From a2a97a039aec50399f02311d742fc3bf8ab7d449 Mon Sep 17 00:00:00 2001
From: Grazvydas Ignotas <notasas@gmail.com>
Date: Sat, 4 Jul 2015 23:55:59 +0300
Subject: [PATCH] usb: musb: do multiple irq processing passes

seems to reduce irq scheduling overhead (~5% or so) and improve
responsiveness.
Not 100% sure if this is safe (doing this in musb_gadget_queue()
seems to lock up everything).
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