[PATCH v2 04/22] watchdog: ziirave_wdt: Don't bail out on unexpected timeout value

[Andrey Smirnov]

Reprogramming bootloader on watchdog MCU will result in reported
default timeout value of "0". That in turn will be unnecessarily
rejected by the driver as invalid device (-ENODEV). Simplify probe to
read stored timeout value, set it to a sane default if it is bogus,
and then program that value unconditionally.

Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Cc: Chris Healy <cphealy@xxxxxxxxx>
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: Rick Ramstetter <rick@xxxxxxxxxxxxxxx>
Cc: linux-watchdog@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 drivers/watchdog/ziirave_wdt.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c
index b3e255b40209..a11b92383c5f 100644
--- a/drivers/watchdog/ziirave_wdt.c
+++ b/drivers/watchdog/ziirave_wdt.c
@@ -23,6 +23,7 @@
 
 #define ZIIRAVE_TIMEOUT_MIN	3
 #define ZIIRAVE_TIMEOUT_MAX	255
+#define ZIIRAVE_TIMEOUT_DEFAULT	30
 
 #define ZIIRAVE_PING_VALUE	0x0
 
@@ -673,22 +674,21 @@ static int ziirave_wdt_probe(struct i2c_client *client,
 			return val;
 		}
 
-		if (val < ZIIRAVE_TIMEOUT_MIN)
-			return -ENODEV;
+		if (val > ZIIRAVE_TIMEOUT_MAX ||
+		    val < ZIIRAVE_TIMEOUT_MIN)
+			val = ZIIRAVE_TIMEOUT_DEFAULT;
 
 		w_priv->wdd.timeout = val;
-	} else {
-		ret = ziirave_wdt_set_timeout(&w_priv->wdd,
-					      w_priv->wdd.timeout);
-		if (ret) {
-			dev_err(&client->dev, "Failed to set timeout\n");
-			return ret;
-		}
+	}
 
-		dev_info(&client->dev, "Timeout set to %ds\n",
-			 w_priv->wdd.timeout);
+	ret = ziirave_wdt_set_timeout(&w_priv->wdd, w_priv->wdd.timeout);
+	if (ret) {
+		dev_err(&client->dev, "Failed to set timeout\n");
+		return ret;
 	}
 
+	dev_info(&client->dev, "Timeout set to %ds\n", w_priv->wdd.timeout);
+
 	watchdog_set_nowayout(&w_priv->wdd, nowayout);
 
 	i2c_set_clientdata(client, w_priv);
-- 
2.21.0