1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/rtc/rtc-mrst.c b/drivers/rtc/rtc-mrst.c
index 0cec5650d56a..d33544802a2e 100644
--- a/drivers/rtc/rtc-mrst.c
+++ b/drivers/rtc/rtc-mrst.c
@@ -332,9 +332,8 @@ vrtc_mrst_do_probe(struct device *dev, struct resource *iomem, int rtc_irq)
         if (!iomem)
                 return -ENODEV;
 
-        iomem = request_mem_region(iomem->start,
-                        iomem->end + 1 - iomem->start,
-                        driver_name);
+        iomem = request_mem_region(iomem->start, resource_size(iomem),
+                                   driver_name);
         if (!iomem) {
                 dev_dbg(dev, "i/o mem already in use.\n");
                 return -EBUSY;