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/ifpps/Makefile

ifpps-libs =	$(shell pkg-config --libs ncurses)

ifpps-objs =	xmalloc.o \
		ioops.o \
		promisc.o \
		str.o \
		link.o \
		sock.o \
		dev.o \
		sig.o \
		screen.o \
		ifpps.o

ifpps-eflags = $(shell pkg-config --cflags ncurses)