From 07b7d05377a5e2b242ef0cce3d461d3284700fc0 Mon Sep 17 00:00:00 2001
From: Markus Armbruster <armbru@redhat.com>
Date: Thu, 18 Jun 2009 15:14:07 +0200
Subject: [PATCH] Fix do_pci_register_device() to reject devfn already in use

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 hw/pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/pci.c b/hw/pci.c
index 140cdbaa29..da76ecd342 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -267,6 +267,8 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
         }
         return NULL;
     found: ;
+    } else if (bus->devices[devfn]) {
+        return NULL;
     }
     pci_dev->bus = bus;
     pci_dev->devfn = devfn;