HID: cp2112: fix sleep-while-atomic

A recent commit fixing DMA-buffers on stack added a shared transfer
buffer protected by a spinlock. This is broken as the USB HID request
callbacks can sleep. Fix this up by replacing the spinlock with a mutex.

Fixes: 1ffb3c40ffb5 ("HID: cp2112: make transfer buffers DMA capable")
Cc: stable <stable@vger.kernel.org>	# 4.9
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

path: root/include/net/netns/packet.h

/*
 * Packet network namespace
 */
#ifndef __NETNS_PACKET_H__
#define __NETNS_PACKET_H__

#include <linux/rculist.h>
#include <linux/mutex.h>

struct netns_packet {
	struct mutex		sklist_lock;
	struct hlist_head	sklist;
};

#endif /* __NETNS_PACKET_H__ */