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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 11:27:20 +0300 |
| commit | 53f96cee1aff74c8ee3c5f7a25df0c01d7117eeb (patch) | |
| tree | 37a838b634be099db8b442e13d13686c1a3f1b4e /drivers/watchdog/watchdog_dev.c | |
| parent | da0d12ff2b829a35e9921918e925d79497b82bef (diff) | |
| download | linux-53f96cee1aff74c8ee3c5f7a25df0c01d7117eeb.tar.xz | |
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_dev.c')
| -rw-r--r-- | drivers/watchdog/watchdog_dev.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c index d2d0b5e37a35..3fdbe0ab1365 100644 --- a/drivers/watchdog/watchdog_dev.c +++ b/drivers/watchdog/watchdog_dev.c @@ -497,7 +497,20 @@ static ssize_t pretimeout_governor_show(struct device *dev, return watchdog_pretimeout_governor_get(wdd, buf); } -static DEVICE_ATTR_RO(pretimeout_governor); + +static ssize_t pretimeout_governor_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct watchdog_device *wdd = dev_get_drvdata(dev); + int ret = watchdog_pretimeout_governor_set(wdd, buf); + + if (!ret) + ret = count; + + return ret; +} +static DEVICE_ATTR_RW(pretimeout_governor); static umode_t wdt_is_visible(struct kobject *kobj, struct attribute *attr, int n) |