--- linux-2.6.3-rc4/arch/x86_64/kernel/pci-gart.c.orig	2004-02-17 15:31:25.000000000 -0500
+++ linux-2.6.3-rc4/arch/x86_64/kernel/pci-gart.c	2004-02-17 15:33:13.000000000 -0500
@@ -521,7 +521,7 @@ void pci_unmap_single(struct pci_dev *hw
 	int npages;
 	int i;
 	if (dma_addr < iommu_bus_base + EMERGENCY_PAGES*PAGE_SIZE || 
-	    dma_addr > iommu_bus_base + iommu_size)
+	    dma_addr >= iommu_bus_base + iommu_size)
 		return;
 	iommu_page = (dma_addr - iommu_bus_base)>>PAGE_SHIFT;	
 	npages = to_pages(dma_addr, size);