[v2 PATCH 1/7] crypto: api - Add cra_type->destroy hook

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Add a cra_type->destroy hook so that resources can be freed after
the last user of a registered algorithm is gone.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---
 crypto/algapi.c   | 9 +++++++++
 crypto/internal.h | 6 ++++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/crypto/algapi.c b/crypto/algapi.c
index e7a9a2ada2cf..8f72dd15cf9c 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -89,6 +89,15 @@ static void crypto_destroy_instance(struct crypto_alg *alg)
 	schedule_work(&inst->free_work);
 }
 
+void crypto_destroy_alg(struct crypto_alg *alg)
+{
+	if (alg->cra_type && alg->cra_type->destroy)
+		alg->cra_type->destroy(alg);
+
+	if (alg->cra_destroy)
+		alg->cra_destroy(alg);
+}
+
 /*
  * This function adds a spawn to the list secondary_spawns which
  * will be used at the end of crypto_remove_spawns to unregister
diff --git a/crypto/internal.h b/crypto/internal.h
index 08d43b40e7db..11567ea24fc3 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -40,6 +40,7 @@ struct crypto_type {
 	void (*show)(struct seq_file *m, struct crypto_alg *alg);
 	int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
 	void (*free)(struct crypto_instance *inst);
+	void (*destroy)(struct crypto_alg *alg);
 
 	unsigned int type;
 	unsigned int maskclear;
@@ -127,6 +128,7 @@ void *crypto_create_tfm_node(struct crypto_alg *alg,
 			const struct crypto_type *frontend, int node);
 void *crypto_clone_tfm(const struct crypto_type *frontend,
 		       struct crypto_tfm *otfm);
+void crypto_destroy_alg(struct crypto_alg *alg);
 
 static inline void *crypto_create_tfm(struct crypto_alg *alg,
 			const struct crypto_type *frontend)
@@ -163,8 +165,8 @@ static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg)
 
 static inline void crypto_alg_put(struct crypto_alg *alg)
 {
-	if (refcount_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy)
-		alg->cra_destroy(alg);
+	if (refcount_dec_and_test(&alg->cra_refcnt))
+		crypto_destroy_alg(alg);
 }
 
 static inline int crypto_tmpl_get(struct crypto_template *tmpl)
-- 
2.39.5