tree 899b6ad085c237f6b190b1b68aaffcb3d0432943
parent 75be612c1e28d413e25f2acafb1754e9be7b5f90
author Rasmus Villemoes <linux@rasmusvillemoes.dk> 1565615636 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1571344927 -0700

watchdog: imx2_wdt: fix min() calculation in imx2_wdt_set_timeout

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>