From: Rasmus Villemoes linux@rasmusvillemoes.dk
commit 144783a80cd2cbc45c6ce17db649140b65f203dd upstream.
Converting from ms to s requires dividing by 1000, not multiplying. So this is currently taking the smaller of new_timeout and 1.28e8, i.e. effectively new_timeout.
The driver knows what it set max_hw_heartbeat_ms to, so use that value instead of doing a division at run-time.
FWIW, this can easily be tested by booting into a busybox shell and doing "watchdog -t 5 -T 130 /dev/watchdog" - without this patch, the watchdog fires after 130&127 == 2 seconds.
Fixes: b07e228eee69 "watchdog: imx2_wdt: Fix set_timeout for big timeout values" Cc: stable@vger.kernel.org # 5.2 plus anything the above got backported to Signed-off-by: Rasmus Villemoes linux@rasmusvillemoes.dk Reviewed-by: Guenter Roeck linux@roeck-us.net Link: https://lore.kernel.org/r/20190812131356.23039-1-linux@rasmusvillemoes.dk Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Wim Van Sebroeck wim@linux-watchdog.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/watchdog/imx2_wdt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/watchdog/imx2_wdt.c +++ b/drivers/watchdog/imx2_wdt.c @@ -58,7 +58,7 @@
#define IMX2_WDT_WMCR 0x08 /* Misc Register */
-#define IMX2_WDT_MAX_TIME 128 +#define IMX2_WDT_MAX_TIME 128U #define IMX2_WDT_DEFAULT_TIME 60 /* in seconds */
#define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8) @@ -183,7 +183,7 @@ static int imx2_wdt_set_timeout(struct w { unsigned int actual;
- actual = min(new_timeout, wdog->max_hw_heartbeat_ms * 1000); + actual = min(new_timeout, IMX2_WDT_MAX_TIME); __imx2_wdt_set_timeout(wdog, actual); wdog->timeout = new_timeout; return 0;