From 277fe44dd862412ee034470ad1c13a79d24e533b Mon Sep 17 00:00:00 2001
From: Yonghua Zheng <younghua.zheng@gmail.com>
Date: Mon, 26 Aug 2013 23:38:35 +0800
Subject: [PATCH] HID: hidraw: Add spinlock in struct hidraw to protect list

It is unsafe to call list_for_each_entry in hidraw_report_event to
traverse each hidraw_list node without a lock protection, the list
could be modified if someone calls hidraw_release and list_del to
remove itself from the list, this can cause hidraw_report_event
to touch a deleted list struct and panic.

To prevent this, introduce a spinlock in struct hidraw to protect
list from concurrent access.

Signed-off-by: Yonghua Zheng <younghua.zheng@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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