[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, 5 insertions, 4 deletions

diff --git a/crypto/cbc.c b/crypto/cbc.c
index f5542b4db387..136fea7e7000 100644
--- a/crypto/cbc.c
+++ b/crypto/cbc.c
@@ -243,6 +243,7 @@ static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
         struct crypto_instance *inst = (void *)tfm->__crt_alg;
         struct crypto_spawn *spawn = crypto_instance_ctx(inst);
         struct crypto_cbc_ctx *ctx = crypto_tfm_ctx(tfm);
+        struct crypto_cipher *cipher;
 
         switch (crypto_tfm_alg_blocksize(tfm)) {
         case 8:
@@ -260,11 +261,11 @@ static int crypto_cbc_init_tfm(struct crypto_tfm *tfm)
                         ctx->xor = xor_quad;
         }
 
-        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);
 
-        ctx->child = crypto_cipher_cast(tfm);
+        ctx->child = cipher;
         return 0;
 }