[2/2] watchdog: add wdt shutdown callback to disable wdt if enabled
diff mbox

Message ID 1437535610-51314-3-git-send-email-eddie.huang@mediatek.com
State New
Headers show

Commit Message

Eddie Huang July 22, 2015, 3:26 a.m. UTC
From: Greta Zhang <greta.zhang@mediatek.com>

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 <greta.zhang@mediatek.com>
Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
---
 drivers/watchdog/mtk_wdt.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Comments

Guenter Roeck July 22, 2015, 3:48 a.m. UTC | #1
On 07/21/2015 08:26 PM, Eddie Huang wrote:
> From: Greta Zhang <greta.zhang@mediatek.com>
>
> 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 <greta.zhang@mediatek.com>
> Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
> ---
>   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 5ef3910..c6741a5 100644
> --- a/drivers/watchdog/mtk_wdt.c
> +++ b/drivers/watchdog/mtk_wdt.c
> @@ -217,6 +217,14 @@ 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 (mtk_wdt->started)

watchdog_active() ?

> +		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);
> @@ -266,6 +274,7 @@ MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids);
>   static struct platform_driver mtk_wdt_driver = {
>   	.probe		= mtk_wdt_probe,
>   	.remove		= mtk_wdt_remove,
> +	.shutdown	= mtk_wdt_shutdown,
>   	.suspend	= mtk_wdt_suspend,
>   	.resume		= mtk_wdt_resume,
>   	.driver		= {
>

Patch
diff mbox

diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
index 5ef3910..c6741a5 100644
--- a/drivers/watchdog/mtk_wdt.c
+++ b/drivers/watchdog/mtk_wdt.c
@@ -217,6 +217,14 @@  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 (mtk_wdt->started)
+		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);
@@ -266,6 +274,7 @@  MODULE_DEVICE_TABLE(of, mtk_wdt_dt_ids);
 static struct platform_driver mtk_wdt_driver = {
 	.probe		= mtk_wdt_probe,
 	.remove		= mtk_wdt_remove,
+	.shutdown	= mtk_wdt_shutdown,
 	.suspend	= mtk_wdt_suspend,
 	.resume		= mtk_wdt_resume,
 	.driver		= {