62 static int watchdog_ping(struct watchdog_device *wddev)  in watchdog_ping()  argument
66 	mutex_lock(&wddev->lock);  in watchdog_ping()
68 	if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {  in watchdog_ping()
73 	if (!watchdog_active(wddev))  in watchdog_ping()
76 	if (wddev->ops->ping)  in watchdog_ping()
77 		err = wddev->ops->ping(wddev);  /* ping the watchdog */  in watchdog_ping()
79 		err = wddev->ops->start(wddev); /* restart watchdog */  in watchdog_ping()
82 	mutex_unlock(&wddev->lock);  in watchdog_ping()
95 static int watchdog_start(struct watchdog_device *wddev)  in watchdog_start()  argument
99 	mutex_lock(&wddev->lock);  in watchdog_start()
101 	if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {  in watchdog_start()
106 	if (watchdog_active(wddev))  in watchdog_start()
109 	err = wddev->ops->start(wddev);  in watchdog_start()
111 		set_bit(WDOG_ACTIVE, &wddev->status);  in watchdog_start()
114 	mutex_unlock(&wddev->lock);  in watchdog_start()
128 static int watchdog_stop(struct watchdog_device *wddev)  in watchdog_stop()  argument
132 	mutex_lock(&wddev->lock);  in watchdog_stop()
134 	if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {  in watchdog_stop()
139 	if (!watchdog_active(wddev))  in watchdog_stop()
142 	if (test_bit(WDOG_NO_WAY_OUT, &wddev->status)) {  in watchdog_stop()
143 		dev_info(wddev->dev, "nowayout prevents watchdog being stopped!\n");  in watchdog_stop()
148 	err = wddev->ops->stop(wddev);  in watchdog_stop()
150 		clear_bit(WDOG_ACTIVE, &wddev->status);  in watchdog_stop()
153 	mutex_unlock(&wddev->lock);  in watchdog_stop()
165 static int watchdog_get_status(struct watchdog_device *wddev,  in watchdog_get_status()  argument
171 	if (!wddev->ops->status)  in watchdog_get_status()
174 	mutex_lock(&wddev->lock);  in watchdog_get_status()
176 	if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {  in watchdog_get_status()
181 	*status = wddev->ops->status(wddev);  in watchdog_get_status()
184 	mutex_unlock(&wddev->lock);  in watchdog_get_status()
194 static int watchdog_set_timeout(struct watchdog_device *wddev,  in watchdog_set_timeout()  argument
199 	if ((wddev->ops->set_timeout == NULL) ||  in watchdog_set_timeout()
200 	    !(wddev->info->options & WDIOF_SETTIMEOUT))  in watchdog_set_timeout()
203 	if (watchdog_timeout_invalid(wddev, timeout))  in watchdog_set_timeout()
206 	mutex_lock(&wddev->lock);  in watchdog_set_timeout()
208 	if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {  in watchdog_set_timeout()
213 	err = wddev->ops->set_timeout(wddev, timeout);  in watchdog_set_timeout()
216 	mutex_unlock(&wddev->lock);  in watchdog_set_timeout()
228 static int watchdog_get_timeleft(struct watchdog_device *wddev,  in watchdog_get_timeleft()  argument
234 	if (!wddev->ops->get_timeleft)  in watchdog_get_timeleft()
237 	mutex_lock(&wddev->lock);  in watchdog_get_timeleft()
239 	if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {  in watchdog_get_timeleft()
244 	*timeleft = wddev->ops->get_timeleft(wddev);  in watchdog_get_timeleft()
247 	mutex_unlock(&wddev->lock);  in watchdog_get_timeleft()
258 static int watchdog_ioctl_op(struct watchdog_device *wddev, unsigned int cmd,  in watchdog_ioctl_op()  argument
263 	if (!wddev->ops->ioctl)  in watchdog_ioctl_op()
266 	mutex_lock(&wddev->lock);  in watchdog_ioctl_op()
268 	if (test_bit(WDOG_UNREGISTERED, &wddev->status)) {  in watchdog_ioctl_op()
273 	err = wddev->ops->ioctl(wddev, cmd, arg);  in watchdog_ioctl_op()
276 	mutex_unlock(&wddev->lock);  in watchdog_ioctl_op()