linux-kernel - Re: [-mm patch] pci_iomap_regions error handling fix (was Re: 2.6.20-mm1)

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Message-Id: <20070215155034.7e55921e.akpm@linux-foundation.org>
Date:	Thu, 15 Feb 2007 15:50:34 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Frederik Deweerdt <deweerdt@...e.fr>
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	viro@...iv.linux.org.uk, Tejun Heo <htejun@...il.com>
Subject: Re: [-mm patch] pci_iomap_regions error handling fix (was Re:
 2.6.20-mm1)

On Fri, 16 Feb 2007 16:41:59 +0000
Frederik Deweerdt <deweerdt@...e.fr> wrote:

> On Thu, Feb 15, 2007 at 05:14:08AM -0800, Andrew Morton wrote:
> > 
> > Temporarily at
> > 
> >   http://userweb.kernel.org/~akpm/2.6.20-mm1/
> > 
> Hi,
> 
> It appears that the pcim_iomap_regions() function doesn't get the error
> handling right. It BUGs early at boot with a backtrace along the lines of:
> 
> ahci_init
> pci_register_driver
> driver_register
> [...]
> ahci_init_one
> pcim_iomap_region
> pcim_iounmap
> 
> The following patch allows me to boot. Only the if(mask..) continue;
> part fixes the problem actually, the gotos where changed so that we
> don't try to unmap something we couldn't map anyway.
> 
> Regards,
> Frederik
> 
> Signed-off-by: Frederik Deweerdt <frederik.deweerdt@...il.com>
> 
> 
> diff --git a/lib/devres.c b/lib/devres.c
> index 2a668dd..eb38849 100644
> --- a/lib/devres.c
> +++ b/lib/devres.c
> @@ -274,21 +274,21 @@ int pcim_iomap_regions(struct pci_dev *pdev, u16 mask, const char *name)
>  
>  		rc = pci_request_region(pdev, i, name);
>  		if (rc)
> -			goto err_region;
> +			goto err_inval;
>  
>  		rc = -ENOMEM;
>  		if (!pcim_iomap(pdev, i, 0))
> -			goto err_iomap;
> +			goto err_region;
>  	}
>  
>  	return 0;
>  
> - err_iomap:
> -	pcim_iounmap(pdev, iomap[i]);
>   err_region:
>  	pci_release_region(pdev, i);
>   err_inval:
>  	while (--i >= 0) {
> +		if (!(mask & (1 << i)))
> +			continue;
>  		pcim_iounmap(pdev, iomap[i]);
>  		pci_release_region(pdev, i);
>  	}

yep, the fix looks good and is needed in mainline, thanks.
-
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