rem: static s32 __card_getcntrlblock(u32 chn,card_block **card)
add: static s32 __card_getcntrlblock(s32 chn,card_block **card)
context: static s32 __card_getcntrlblock(u32 chn,card_block **card){	s32 ret;	u32 level;	card_block *rcard = NULL;	if(chn<EXI_CHANNEL_0 || chn>=EXI_CHANNEL_2) return CARD_ERROR_FATAL_ERROR;	_CPU_ISR_Disable(level);	rcard = &cardmap[chn];	if(!rcard->attached) {		_CPU_ISR_Restore(level);		return CARD_ERROR_NOCARD;		}	ret = CARD_ERROR_BUSY;	if(rcard->result!=CARD_ERROR_BUSY) {		rcard->result = CARD_ERROR_BUSY;		rcard->card_api_cb = NULL;		*card = rcard;		ret = CARD_ERROR_READY;	}	_CPU_ISR_Restore(level);	return ret;}