linux-kernel - Re: [PATCH 5/5] ioremap balanced with iounmap for drivers/char/watchdog/s3c2410

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Message-ID: <20061112132849.GA29674@home.fluff.org>
Date:	Sun, 12 Nov 2006 13:28:49 +0000
From:	Ben Dooks <ben-linux@...ff.org>
To:	Andrew Morton <akpm@...l.org>
Cc:	Amol Lad <amol@...ismonetworks.com>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Wim Coekaerts <wim.coekaerts@...cle.com>
Subject: Re: [PATCH 5/5] ioremap balanced with iounmap for drivers/char/watchdog/s3c2410_wdt.c

On Fri, Oct 06, 2006 at 01:40:20PM -0700, Andrew Morton wrote:
> On Fri, 06 Oct 2006 10:27:07 +0530
> Amol Lad <amol@...ismonetworks.com> wrote:
> 
> > Signed-off-by: Amol Lad <amol@...ismonetworks.com>
> > ---
> >  s3c2410_wdt.c |    5 +++++
> >  1 files changed, 5 insertions(+)
> > ---
> > diff -uprN -X linux-2.6.19-rc1-orig/Documentation/dontdiff linux-2.6.19-rc1-orig/drivers/char/watchdog/s3c2410_wdt.c linux-2.6.19-rc1/drivers/char/watchdog/s3c2410_wdt.c
> > --- linux-2.6.19-rc1-orig/drivers/char/watchdog/s3c2410_wdt.c	2006-10-05 14:00:43.000000000 +0530
> > +++ linux-2.6.19-rc1/drivers/char/watchdog/s3c2410_wdt.c	2006-10-05 14:50:00.000000000 +0530
> > @@ -381,18 +381,21 @@ static int s3c2410wdt_probe(struct platf
> >  	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> >  	if (res == NULL) {
> >  		printk(KERN_INFO PFX "failed to get irq resource\n");
> > +		iounmap(wdt_base);
> >  		return -ENOENT;
> >  	}
> >  
> >  	ret = request_irq(res->start, s3c2410wdt_irq, 0, pdev->name, pdev);
> >  	if (ret != 0) {
> >  		printk(KERN_INFO PFX "failed to install irq (%d)\n", ret);
> > +		iounmap(wdt_base);
> >  		return ret;
> >  	}
> >  
> >  	wdt_clock = clk_get(&pdev->dev, "watchdog");
> >  	if (wdt_clock == NULL) {
> >  		printk(KERN_INFO PFX "failed to find watchdog clock source\n");
> > +		iounmap(wdt_base);
> >  		return -ENOENT;
> >  	}
> >  
> > @@ -416,6 +419,7 @@ static int s3c2410wdt_probe(struct platf
> >  	if (ret) {
> >  		printk (KERN_ERR PFX "cannot register miscdev on minor=%d (%d)\n",
> >  			WATCHDOG_MINOR, ret);
> > +		iounmap(wdt_base);
> >  		return ret;
> >  	}
> >  
> 
> barf.  That function has to set the record for the
> number-of-return-statements-per-line.  There are good reasons why we prefer
> to have a single return point at which to handle all the error unwinding,
> and the above patch illustrates one of them.

I'll try and sort this out once 2.6.19 is out.

-- 
Ben (ben@...ff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'
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