snprintf(host->host_name, sizeof(host->host_name), "mmc%d", host_num++);
ret = mmc_add_host_sysfs(host); if (ret == 0) { mmc_power_off(host); mmc_detect_change(host); }
int mmc_add_host(struct mmc_host *host){	static unsigned int host_num;	snprintf(host->host_name, sizeof(host->host_name),		 "mmc%d", host_num++);	mmc_power_off(host);	mmc_detect_change(host);	return 0;}