Re: [PATCH 2.6.34-rcX] Do not expect PCI devices to return zeroesin PCIe space

[H. Peter Anvin]

On 04/30/2010 07:54 PM, Petr Vandrovec wrote:
> Hello,
>   openSUSE11.3 32bit kernels hang when installed to the VMware's VMs because Moorestown
> fixed capabilities detection code enters endless loop on Intel's AGP bridges (with
> device ID=7191).  See https://bugzilla.kernel.org/show_bug.cgi?id=15888 for additional
> details.  arch/x86/pci/mrst.c was introduced after 2.6.33, so only 2.6.34-rcX are
> affected.
> 				Thanks,
> 					Petr Vandrovec

Hi Petr,

Could you check if this patch fixes your problem, and if so let me know
as soon as possible?

Sorry for the delay.

Thanks,

	-hpa
diff --git a/arch/x86/pci/mrst.c b/arch/x86/pci/mrst.c
index 8bf2fcb..1cdc02c 100644
--- a/arch/x86/pci/mrst.c
+++ b/arch/x86/pci/mrst.c
@@ -247,6 +247,10 @@ static void __devinit pci_fixed_bar_fixup(struct pci_dev *dev)
 	u32 size;
 	int i;
 
+	/* Must have extended configuration space */
+	if (dev->cfg_size < PCIE_CAP_OFFSET + 4)
+		return;
+
 	/* Fixup the BAR sizes for fixed BAR devices and make them unmoveable */
 	offset = fixed_bar_cap(dev->bus, dev->devfn);
 	if (!offset || PCI_DEVFN(2, 0) == dev->devfn ||