[PATCH 4.14 35/81] watchdog: imx2_wdt: Fix set_timeout for big timeout values

From: Greg Kroah-Hartman
Date: Thu Jun 13 2019 - 12:31:46 EST


[ Upstream commit b07e228eee69601addba98b47b1a3850569e5013 ]

The documentated behavior is: if max_hw_heartbeat_ms is implemented, the
minimum of the set_timeout argument and max_hw_heartbeat_ms should be used.
This patch implements this behavior.
Previously only the first 7bits were used and the input argument was
returned.

Signed-off-by: Georg Hofmann <georg@xxxxxxxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/watchdog/imx2_wdt.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 518dfa1047cb..5098982e1a58 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -181,8 +181,10 @@ static void __imx2_wdt_set_timeout(struct watchdog_device *wdog,
static int imx2_wdt_set_timeout(struct watchdog_device *wdog,
unsigned int new_timeout)
{
- __imx2_wdt_set_timeout(wdog, new_timeout);
+ unsigned int actual;

+ actual = min(new_timeout, wdog->max_hw_heartbeat_ms * 1000);
+ __imx2_wdt_set_timeout(wdog, actual);
wdog->timeout = new_timeout;
return 0;
}
--
2.20.1