xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

watchdog: pretimeout: add option to select a pretimeout governor in runtime

Browse Source 
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>
This commit is contained in:
Vladimir Zapolskiy
2016-10-07 15:37:00 +03:00
committed by Wim Van Sebroeck
parent da0d12ff2b
commit 53f96cee1a
3 changed files with 98 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/watchdog/watchdog_dev.c
View File

@@ -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)