Rescan a serio port in serio.c only when a character comes from it

only in case it's a valid character (correct parity, no timeout).

drivers/input/serio/serio.c

@@ -139,8 +139,9 @@ void serio_interrupt(struct serio *serio, unsigned char data, unsigned int flags
 {       
         if (serio->dev && serio->dev->interrupt) 
                 serio->dev->interrupt(serio, data, flags);
-	else
-		serio_rescan(serio);
+	else 
+		if (!flags)
+			serio_rescan(serio);
 }
 
 void serio_register_port(struct serio *serio)