linux-kernel - Re: [PATCH 1/8] arch/mips/txx9: introduce missing kfree, iounmap

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Date:	Sun, 13 Sep 2009 17:14:06 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	ralf@...ux-mips.org, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/8] arch/mips/txx9: introduce missing kfree, iounmap

On Sun, 13 Sep 2009, Atsushi Nemoto wrote:

> On Fri, 11 Sep 2009 18:21:00 +0200 (CEST), Julia Lawall <julia@...u.dk> wrote:
> > From: Julia Lawall <julia@...u.dk>
> > 
> > Error handling code following a kzalloc should free the allocated data.
> > Error handling code following an ioremap should iounmap the allocated data.
> > 
> > The semantic match that finds the first problem is as follows:
> > (http://www.emn.fr/x-info/coccinelle/)
> 
> Thank you for finding this out.
> 
> This patch add some correctness, but obviously incomplete: there are
> more error pathes without iounmap/kfree/etc. in this function.

The only other error path that I see is:

       pdev = platform_device_alloc("leds-gpio", basenum);
        if (!pdev)
                return;

But at that point the call gpiochip_add(&iocled->chip) has already 
succeeded.  From looking at this function, I have the impression that it 
makes the iocled structure available from a global array, gpio_desc.  
Since the function containing the above code doesn't return any error 
code, perhaps the caller will not know whether this platform_device_alloc 
error occurred or not.  There would also be at least the problem of 
getting the pointer out of the gpio_desc structure.  I guess this could be 
done with gpiochip_remove?

I can certainly make a new patch using the goto style, but let me know 
what to do about the above issue.

thanks,
julia

> And I like goto-style cleanup, as Mark Brown said in reply for your
> sound/soc patch.
> 
> Could you make a new patch?
> 
> ---
> Atsushi Nemoto
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