[Xen-changelog] [xen-unstable] VT-d: ensure zapping ACPI DMAR signature in acpi_parse_dmar

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1265917738 0
# Node ID 8616a82df1c08064634e47875db1303c1fb231b5
# Parent  b4ad00da6960a499774f1e962a1e081ab7c1c997
VT-d: ensure zapping ACPI DMAR signature in acpi_parse_dmar

VT-d is owned by Xen hypervisor. Xen zaps ACPI DMAR signature to
prevent dom0 to use VT-d. This patch changes the direct return when
DMAR width is zero, instead zaps ACPI DMAR signature before return.

Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/dmar.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -r b4ad00da6960 -r 8616a82df1c0 xen/drivers/passthrough/vtd/dmar.c
--- a/xen/drivers/passthrough/vtd/dmar.c        Wed Feb 10 13:30:57 2010 +0000
+++ b/xen/drivers/passthrough/vtd/dmar.c        Thu Feb 11 19:48:58 2010 +0000
@@ -623,7 +623,8 @@ static int __init acpi_parse_dmar(struct
     if ( !dmar->width )
     {
         dprintk(XENLOG_WARNING VTDPREFIX, "Zero: Invalid DMAR width\n");
-        return -EINVAL;
+        ret = -EINVAL;
+        goto out;
     }
 
     dmar_host_address_width = dmar->width + 1;

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