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Date: Wed, 23 Feb 2011 10:08:10 +0000
From: "Jan Beulich" <JBeulich@novell.com>
To: "Jesse Barnes" <jbarnes@virtuousgeek.org>
Cc: <mingo@elte.hu>, <tglx@linutronix.de>, <mchehab@redhat.com>,
	<linux-pci@vger.kernel.org>, <hpa@zytor.com>
Subject: [PATCH] x86/pci: derive pcibios_last_bus from ACPI MCFG
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--- 2.6.38-rc6/arch/x86/pci/mmconfig-shared.c
+++ 2.6.38-rc6-x86-mmconfig-last-bus/arch/x86/pci/mmconfig-shared.c
@@ -606,6 +606,16 @@ static void __init __pci_mmcfg_init(int 
 	if (list_empty(&pci_mmcfg_list))
 		return;
 
+	if (pcibios_last_bus < 0) {
+		const struct pci_mmcfg_region *cfg;
+
+		list_for_each_entry(cfg, &pci_mmcfg_list, list) {
+			if (cfg->segment)
+				break;
+			pcibios_last_bus = cfg->end_bus;
+		}
+	}
+
 	if (pci_mmcfg_arch_init())
 		pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
 	else {