Subject: [RFC PATCH 12/21] crypto: lz4 - drop obsolete 'comp' implementation

From: Ard Biesheuvel <[email-masked]>
Date: Tue, 18 Jul 2023 14:58:38 +0200

The 'comp' API is obsolete and will be removed, so remove this comp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

Signed-off-by: Ard Biesheuvel <[email-masked]>
---
 crypto/lz4.c | 61 +-------------------
 1 file changed, 1 insertion(+), 60 deletions(-)

diff --git a/crypto/lz4.c b/crypto/lz4.c
index 0606f8862e7872ad..c46b6cbd91ce10c0 100644
--- a/crypto/lz4.c
+++ b/crypto/lz4.c
@@ -27,29 +27,11 @@ static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
 	return ctx;
 }
 
-static int lz4_init(struct crypto_tfm *tfm)
-{
-	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	ctx->lz4_comp_mem = lz4_alloc_ctx(NULL);
-	if (IS_ERR(ctx->lz4_comp_mem))
-		return -ENOMEM;
-
-	return 0;
-}
-
 static void lz4_free_ctx(struct crypto_scomp *tfm, void *ctx)
 {
 	vfree(ctx);
 }
 
-static void lz4_exit(struct crypto_tfm *tfm)
-{
-	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	lz4_free_ctx(NULL, ctx->lz4_comp_mem);
-}
-
 static int __lz4_compress_crypto(const u8 *src, unsigned int slen,
 				 u8 *dst, unsigned int *dlen, void *ctx)
 {
@@ -70,14 +52,6 @@ static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
 	return __lz4_compress_crypto(src, slen, dst, dlen, ctx);
 }
 
-static int lz4_compress_crypto(struct crypto_tfm *tfm, const u8 *src,
-			       unsigned int slen, u8 *dst, unsigned int *dlen)
-{
-	struct lz4_ctx *ctx = crypto_tfm_ctx(tfm);
-
-	return __lz4_compress_crypto(src, slen, dst, dlen, ctx->lz4_comp_mem);
-}
-
 static int __lz4_decompress_crypto(const u8 *src, unsigned int slen,
 				   u8 *dst, unsigned int *dlen, void *ctx)
 {
@@ -97,26 +71,6 @@ static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
 	return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
 }
 
-static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
-				 unsigned int slen, u8 *dst,
-				 unsigned int *dlen)
-{
-	return __lz4_decompress_crypto(src, slen, dst, dlen, NULL);
-}
-
-static struct crypto_alg alg_lz4 = {
-	.cra_name		= "lz4",
-	.cra_driver_name	= "lz4-generic",
-	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
-	.cra_ctxsize		= sizeof(struct lz4_ctx),
-	.cra_module		= THIS_MODULE,
-	.cra_init		= lz4_init,
-	.cra_exit		= lz4_exit,
-	.cra_u			= { .compress = {
-	.coa_compress		= lz4_compress_crypto,
-	.coa_decompress		= lz4_decompress_crypto } }
-};
-
 static struct scomp_alg scomp = {
 	.alloc_ctx		= lz4_alloc_ctx,
 	.free_ctx		= lz4_free_ctx,
@@ -131,24 +85,11 @@ static struct scomp_alg scomp = {
 
 static int __init lz4_mod_init(void)
 {
-	int ret;
-
-	ret = crypto_register_alg(&alg_lz4);
-	if (ret)
-		return ret;
-
-	ret = crypto_register_scomp(&scomp);
-	if (ret) {
-		crypto_unregister_alg(&alg_lz4);
-		return ret;
-	}
-
-	return ret;
+	return crypto_register_scomp(&scomp);
 }
 
 static void __exit lz4_mod_fini(void)
 {
-	crypto_unregister_alg(&alg_lz4);
 	crypto_unregister_scomp(&scomp);
 }
 
-- 
2.39.2