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Message-ID: <4B27D7E9.4030105@kernel.org>
Date: Tue, 15 Dec 2009 10:39:37 -0800
From: Yinghai Lu <yinghai@kernel.org>
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To: Jens Axboe <jens.axboe@oracle.com>,
	Jesse Barnes <jbarnes@virtuousgeek.org>
CC: Linux Kernel <linux-kernel@vger.kernel.org>, mingo@elte.hu,
	rdreier@cisco.com, Suresh Siddha <suresh.b.siddha@intel.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
Subject: Re: kexec boot regression
References: <20091215115052.GA28252@kernel.dk> <4B277AB2.8030107@kernel.org>
	<20091215121436.GB28252@kernel.dk> <4B2781AC.8020301@kernel.org>
	<20091215123951.GD28252@kernel.dk> <4B278734.2040704@kernel.org>
	<20091215141105.GK28252@kernel.dk>
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Index: linux-2.6/arch/x86/pci/intel_bus.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/intel_bus.c
+++ linux-2.6/arch/x86/pci/intel_bus.c
@@ -49,6 +49,10 @@ static void __devinit pci_root_bus_res(s
 	u64 mmioh_base, mmioh_end;
 	int bus_base, bus_end;
 
+	/* some sys doesn't get mmconf enabled */
+	if (dev->cfg_size < 0x200)
+		return;
+
 	if (pci_root_num >= PCI_ROOT_NR) {
 		printk(KERN_DEBUG "intel_bus.c: PCI_ROOT_NR is too small\n");
 		return;