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| author | Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> | 2016-10-07 15:37:00 +0300 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2016-10-08 10:27:20 +0200 |
| commit | 53f96cee1aff74c8ee3c5f7a25df0c01d7117eeb (patch) | |
| tree | 37a838b634be099db8b442e13d13686c1a3f1b4e /drivers/watchdog/watchdog_pretimeout.h | |
| parent | da0d12ff2b829a35e9921918e925d79497b82bef (diff) | |
watchdog: pretimeout: add option to select a pretimeout governor in runtime
The change converts watchdog device attribute "pretimeout_governor" from
read-only to read-write type to allow users to select a desirable
watchdog pretimeout governor in runtime, e.g.
% echo -n panic > /sys/..../watchdog/watchdog0/pretimeout
To get this working a list of registered pretimeout governors is created
and a new helper function watchdog_pretimeout_governor_set() is exported
to watchdog_dev.c.
If a selected governor is gone, a watchdog device pretimeout notification
is delegated to a default built-in pretimeout governor.
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog/watchdog_pretimeout.h')
| -rw-r--r-- | drivers/watchdog/watchdog_pretimeout.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/watchdog/watchdog_pretimeout.h b/drivers/watchdog/watchdog_pretimeout.h index 867492aa7ea6..6cd6c89a411c 100644 --- a/drivers/watchdog/watchdog_pretimeout.h +++ b/drivers/watchdog/watchdog_pretimeout.h @@ -19,6 +19,8 @@ void watchdog_unregister_governor(struct watchdog_governor *gov); int watchdog_register_pretimeout(struct watchdog_device *wdd); void watchdog_unregister_pretimeout(struct watchdog_device *wdd); int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf); +int watchdog_pretimeout_governor_set(struct watchdog_device *wdd, + const char *buf); #if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP) #define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "noop" @@ -41,6 +43,12 @@ static inline int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, { return -EINVAL; } + +static inline int watchdog_pretimeout_governor_set(struct watchdog_device *wdd, + const char *buf) +{ + return -EINVAL; +} #endif #endif |