linux-kernel - [PATCH] x86/pci: don't use crs for root if we only have one root bus

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Message-ID: <4A42AFAC.6000300@kernel.org>
Date:	Wed, 24 Jun 2009 15:58:52 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Gary Hade <garyhade@...ibm.com>,
	Matthew Wilcox <matthew@....cx>,
	Larry Finger <Larry.Finger@...inger.net>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pci@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jaswinder Singh Rajput <jaswinder@...nel.org>
Subject: [PATCH] x86/pci: don't use crs for root if we only have one root
 bus


for AMD system, when only one PCI root, just set PCI_NO_ROOT_CRS for it

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/pci/amd_bus.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-2.6/arch/x86/pci/amd_bus.c
===================================================================
--- linux-2.6.orig/arch/x86/pci/amd_bus.c
+++ linux-2.6/arch/x86/pci/amd_bus.c
@@ -561,6 +561,10 @@ static int __init early_fill_mp_bus_info
 		}
 	}
 
+	/* don't use _CRS if we only have one root */
+	if (pci_root_num <= 1)
+		pci_probe |= PCI_NO_ROOT_CRS;
+
 	return 0;
 }
 
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