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-rw-r--r--include/linux/dio.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/dio.h b/include/linux/dio.h
index b2dd31ca1710..2cc0fd00463f 100644
--- a/include/linux/dio.h
+++ b/include/linux/dio.h
@@ -254,7 +254,7 @@ static inline struct dio_driver *dio_dev_driver(const struct dio_dev *d)
#define dio_resource_start(d) ((d)->resource.start)
#define dio_resource_end(d) ((d)->resource.end)
-#define dio_resource_len(d) ((d)->resource.end-(d)->resource.start+1)
+#define dio_resource_len(d) (resource_size(&(d)->resource))
#define dio_resource_flags(d) ((d)->resource.flags)
#define dio_request_device(d, name) \
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