[CRYPTO] api: Add type-safe spawns

This patch allows spawns of specific types (e.g., cipher) to be allocated.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 5 deletions

diff --git a/crypto/lrw.c b/crypto/lrw.c
index 56642586d84f..b4105080ac7a 100644
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -201,21 +201,22 @@ static int decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
 
 static int init_tfm(struct crypto_tfm *tfm)
 {
+        struct crypto_cipher *cipher;
         struct crypto_instance *inst = (void *)tfm->__crt_alg;
         struct crypto_spawn *spawn = crypto_instance_ctx(inst);
         struct priv *ctx = crypto_tfm_ctx(tfm);
         u32 *flags = &tfm->crt_flags;
 
-        tfm = crypto_spawn_tfm(spawn);
-        if (IS_ERR(tfm))
-                return PTR_ERR(tfm);
+        cipher = crypto_spawn_cipher(spawn);
+        if (IS_ERR(cipher))
+                return PTR_ERR(cipher);
 
-        if (crypto_tfm_alg_blocksize(tfm) != 16) {
+        if (crypto_cipher_blocksize(cipher) != 16) {
                 *flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
                 return -EINVAL;
         }
 
-        ctx->child = crypto_cipher_cast(tfm);
+        ctx->child = cipher;
         return 0;
 }