#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mutex.h>
-#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include <linux/input.h>
int retval;
struct usb_interface *interface;
- lock_kernel();
nonseekable_open(inode, file);
subminor = iminor(inode);
interface = usb_find_interface(&ld_usb_driver, subminor);
if (!interface) {
- unlock_kernel();
err("%s - error, can't find device for minor %d\n",
__func__, subminor);
return -ENODEV;
dev = usb_get_intfdata(interface);
- if (!dev) {
- unlock_kernel();
+ if (!dev)
return -ENODEV;
- }
/* lock this device */
- if (mutex_lock_interruptible(&dev->mutex)) {
- unlock_kernel();
+ if (mutex_lock_interruptible(&dev->mutex))
return -ERESTARTSYS;
- }
/* allow opening only once */
if (dev->open_count) {
unlock_exit:
mutex_unlock(&dev->mutex);
- unlock_kernel();
return retval;
}