From: Keir Fraser <keir.fraser@citrix.com>
Date: Fri, 11 Apr 2008 08:12:56 +0000 (+0100)
Subject: VT-d: DMAR device scope parse fixup
X-Git-Tag: 3.3.0-rc1~243^2~22
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=5bb8a6fad8814dc597bc7c37df46aac98c9300ff;p=xen.git

VT-d: DMAR device scope parse fixup

Previously applied sanity check fixup is incorrect.

Signed-off-by: Espen Skoglund <espen.skoglund@netronome.com>
---

diff --git a/xen/drivers/passthrough/vtd/dmar.c b/xen/drivers/passthrough/vtd/dmar.c
index 19d5675a1b..0685d84010 100644
--- a/xen/drivers/passthrough/vtd/dmar.c
+++ b/xen/drivers/passthrough/vtd/dmar.c
@@ -231,7 +231,7 @@ static int scope_device_count(void *start, void *end)
         bus = scope->start_bus;
         depth = (scope->length - sizeof(struct acpi_dev_scope))
 		    / sizeof(struct acpi_pci_path);
-        while ( --depth >= 0 )
+        while ( --depth > 0 )
         {
             bus = read_pci_config_byte(
                 bus, path->dev, path->fn, PCI_SECONDARY_BUS);
@@ -353,7 +353,7 @@ static int __init acpi_parse_dev_scope(
 		    / sizeof(struct acpi_pci_path);
         bus = scope->start_bus;
 
-        while ( --depth >= 0 )
+        while ( --depth > 0 )
         {
             bus = read_pci_config_byte(
                 bus, path->dev, path->fn, PCI_SECONDARY_BUS);