RAW_BYTES_PER_DECODE_BLOCK
kmalloc(RAW_BYTES_PER_DECODE_BLOCK, GFP_KERNEL);
(available_data >= RAW_BYTES_PER_DECODE_BLOCK);
RAW_BYTES_PER_DECODE_BLOCK) {
RAW_BYTES_PER_DECODE_BLOCK);
RAW_BYTES_PER_DECODE_BLOCK -
RAW_BYTES_PER_DECODE_BLOCK) %