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/tools/build/feature/test-cxx.cpp

#include <iostream>
#include <memory>

static void print_str(std::string s)
{
	std::cout << s << std::endl;
}

int main()
{
	std::string s("Hello World!");
	print_str(std::move(s));
	std::cout << "|" << s << "|" << std::endl;
	return 0;
}