linux-kernel - RE: [PATCH 1/3] sound/soc/mxs/mxs-saif.c: keep pointer to resource so it can be freed

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Date:	Tue, 18 Oct 2011 15:06:38 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Dong Aisheng-B29396 <B29396@...escale.com>
Cc:	Liam Girdwood <lrg@...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>,
	Wolfram Sang <w.sang@...gutronix.de>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/3] sound/soc/mxs/mxs-saif.c: keep pointer to resource
 so it can be freed

On Tue, 18 Oct 2011, Dong Aisheng-B29396 wrote:

> > -----Original Message-----
> > From: Julia Lawall [mailto:julia@...u.dk]
> > Sent: Tuesday, October 18, 2011 11:46 AM
> > To: Liam Girdwood
> > Cc: kernel-janitors@...r.kernel.org; Mark Brown; Jaroslav Kysela; Takashi
> > Iwai; Dong Aisheng-B29396; Wolfram Sang; alsa-devel@...a-project.org;
> > linux-kernel@...r.kernel.org
> > Subject: [PATCH 1/3] sound/soc/mxs/mxs-saif.c: keep pointer to resource
> > so it can be freed
> > 
> > From: Julia Lawall <julia@...u.dk>
> > 
> > Add a new variable for storing resources accessed subsequent to the one
> > accessed using request_mem_region, so the one accessed using
> > request_mem_region can be released if needed.
> > 
> > The semantic match that finds this problem is as follows:
> > (http://coccinelle.lip6.fr/)
> > 
> > // <smpl>
> > @r@
> > expression E, E1;
> > identifier f;
> > statement S1,S2,S3;
> > @@
> > 
> > if (E == NULL)
> > {
> >   ... when != if (E == NULL || ...) S1 else S2
> >       when != E = E1
> > *E->f
> >   ... when any
> >   return ...;
> > }
> > else S3
> > // </smpl>
> > 
> > Signed-off-by: Julia Lawall <julia@...u.dk>
> > 
> > ---
> >  sound/soc/mxs/mxs-saif.c |    8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c index
> > 401944c..e12ff78 100644
> > --- a/sound/soc/mxs/mxs-saif.c
> > +++ b/sound/soc/mxs/mxs-saif.c
> > @@ -617,7 +617,7 @@ static irqreturn_t mxs_saif_irq(int irq, void *dev_id)
> > 
> >  static int mxs_saif_probe(struct platform_device *pdev)  {
> > -	struct resource *res;
> > +	struct resource *res, *res1;
> How about naming iores and dmares?

Sure. I will change that.

thanks,
julia

> 
> >  	struct mxs_saif *saif;
> >  	struct mxs_saif_platform_data *pdata;
> >  	int ret = 0;
> > @@ -676,14 +676,14 @@ static int mxs_saif_probe(struct platform_device
> > *pdev)
> >  		goto failed_ioremap;
> >  	}
> > 
> > -	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
> > -	if (!res) {
> > +	res1 = platform_get_resource(pdev, IORESOURCE_DMA, 0);
> > +	if (!res1) {
> >  		ret = -ENODEV;
> >  		dev_err(&pdev->dev, "failed to get dma resource: %d\n",
> >  			ret);
> >  		goto failed_ioremap;
> >  	}
> > -	saif->dma_param.chan_num = res->start;
> > +	saif->dma_param.chan_num = res1->start;
> > 
> >  	saif->irq = platform_get_irq(pdev, 0);
> >  	if (saif->irq < 0) {
> > 
> 
> Regards
> Dong Aisheng
> 
> --
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