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/tstamping.h

#ifndef TSTAMPING_H
#define TSTAMPING_H

#include "config.h"

#ifdef HAVE_HARDWARE_TIMESTAMPING
extern int set_sockopt_hwtimestamp(int sock, const char *dev);
#else
static inline int set_sockopt_hwtimestamp(int sock, const char *dev)
{
	return -1;
}
#endif

#endif /* TSTAMPING_H */