#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
-#include <linux/smp_lock.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
/* prevent a race condition with open() */
mutex_lock(&disconnect_mutex);
- dev = (struct usb_idmouse *) file->private_data;
+ dev = file->private_data;
if (dev == NULL) {
mutex_unlock(&disconnect_mutex);
static ssize_t idmouse_read(struct file *file, char __user *buffer, size_t count,
loff_t * ppos)
{
- struct usb_idmouse *dev;
+ struct usb_idmouse *dev = file->private_data;
int result;
- dev = (struct usb_idmouse *) file->private_data;
-
/* lock this object */
- down (&dev->sem);
+ down(&dev->sem);
/* verify that the device wasn't unplugged */
if (!dev->present) {
- up (&dev->sem);
+ up(&dev->sem);
return -ENODEV;
}