mmc_test_prepare_mrq
mmc_test_prepare_mrq(test, mrq, t->sg, t->sg_len, dev_addr, t->blocks,
mmc_test_prepare_mrq(test, &mrq, &sg, 1, addr, 1, blksz, write);
mmc_test_prepare_mrq(test, mrq, sg, t->sg_len, dev_addr,
mmc_test_prepare_mrq(test, &mrq, sg, sg_len, dev_addr,
mmc_test_prepare_mrq(test, &mrq, &sg, 1, 0, blocks, blksz, write);