linux-kernel - Re: [PATCH RESEND 3/7] watchdog: mv64x60_wdt: use devm

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Message-id: <000501ce4545$f43495f0$dc9dc1d0$@samsung.com>
Date:	Tue, 30 Apr 2013 10:56:39 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Guenter Roeck' <linux@...ck-us.net>
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, 'Wim Van Sebroeck' <wim@...ana.be>,
	linux-watchdog@...r.kernel.org, Jingoo Han <jg1.han@...sung.com>
Subject: Re: [PATCH RESEND 3/7] watchdog: mv64x60_wdt: use devm_ioremap()

On Tuesday, April 30, 2013 2:55 AM, Guenter Roeck wrote:
> On Mon, Apr 29, 2013 at 06:35:15PM +0900, Jingoo Han wrote:
> > Use devm_ioremap() to make cleanup paths simpler.
> >
> > Signed-off-by: Jingoo Han <jg1.han@...sung.com>
> 
> This patch also addresses the missing call to iounmap() if the call
> to misc_register fails.

When devm_ioremap() is used, there is no need to call devm_iounmap().

It is because, these resource managed functions such as
devm_ioremap() allow the driver core to automatically
clean up any allocation, when probe function fails.

> 
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>

Thank you for your reviewing.

Best regards,
Jingoo Han

> 
> > ---
> >  drivers/watchdog/mv64x60_wdt.c |    4 +---
> >  1 files changed, 1 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/watchdog/mv64x60_wdt.c b/drivers/watchdog/mv64x60_wdt.c
> > index c7fb878..e4cf980 100644
> > --- a/drivers/watchdog/mv64x60_wdt.c
> > +++ b/drivers/watchdog/mv64x60_wdt.c
> > @@ -276,7 +276,7 @@ static int mv64x60_wdt_probe(struct platform_device *dev)
> >  	if (!r)
> >  		return -ENODEV;
> >
> > -	mv64x60_wdt_regs = ioremap(r->start, resource_size(r));
> > +	mv64x60_wdt_regs = devm_ioremap(&dev->dev, r->start, resource_size(r));
> >  	if (mv64x60_wdt_regs == NULL)
> >  		return -ENOMEM;
> >
> > @@ -293,8 +293,6 @@ static int mv64x60_wdt_remove(struct platform_device *dev)
> >
> >  	mv64x60_wdt_handler_disable();
> >
> > -	iounmap(mv64x60_wdt_regs);
> > -
> >  	return 0;
> >  }
> >
> > --
> > 1.7.2.5
> >
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >

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