lguest: fix comment style

[firefly-linux-kernel-4.4.55.git] / drivers / pci / intel-iommu.c

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 360fb67a30d7ab40872829ca6a36a02bdcee9d31..ebc9b8dca881f588e974fbcb60faabf9642902f8 100644 (file)
--- a/drivers/pci/intel-iommu.c
+++ b/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);