diff options
| -rw-r--r-- | drivers/watchdog/s3c2410_wdt.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c index 95f7207e390a..1e8cf0299713 100644 --- a/drivers/watchdog/s3c2410_wdt.c +++ b/drivers/watchdog/s3c2410_wdt.c @@ -27,6 +27,7 @@ #include <linux/mfd/syscon.h> #include <linux/regmap.h> #include <linux/delay.h> +#include <linux/math64.h> #define S3C2410_WTCON 0x00 #define S3C2410_WTDAT 0x04 @@ -410,9 +411,14 @@ static inline unsigned long s3c2410wdt_get_freq(struct s3c2410_wdt *wdt) static inline unsigned int s3c2410wdt_max_timeout(struct s3c2410_wdt *wdt) { const unsigned long freq = s3c2410wdt_get_freq(wdt); + const u64 n_max = (u64)(S3C2410_WTCON_PRESCALE_MAX + 1) * + S3C2410_WTCON_MAXDIV * S3C2410_WTCNT_MAXCNT; + u64 t_max = div64_ul(n_max, freq); - return S3C2410_WTCNT_MAXCNT / (freq / (S3C2410_WTCON_PRESCALE_MAX + 1) - / S3C2410_WTCON_MAXDIV); + if (t_max > UINT_MAX) + t_max = UINT_MAX; + + return t_max; } static int s3c2410wdt_disable_wdt_reset(struct s3c2410_wdt *wdt, bool mask) |