From dcf14779280215d1765141ce04c675df3e4301c5 Mon Sep 17 00:00:00 2001
From: Harvey Yang <harvey.huawei.yang@gmail.com>
Date: Tue, 22 Jan 2013 13:31:30 +0800
Subject: [PATCH] staging: usbip: use interrupt safe spinlock to avoid
 potential deadlock.

The function 'usbip_event_add()' may be called in interrupt context on
the stub side:
'stub_complete'->'stub_enqueue_ret_unlink'->'usbip_event_add'.
In this function it tries to get the lock 'ud->lock', so we should
disable irq when we get this lock in process context.

Signed-off-by: Harvey Yang <harvey.huawei.yang@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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