MEDIA_NUM_DEVICES
minor = find_first_zero_bit(media_devnode_nums, MEDIA_NUM_DEVICES);
if (minor == MEDIA_NUM_DEVICES) {
ret = alloc_chrdev_region(&media_dev_t, 0, MEDIA_NUM_DEVICES,
unregister_chrdev_region(media_dev_t, MEDIA_NUM_DEVICES);
unregister_chrdev_region(media_dev_t, MEDIA_NUM_DEVICES);
static DECLARE_BITMAP(media_devnode_nums, MEDIA_NUM_DEVICES);