1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 7a568beba3f0..e0d7b9991505 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -94,6 +94,9 @@ static int s3c_rtc_setfreq(struct device *dev, int freq)
 {
         unsigned int tmp;
 
+        if (!is_power_of_2(freq))
+                return -EINVAL;
+
         spin_lock_irq(&s3c_rtc_pie_lock);
 
         tmp = readb(s3c_rtc_base + S3C2410_TICNT) & S3C2410_TICNT_ENABLE;