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);