crypto: algapi - pass instance to crypto_grab_spawn()

Currently, crypto_spawn::inst is first used temporarily to pass the
instance to crypto_grab_spawn().  Then crypto_init_spawn() overwrites it
with crypto_spawn::next, which shares the same union.  Finally,
crypto_spawn::inst is set again when the instance is registered.

Make this less convoluted by just passing the instance as an argument to
crypto_grab_spawn() instead.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/adiantum.c

@@ -542,9 +542,9 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
 	streamcipher_alg = crypto_spawn_skcipher_alg(&ictx->streamcipher_spawn);
 
 	/* Block cipher, e.g. "aes" */
-	crypto_set_spawn(&ictx->blockcipher_spawn,
-			 skcipher_crypto_instance(inst));
-	err = crypto_grab_spawn(&ictx->blockcipher_spawn, blockcipher_name,
+	err = crypto_grab_spawn(&ictx->blockcipher_spawn,
+				skcipher_crypto_instance(inst),
+				blockcipher_name,
 				CRYPTO_ALG_TYPE_CIPHER, CRYPTO_ALG_TYPE_MASK);
 	if (err)
 		goto out_drop_streamcipher;

crypto/aead.c

@@ -211,9 +211,8 @@ int crypto_grab_aead(struct crypto_aead_spawn *spawn,
 		     struct crypto_instance *inst,
 		     const char *name, u32 type, u32 mask)
 {
-	spawn->base.inst = inst;
 	spawn->base.frontend = &crypto_aead_type;
-	return crypto_grab_spawn(&spawn->base, name, type, mask);
+	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
 }
 EXPORT_SYMBOL_GPL(crypto_grab_aead);
 

crypto/akcipher.c

@@ -94,9 +94,8 @@ int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn,
 			 struct crypto_instance *inst,
 			 const char *name, u32 type, u32 mask)
 {
-	spawn->base.inst = inst;
 	spawn->base.frontend = &crypto_akcipher_type;
-	return crypto_grab_spawn(&spawn->base, name, type, mask);
+	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
 }
 EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
 

crypto/algapi.c

@@ -714,8 +714,8 @@ int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 }
 EXPORT_SYMBOL_GPL(crypto_init_spawn2);
 
-int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
-		      u32 type, 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;
@@ -729,7 +729,7 @@ int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 		return PTR_ERR(alg);
 
 	spawn->dropref = true;
-	err = crypto_init_spawn(spawn, alg, spawn->inst, mask);
+	err = crypto_init_spawn(spawn, alg, inst, mask);
 	if (err)
 		crypto_mod_put(alg);
 	return err;

crypto/skcipher.c

@@ -750,9 +750,8 @@ int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn,
 			 struct crypto_instance *inst,
 			 const char *name, u32 type, u32 mask)
 {
-	spawn->base.inst = inst;
 	spawn->base.frontend = &crypto_skcipher_type;
-	return crypto_grab_spawn(&spawn->base, name, type, mask);
+	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
 }
 EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
 

include/crypto/algapi.h

@@ -116,20 +116,14 @@ 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);
+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);
 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 				    u32 mask);
 void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
 
-static inline void crypto_set_spawn(struct crypto_spawn *spawn,
-				    struct crypto_instance *inst)
-{
-	spawn->inst = inst;
-}
-
 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
 int crypto_check_attr_type(struct rtattr **tb, u32 type);
 const char *crypto_attr_alg_name(struct rtattr *rta);