From 62a465c25e99b9a98259a6b7f5bb759f5296d501 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Wed, 30 Aug 2023 17:56:25 +0800
Subject: crypto: deflate - Remove zlib-deflate

Remove the implementation of zlib-deflate because it is completely
unused in the kernel.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
---
 crypto/deflate.c | 61 ++++++++++++++++----------------------------------------
 1 file changed, 17 insertions(+), 44 deletions(-)

(limited to 'crypto')

diff --git a/crypto/deflate.c b/crypto/deflate.c
index b2a46f6dc961e7..6e31e0db0e8659 100644
--- a/crypto/deflate.c
+++ b/crypto/deflate.c
@@ -39,24 +39,20 @@ struct deflate_ctx {
 	struct z_stream_s decomp_stream;
 };
 
-static int deflate_comp_init(struct deflate_ctx *ctx, int format)
+static int deflate_comp_init(struct deflate_ctx *ctx)
 {
 	int ret = 0;
 	struct z_stream_s *stream = &ctx->comp_stream;
 
 	stream->workspace = vzalloc(zlib_deflate_workspacesize(
-				    MAX_WBITS, MAX_MEM_LEVEL));
+				    -DEFLATE_DEF_WINBITS, MAX_MEM_LEVEL));
 	if (!stream->workspace) {
 		ret = -ENOMEM;
 		goto out;
 	}
-	if (format)
-		ret = zlib_deflateInit(stream, 3);
-	else
-		ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED,
-					-DEFLATE_DEF_WINBITS,
-					DEFLATE_DEF_MEMLEVEL,
-					Z_DEFAULT_STRATEGY);
+	ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED,
+				-DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL,
+				Z_DEFAULT_STRATEGY);
 	if (ret != Z_OK) {
 		ret = -EINVAL;
 		goto out_free;
@@ -68,7 +64,7 @@ out_free:
 	goto out;
 }
 
-static int deflate_decomp_init(struct deflate_ctx *ctx, int format)
+static int deflate_decomp_init(struct deflate_ctx *ctx)
 {
 	int ret = 0;
 	struct z_stream_s *stream = &ctx->decomp_stream;
@@ -78,10 +74,7 @@ static int deflate_decomp_init(struct deflate_ctx *ctx, int format)
 		ret = -ENOMEM;
 		goto out;
 	}
-	if (format)
-		ret = zlib_inflateInit(stream);
-	else
-		ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
+	ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
 	if (ret != Z_OK) {
 		ret = -EINVAL;
 		goto out_free;
@@ -105,21 +98,21 @@ static void deflate_decomp_exit(struct deflate_ctx *ctx)
 	vfree(ctx->decomp_stream.workspace);
 }
 
-static int __deflate_init(void *ctx, int format)
+static int __deflate_init(void *ctx)
 {
 	int ret;
 
-	ret = deflate_comp_init(ctx, format);
+	ret = deflate_comp_init(ctx);
 	if (ret)
 		goto out;
-	ret = deflate_decomp_init(ctx, format);
+	ret = deflate_decomp_init(ctx);
 	if (ret)
 		deflate_comp_exit(ctx);
 out:
 	return ret;
 }
 
-static void *gen_deflate_alloc_ctx(struct crypto_scomp *tfm, int format)
+static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
 {
 	struct deflate_ctx *ctx;
 	int ret;
@@ -128,7 +121,7 @@ static void *gen_deflate_alloc_ctx(struct crypto_scomp *tfm, int format)
 	if (!ctx)
 		return ERR_PTR(-ENOMEM);
 
-	ret = __deflate_init(ctx, format);
+	ret = __deflate_init(ctx);
 	if (ret) {
 		kfree(ctx);
 		return ERR_PTR(ret);
@@ -137,21 +130,11 @@ static void *gen_deflate_alloc_ctx(struct crypto_scomp *tfm, int format)
 	return ctx;
 }
 
-static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
-{
-	return gen_deflate_alloc_ctx(tfm, 0);
-}
-
-static void *zlib_deflate_alloc_ctx(struct crypto_scomp *tfm)
-{
-	return gen_deflate_alloc_ctx(tfm, 1);
-}
-
 static int deflate_init(struct crypto_tfm *tfm)
 {
 	struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
 
-	return __deflate_init(ctx, 0);
+	return __deflate_init(ctx);
 }
 
 static void __deflate_exit(void *ctx)
@@ -286,7 +269,7 @@ static struct crypto_alg alg = {
 	.coa_decompress  	= deflate_decompress } }
 };
 
-static struct scomp_alg scomp[] = { {
+static struct scomp_alg scomp = {
 	.alloc_ctx		= deflate_alloc_ctx,
 	.free_ctx		= deflate_free_ctx,
 	.compress		= deflate_scompress,
@@ -296,17 +279,7 @@ static struct scomp_alg scomp[] = { {
 		.cra_driver_name = "deflate-scomp",
 		.cra_module	 = THIS_MODULE,
 	}
-}, {
-	.alloc_ctx		= zlib_deflate_alloc_ctx,
-	.free_ctx		= deflate_free_ctx,
-	.compress		= deflate_scompress,
-	.decompress		= deflate_sdecompress,
-	.base			= {
-		.cra_name	= "zlib-deflate",
-		.cra_driver_name = "zlib-deflate-scomp",
-		.cra_module	 = THIS_MODULE,
-	}
-} };
+};
 
 static int __init deflate_mod_init(void)
 {
@@ -316,7 +289,7 @@ static int __init deflate_mod_init(void)
 	if (ret)
 		return ret;
 
-	ret = crypto_register_scomps(scomp, ARRAY_SIZE(scomp));
+	ret = crypto_register_scomp(&scomp);
 	if (ret) {
 		crypto_unregister_alg(&alg);
 		return ret;
@@ -328,7 +301,7 @@ static int __init deflate_mod_init(void)
 static void __exit deflate_mod_fini(void)
 {
 	crypto_unregister_alg(&alg);
-	crypto_unregister_scomps(scomp, ARRAY_SIZE(scomp));
+	crypto_unregister_scomp(&scomp);
 }
 
 subsys_initcall(deflate_mod_init);
-- 
cgit 1.2.3-korg