Hi Yang,

>  /*
> + * According to TS 102.223 Section 8.68, remote entity address can be
>  either + * 6-bytes IEEE-802 address, or 4-bytes IrDA device address. So
>  the maximum + * size of address is 6 bytes.
> + */
> +struct stk_remote_entity_address {
> +	unsigned char coding_type;
> +	unsigned char addr[6];
> +};
> +

I suggest you use a union here, see stk_other_address for an idea.

Regards,
-Denis