crypto: skcipher - Move IV generators into their own modules

This patch moves the default IV generators into their own modules
in order to break a dependency loop between cryptomgr, rng, and
blkcipher.

Signed-off-by: Herbert Xu <[e-mail]>

crypto/Makefile

···
 
 crypto_blkcipher-objs := ablkcipher.o
 crypto_blkcipher-objs += blkcipher.o
-crypto_blkcipher-objs += chainiv.o
-crypto_blkcipher-objs += eseqiv.o
 obj-$(CONFIG_CRYPTO_BLKCIPHER) += crypto_blkcipher.o
+obj-$(CONFIG_CRYPTO_BLKCIPHER) += chainiv.o
+obj-$(CONFIG_CRYPTO_BLKCIPHER) += eseqiv.o
 obj-$(CONFIG_CRYPTO_SEQIV) += seqiv.o
 
 crypto_hash-objs := hash.o

crypto/blkcipher.c

···
 }
 EXPORT_SYMBOL_GPL(skcipher_geniv_exit);
 
-static int __init blkcipher_module_init(void)
-{
-	int err;
-
-	err = chainiv_module_init();
-	if (err)
-		goto out;
-
-	err = eseqiv_module_init();
-	if (err)
-		goto eseqiv_err;
-
-out:
-	return err;
-
-eseqiv_err:
-	chainiv_module_exit();
-	goto out;
-}
-
-static void __exit blkcipher_module_exit(void)
-{
-	eseqiv_module_exit();
-	chainiv_module_exit();
-}
-
-module_init(blkcipher_module_init);
-module_exit(blkcipher_module_exit);
-
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Generic block chaining cipher type");

crypto/chainiv.c

···
 	.module = THIS_MODULE,
 };
 
-int __init chainiv_module_init(void)
+static int __init chainiv_module_init(void)
 {
 	return crypto_register_template(&chainiv_tmpl);
 }
 
-void chainiv_module_exit(void)
+static void chainiv_module_exit(void)
 {
 	crypto_unregister_template(&chainiv_tmpl);
 }
+
+module_init(chainiv_module_init);
+module_exit(chainiv_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Chain IV Generator");

crypto/eseqiv.c

···
 	.module = THIS_MODULE,
 };
 
-int __init eseqiv_module_init(void)
+static int __init eseqiv_module_init(void)
 {
 	return crypto_register_template(&eseqiv_tmpl);
 }
 
-void __exit eseqiv_module_exit(void)
+static void __exit eseqiv_module_exit(void)
 {
 	crypto_unregister_template(&eseqiv_tmpl);
 }
+
+module_init(eseqiv_module_init);
+module_exit(eseqiv_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Encrypted Sequence Number IV Generator");

include/crypto/internal/skcipher.h

···
 
 #include <crypto/algapi.h>
 #include <crypto/skcipher.h>
-#include <linux/init.h>
 #include <linux/types.h>
 
 struct rtattr;
···
 void skcipher_geniv_free(struct crypto_instance *inst);
 int skcipher_geniv_init(struct crypto_tfm *tfm);
 void skcipher_geniv_exit(struct crypto_tfm *tfm);
-
-int __init eseqiv_module_init(void);
-void __exit eseqiv_module_exit(void);
-int __init chainiv_module_init(void);
-void chainiv_module_exit(void);
 
 static inline struct crypto_ablkcipher *skcipher_geniv_cipher(
 	struct crypto_ablkcipher *geniv)