From 53f96cee1aff74c8ee3c5f7a25df0c01d7117eeb Mon Sep 17 00:00:00 2001 From: Vladimir Zapolskiy Date: Fri, 7 Oct 2016 15:37:00 +0300 Subject: 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 Reviewed-by: Guenter Roeck Reviewed-by: Wolfram Sang Tested-by: Wolfram Sang Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/watchdog_dev.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'drivers/watchdog/watchdog_dev.c') 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) -- cgit v1.2.3