mei: check whether hw start has succeeded

hw start may fail therefore the reset flow has
to check for the return value

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/init.c

@@ -181,7 +181,12 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
 		return;
 	}
 
-	mei_hw_start(dev);
+	ret = mei_hw_start(dev);
+	if (ret) {
+		dev_err(&dev->pdev->dev, "hw_start failed disabling the device\n");
+		dev->dev_state = MEI_DEV_DISABLED;
+		return;
+	}
 
 	dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
 	/* link is established * start sending messages.  */

drivers/misc/mei/mei_dev.h

@@ -544,9 +544,9 @@ static inline int mei_hw_reset(struct mei_device *dev, bool enable)
 	return dev->ops->hw_reset(dev, enable);
 }
 
-static inline void mei_hw_start(struct mei_device *dev)
+static inline int mei_hw_start(struct mei_device *dev)
 {
-	dev->ops->hw_start(dev);
+	return dev->ops->hw_start(dev);
 }
 
 static inline void mei_clear_interrupts(struct mei_device *dev)