This allows the system to actually halt even if userspace forgot to
disable the watchdog first. Old behaviour was that the watchdog forced
the system to boot again.
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Harald Geyer <harald@xxxxxxxxx>
---
Changes since v3:
* Fix two minor whitespace issues
* Send this patch (was 1/2) alone, because Uwe wants more time looking into
2/2.
Changes since v2:
* split this out as a separate patch
drivers/watchdog/stmp3xxx_rtc_wdt.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/watchdog/stmp3xxx_rtc_wdt.c b/drivers/watchdog/stmp3xxx_rtc_wdt.c
index 3ee6128..dbe0372 100644
--- a/drivers/watchdog/stmp3xxx_rtc_wdt.c
+++ b/drivers/watchdog/stmp3xxx_rtc_wdt.c
@@ -14,6 +14,8 @@
#include <linux/watchdog.h>
#include <linux/platform_device.h>
#include <linux/stmp3xxx_rtc_wdt.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
#define WDOG_TICK_RATE 1000 /* 1 kHz clock */
#define STMP3XXX_DEFAULT_TIMEOUT 19
@@ -69,6 +71,28 @@ static struct watchdog_device stmp3xxx_wdd = {
.status = WATCHDOG_NOWAYOUT_INIT_STATUS,
};
+static int wdt_notify_sys(struct notifier_block *nb, unsigned long code,
+ void *unused)
+{
+ struct device *dev = watchdog_get_drvdata(&stmp3xxx_wdd);
+ struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev);
+
+ switch (code) {
+ case SYS_DOWN: /* keep enabled, system might crash while going down */
+ break;
+ case SYS_HALT: /* allow the system to actually halt */
+ case SYS_POWER_OFF:
+ wdt_stop(&stmp3xxx_wdd);
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block wdt_notifier = {
+ .notifier_call = wdt_notify_sys,
+};
+
static int stmp3xxx_wdt_probe(struct platform_device *pdev)
{
int ret;
@@ -84,6 +108,9 @@ static int stmp3xxx_wdt_probe(struct platform_device *pdev)
return ret;
}
+ if (register_reboot_notifier(&wdt_notifier))
+ dev_warn(&pdev->dev, "cannot register reboot notifier\n");
+
dev_info(&pdev->dev, "initialized watchdog with heartbeat %ds\n",
stmp3xxx_wdd.timeout);
return 0;
@@ -91,6 +118,7 @@ static int stmp3xxx_wdt_probe(struct platform_device *pdev)
static int stmp3xxx_wdt_remove(struct platform_device *pdev)
{
+ unregister_reboot_notifier(&wdt_notifier);
watchdog_unregister_device(&stmp3xxx_wdd);
return 0;
}
--
2.1.4
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