dev_file_info = comedi_get_device_file_info(minor);
        if (dev_file_info == NULL)
-               return -ENODEV;
+               return -ENODEV;
        dev = dev_file_info->device;
        if (dev == NULL)
-               return -ENODEV;
+               return -ENODEV;
 
        mutex_lock(&dev->mutex);
        if (!dev->attached) {
        dev_file_info = comedi_get_device_file_info(minor);
 
        if (dev_file_info == NULL)
-               return -ENODEV;
+               return -ENODEV;
        dev = dev_file_info->device;
        if (dev == NULL)
-               return -ENODEV;
+               return -ENODEV;
 
        mutex_lock(&dev->mutex);
        if (!dev->attached) {
        dev_file_info = comedi_get_device_file_info(minor);
 
        if (dev_file_info == NULL)
-               return -ENODEV;
+               return -ENODEV;
        dev = dev_file_info->device;
        if (dev == NULL)
-               return -ENODEV;
+               return -ENODEV;
 
        if (!dev->attached) {
                DPRINTK("no driver configured on comedi%i\n", dev->minor);
        dev_file_info = comedi_get_device_file_info(minor);
 
        if (dev_file_info == NULL)
-               return -ENODEV;
+               return -ENODEV;
        dev = dev_file_info->device;
        if (dev == NULL)
-               return -ENODEV;
+               return -ENODEV;
 
        if (!dev->attached) {
                DPRINTK("no driver configured on comedi%i\n", dev->minor);
        dev_file_info = comedi_get_device_file_info(minor);
 
        if (dev_file_info == NULL)
-               return -ENODEV;
+               return -ENODEV;
        dev = dev_file_info->device;
        if (dev == NULL)
-               return -ENODEV;
+               return -ENODEV;
 
        mutex_lock(&dev->mutex);
 
        dev_file_info = comedi_get_device_file_info(minor);
 
        if (dev_file_info == NULL)
-               return -ENODEV;
+               return -ENODEV;
        dev = dev_file_info->device;
        if (dev == NULL)
-               return -ENODEV;
+               return -ENODEV;
 
        return fasync_helper(fd, file, on, &dev->async_queue);
 }