1 files changed, 1 insertions, 1 deletions

diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c
index 8e9e06a7ca59..4f2680f431b5 100644
--- a/arch/powerpc/sysdev/dart_iommu.c
+++ b/arch/powerpc/sysdev/dart_iommu.c
@@ -239,7 +239,7 @@ static int __init dart_init(struct device_node *dart_node)
                                          DARTMAP_RPNMASK);
 
         /* Map in DART registers */
-        dart = ioremap(r.start, r.end - r.start + 1);
+        dart = ioremap(r.start, resource_size(&r));
         if (dart == NULL)
                 panic("DART: Cannot map registers!");