X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=drivers%2Frtc%2Frtc-s3c.c;h=e0d7b9991505564c412e4771f8061154c5adc449;hb=db616eb67604242c11bfbb331bb143bfe4a2e386;hp=7a568beba3f00b95f483664b03d888fc76059877;hpb=590cf28580c999c8ba70dc39b40bab09d69e2630;p=karo-tx-linux.git

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;