[v2,04/22] watchdog: ziirave_wdt: Don't bail out on unexpected timeout value
diff mbox series

Message ID 20190812200906.31344-5-andrew.smirnov@gmail.com
State Accepted
Headers show
Series
  • Ziirave_wdt driver fixes
Related show

Commit Message

Andrey Smirnov Aug. 12, 2019, 8:08 p.m. UTC
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@gmail.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Rick Ramstetter <rick@anteaterllc.com>
Cc: linux-watchdog@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/watchdog/ziirave_wdt.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

Comments

Guenter Roeck Aug. 15, 2019, 6:12 p.m. UTC | #1
On Mon, Aug 12, 2019 at 01:08:48PM -0700, Andrey Smirnov wrote:
> 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@gmail.com>
> Cc: Chris Healy <cphealy@gmail.com>
> Cc: Guenter Roeck <linux@roeck-us.net>
> Cc: Rick Ramstetter <rick@anteaterllc.com>
> Cc: linux-watchdog@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

Patch
diff mbox series

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);