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

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Message-Id: <20061006134020.96edb3ff.akpm@osdl.org>
Date:	Fri, 6 Oct 2006 13:40:20 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Amol Lad <amol@...ismonetworks.com>
Cc:	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, 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.

Sigh.  Oh well, patch looks correct - I'll start spamming Wim with it,
thanks.

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