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/irq.h

#ifndef IRQ_H
#define IRQ_H

extern int device_irq_number(const char *ifname);
extern void device_restore_irq_affinity_list(void);
extern int device_set_irq_affinity_list(int irq, unsigned long from,
					unsigned long to);
extern int device_set_irq_affinity(int irq, unsigned long cpu);

#endif /* IRQ_H */