提交 914d65f3 编写于 作者: G Guenter Roeck 提交者: Wim Van Sebroeck

watchdog: Fix kref imbalance seen if handle_boot_enabled=0

If handle_boot_enabled is set to 0, the watchdog driver module use
counter will not be increased and kref_get() will not be called when
registering the watchdog. Subsequently, on open, this does not happen
either because the code believes that it was already done because the
hardware watchdog is marked as running.

We could introduce a state variable to indicate this state, but let's
just increase the module use counter and call kref_get() unconditionally
if the hardware watchdog is running when a driver is registering itself
to keep the code simple.

Fixes: 2501b015 ("watchdog: core: add option to avoid early ...")
Cc: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>
上级 4bcd615f
......@@ -967,14 +967,13 @@ static int watchdog_cdev_register(struct watchdog_device *wdd, dev_t devno)
* and schedule an immediate ping.
*/
if (watchdog_hw_running(wdd)) {
if (handle_boot_enabled) {
__module_get(wdd->ops->owner);
kref_get(&wd_data->kref);
__module_get(wdd->ops->owner);
kref_get(&wd_data->kref);
if (handle_boot_enabled)
queue_delayed_work(watchdog_wq, &wd_data->work, 0);
} else {
else
pr_info("watchdog%d running and kernel based pre-userspace handler disabled\n",
wdd->id);
}
wdd->id);
}
return 0;
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册