[PATCH]AMD IOV: Fix xen start up bug on non-iommu machine

[PATCH]AMD IOV: Fix xen start up bug on non-iommu machine

[Wei Wang2]

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Keir,
This patch fixes a Xen start up bug on non-iommu machine.

Signed-off-by: Wei Wang <wei.wang2@amd.com>
-- 
AMD Saxony, Dresden, Germany
Operating System Research Center

Legal Information:
AMD Saxony Limited Liability Company & Co. KG
Sitz (Geschäftsanschrift):
   Wilschdorfer Landstr. 101, 01109 Dresden, Deutschland
Registergericht Dresden: HRA 4896
vertretungsberechtigter Komplementär:
   AMD Saxony LLC (Sitz Wilmington, Delaware, USA)
Geschäftsführer der AMD Saxony LLC:
   Dr. Hans-R. Deppe, Thomas McCoy 

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diff -r 491074885dcb xen/drivers/passthrough/amd/iommu_detect.c
--- a/xen/drivers/passthrough/amd/iommu_detect.c	Mon Apr 21 12:23:55 2008 +0100
+++ b/xen/drivers/passthrough/amd/iommu_detect.c	Mon Apr 21 15:07:03 2008 +0200
@@ -220,9 +220,8 @@ static int __init scan_functions_for_iom
 
     func = 0;
     count = 1;
-    while ( VALID_PCI_VENDOR_ID(pci_conf_read16(bus, dev, func,
-                                                PCI_VENDOR_ID)) &&
-            !error && (func < count) )
+    while ( (func < count) && !error &&
+        VALID_PCI_VENDOR_ID(pci_conf_read16(bus, dev, func, PCI_VENDOR_ID)) )
     {
         hdr_type = pci_conf_read8(bus, dev, func, PCI_HEADER_TYPE);
 

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