mei: implement fasync for event notification

A process can be informed about client notification also via
SIGIO with POLL_PRI event.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index 70c94a9..7f53597 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -514,10 +514,8 @@
 	struct mei_cl *cl;
 
 	cl = mei_hbm_cl_find_by_cmd(dev, cmd);
-	if (cl && cl->notify_en) {
-		cl->notify_ev = true;
-		wake_up_interruptible(&cl->ev_wait);
-	}
+	if (cl)
+		mei_cl_notify(cl);
 }
 
 /**