static int __init aes_s390_init()

in crypto/aes_s390.c [987:1050]

• 56 lines of code
• 22 McCabe index (conditional complexity)

static int __init aes_s390_init(void)
{
	int ret;

	/* Query available functions for KM, KMC, KMCTR and KMA */
	cpacf_query(CPACF_KM, &km_functions);
	cpacf_query(CPACF_KMC, &kmc_functions);
	cpacf_query(CPACF_KMCTR, &kmctr_functions);
	cpacf_query(CPACF_KMA, &kma_functions);

	if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
	    cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
	    cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
		ret = crypto_register_alg(&aes_alg);
		if (ret)
			goto out_err;
		aes_s390_alg = &aes_alg;
		ret = aes_s390_register_skcipher(&ecb_aes_alg);
		if (ret)
			goto out_err;
	}

	if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
	    cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
	    cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
		ret = aes_s390_register_skcipher(&cbc_aes_alg);
		if (ret)
			goto out_err;
	}

	if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
	    cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
		ret = aes_s390_register_skcipher(&xts_aes_alg);
		if (ret)
			goto out_err;
	}

	if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
	    cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
	    cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
		ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
		if (!ctrblk) {
			ret = -ENOMEM;
			goto out_err;
		}
		ret = aes_s390_register_skcipher(&ctr_aes_alg);
		if (ret)
			goto out_err;
	}

	if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
	    cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
	    cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
		ret = crypto_register_aead(&gcm_aes_aead);
		if (ret)
			goto out_err;
		aes_s390_aead_alg = &gcm_aes_aead;
	}

	return 0;
out_err:
	aes_s390_fini();
	return ret;
}