linux-kernel - [PATCH -next] watchdog: sbsa: Test WDOG_HW

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Date:   Wed, 1 Mar 2023 11:37:02 +0000
From:   Wang Wensheng <wangwensheng4@...wei.com>
To:     <wim@...ux-watchdog.org>, <linux@...ck-us.net>,
        <linux-watchdog@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <xuqiang36@...wei.com>
Subject: [PATCH -next] watchdog: sbsa: Test WDOG_HW_RUNNING bit in suspend and resume

If the sbsa_gwdt is enabled by BIOS, the kernel set WDOG_HW_RUNNING bit
and keep it alive before anyone else would open it. When system suspend,
the sbsa_gwdt would not be disabled because WDOG_ACTIVE is not set. Then
the sbsa_gwdt would reach timeout since no one touch it during system
suspend.

To solve this, just test WDOG_HW_RUNNING bit in suspend and disable the
sbsa_gwdt if the bit is set, then reopen it accordingly in resume
process.

Signed-off-by: Wang Wensheng <wangwensheng4@...wei.com>
---
 drivers/watchdog/sbsa_gwdt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/sbsa_gwdt.c b/drivers/watchdog/sbsa_gwdt.c
index 9791c74aebd4..60875a710e43 100644
--- a/drivers/watchdog/sbsa_gwdt.c
+++ b/drivers/watchdog/sbsa_gwdt.c
@@ -360,7 +360,7 @@ static int __maybe_unused sbsa_gwdt_suspend(struct device *dev)
 {
 	struct sbsa_gwdt *gwdt = dev_get_drvdata(dev);
 
-	if (watchdog_active(&gwdt->wdd))
+	if (watchdog_hw_running(&gwdt->wdd))
 		sbsa_gwdt_stop(&gwdt->wdd);
 
 	return 0;
@@ -371,7 +371,7 @@ static int __maybe_unused sbsa_gwdt_resume(struct device *dev)
 {
 	struct sbsa_gwdt *gwdt = dev_get_drvdata(dev);
 
-	if (watchdog_active(&gwdt->wdd))
+	if (watchdog_hw_running(&gwdt->wdd))
 		sbsa_gwdt_start(&gwdt->wdd);
 
 	return 0;
-- 
2.17.1