Source of dm-verity-target.c - linux-imx - PHYTEC BitBucket (Stash)

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​x
 
        goto bad;
    }
​
    v->tfm = crypto_alloc_ahash(v->alg_name, 0, 0);
    if (IS_ERR(v->tfm)) {
        ti->error = "Cannot initialize hash function";
        r = PTR_ERR(v->tfm);
        v->tfm = NULL;
        goto bad;
    }
​
    /*
     * dm-verity performance can vary greatly depending on which hash
     * algorithm implementation is used.  Help people debug performance
     * problems by logging the ->cra_driver_name.
     */
    DMINFO("%s using implementation \"%s\"", v->alg_name,
           crypto_hash_alg_common(v->tfm)->base.cra_driver_name);
​
    v->digest_size = crypto_ahash_digestsize(v->tfm);
    if ((1 << v->hash_dev_block_bits) < v->digest_size * 2) {
        ti->error = "Digest size too big";
        r = -EINVAL;
        goto bad;
    }
    v->ahash_reqsize = sizeof(struct ahash_request) +
        crypto_ahash_reqsize(v->tfm);
​
    v->root_digest = kmalloc(v->digest_size, GFP_KERNEL);