mei: add also write waiting list to runtime pm blockers

The io callback is clear from write_waitling_list after
we receive interrupt from the hw to ack the write completion.
We need to wait for this interrupt deliver before we try
to enter low power state

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

drivers/misc/mei/init.c

@@ -361,13 +361,15 @@ bool mei_write_is_idle(struct mei_device *dev)
 {
 	bool idle = (dev->dev_state == MEI_DEV_ENABLED &&
 		list_empty(&dev->ctrl_wr_list.list) &&
-		list_empty(&dev->write_list.list));
+		list_empty(&dev->write_list.list)   &&
+		list_empty(&dev->write_waiting_list.list));
 
-	dev_dbg(dev->dev, "write pg: is idle[%d] state=%s ctrl=%d write=%d\n",
+	dev_dbg(dev->dev, "write pg: is idle[%d] state=%s ctrl=%01d write=%01d wwait=%01d\n",
 		idle,
 		mei_dev_state_str(dev->dev_state),
 		list_empty(&dev->ctrl_wr_list.list),
-		list_empty(&dev->write_list.list));
+		list_empty(&dev->write_list.list),
+		list_empty(&dev->write_waiting_list.list));
 
 	return idle;
 }