[PATCH] Fix set_timeout for big timeout values

[Georg Hofmann <georg@hofmannsweb.com>]

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

Signed-off-by: Georg Hofmann <georg@hofmannsweb.com>
---
 drivers/watchdog/imx2_wdt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index 2b52514..3c13adc 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -178,9 +178,11 @@ 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;
 
-	wdog->timeout = new_timeout;
+	actual = min(new_timeout, wdog->max_hw_heartbeat_ms * 1000);
+	__imx2_wdt_set_timeout(wdog, actual);
+	wdog->timeout = actual;
 	return 0;
 }
 
-- 
2.7.4