crypto: api - Add crypto_grab_spawn primitive

This patch adds a new primitive crypto_grab_spawn which is meant
to replace crypto_init_spawn and crypto_init_spawn2.  Under the
new scheme the user no longer has to worry about reference counting
the alg object before it is subsumed by the spawn.

It is pretty much an exact copy of crypto_grab_aead.

Prior to calling this function spawn->frontend and spawn->inst
must have been set.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit d6ef2f198d4c9d95b77ee4918b97fc8a53c8a7b7)

Orabug: 24614549

Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>

diff --git a/crypto/algapi.c b/crypto/algapi.c
index 3103e6a1282e6cf6fd22f353a9fae956a029fe18..abf100c054e0a3472eb6f3de0fdd3e98171fbcbf 100644 (file)
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -612,6 +612,22 @@ out:
 }
 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 
+int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
+                     u32 type, u32 mask)
+{
+       struct crypto_alg *alg;
+       int err;
+
+       alg = crypto_find_alg(name, spawn->frontend, type, mask);
+       if (IS_ERR(alg))
+               return PTR_ERR(alg);
+
+       err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
+       crypto_mod_put(alg);
+       return err;
+}
+EXPORT_SYMBOL_GPL(crypto_grab_spawn);
+
 void crypto_drop_spawn(struct crypto_spawn *spawn)
 {
        if (!spawn->alg)

diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 0ecb7688af71aa28496404ddbcdbfafdcb45ce6e..a949bf70983b8a7234091415495a92e1ed03163c 100644 (file)
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -144,6 +144,8 @@ int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
                       struct crypto_instance *inst,
                       const struct crypto_type *frontend);
+int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
+                     u32 type, u32 mask);
 
 void crypto_drop_spawn(struct crypto_spawn *spawn);
 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,