[PATCH v9 2/8] watchdog: core: fix watchdog_check_min_max_timeout() return value

[Fabio Porcedda <fabio.porcedda-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

The device tree support is not mandatory, so the function doesn't
return error when is not used.
Return -EINVAL when the module parameter or
timeout-sec property is out of bounds.

Signed-off-by: Fabio Porcedda <fabio.porcedda-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Wim Van Sebroeck <wim-IQzOog9fTRqzQB+pC5nmwQ@public.gmane.org>
Cc: linux-watchdog-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
---
 drivers/watchdog/watchdog_core.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
index 94590f6..05d18b4 100644
--- a/drivers/watchdog/watchdog_core.c
+++ b/drivers/watchdog/watchdog_core.c
@@ -73,22 +73,28 @@ int watchdog_init_timeout(struct watchdog_device *wdd,
 				unsigned int timeout_parm, struct device *dev)
 {
 	unsigned int t = 0;
+	int ret = 0;
 
 	watchdog_check_min_max_timeout(wdd);
 
 	/* try to get the tiemout module parameter first */
 	if (!watchdog_timeout_invalid(wdd, timeout_parm)) {
 		wdd->timeout = timeout_parm;
-		return 0;
+		return ret;
 	}
+	if (timeout_parm)
+		ret = -EINVAL;
 
 	/* try to get the timeout_sec property */
 	if (dev == NULL || dev->of_node == NULL)
-		return -EINVAL;
+		return ret;
 	of_property_read_u32(dev->of_node, "timeout-sec", &t);
 	if (!watchdog_timeout_invalid(wdd, t))
 		wdd->timeout = t;
-	return 0;
+	else
+		ret = -EINVAL;
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(watchdog_init_timeout);
 
-- 
1.8.1.1