read_transfer_counter
num_bytes = block_size - read_transfer_counter(a_priv);
static int read_transfer_counter(struct agilent_82350b_priv *a_priv);
count = block_size - read_transfer_counter(a_priv);
count = block_size - read_transfer_counter(hp_priv);
*bytes_written += block_size - read_transfer_counter(hp_priv);
static int read_transfer_counter(struct hp_82341_priv *hp_priv);