linux-kernel - [PATCH] watchdog: sbsa_gwdt: add shutdown hook to driver

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Date:   Mon, 24 Aug 2020 16:18:04 +0800
From:   Qiang Zhao <qiang.zhao@....com>
To:     wim@...ux-watchdog.org, linux@...ck-us.net
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zhao Qiang <qiang.zhao@....com>
Subject: [PATCH] watchdog: sbsa_gwdt: add shutdown hook to driver

From: Zhao Qiang <qiang.zhao@....com>

Kexec maybe need more time than timeout of wdt(sbsa)
which will reset the system.
So it is necessary to add shutdown hook to disable the
wdt when run kexec.

Signed-off-by: Zhao Qiang <qiang.zhao@....com>
---
 drivers/watchdog/sbsa_gwdt.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/watchdog/sbsa_gwdt.c b/drivers/watchdog/sbsa_gwdt.c
index f0f1e3b..bbcd04d 100644
--- a/drivers/watchdog/sbsa_gwdt.c
+++ b/drivers/watchdog/sbsa_gwdt.c
@@ -313,6 +313,14 @@ static int sbsa_gwdt_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static void sbsa_gwdt_shutdown(struct platform_device *pdev)
+{
+	struct sbsa_gwdt *gwdt;
+
+	gwdt = platform_get_drvdata(pdev);
+	sbsa_gwdt_stop(&gwdt->wdd);
+}
+
 /* Disable watchdog if it is active during suspend */
 static int __maybe_unused sbsa_gwdt_suspend(struct device *dev)
 {
@@ -357,6 +365,7 @@ static struct platform_driver sbsa_gwdt_driver = {
 		.pm = &sbsa_gwdt_pm_ops,
 		.of_match_table = sbsa_gwdt_of_match,
 	},
+	.shutdown = sbsa_gwdt_shutdown,
 	.probe = sbsa_gwdt_probe,
 	.id_table = sbsa_gwdt_pdev_match,
 };
-- 
2.7.4