linux-kernel - [PATCHv4 2/4] watchdog: reset last_hw

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Date:   Thu, 12 Mar 2020 11:58:06 +0200
From:   Tero Kristo <t-kristo@...com>
To:     <wim@...ux-watchdog.org>, <linux@...ck-us.net>,
        <linux-watchdog@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCHv4 2/4] watchdog: reset last_hw_keepalive time at start

Currently the watchdog core does not initialize the last_hw_keepalive
time during watchdog startup. This will cause the watchdog to be pinged
immediately if enough time has passed from the system boot-up time, and
some types of watchdogs like K3 RTI does not like this.

To avoid the issue, setup the last_hw_keepalive time during watchdog
startup.

Signed-off-by: Tero Kristo <t-kristo@...com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
---
v4:
  * applied Guenter's reviewed by tag
v2:
  * apply functionality always instead of being behind a flag

 drivers/watchdog/watchdog_dev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 8b5c742f24e8..7e4cd34a8c20 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -282,6 +282,7 @@ static int watchdog_start(struct watchdog_device *wdd)
 	if (err == 0) {
 		set_bit(WDOG_ACTIVE, &wdd->status);
 		wd_data->last_keepalive = started_at;
+		wd_data->last_hw_keepalive = started_at;
 		watchdog_update_worker(wdd);
 	}
 
-- 
2.17.1

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