#define IOCTL_GET_DRV_VERSION 2
-static DEFINE_MUTEX(lcd_mutex);
static const struct usb_device_id id_table[] = {
{ .idVendor = 0x10D2, .match_flags = USB_DEVICE_ID_MATCH_VENDOR, },
{ },
struct usb_interface *interface;
int subminor, r;
- mutex_lock(&lcd_mutex);
subminor = iminor(inode);
interface = usb_find_interface(&lcd_driver, subminor);
if (!interface) {
- mutex_unlock(&lcd_mutex);
printk(KERN_ERR "USBLCD: %s - error, can't find device for minor %d\n",
__func__, subminor);
return -ENODEV;
r = usb_autopm_get_interface(interface);
if (r < 0) {
kref_put(&dev->kref, lcd_delete);
- mutex_unlock(&lcd_mutex);
return r;
}
/* save our object in the file's private structure */
file->private_data = dev;
- mutex_unlock(&lcd_mutex);
return 0;
}
switch (cmd) {
case IOCTL_GET_HARD_VERSION:
- mutex_lock(&lcd_mutex);
bcdDevice = le16_to_cpu((dev->udev)->descriptor.bcdDevice);
sprintf(buf, "%1d%1d.%1d%1d",
(bcdDevice & 0xF000)>>12,
(bcdDevice & 0xF00)>>8,
(bcdDevice & 0xF0)>>4,
(bcdDevice & 0xF));
- mutex_unlock(&lcd_mutex);
if (copy_to_user((void __user *)arg, buf, strlen(buf)) != 0)
return -EFAULT;
break;