diff options
Diffstat (limited to 'drivers/rtc/rtc-cmos.c')
| -rw-r--r-- | drivers/rtc/rtc-cmos.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c index cf98a5d8358e..b6d35f50e404 100644 --- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -35,6 +35,7 @@ #include <linux/spinlock.h> #include <linux/platform_device.h> #include <linux/mod_devicetable.h> +#include <linux/log2.h> /* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */ #include <asm-generic/rtc.h> @@ -384,6 +385,8 @@ static int cmos_irq_set_freq(struct device *dev, int freq) if (!is_valid_irq(cmos->irq)) return -ENXIO; + if (!is_power_of_2(freq)) + return -EINVAL; /* 0 = no irqs; 1 = 2^15 Hz ... 15 = 2^0 Hz */ f = ffs(freq); if (f-- > 16) |