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

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Date:	Mon, 22 Aug 2011 16:06:43 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Timur Tabi <timur@...escale.com>
Cc:	kernel-janitors@...r.kernel.org, Liam Girdwood <lrg@...com>,
	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, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH] sound/soc/fsl/fsl_dma.c: add missing of_node_put

On Mon, 22 Aug 2011, Timur Tabi wrote:

> Julia Lawall wrote:
> > 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);
> >  	}
> 
> Thanks for catching the problem, Julia, but the fix is not quite correct.  My
> code assumes that of_parse_phandle() doesn't claim the node, but it doesn't
> actually use the node pointer, either.  All I care about is whether 'np' is
> equal to dma_channel_np.  I'm not going to use 'np'.  So I think the real fix is
> this:
> 
> @@ -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);
> +		of_node_put(np);
>  		if (np == dma_channel_np)
>  			return ssi_np;
> 
>  		np = of_parse_phandle(ssi_np, "fsl,capture-dma", 0);
> +		of_node_put(np);
>  		if (np == dma_channel_np)
>  			return ssi_np;
>  	}
> 
>  	return NULL;

OK, that looks reasonable.

julia
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