crypto: hash - Add statesize to crypto_ahash

As ahash drivers may need to use fallbacks, their state size
is thus variable.  Deal with this by making it an attribute
of crypto_ahash.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/ahash.c

@@ -432,6 +432,8 @@ static int crypto_ahash_init_tfm(struct crypto_tfm *tfm)
 
 	hash->setkey = ahash_nosetkey;
 
+	crypto_ahash_set_statesize(hash, alg->halg.statesize);
+
 	if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
 		return crypto_init_shash_ops_async(tfm);
 
@@ -573,6 +575,7 @@ struct crypto_ahash *crypto_clone_ahash(struct crypto_ahash *hash)
 	nhash->import = hash->import;
 	nhash->setkey = hash->setkey;
 	nhash->reqsize = hash->reqsize;
+	nhash->statesize = hash->statesize;
 
 	if (tfm->__crt_alg->cra_type != &crypto_ahash_type)
 		return crypto_clone_shash_ops_async(nhash, hash);

include/crypto/hash.h

@@ -260,6 +260,7 @@ struct crypto_ahash {
 	int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
 		      unsigned int keylen);
 
+	unsigned int statesize;
 	unsigned int reqsize;
 	struct crypto_tfm base;
 };
@@ -400,7 +401,7 @@ static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm)
  */
 static inline unsigned int crypto_ahash_statesize(struct crypto_ahash *tfm)
 {
-	return crypto_hash_alg_common(tfm)->statesize;
+	return tfm->statesize;
 }
 
 static inline u32 crypto_ahash_get_flags(struct crypto_ahash *tfm)

include/crypto/internal/hash.h

@@ -149,6 +149,12 @@ static inline struct ahash_alg *__crypto_ahash_alg(struct crypto_alg *alg)
 			    halg);
 }
 
+static inline void crypto_ahash_set_statesize(struct crypto_ahash *tfm,
+					      unsigned int size)
+{
+	tfm->statesize = size;
+}
+
 static inline void crypto_ahash_set_reqsize(struct crypto_ahash *tfm,
 					    unsigned int reqsize)
 {