[PATCH 2/6] crypto: ahash - Add helper to free single spawn instance

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

This patch adds ahash_free_singlespawn_instance which is the
ahash counterpart to the shash helper.

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

 crypto/ahash.c                 |    7 +++++++
 include/crypto/internal/hash.h |    1 +
 2 files changed, 8 insertions(+)

diff --git a/crypto/ahash.c b/crypto/ahash.c
index 68a0f0cb75c4c..3398e43d66f01 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -678,5 +678,12 @@ bool crypto_hash_alg_has_setkey(struct hash_alg_common *halg)
 }
 EXPORT_SYMBOL_GPL(crypto_hash_alg_has_setkey);
 
+void ahash_free_singlespawn_instance(struct ahash_instance *inst)
+{
+	crypto_drop_spawn(ahash_instance_ctx(inst));
+	kfree(inst);
+}
+EXPORT_SYMBOL_GPL(ahash_free_singlespawn_instance);
+
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Asynchronous cryptographic hash type");
diff --git a/include/crypto/internal/hash.h b/include/crypto/internal/hash.h
index 89f6f46ab2b8b..12665b72672d3 100644
--- a/include/crypto/internal/hash.h
+++ b/include/crypto/internal/hash.h
@@ -87,6 +87,7 @@ int crypto_register_ahashes(struct ahash_alg *algs, int count);
 void crypto_unregister_ahashes(struct ahash_alg *algs, int count);
 int ahash_register_instance(struct crypto_template *tmpl,
 			    struct ahash_instance *inst);
+void ahash_free_singlespawn_instance(struct ahash_instance *inst);
 
 int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
 		    unsigned int keylen);