1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index e8c33a302006..726494b58345 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -1553,7 +1553,7 @@ static void __init calgary_fixup_one_tce_space(struct pci_dev *dev)
                         continue;
 
                 /* cover the whole region */
-                npages = (r->end - r->start) >> PAGE_SHIFT;
+                npages = resource_size(r) >> PAGE_SHIFT;
                 npages++;
 
                 iommu_range_reserve(tbl, r->start, npages);