mei: use internal watchdog device registration tracking

remove bool wd_interface_reg as watchdog device already
keeps track of its registration
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/init.c

@@ -111,8 +111,6 @@ struct mei_device *mei_device_init(struct pci_dev *pdev)
 	init_waitqueue_head(&dev->wait_stop_wd);
 	dev->dev_state = MEI_DEV_INITIALIZING;
 	dev->iamthif_state = MEI_IAMTHIF_IDLE;
-	dev->wd_interface_reg = false;
-
 
 	mei_io_list_init(&dev->read_list);
 	mei_io_list_init(&dev->write_list);

drivers/misc/mei/mei_dev.h

@@ -249,7 +249,6 @@ struct mei_device {
 
 	struct mei_cl wd_cl;
 	enum mei_wd_states wd_state;
-	bool wd_interface_reg;
 	bool wd_pending;
 	u16 wd_timeout;
 	unsigned char wd_data[MEI_WD_START_MSG_SIZE];

drivers/misc/mei/wd.c

@@ -360,23 +360,20 @@ void mei_watchdog_register(struct mei_device *dev)
 	if (watchdog_register_device(&amt_wd_dev)) {
 		dev_err(&dev->pdev->dev,
 			"wd: unable to register watchdog device.\n");
-		dev->wd_interface_reg = false;
 		return;
 	}
 
 	dev_dbg(&dev->pdev->dev,
 		"wd: successfully register watchdog interface.\n");
-	dev->wd_interface_reg = true;
 	watchdog_set_drvdata(&amt_wd_dev, dev);
 }
 
 void mei_watchdog_unregister(struct mei_device *dev)
 {
-	if (!dev->wd_interface_reg)
+	if (test_bit(WDOG_UNREGISTERED, &amt_wd_dev.status))
 		return;
 
 	watchdog_set_drvdata(&amt_wd_dev, NULL);
 	watchdog_unregister_device(&amt_wd_dev);
-	dev->wd_interface_reg = false;
 }