kernel: remove ubifs xz decompression support

It has been unused, and less useful than squashfs for cases where flash
space usage matters.

Signed-off-by: Felix Fietkau <nbd@nbd.name>

9 files changed, 0 insertions, 719 deletions

diff --git a/target/linux/generic/config-3.18 b/target/linux/generic/config-3.18
index c61a4b35b4..3734416dfd 100644
--- a/target/linux/generic/config-3.18
+++ b/target/linux/generic/config-3.18
@@ -790,7 +790,6 @@ CONFIG_CRYPTO_PCRYPT=y
 # CONFIG_CRYPTO_WP512 is not set
 # CONFIG_CRYPTO_XCBC is not set
 # CONFIG_CRYPTO_XTS is not set
-# CONFIG_CRYPTO_XZ is not set
 # CONFIG_CRYPTO_ZLIB is not set
 # CONFIG_CRYSTALHD is not set
 # CONFIG_CS5535_MFGPT is not set
diff --git a/target/linux/generic/config-4.1 b/target/linux/generic/config-4.1
index 4fae342366..222ba260d9 100644
--- a/target/linux/generic/config-4.1
+++ b/target/linux/generic/config-4.1
@@ -822,7 +822,6 @@ CONFIG_CRYPTO_PCRYPT=y
 # CONFIG_CRYPTO_WP512 is not set
 # CONFIG_CRYPTO_XCBC is not set
 # CONFIG_CRYPTO_XTS is not set
-# CONFIG_CRYPTO_XZ is not set
 # CONFIG_CRYPTO_ZLIB is not set
 # CONFIG_CRYSTALHD is not set
 # CONFIG_CS5535_MFGPT is not set
diff --git a/target/linux/generic/config-4.4 b/target/linux/generic/config-4.4
index 8ce316b426..a654878753 100644
--- a/target/linux/generic/config-4.4
+++ b/target/linux/generic/config-4.4
@@ -823,7 +823,6 @@ CONFIG_CRYPTO_PCRYPT=y
 # CONFIG_CRYPTO_WP512 is not set
 # CONFIG_CRYPTO_XCBC is not set
 # CONFIG_CRYPTO_XTS is not set
-# CONFIG_CRYPTO_XZ is not set
 # CONFIG_CRYPTO_ZLIB is not set
 # CONFIG_CS5535_MFGPT is not set
 # CONFIG_CS89x0 is not set
diff --git a/target/linux/generic/patches-3.18/540-crypto-xz-decompression-support.patch b/target/linux/generic/patches-3.18/540-crypto-xz-decompression-support.patch
deleted file mode 100644
index 00b0b7cadd..0000000000
--- a/target/linux/generic/patches-3.18/540-crypto-xz-decompression-support.patch
+++ /dev/null
@@ -1,146 +0,0 @@
---- a/crypto/Kconfig
-+++ b/crypto/Kconfig
-@@ -1437,6 +1437,13 @@ config CRYPTO_LZ4HC
- 	help
- 	  This is the LZ4 high compression mode algorithm.
- 
-+config CRYPTO_XZ
-+	tristate "XZ compression algorithm"
-+	select CRYPTO_ALGAPI
-+	select XZ_DEC
-+	help
-+	  This is the XZ algorithm. Only decompression is supported for now.
-+
- comment "Random Number Generation"
- 
- config CRYPTO_ANSI_CPRNG
---- a/crypto/Makefile
-+++ b/crypto/Makefile
-@@ -89,6 +89,7 @@ obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.
- obj-$(CONFIG_CRYPTO_LZO) += lzo.o
- obj-$(CONFIG_CRYPTO_LZ4) += lz4.o
- obj-$(CONFIG_CRYPTO_LZ4HC) += lz4hc.o
-+obj-$(CONFIG_CRYPTO_XZ) += xz.o
- obj-$(CONFIG_CRYPTO_842) += 842.o
- obj-$(CONFIG_CRYPTO_RNG2) += rng.o
- obj-$(CONFIG_CRYPTO_RNG2) += krng.o
---- /dev/null
-+++ b/crypto/xz.c
-@@ -0,0 +1,117 @@
-+/*
-+ * Cryptographic API.
-+ *
-+ * XZ decompression support.
-+ *
-+ * Copyright (c) 2012 Gabor Juhos <juhosg@openwrt.org>
-+ *
-+ * This program is free software; you can redistribute it and/or modify it
-+ * under the terms of the GNU General Public License version 2 as published by
-+ * the Free Software Foundation.
-+ *
-+ */
-+#include <linux/init.h>
-+#include <linux/module.h>
-+#include <linux/crypto.h>
-+#include <linux/xz.h>
-+#include <linux/interrupt.h>
-+#include <linux/mm.h>
-+#include <linux/net.h>
-+
-+struct xz_comp_ctx {
-+	struct xz_dec	*decomp_state;
-+	struct xz_buf	decomp_buf;
-+};
-+
-+static int crypto_xz_decomp_init(struct xz_comp_ctx *ctx)
-+{
-+	ctx->decomp_state = xz_dec_init(XZ_SINGLE, 0);
-+	if (!ctx->decomp_state)
-+		return -ENOMEM;
-+
-+	return 0;
-+}
-+
-+static void crypto_xz_decomp_exit(struct xz_comp_ctx *ctx)
-+{
-+	xz_dec_end(ctx->decomp_state);
-+}
-+
-+static int crypto_xz_init(struct crypto_tfm *tfm)
-+{
-+	struct xz_comp_ctx *ctx = crypto_tfm_ctx(tfm);
-+
-+	return crypto_xz_decomp_init(ctx);
-+}
-+
-+static void crypto_xz_exit(struct crypto_tfm *tfm)
-+{
-+	struct xz_comp_ctx *ctx = crypto_tfm_ctx(tfm);
-+
-+	crypto_xz_decomp_exit(ctx);
-+}
-+
-+static int crypto_xz_compress(struct crypto_tfm *tfm, const u8 *src,
-+			      unsigned int slen, u8 *dst, unsigned int *dlen)
-+{
-+	return -EOPNOTSUPP;
-+}
-+
-+static int crypto_xz_decompress(struct crypto_tfm *tfm, const u8 *src,
-+				unsigned int slen, u8 *dst, unsigned int *dlen)
-+{
-+	struct xz_comp_ctx *dctx = crypto_tfm_ctx(tfm);
-+	struct xz_buf *xz_buf = &dctx->decomp_buf;
-+	int ret;
-+
-+	memset(xz_buf, '\0', sizeof(struct xz_buf));
-+
-+	xz_buf->in = (u8 *) src;
-+	xz_buf->in_pos = 0;
-+	xz_buf->in_size = slen;
-+	xz_buf->out = (u8 *) dst;
-+	xz_buf->out_pos = 0;
-+	xz_buf->out_size = *dlen;
-+
-+	ret = xz_dec_run(dctx->decomp_state, xz_buf);
-+	if (ret != XZ_STREAM_END) {
-+		ret = -EINVAL;
-+		goto out;
-+	}
-+
-+	*dlen = xz_buf->out_pos;
-+	ret = 0;
-+
-+out:
-+	return ret;
-+}
-+
-+static struct crypto_alg crypto_xz_alg = {
-+	.cra_name		= "xz",
-+	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
-+	.cra_ctxsize		= sizeof(struct xz_comp_ctx),
-+	.cra_module		= THIS_MODULE,
-+	.cra_list		= LIST_HEAD_INIT(crypto_xz_alg.cra_list),
-+	.cra_init		= crypto_xz_init,
-+	.cra_exit		= crypto_xz_exit,
-+	.cra_u			= { .compress = {
-+	.coa_compress 		= crypto_xz_compress,
-+	.coa_decompress  	= crypto_xz_decompress } }
-+};
-+
-+static int __init crypto_xz_mod_init(void)
-+{
-+	return crypto_register_alg(&crypto_xz_alg);
-+}
-+
-+static void __exit crypto_xz_mod_exit(void)
-+{
-+	crypto_unregister_alg(&crypto_xz_alg);
-+}
-+
-+module_init(crypto_xz_mod_init);
-+module_exit(crypto_xz_mod_exit);
-+
-+MODULE_LICENSE("GPL v2");
-+MODULE_DESCRIPTION("Crypto XZ decompression support");
-+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
diff --git a/target/linux/generic/patches-3.18/541-ubifs-xz-decompression-support.patch b/target/linux/generic/patches-3.18/541-ubifs-xz-decompression-support.patch
deleted file mode 100644
index f85689c586..0000000000
--- a/target/linux/generic/patches-3.18/541-ubifs-xz-decompression-support.patch
+++ /dev/null
@@ -1,92 +0,0 @@
---- a/fs/ubifs/Kconfig
-+++ b/fs/ubifs/Kconfig
-@@ -5,8 +5,10 @@ config UBIFS_FS
- 	select CRYPTO if UBIFS_FS_ADVANCED_COMPR
- 	select CRYPTO if UBIFS_FS_LZO
- 	select CRYPTO if UBIFS_FS_ZLIB
-+	select CRYPTO if UBIFS_FS_XZ
- 	select CRYPTO_LZO if UBIFS_FS_LZO
- 	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
-+	select CRYPTO_XZ if UBIFS_FS_XZ
- 	depends on MTD_UBI
- 	help
- 	  UBIFS is a file system for flash devices which works on top of UBI.
-@@ -35,3 +37,12 @@ config UBIFS_FS_ZLIB
- 	default y
- 	help
- 	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
-+
-+config UBIFS_FS_XZ
-+	bool "XZ decompression support" if UBIFS_FS_ADVANCED_COMPR
-+	depends on UBIFS_FS
-+	default y
-+	help
-+	  XZ compresses better the ZLIB but it is slower..
-+	  Say 'Y' if unsure.
-+
---- a/fs/ubifs/compress.c
-+++ b/fs/ubifs/compress.c
-@@ -71,6 +71,24 @@ static struct ubifs_compressor zlib_comp
- };
- #endif
- 
-+#ifdef CONFIG_UBIFS_FS_XZ
-+static DEFINE_MUTEX(xz_enc_mutex);
-+static DEFINE_MUTEX(xz_dec_mutex);
-+
-+static struct ubifs_compressor xz_compr = {
-+	.compr_type = UBIFS_COMPR_XZ,
-+	.comp_mutex = &xz_enc_mutex,
-+	.decomp_mutex = &xz_dec_mutex,
-+	.name = "xz",
-+	.capi_name = "xz",
-+};
-+#else
-+static struct ubifs_compressor xz_compr = {
-+	.compr_type = UBIFS_COMPR_XZ,
-+	.name = "xz",
-+};
-+#endif
-+
- /* All UBIFS compressors */
- struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
- 
-@@ -232,9 +250,15 @@ int __init ubifs_compressors_init(void)
- 	if (err)
- 		goto out_lzo;
- 
-+	err = compr_init(&xz_compr);
-+	if (err)
-+		goto out_zlib;
-+
- 	ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
- 	return 0;
- 
-+out_zlib:
-+	compr_exit(&zlib_compr);
- out_lzo:
- 	compr_exit(&lzo_compr);
- 	return err;
-@@ -247,4 +271,5 @@ void ubifs_compressors_exit(void)
- {
- 	compr_exit(&lzo_compr);
- 	compr_exit(&zlib_compr);
-+	compr_exit(&xz_compr);
- }
---- a/fs/ubifs/ubifs-media.h
-+++ b/fs/ubifs/ubifs-media.h
-@@ -332,12 +332,14 @@ enum {
-  * UBIFS_COMPR_NONE: no compression
-  * UBIFS_COMPR_LZO: LZO compression
-  * UBIFS_COMPR_ZLIB: ZLIB compression
-+ * UBIFS_COMPR_XZ: XZ compression
-  * UBIFS_COMPR_TYPES_CNT: count of supported compression types
-  */
- enum {
- 	UBIFS_COMPR_NONE,
- 	UBIFS_COMPR_LZO,
- 	UBIFS_COMPR_ZLIB,
-+	UBIFS_COMPR_XZ,
- 	UBIFS_COMPR_TYPES_CNT,
- };
- 
diff --git a/target/linux/generic/patches-4.1/540-crypto-xz-decompression-support.patch b/target/linux/generic/patches-4.1/540-crypto-xz-decompression-support.patch
deleted file mode 100644
index c250e9f024..0000000000
--- a/target/linux/generic/patches-4.1/540-crypto-xz-decompression-support.patch
+++ /dev/null
@@ -1,146 +0,0 @@
---- a/crypto/Kconfig
-+++ b/crypto/Kconfig
-@@ -1435,6 +1435,13 @@ config CRYPTO_LZ4HC
- 	help
- 	  This is the LZ4 high compression mode algorithm.
- 
-+config CRYPTO_XZ
-+	tristate "XZ compression algorithm"
-+	select CRYPTO_ALGAPI
-+	select XZ_DEC
-+	help
-+	  This is the XZ algorithm. Only decompression is supported for now.
-+
- comment "Random Number Generation"
- 
- config CRYPTO_ANSI_CPRNG
---- a/crypto/Makefile
-+++ b/crypto/Makefile
-@@ -89,6 +89,7 @@ obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.
- obj-$(CONFIG_CRYPTO_LZO) += lzo.o
- obj-$(CONFIG_CRYPTO_LZ4) += lz4.o
- obj-$(CONFIG_CRYPTO_LZ4HC) += lz4hc.o
-+obj-$(CONFIG_CRYPTO_XZ) += xz.o
- obj-$(CONFIG_CRYPTO_842) += 842.o
- obj-$(CONFIG_CRYPTO_RNG2) += rng.o
- obj-$(CONFIG_CRYPTO_RNG2) += krng.o
---- /dev/null
-+++ b/crypto/xz.c
-@@ -0,0 +1,117 @@
-+/*
-+ * Cryptographic API.
-+ *
-+ * XZ decompression support.
-+ *
-+ * Copyright (c) 2012 Gabor Juhos <juhosg@openwrt.org>
-+ *
-+ * This program is free software; you can redistribute it and/or modify it
-+ * under the terms of the GNU General Public License version 2 as published by
-+ * the Free Software Foundation.
-+ *
-+ */
-+#include <linux/init.h>
-+#include <linux/module.h>
-+#include <linux/crypto.h>
-+#include <linux/xz.h>
-+#include <linux/interrupt.h>
-+#include <linux/mm.h>
-+#include <linux/net.h>
-+
-+struct xz_comp_ctx {
-+	struct xz_dec	*decomp_state;
-+	struct xz_buf	decomp_buf;
-+};
-+
-+static int crypto_xz_decomp_init(struct xz_comp_ctx *ctx)
-+{
-+	ctx->decomp_state = xz_dec_init(XZ_SINGLE, 0);
-+	if (!ctx->decomp_state)
-+		return -ENOMEM;
-+
-+	return 0;
-+}
-+
-+static void crypto_xz_decomp_exit(struct xz_comp_ctx *ctx)
-+{
-+	xz_dec_end(ctx->decomp_state);
-+}
-+
-+static int crypto_xz_init(struct crypto_tfm *tfm)
-+{
-+	struct xz_comp_ctx *ctx = crypto_tfm_ctx(tfm);
-+
-+	return crypto_xz_decomp_init(ctx);
-+}
-+
-+static void crypto_xz_exit(struct crypto_tfm *tfm)
-+{
-+	struct xz_comp_ctx *ctx = crypto_tfm_ctx(tfm);
-+
-+	crypto_xz_decomp_exit(ctx);
-+}
-+
-+static int crypto_xz_compress(struct crypto_tfm *tfm, const u8 *src,
-+			      unsigned int slen, u8 *dst, unsigned int *dlen)
-+{
-+	return -EOPNOTSUPP;
-+}
-+
-+static int crypto_xz_decompress(struct crypto_tfm *tfm, const u8 *src,
-+				unsigned int slen, u8 *dst, unsigned int *dlen)
-+{
-+	struct xz_comp_ctx *dctx = crypto_tfm_ctx(tfm);
-+	struct xz_buf *xz_buf = &dctx->decomp_buf;
-+	int ret;
-+
-+	memset(xz_buf, '\0', sizeof(struct xz_buf));
-+
-+	xz_buf->in = (u8 *) src;
-+	xz_buf->in_pos = 0;
-+	xz_buf->in_size = slen;
-+	xz_buf->out = (u8 *) dst;
-+	xz_buf->out_pos = 0;
-+	xz_buf->out_size = *dlen;
-+
-+	ret = xz_dec_run(dctx->decomp_state, xz_buf);
-+	if (ret != XZ_STREAM_END) {
-+		ret = -EINVAL;
-+		goto out;
-+	}
-+
-+	*dlen = xz_buf->out_pos;
-+	ret = 0;
-+
-+out:
-+	return ret;
-+}
-+
-+static struct crypto_alg crypto_xz_alg = {
-+	.cra_name		= "xz",
-+	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
-+	.cra_ctxsize		= sizeof(struct xz_comp_ctx),
-+	.cra_module		= THIS_MODULE,
-+	.cra_list		= LIST_HEAD_INIT(crypto_xz_alg.cra_list),
-+	.cra_init		= crypto_xz_init,
-+	.cra_exit		= crypto_xz_exit,
-+	.cra_u			= { .compress = {
-+	.coa_compress 		= crypto_xz_compress,
-+	.coa_decompress  	= crypto_xz_decompress } }
-+};
-+
-+static int __init crypto_xz_mod_init(void)
-+{
-+	return crypto_register_alg(&crypto_xz_alg);
-+}
-+
-+static void __exit crypto_xz_mod_exit(void)
-+{
-+	crypto_unregister_alg(&crypto_xz_alg);
-+}
-+
-+module_init(crypto_xz_mod_init);
-+module_exit(crypto_xz_mod_exit);
-+
-+MODULE_LICENSE("GPL v2");
-+MODULE_DESCRIPTION("Crypto XZ decompression support");
-+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
diff --git a/target/linux/generic/patches-4.1/541-ubifs-xz-decompression-support.patch b/target/linux/generic/patches-4.1/541-ubifs-xz-decompression-support.patch
deleted file mode 100644
index f85689c586..0000000000
--- a/target/linux/generic/patches-4.1/541-ubifs-xz-decompression-support.patch
+++ /dev/null
@@ -1,92 +0,0 @@
---- a/fs/ubifs/Kconfig
-+++ b/fs/ubifs/Kconfig
-@@ -5,8 +5,10 @@ config UBIFS_FS
- 	select CRYPTO if UBIFS_FS_ADVANCED_COMPR
- 	select CRYPTO if UBIFS_FS_LZO
- 	select CRYPTO if UBIFS_FS_ZLIB
-+	select CRYPTO if UBIFS_FS_XZ
- 	select CRYPTO_LZO if UBIFS_FS_LZO
- 	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
-+	select CRYPTO_XZ if UBIFS_FS_XZ
- 	depends on MTD_UBI
- 	help
- 	  UBIFS is a file system for flash devices which works on top of UBI.
-@@ -35,3 +37,12 @@ config UBIFS_FS_ZLIB
- 	default y
- 	help
- 	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
-+
-+config UBIFS_FS_XZ
-+	bool "XZ decompression support" if UBIFS_FS_ADVANCED_COMPR
-+	depends on UBIFS_FS
-+	default y
-+	help
-+	  XZ compresses better the ZLIB but it is slower..
-+	  Say 'Y' if unsure.
-+
---- a/fs/ubifs/compress.c
-+++ b/fs/ubifs/compress.c
-@@ -71,6 +71,24 @@ static struct ubifs_compressor zlib_comp
- };
- #endif
- 
-+#ifdef CONFIG_UBIFS_FS_XZ
-+static DEFINE_MUTEX(xz_enc_mutex);
-+static DEFINE_MUTEX(xz_dec_mutex);
-+
-+static struct ubifs_compressor xz_compr = {
-+	.compr_type = UBIFS_COMPR_XZ,
-+	.comp_mutex = &xz_enc_mutex,
-+	.decomp_mutex = &xz_dec_mutex,
-+	.name = "xz",
-+	.capi_name = "xz",
-+};
-+#else
-+static struct ubifs_compressor xz_compr = {
-+	.compr_type = UBIFS_COMPR_XZ,
-+	.name = "xz",
-+};
-+#endif
-+
- /* All UBIFS compressors */
- struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
- 
-@@ -232,9 +250,15 @@ int __init ubifs_compressors_init(void)
- 	if (err)
- 		goto out_lzo;
- 
-+	err = compr_init(&xz_compr);
-+	if (err)
-+		goto out_zlib;
-+
- 	ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
- 	return 0;
- 
-+out_zlib:
-+	compr_exit(&zlib_compr);
- out_lzo:
- 	compr_exit(&lzo_compr);
- 	return err;
-@@ -247,4 +271,5 @@ void ubifs_compressors_exit(void)
- {
- 	compr_exit(&lzo_compr);
- 	compr_exit(&zlib_compr);
-+	compr_exit(&xz_compr);
- }
---- a/fs/ubifs/ubifs-media.h
-+++ b/fs/ubifs/ubifs-media.h
-@@ -332,12 +332,14 @@ enum {
-  * UBIFS_COMPR_NONE: no compression
-  * UBIFS_COMPR_LZO: LZO compression
-  * UBIFS_COMPR_ZLIB: ZLIB compression
-+ * UBIFS_COMPR_XZ: XZ compression
-  * UBIFS_COMPR_TYPES_CNT: count of supported compression types
-  */
- enum {
- 	UBIFS_COMPR_NONE,
- 	UBIFS_COMPR_LZO,
- 	UBIFS_COMPR_ZLIB,
-+	UBIFS_COMPR_XZ,
- 	UBIFS_COMPR_TYPES_CNT,
- };
- 
diff --git a/target/linux/generic/patches-4.4/540-crypto-xz-decompression-support.patch b/target/linux/generic/patches-4.4/540-crypto-xz-decompression-support.patch
deleted file mode 100644
index 8a3377d41c..0000000000
--- a/target/linux/generic/patches-4.4/540-crypto-xz-decompression-support.patch
+++ /dev/null
@@ -1,146 +0,0 @@
---- a/crypto/Kconfig
-+++ b/crypto/Kconfig
-@@ -1544,6 +1544,13 @@ config CRYPTO_LZ4HC
- 	help
- 	  This is the LZ4 high compression mode algorithm.
- 
-+config CRYPTO_XZ
-+	tristate "XZ compression algorithm"
-+	select CRYPTO_ALGAPI
-+	select XZ_DEC
-+	help
-+	  This is the XZ algorithm. Only decompression is supported for now.
-+
- comment "Random Number Generation"
- 
- config CRYPTO_ANSI_CPRNG
---- a/crypto/Makefile
-+++ b/crypto/Makefile
-@@ -108,6 +108,7 @@ obj-$(CONFIG_CRYPTO_AUTHENC) += authenc.
- obj-$(CONFIG_CRYPTO_LZO) += lzo.o
- obj-$(CONFIG_CRYPTO_LZ4) += lz4.o
- obj-$(CONFIG_CRYPTO_LZ4HC) += lz4hc.o
-+obj-$(CONFIG_CRYPTO_XZ) += xz.o
- obj-$(CONFIG_CRYPTO_842) += 842.o
- obj-$(CONFIG_CRYPTO_RNG2) += rng.o
- obj-$(CONFIG_CRYPTO_ANSI_CPRNG) += ansi_cprng.o
---- /dev/null
-+++ b/crypto/xz.c
-@@ -0,0 +1,117 @@
-+/*
-+ * Cryptographic API.
-+ *
-+ * XZ decompression support.
-+ *
-+ * Copyright (c) 2012 Gabor Juhos <juhosg@openwrt.org>
-+ *
-+ * This program is free software; you can redistribute it and/or modify it
-+ * under the terms of the GNU General Public License version 2 as published by
-+ * the Free Software Foundation.
-+ *
-+ */
-+#include <linux/init.h>
-+#include <linux/module.h>
-+#include <linux/crypto.h>
-+#include <linux/xz.h>
-+#include <linux/interrupt.h>
-+#include <linux/mm.h>
-+#include <linux/net.h>
-+
-+struct xz_comp_ctx {
-+	struct xz_dec	*decomp_state;
-+	struct xz_buf	decomp_buf;
-+};
-+
-+static int crypto_xz_decomp_init(struct xz_comp_ctx *ctx)
-+{
-+	ctx->decomp_state = xz_dec_init(XZ_SINGLE, 0);
-+	if (!ctx->decomp_state)
-+		return -ENOMEM;
-+
-+	return 0;
-+}
-+
-+static void crypto_xz_decomp_exit(struct xz_comp_ctx *ctx)
-+{
-+	xz_dec_end(ctx->decomp_state);
-+}
-+
-+static int crypto_xz_init(struct crypto_tfm *tfm)
-+{
-+	struct xz_comp_ctx *ctx = crypto_tfm_ctx(tfm);
-+
-+	return crypto_xz_decomp_init(ctx);
-+}
-+
-+static void crypto_xz_exit(struct crypto_tfm *tfm)
-+{
-+	struct xz_comp_ctx *ctx = crypto_tfm_ctx(tfm);
-+
-+	crypto_xz_decomp_exit(ctx);
-+}
-+
-+static int crypto_xz_compress(struct crypto_tfm *tfm, const u8 *src,
-+			      unsigned int slen, u8 *dst, unsigned int *dlen)
-+{
-+	return -EOPNOTSUPP;
-+}
-+
-+static int crypto_xz_decompress(struct crypto_tfm *tfm, const u8 *src,
-+				unsigned int slen, u8 *dst, unsigned int *dlen)
-+{
-+	struct xz_comp_ctx *dctx = crypto_tfm_ctx(tfm);
-+	struct xz_buf *xz_buf = &dctx->decomp_buf;
-+	int ret;
-+
-+	memset(xz_buf, '\0', sizeof(struct xz_buf));
-+
-+	xz_buf->in = (u8 *) src;
-+	xz_buf->in_pos = 0;
-+	xz_buf->in_size = slen;
-+	xz_buf->out = (u8 *) dst;
-+	xz_buf->out_pos = 0;
-+	xz_buf->out_size = *dlen;
-+
-+	ret = xz_dec_run(dctx->decomp_state, xz_buf);
-+	if (ret != XZ_STREAM_END) {
-+		ret = -EINVAL;
-+		goto out;
-+	}
-+
-+	*dlen = xz_buf->out_pos;
-+	ret = 0;
-+
-+out:
-+	return ret;
-+}
-+
-+static struct crypto_alg crypto_xz_alg = {
-+	.cra_name		= "xz",
-+	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
-+	.cra_ctxsize		= sizeof(struct xz_comp_ctx),
-+	.cra_module		= THIS_MODULE,
-+	.cra_list		= LIST_HEAD_INIT(crypto_xz_alg.cra_list),
-+	.cra_init		= crypto_xz_init,
-+	.cra_exit		= crypto_xz_exit,
-+	.cra_u			= { .compress = {
-+	.coa_compress 		= crypto_xz_compress,
-+	.coa_decompress  	= crypto_xz_decompress } }
-+};
-+
-+static int __init crypto_xz_mod_init(void)
-+{
-+	return crypto_register_alg(&crypto_xz_alg);
-+}
-+
-+static void __exit crypto_xz_mod_exit(void)
-+{
-+	crypto_unregister_alg(&crypto_xz_alg);
-+}
-+
-+module_init(crypto_xz_mod_init);
-+module_exit(crypto_xz_mod_exit);
-+
-+MODULE_LICENSE("GPL v2");
-+MODULE_DESCRIPTION("Crypto XZ decompression support");
-+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
diff --git a/target/linux/generic/patches-4.4/541-ubifs-xz-decompression-support.patch b/target/linux/generic/patches-4.4/541-ubifs-xz-decompression-support.patch
deleted file mode 100644
index 277d91507b..0000000000
--- a/target/linux/generic/patches-4.4/541-ubifs-xz-decompression-support.patch
+++ /dev/null
@@ -1,94 +0,0 @@
---- a/fs/ubifs/Kconfig
-+++ b/fs/ubifs/Kconfig
-@@ -5,8 +5,10 @@ config UBIFS_FS
- 	select CRYPTO if UBIFS_FS_ADVANCED_COMPR
- 	select CRYPTO if UBIFS_FS_LZO
- 	select CRYPTO if UBIFS_FS_ZLIB
-+	select CRYPTO if UBIFS_FS_XZ
- 	select CRYPTO_LZO if UBIFS_FS_LZO
- 	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
-+	select CRYPTO_XZ if UBIFS_FS_XZ
- 	depends on MTD_UBI
- 	help
- 	  UBIFS is a file system for flash devices which works on top of UBI.
-@@ -36,6 +38,14 @@ config UBIFS_FS_ZLIB
- 	help
- 	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
- 
-+config UBIFS_FS_XZ
-+	bool "XZ decompression support" if UBIFS_FS_ADVANCED_COMPR
-+	depends on UBIFS_FS
-+	default y
-+	help
-+	  XZ compresses better the ZLIB but it is slower..
-+	  Say 'Y' if unsure.
-+
- config UBIFS_ATIME_SUPPORT
- 	bool "Access time support" if UBIFS_FS
- 	depends on UBIFS_FS
---- a/fs/ubifs/compress.c
-+++ b/fs/ubifs/compress.c
-@@ -71,6 +71,24 @@ static struct ubifs_compressor zlib_comp
- };
- #endif
- 
-+#ifdef CONFIG_UBIFS_FS_XZ
-+static DEFINE_MUTEX(xz_enc_mutex);
-+static DEFINE_MUTEX(xz_dec_mutex);
-+
-+static struct ubifs_compressor xz_compr = {
-+	.compr_type = UBIFS_COMPR_XZ,
-+	.comp_mutex = &xz_enc_mutex,
-+	.decomp_mutex = &xz_dec_mutex,
-+	.name = "xz",
-+	.capi_name = "xz",
-+};
-+#else
-+static struct ubifs_compressor xz_compr = {
-+	.compr_type = UBIFS_COMPR_XZ,
-+	.name = "xz",
-+};
-+#endif
-+
- /* All UBIFS compressors */
- struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
- 
-@@ -232,9 +250,15 @@ int __init ubifs_compressors_init(void)
- 	if (err)
- 		goto out_lzo;
- 
-+	err = compr_init(&xz_compr);
-+	if (err)
-+		goto out_zlib;
-+
- 	ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
- 	return 0;
- 
-+out_zlib:
-+	compr_exit(&zlib_compr);
- out_lzo:
- 	compr_exit(&lzo_compr);
- 	return err;
-@@ -247,4 +271,5 @@ void ubifs_compressors_exit(void)
- {
- 	compr_exit(&lzo_compr);
- 	compr_exit(&zlib_compr);
-+	compr_exit(&xz_compr);
- }
---- a/fs/ubifs/ubifs-media.h
-+++ b/fs/ubifs/ubifs-media.h
-@@ -332,12 +332,14 @@ enum {
-  * UBIFS_COMPR_NONE: no compression
-  * UBIFS_COMPR_LZO: LZO compression
-  * UBIFS_COMPR_ZLIB: ZLIB compression
-+ * UBIFS_COMPR_XZ: XZ compression
-  * UBIFS_COMPR_TYPES_CNT: count of supported compression types
-  */
- enum {
- 	UBIFS_COMPR_NONE,
- 	UBIFS_COMPR_LZO,
- 	UBIFS_COMPR_ZLIB,
-+	UBIFS_COMPR_XZ,
- 	UBIFS_COMPR_TYPES_CNT,
- };
-