pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler

According to VLI64 Intel Atom E3800 Specification Update (#329901)
concurrent read accesses may result in returning 0xffffffff and write
accesses may be dropped silently.
To workaround all accesses must be protected by locks.

Cc: stable@vger.kernel.org
Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

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 */