[Xen-changelog] [xen-unstable] iommu: clear the iommu_* variables to 0 when iommu is not enabled.

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1268294998 0
# Node ID 5b8e012641e21b3f62350b707fe1e52557f17829
# Parent  d3720d9511739fc009aad2076e77e9437c175d07
iommu: clear the iommu_* variables to 0 when iommu is not enabled.

With "iommu=0" xen parameter, the 3 iommu_* variables are still left
to the default value 1 -- this is misleading...

Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>
---
 xen/drivers/passthrough/iommu.c |    5 +++++
 1 files changed, 5 insertions(+)

diff -r d3720d951173 -r 5b8e012641e2 xen/drivers/passthrough/iommu.c
--- a/xen/drivers/passthrough/iommu.c   Thu Mar 11 08:09:37 2010 +0000
+++ b/xen/drivers/passthrough/iommu.c   Thu Mar 11 08:09:58 2010 +0000
@@ -288,7 +288,12 @@ int iommu_setup(void)
         panic("IOMMU setup failed, crash Xen for security purpose!\n");
 
     if ( !iommu_enabled )
+    {
         iommu_pv_enabled = 0;
+        iommu_snoop = 0;
+        iommu_qinval = 0;
+        iommu_intremap = 0;
+    }
     printk("I/O virtualisation %sabled\n", iommu_enabled ? "en" : "dis");
     if ( iommu_enabled )
         printk("I/O virtualisation for PV guests %sabled\n",

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