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authorVladimir Zapolskiy <vladimir_zapolskiy@mentor.com>2016-10-07 15:37:00 +0300
committerWim Van Sebroeck <wim@iguana.be>2016-10-08 11:27:20 +0300
commit53f96cee1aff74c8ee3c5f7a25df0c01d7117eeb (patch)
tree37a838b634be099db8b442e13d13686c1a3f1b4e /drivers/watchdog/watchdog_dev.c
parentda0d12ff2b829a35e9921918e925d79497b82bef (diff)
downloadlinux-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.c15
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)