linux-kernel - [PATCH 4.4 040/135] watchdog: da9062: No need to ping manually before setting timeout

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Message-Id: <20200629155309.2495516-41-sashal@kernel.org>
Date:   Mon, 29 Jun 2020 11:51:34 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Stefan Riedmueller <s.riedmueller@...tec.de>,
        Guenter Roeck <linux@...ck-us.net>,
        Adam Thomson <Adam.Thomson.Opensource@...semi.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 040/135] watchdog: da9062: No need to ping manually before setting timeout

From: Stefan Riedmueller <s.riedmueller@...tec.de>

[ Upstream commit a0948ddba65f4f6d3cfb5e2b84685485d0452966 ]

There is actually no need to ping the watchdog before disabling it
during timeout change. Disabling the watchdog already takes care of
resetting the counter.

This fixes an issue during boot when the userspace watchdog handler takes
over and the watchdog is already running. Opening the watchdog in this case
leads to the first ping and directly after that without the required
heartbeat delay a second ping issued by the set_timeout call. Due to the
missing delay this resulted in a reset.

Signed-off-by: Stefan Riedmueller <s.riedmueller@...tec.de>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Reviewed-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Link: https://lore.kernel.org/r/20200403130728.39260-3-s.riedmueller@phytec.de
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@...ux-watchdog.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/watchdog/da9062_wdt.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c
index daeb645fcea8a..519419136ce8f 100644
--- a/drivers/watchdog/da9062_wdt.c
+++ b/drivers/watchdog/da9062_wdt.c
@@ -94,11 +94,6 @@ static int da9062_wdt_update_timeout_register(struct da9062_watchdog *wdt,
 					      unsigned int regval)
 {
 	struct da9062 *chip = wdt->hw;
-	int ret;
-
-	ret = da9062_reset_watchdog_timer(wdt);
-	if (ret)
-		return ret;
 
 	return regmap_update_bits(chip->regmap,
 				  DA9062AA_CONTROL_D,
-- 
2.25.1