linux-kernel - Re: [Regression] PCI resources allocation problem on HP nx6325

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Date:	Tue, 11 Aug 2009 18:47:40 +0200
From:	Manuel Lauss <mano@...rinelk.homelinux.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Wilcox <willy@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrew Patterson <andrew.patterson@...com>
Subject: Re: [Regression] PCI resources allocation problem on HP nx6325

On Fri, 7 Aug 2009 11:40:19 -0700 (PDT)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

[explanation snipped]

> So this patch is not something that I'm going to apply to my tree, but 
> it's worth testing out to just verify that yes, I finally understand 
> exactly what's going on. Because if I'm right, your warning will now go 
> away (and it could be replaced by _other_ issues, of course ;).


> ---
>  drivers/pci/pci.c |    8 ++++++--
>  1 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index dbd0f94..89efbb5 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -367,8 +367,12 @@ pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
>  			continue;	/* Wrong type */
>  		if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH))
>  			return r;	/* Exact match */
> -		if ((res->flags & IORESOURCE_PREFETCH) && !(r->flags & IORESOURCE_PREFETCH))
> -			best = r;	/* Approximating prefetchable by non-prefetchable */
> +		/* We can't insert a non-prefetch resource inside a prefetchable parent .. */
> +		if (r->flags & IORESOURCE_PREFETCH)
> +			continue;
> +		/* .. but we can put a prefetchable resource inside a non-prefetchable one */
> +		if (!best)
> +			best = r;
>  	}
>  	return best;
>  }


The warning is gone, and /proc/iomem is identical to 2.6.30.
I'd say you've hit the nail on the head ;)

Thanks!
	Manuel Lauss
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