diff mbox series

[1/1] watchdog: aspeed: add nowayout support

Message ID 20220212021033.2344-1-eduval@amazon.com (mailing list archive)
State New, archived
Headers show
Series [1/1] watchdog: aspeed: add nowayout support | expand

Commit Message

Eduardo Valentin Feb. 12, 2022, 2:10 a.m. UTC
Add support for not stopping the watchdog
when the userspace application quits. At
closing of the device, the driver cannot
determine if this was a graceful closure
or if the app crashed. If the support
of nowayout on this driver, the system integrator
can select the behaviour by setting the kernel
config and enabling it.

Cc: Wim Van Sebroeck <wim@linux-watchdog.org> (maintainer:WATCHDOG DEVICE DRIVERS)
Cc: Guenter Roeck <linux@roeck-us.net> (maintainer:WATCHDOG DEVICE DRIVERS)
Cc: Joel Stanley <joel@jms.id.au> (supporter:ARM/ASPEED MACHINE SUPPORT)
Cc: Andrew Jeffery <andrew@aj.id.au> (reviewer:ARM/ASPEED MACHINE SUPPORT)
Cc: linux-watchdog@vger.kernel.org (open list:WATCHDOG DEVICE DRIVERS)
Cc: linux-arm-kernel@lists.infradead.org (moderated list:ARM/ASPEED MACHINE SUPPORT)
Cc: linux-aspeed@lists.ozlabs.org (moderated list:ARM/ASPEED MACHINE SUPPORT)
Cc: linux-kernel@vger.kernel.org (open list)
Signed-off-by: Eduardo Valentin <eduval@amazon.com>
Signed-off-by: Eduardo Valentin <evalenti@kernel.org>
---
 drivers/watchdog/aspeed_wdt.c | 7 +++++++
 1 file changed, 7 insertions(+)

Comments

Guenter Roeck Feb. 12, 2022, 4:02 a.m. UTC | #1
On 2/11/22 18:10, Eduardo Valentin wrote:
> Add support for not stopping the watchdog
> when the userspace application quits. At
> closing of the device, the driver cannot
> determine if this was a graceful closure
> or if the app crashed. If the support
> of nowayout on this driver, the system integrator
> can select the behaviour by setting the kernel
> config and enabling it.
> 
> Cc: Wim Van Sebroeck <wim@linux-watchdog.org> (maintainer:WATCHDOG DEVICE DRIVERS)
> Cc: Guenter Roeck <linux@roeck-us.net> (maintainer:WATCHDOG DEVICE DRIVERS)
> Cc: Joel Stanley <joel@jms.id.au> (supporter:ARM/ASPEED MACHINE SUPPORT)
> Cc: Andrew Jeffery <andrew@aj.id.au> (reviewer:ARM/ASPEED MACHINE SUPPORT)
> Cc: linux-watchdog@vger.kernel.org (open list:WATCHDOG DEVICE DRIVERS)
> Cc: linux-arm-kernel@lists.infradead.org (moderated list:ARM/ASPEED MACHINE SUPPORT)
> Cc: linux-aspeed@lists.ozlabs.org (moderated list:ARM/ASPEED MACHINE SUPPORT)
> Cc: linux-kernel@vger.kernel.org (open list)
> Signed-off-by: Eduardo Valentin <eduval@amazon.com>
> Signed-off-by: Eduardo Valentin <evalenti@kernel.org>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>   drivers/watchdog/aspeed_wdt.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
> index 436571b6fc79..bd06622813eb 100644
> --- a/drivers/watchdog/aspeed_wdt.c
> +++ b/drivers/watchdog/aspeed_wdt.c
> @@ -13,6 +13,11 @@
>   #include <linux/platform_device.h>
>   #include <linux/watchdog.h>
>   
> +static bool nowayout = WATCHDOG_NOWAYOUT;
> +module_param(nowayout, bool, 0);
> +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
> +				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> +
>   struct aspeed_wdt {
>   	struct watchdog_device	wdd;
>   	void __iomem		*base;
> @@ -266,6 +271,8 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
>   	wdt->wdd.timeout = WDT_DEFAULT_TIMEOUT;
>   	watchdog_init_timeout(&wdt->wdd, 0, dev);
>   
> +	watchdog_set_nowayout(&wdt->wdd, nowayout);
> +
>   	np = dev->of_node;
>   
>   	ofdid = of_match_node(aspeed_wdt_of_table, np);
diff mbox series

Patch

diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
index 436571b6fc79..bd06622813eb 100644
--- a/drivers/watchdog/aspeed_wdt.c
+++ b/drivers/watchdog/aspeed_wdt.c
@@ -13,6 +13,11 @@ 
 #include <linux/platform_device.h>
 #include <linux/watchdog.h>
 
+static bool nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
 struct aspeed_wdt {
 	struct watchdog_device	wdd;
 	void __iomem		*base;
@@ -266,6 +271,8 @@  static int aspeed_wdt_probe(struct platform_device *pdev)
 	wdt->wdd.timeout = WDT_DEFAULT_TIMEOUT;
 	watchdog_init_timeout(&wdt->wdd, 0, dev);
 
+	watchdog_set_nowayout(&wdt->wdd, nowayout);
+
 	np = dev->of_node;
 
 	ofdid = of_match_node(aspeed_wdt_of_table, np);