crypto: algapi - fold crypto_init_spawn() into crypto_grab_spawn()

Now that crypto_init_spawn() is only called by crypto_grab_spawn(),
simplify things by moving its functionality into crypto_grab_spawn().

In the process of doing this, also be more consistent about when the
spawn and instance are updated, and remove the crypto_spawn::dropref
flag since now it's always set.
Signed-off-by: NEric Biggers <ebiggers@google.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

crypto/algapi.c

@@ -629,7 +629,6 @@ int crypto_register_instance(struct crypto_template *tmpl,
 		spawn->inst = inst;
 		spawn->registered = true;
 
-		if (spawn->dropref)
 		crypto_mod_put(spawn->alg);
 
 		spawn = next;
@@ -672,47 +671,33 @@ void crypto_unregister_instance(struct crypto_instance *inst)
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_instance);
 
-int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
-		      struct crypto_instance *inst, u32 mask)
+int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
+		      const char *name, u32 type, u32 mask)
 {
+	struct crypto_alg *alg;
 	int err = -EAGAIN;
 
 	if (WARN_ON_ONCE(inst == NULL))
 		return -EINVAL;
 
-	spawn->next = inst->spawns;
-	inst->spawns = spawn;
+	/* Allow the result of crypto_attr_alg_name() to be passed directly */
+	if (IS_ERR(name))
+		return PTR_ERR(name);
 
-	spawn->mask = mask;
+	alg = crypto_find_alg(name, spawn->frontend, type, mask);
+	if (IS_ERR(alg))
+		return PTR_ERR(alg);
 
 	down_write(&crypto_alg_sem);
 	if (!crypto_is_moribund(alg)) {
 		list_add(&spawn->list, &alg->cra_users);
 		spawn->alg = alg;
+		spawn->mask = mask;
+		spawn->next = inst->spawns;
+		inst->spawns = spawn;
 		err = 0;
 	}
 	up_write(&crypto_alg_sem);
-
-	return err;
-}
-EXPORT_SYMBOL_GPL(crypto_init_spawn);
-
-int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
-		      const char *name, u32 type, u32 mask)
-{
-	struct crypto_alg *alg;
-	int err;
-
-	/* Allow the result of crypto_attr_alg_name() to be passed directly */
-	if (IS_ERR(name))
-		return PTR_ERR(name);
-
-	alg = crypto_find_alg(name, spawn->frontend, type, mask);
-	if (IS_ERR(alg))
-		return PTR_ERR(alg);
-
-	spawn->dropref = true;
-	err = crypto_init_spawn(spawn, alg, inst, mask);
 	if (err)
 		crypto_mod_put(alg);
 	return err;
@@ -729,7 +714,7 @@ void crypto_drop_spawn(struct crypto_spawn *spawn)
 		list_del(&spawn->list);
 	up_write(&crypto_alg_sem);
 
-	if (spawn->dropref && !spawn->registered)
+	if (!spawn->registered)
 		crypto_mod_put(spawn->alg);
 }
 EXPORT_SYMBOL_GPL(crypto_drop_spawn);

include/crypto/algapi.h

@@ -82,7 +82,6 @@ struct crypto_spawn {
 	const struct crypto_type *frontend;
 	u32 mask;
 	bool dead;
-	bool dropref;
 	bool registered;
 };
 
@@ -111,8 +110,6 @@ int crypto_register_instance(struct crypto_template *tmpl,
 			     struct crypto_instance *inst);
 void crypto_unregister_instance(struct crypto_instance *inst);
 
-int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
-		      struct crypto_instance *inst, u32 mask);
 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
 		      const char *name, u32 type, u32 mask);
 void crypto_drop_spawn(struct crypto_spawn *spawn);