Ping watchdog pretimeout governor, on watchdog pretimeout event ping
watchdog device. Use this watchdog pretimeout governor with caution,
it may humiliate watchdog work, however it may be helpful in some
particular situations, for instance if once started watchdog can not
be stopped, but reboot caused by the watchdog is undesired.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>
---
drivers/watchdog/Kconfig | 16 +++++++++++++
drivers/watchdog/Makefile | 1 +
drivers/watchdog/pretimeout_ping.c | 48 ++++++++++++++++++++++++++++++++++++++
3 files changed, 65 insertions(+)
create mode 100644 drivers/watchdog/pretimeout_ping.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 6c1f7e1..cb0885a 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1669,6 +1669,12 @@ config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_DEVICE
Use device specific watchdog pretimeout event handler
by default.
+config WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PING
+ bool "ping"
+ select WATCHDOG_PRETIMEOUT_GOV_PING
+ help
+ Use ping watchdog pretimeout event handler by default.
+
endchoice
config WATCHDOG_PRETIMEOUT_GOV_NOOP
@@ -1698,6 +1704,16 @@ config WATCHDOG_PRETIMEOUT_GOV_DEVICE
does nothing, if watchdog driver does not define a pretimeout
callback.
+config WATCHDOG_PRETIMEOUT_GOV_PING
+ tristate "Ping watchdog pretimeout governor"
+ help
+ Ping watchdog pretimeout governor, on watchdog pretimeout
+ event ping watchdog device. Use this watchdog pretimeout
+ governor with caution, it may humiliate watchdog work,
+ however it may be helpful in some particular situations,
+ for instance if once started watchdog can not be stopped,
+ but reboot caused by the watchdog is undesired.
+
endif # WATCHDOG_PRETIMEOUT_GOV
endif # WATCHDOG
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index 0717b64..bbf6af8 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_NOOP) += pretimeout_noop.o
obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_PANIC) += pretimeout_panic.o
obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_USERSPACE) += pretimeout_userspace.o
obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_DEVICE) += pretimeout_device.o
+obj-$(CONFIG_WATCHDOG_PRETIMEOUT_GOV_PING) += pretimeout_ping.o
# Only one watchdog can succeed. We probe the ISA/PCI/USB based
# watchdog-cards first, then the architecture specific watchdog
diff --git a/drivers/watchdog/pretimeout_ping.c b/drivers/watchdog/pretimeout_ping.c
new file mode 100644
index 0000000..0d55205
--- /dev/null
+++ b/drivers/watchdog/pretimeout_ping.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2015 Mentor Graphics
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/watchdog.h>
+
+#include <watchdog_pretimeout.h>
+
+/**
+ * pretimeout_ping - Ping watchdog on pretimeout event
+ * @wdd - watchdog_device
+ *
+ */
+static void pretimeout_ping(struct watchdog_device *wdd)
+{
+ wdd->ops->ping(wdd);
+}
+
+static struct watchdog_governor watchdog_gov_ping = {
+ .name = "ping",
+ .pretimeout = pretimeout_ping,
+#ifdef CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PING
+ .is_default = true,
+#endif
+};
+
+static int __init watchdog_gov_ping_register(void)
+{
+ return watchdog_register_governor(&watchdog_gov_ping);
+}
+
+static void __exit watchdog_gov_ping_unregister(void)
+{
+ watchdog_unregister_governor(&watchdog_gov_ping);
+}
+module_init(watchdog_gov_ping_register);
+module_exit(watchdog_gov_ping_unregister);
+
+MODULE_AUTHOR("Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Ping watchdog pretimeout governor");
+MODULE_LICENSE("GPL");
--
2.1.4
--
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