#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
+#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <asm/io.h>
unsigned m = iminor(inode);
file->private_data = &scx200_gpio_ops;
+ cycle_kernel_lock();
if (m >= MAX_PINS)
return -EINVAL;
return nonseekable_open(inode, file);