[PATCH 4/6] crypto: ahash - Add ahash_alg_instance

["Herbert Xu" <herbert@gondor.apana.org.au>]

This patch adds the helper ahash_alg_instance which is used to
convert a crypto_ahash object into its corresponding ahash_instance.

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

 include/crypto/internal/hash.h |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
index 12665b72672d3..a6fbc4363e5e1 100644
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -178,6 +178,12 @@ static inline struct ahash_instance *ahash_instance(
 	return container_of(inst, struct ahash_instance, s.base);
 }
 
+static inline struct ahash_instance *ahash_alg_instance(
+	struct crypto_ahash *ahash)
+{
+	return ahash_instance(crypto_tfm_alg_instance(&ahash->base));
+}
+
 static inline void *ahash_instance_ctx(struct ahash_instance *inst)
 {
 	return crypto_instance_ctx(ahash_crypto_instance(inst));