Subject: [RFC PATCH 16/21] crypto: zstd - drop obsolete 'comp' implementation

From: Ard Biesheuvel <[email-masked]>
Date: Tue, 18 Jul 2023 14:58:42 +0200

The 'comp' API is obsolete and will be removed, so remove this comp
implementation.

Signed-off-by: Ard Biesheuvel <[email-masked]>
---
 crypto/zstd.c | 56 +-------------------
 1 file changed, 1 insertion(+), 55 deletions(-)

diff --git a/crypto/zstd.c b/crypto/zstd.c
index 154a969c83a82277..c6e6f135c5812c9c 100644
--- a/crypto/zstd.c
+++ b/crypto/zstd.c
@@ -121,13 +121,6 @@ static void *zstd_alloc_ctx(struct crypto_scomp *tfm)
 	return ctx;
 }
 
-static int zstd_init(struct crypto_tfm *tfm)
-{
-	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	return __zstd_init(ctx);
-}
-
 static void __zstd_exit(void *ctx)
 {
 	zstd_comp_exit(ctx);
@@ -140,13 +133,6 @@ static void zstd_free_ctx(struct crypto_scomp *tfm, void *ctx)
 	kfree_sensitive(ctx);
 }
 
-static void zstd_exit(struct crypto_tfm *tfm)
-{
-	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	__zstd_exit(ctx);
-}
-
 static int __zstd_compress(const u8 *src, unsigned int slen,
 			   u8 *dst, unsigned int *dlen, void *ctx)
 {
@@ -161,14 +147,6 @@ static int __zstd_compress(const u8 *src, unsigned int slen,
 	return 0;
 }
 
-static int zstd_compress(struct crypto_tfm *tfm, const u8 *src,
-			 unsigned int slen, u8 *dst, unsigned int *dlen)
-{
-	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	return __zstd_compress(src, slen, dst, dlen, ctx);
-}
-
 static int zstd_scompress(struct crypto_scomp *tfm, const u8 *src,
 			  unsigned int slen, u8 *dst, unsigned int *dlen,
 			  void *ctx)
@@ -189,14 +167,6 @@ static int __zstd_decompress(const u8 *src, unsigned int slen,
 	return 0;
 }
 
-static int zstd_decompress(struct crypto_tfm *tfm, const u8 *src,
-			   unsigned int slen, u8 *dst, unsigned int *dlen)
-{
-	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	return __zstd_decompress(src, slen, dst, dlen, ctx);
-}
-
 static int zstd_sdecompress(struct crypto_scomp *tfm, const u8 *src,
 			    unsigned int slen, u8 *dst, unsigned int *dlen,
 			    void *ctx)
@@ -204,19 +174,6 @@ static int zstd_sdecompress(struct crypto_scomp *tfm, const u8 *src,
 	return __zstd_decompress(src, slen, dst, dlen, ctx);
 }
 
-static struct crypto_alg alg = {
-	.cra_name		= "zstd",
-	.cra_driver_name	= "zstd-generic",
-	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
-	.cra_ctxsize		= sizeof(struct zstd_ctx),
-	.cra_module		= THIS_MODULE,
-	.cra_init		= zstd_init,
-	.cra_exit		= zstd_exit,
-	.cra_u			= { .compress = {
-	.coa_compress		= zstd_compress,
-	.coa_decompress		= zstd_decompress } }
-};
-
 static struct scomp_alg scomp = {
 	.alloc_ctx		= zstd_alloc_ctx,
 	.free_ctx		= zstd_free_ctx,
@@ -231,22 +188,11 @@ static struct scomp_alg scomp = {
 
 static int __init zstd_mod_init(void)
 {
-	int ret;
-
-	ret = crypto_register_alg(&alg);
-	if (ret)
-		return ret;
-
-	ret = crypto_register_scomp(&scomp);
-	if (ret)
-		crypto_unregister_alg(&alg);
-
-	return ret;
+	return crypto_register_scomp(&scomp);
 }
 
 static void __exit zstd_mod_fini(void)
 {
-	crypto_unregister_alg(&alg);
 	crypto_unregister_scomp(&scomp);
 }
 
-- 
2.39.2