linux-kernel - Re: [PATCH] x86: check boundary in count/setup_resource called by get_current

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Message-ID: <20071101201040.GA22247@us.ibm.com>
Date:	Thu, 1 Nov 2007 13:10:40 -0700
From:	Gary Hade <garyhade@...ibm.com>
To:	Yinghai Lu <Yinghai.Lu@....COM>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Gary Hade <garyhade@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH] x86: check boundary in count/setup_resource called by get_current_resources

On Thu, Nov 01, 2007 at 11:06:18AM -0700, Yinghai Lu wrote:
> Andrew Morton wrote:
> >On Thu, 01 Nov 2007 01:20:29 -0700 Yinghai Lu <Yinghai.Lu@....COM> wrote:
> >
> >>[PATCH] x86: check boundary in count/setup_resource called by 
> >>get_current_resources
> >>
> >>need to check info->res_num less than PCI_BUS_NUM_RESOURCES, so
> >>info->bus->resource[info->res_num] = res will not beyond of bus resource 
> >>array
> >>when acpi resutrn too many resource entries.
> >>
> >
> >Isn't this a bit of a problem?  It sounds like PCI_BUS_NUM_RESOURCES is to
> >small for that system?  If so, some sort of dynamic allocation might be
> >needed.
> 
> sound reasonable...
> i have one local patch for amd64 that will get resources from pci conf. and 
> it will use all 8 slots for bus 0.
> and transparent bus under it only can copy 5 of them.

Yea, with the current fixed size pci_bus resource array
I believe you would need to increase PCI_BUS_NUM_RESOURCES
from 8 to 11 for the transparent bridge child bus to get
all 8 _CRS returned resources.

Gary

-- 
Gary Hade
System x Enablement
IBM Linux Technology Center
503-578-4503  IBM T/L: 775-4503
garyhade@...ibm.com
http://www.ibm.com/linux/ltc
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