1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 16512ecae31a..2a65e85e0f56 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -455,8 +455,7 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
                 return -ENOENT;
         }
 
-        s3c_rtc_mem = request_mem_region(res->start,
-                                         res->end-res->start+1,
+        s3c_rtc_mem = request_mem_region(res->start, resource_size(res),
                                          pdev->name);
 
         if (s3c_rtc_mem == NULL) {
@@ -465,7 +464,7 @@ static int __devinit s3c_rtc_probe(struct platform_device *pdev)
                 goto err_nores;
         }
 
-        s3c_rtc_base = ioremap(res->start, res->end - res->start + 1);
+        s3c_rtc_base = ioremap(res->start, resource_size(res));
         if (s3c_rtc_base == NULL) {
                 dev_err(&pdev->dev, "failed ioremap()\n");
                 ret = -EINVAL;