From 83c0f0e8303468ca56c7e8b25f4c19af3706a6d7 Mon Sep 17 00:00:00 2001
From: Sheng Yang <sheng@linux.intel.com>
Date: Wed, 8 Jul 2009 11:52:52 +0100
Subject: [PATCH] --- yaml --- r: 155095 b: refs/heads/master c:
 4b99d3527041bec1abe9903263a3a1b7d2ba0c4a h: refs/heads/master i:   155093:
 f0bee56c1fad5022e5ba3d89693eec80afafb225   155091:
 f3bc6315071544bbf107cc38e4c503585463d85d   155087:
 b9a6a953656ae2727ee80f38c0e3fdc9da3c7c23 v: v3

---
 [refs]                          | 2 +-
 trunk/drivers/pci/intel-iommu.c | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index ac7f9be5c186..e45165f02ebd 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 0f2f2221b4ad816567394a52643963428fd353cd
+refs/heads/master: 4b99d3527041bec1abe9903263a3a1b7d2ba0c4a
diff --git a/trunk/drivers/pci/intel-iommu.c b/trunk/drivers/pci/intel-iommu.c
index 360fb67a30d7..ebc9b8dca881 100644
--- a/trunk/drivers/pci/intel-iommu.c
+++ b/trunk/drivers/pci/intel-iommu.c
@@ -3600,6 +3600,9 @@ static void intel_iommu_unmap_range(struct iommu_domain *domain,
 {
 	struct dmar_domain *dmar_domain = domain->priv;
 
+	if (!size)
+		return;
+
 	dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT,
 			    (iova + size - 1) >> VTD_PAGE_SHIFT);