[PATCH v3 2/2] watchdog: mtk_wdt: add wdt shutdown callback to disable wdt if enabled
From: eddie.huang@mediatek.com (Eddie Huang)
Date: 2015-07-24 07:29:15
Also in:
linux-mediatek, linux-watchdog, lkml
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
From: Greta Zhang <redacted> Without .shutdown(), watchdog might reset the system during power off. For example, if watchdog's timeout is set to 30s, then it is reset to zero by mtk_wdt_ping(). During power off, no app will ping watchdog, but watchdog is still running and may trigger reset. Signed-off-by: Greta Zhang <redacted> Signed-off-by: Eddie Huang <eddie.huang@mediatek.com> Acked-by: Matthias Brugger <matthias.bgg@gmail.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> --- drivers/watchdog/mtk_wdt.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index 056412c..6ad9df9 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c@@ -210,6 +210,14 @@ static int mtk_wdt_probe(struct platform_device *pdev) return 0; } +static void mtk_wdt_shutdown(struct platform_device *pdev) +{ + struct mtk_wdt_dev *mtk_wdt = platform_get_drvdata(pdev); + + if (watchdog_active(&mtk_wdt->wdt_dev)) + mtk_wdt_stop(&mtk_wdt->wdt_dev); +} + static int mtk_wdt_remove(struct platform_device *pdev) { struct mtk_wdt_dev *mtk_wdt = platform_get_drvdata(pdev);
@@ -259,6 +267,7 @@ static const struct dev_pm_ops mtk_wdt_pm_ops = { static struct platform_driver mtk_wdt_driver = { .probe = mtk_wdt_probe, .remove = mtk_wdt_remove, + .shutdown = mtk_wdt_shutdown, .driver = { .name = DRV_NAME, .pm = &mtk_wdt_pm_ops,
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1.8.1.1.dirty