#include <linux/module.h>
#include <linux/kref.h>
#include <linux/mutex.h>
-#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/workqueue.h>
int subminor;
struct usb_interface *interface;
- lock_kernel();
subminor = iminor(inode);
interface = usb_find_interface(&ftdi_elan_driver, subminor);
if (!interface) {
- unlock_kernel();
printk(KERN_ERR "can't find device for minor %d\n", subminor);
return -ENODEV;
} else {
struct usb_ftdi *ftdi = usb_get_intfdata(interface);
if (!ftdi) {
- unlock_kernel();
return -ENODEV;
} else {
if (down_interruptible(&ftdi->sw_lock)) {
- unlock_kernel();
return -EINTR;
} else {
ftdi_elan_get_kref(ftdi);
file->private_data = ftdi;
- unlock_kernel();
return 0;
}
}