linux-kernel - Re: [PATCH 1/4] ASoC: simple-card: Fix device node locks

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Message-ID: <20140225083056.7bfb35f6@armhf>
Date:	Tue, 25 Feb 2014 08:30:56 +0100
From:	Jean-Francois Moine <moinejf@...e.fr>
To:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
Cc:	Mark Brown <broonie@...nel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"Kuninori Morimoto" <kuninori.morimoto.gx@...esas.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/4] ASoC: simple-card: Fix device node locks

On Mon, 24 Feb 2014 02:17:00 +0000
"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com> wrote:

> > @@ -169,22 +164,26 @@ static int asoc_simple_card_parse_of(struct device_node
> > *node,
> >  	/* CPU sub-node */
> >  	ret = -EINVAL;
> >  	np = of_get_child_by_name(node, "simple-audio-card,cpu");
> > -	if (np)
> > +	if (np) {
> >  		ret = asoc_simple_card_sub_parse_of(np, priv->daifmt,
> >  						  &priv->cpu_dai,
> >  						  &dai_link->cpu_of_node,
> >  						  &dai_link->cpu_dai_name);
> > +		of_node_put(np);
> 
> Does the of_node_put(np) is really needed here ?
	[snip]

Yes, of_get_child_by_name() increments the node refcount and np is not
used afterwards.

But, you are right, this creates a bug in the next patch when using
of_get_next_child(). I will fix it.

Thanks.

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/
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