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authorEduardo Valentin <eduval@amazon.com>2022-02-11 18:10:33 -0800
committerWim Van Sebroeck <wim@linux-watchdog.org>2022-03-27 17:04:08 +0200
commit4ed1a6b6e66dd9ba0a1d56ed23f46c39fe9368c5 (patch)
treed1418a684c06128a16585ca653899ceb722398ef /drivers/watchdog/aspeed_wdt.c
parentd055ef3a2c6919cff504ae3b710c96318d545fd2 (diff)
watchdog: aspeed: add nowayout support
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> Link: https://lore.kernel.org/r/20220212021033.2344-1-eduval@amazon.com Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog/aspeed_wdt.c')
-rw-r--r--drivers/watchdog/aspeed_wdt.c7
1 files changed, 7 insertions, 0 deletions
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);