1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/rtc/rtc-ds1511.c b/drivers/rtc/rtc-ds1511.c
index fbabc773dded..586c244a05d8 100644
--- a/drivers/rtc/rtc-ds1511.c
+++ b/drivers/rtc/rtc-ds1511.c
@@ -23,6 +23,7 @@
 #include <linux/rtc.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
+#include <linux/module.h>
 
 #define DRV_VERSION "0.6"
 
@@ -490,7 +491,7 @@ ds1511_rtc_probe(struct platform_device *pdev)
         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
         if (!pdata)
                 return -ENOMEM;
-        pdata->size = res->end - res->start + 1;
+        pdata->size = resource_size(res);
         if (!devm_request_mem_region(&pdev->dev, res->start, pdata->size,
                         pdev->name))
                 return -EBUSY;