linux-kernel - Re: [PATCH v2] rtc: davinci: clean up probe/remove routines

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Date:	Sun, 14 Oct 2012 16:18:55 +0300
From:	Hannu Heikkinen <hannuxx@....fi>
To:	Sekhar Nori <nsekhar@...com>
Cc:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	a.zummo@...ertech.it,
	davinci-linux-open-source@...ux.davincidsp.com
Subject: Re: [PATCH v2] rtc: davinci: clean up probe/remove routines

On 14/10/12 18:06 +0530, Sekhar Nori wrote:
> On 10/14/2012 3:13 PM, Hannu Heikkinen wrote:
> > Use the devres managed resource functions in the probe routine.
> > Also affects the remove routine where the previously used free and
> > release functions are not needed.
> > 
> > The devm_* functions eliminate the need for manual resource releasing and
> > simplify error handling.  Resources allocated by devm_* are freed
> > automatically on driver detach.
> > 
> > Signed-off-by: Hannu Heikkinen <hannuxx@....fi>
> > ---
> >  drivers/rtc/rtc-davinci.c | 56 +++++++++++++----------------------------------
> >  1 file changed, 15 insertions(+), 41 deletions(-)
> > 
> > diff --git a/drivers/rtc/rtc-davinci.c b/drivers/rtc/rtc-davinci.c
> > index 14c2109..d24b573 100644
> > --- a/drivers/rtc/rtc-davinci.c
> > +++ b/drivers/rtc/rtc-davinci.c
> > @@ -119,8 +119,6 @@ static DEFINE_SPINLOCK(davinci_rtc_lock);
> >  struct davinci_rtc {
> >  	struct rtc_device 		*rtc;
> >  	void __iomem			*base;
> > -	resource_size_t			pbase;
> > -	size_t				base_size;
> >  	int				irq;
> >  };
> >  
> > @@ -482,22 +480,16 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
> >  {
> >  	struct device *dev = &pdev->dev;
> >  	struct davinci_rtc *davinci_rtc;
> > -	struct resource *res, *mem;
> > +	struct resource *res;
> >  	int ret = 0;
> >  
> > -	davinci_rtc = kzalloc(sizeof(struct davinci_rtc), GFP_KERNEL);
> > +	davinci_rtc = devm_kzalloc(&pdev->dev, sizeof(struct davinci_rtc),
> > +		GFP_KERNEL);
> >  	if (!davinci_rtc) {
> >  		dev_dbg(dev, "could not allocate memory for private data\n");
> >  		return -ENOMEM;
> >  	}
> >  
> > -	davinci_rtc->irq = platform_get_irq(pdev, 0);
> > -	if (davinci_rtc->irq < 0) {
> > -		dev_err(dev, "no RTC irq\n");
> > -		ret = davinci_rtc->irq;
> > -		goto fail1;
> > -	}
> > -
> >  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >  	if (!res) {
> >  		dev_err(dev, "no mem resource\n");
> > @@ -505,23 +497,16 @@ static int __init davinci_rtc_probe(struct platform_device *pdev)
> >  		goto fail1;
> 
> As mentioned last time, this will have a build break here because fail1
> is being removed down below.
> 
> Thanks,
> Sekhar

I'm sorry, did not spot that line before. Will fix.

br,
Hannu


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