880,10 +880,12 @@ static struct device_node *find_ssi_node(struct device_node *dma_channel_np)
>  		np = of_parse_phandle(ssi_np, "fsl,playback-dma", 0);
>  		if (np == dma_channel_np)
>  			return ssi_np;
> +		of_node_put(np);
>  
>  		np = of_parse_phandle(ssi_np, "fsl,capture-dma", 0);
>  		if (np == dma_channel_np)
>  			return ssi_np;
> +		of_node_put(np);
>  	}
>  
>  	return NULL;
> 

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