From 7139c932859f5b35b5a928b445e03f5a43610fa7 Mon Sep 17 00:00:00 2001
From: Peter Hung <hpeter@gmail.com>
Date: Tue, 17 Mar 2015 17:48:21 +0800
Subject: [PATCH] USB: f81232: change lock mechanism

The original driver lock with spin_lock_irqsave()/spin_unlock_irqrestore()
because of it's maybe used in interrupt context f81232_process_read_urb().

We had remove it from previous patch "implement RX bulk-in EP", so we can
change it from busying loop spin_lock to sleepable mutex_lock.

Signed-off-by: Peter Hung <hpeter+linux_kernel@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
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