From 621367ef474da0e2ec390abbb2251ba192e2312c Mon Sep 17 00:00:00 2001
From: Grazvydas Ignotas <notasas@gmail.com>
Date: Sat, 4 Jul 2015 23:51:00 +0300
Subject: [PATCH] usb: musb: clear MUSB_INTR_SOF

MUSB_INTR_SOF is always masked, but still shows up in status register
and causes musb_stage0_irq() to be called needlessly, then work to be
scheduled at the end of musb_stage0_irq(), and that doubles context
switch count.
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