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path: root/drivers/rtc/rtc-sh.c
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Diffstat (limited to 'drivers/rtc/rtc-sh.c')
-rw-r--r--drivers/rtc/rtc-sh.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-sh.c b/drivers/rtc/rtc-sh.c
index 5ed66acf8ca..1c3fc6b428e 100644
--- a/drivers/rtc/rtc-sh.c
+++ b/drivers/rtc/rtc-sh.c
@@ -24,6 +24,7 @@
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>
+#include <linux/log2.h>
#include <asm/rtc.h>
#define DRV_NAME "sh-rtc"
@@ -551,6 +552,8 @@ static int sh_rtc_irq_set_state(struct device *dev, int enabled)
static int sh_rtc_irq_set_freq(struct device *dev, int freq)
{
+ if (!is_power_of_2(freq))
+ return -EINVAL;
return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
}