v4.19.13 snapshot.
diff --git a/crypto/lz4.c b/crypto/lz4.c
new file mode 100644
index 0000000..2ce2660
--- /dev/null
+++ b/crypto/lz4.c
@@ -0,0 +1,173 @@
+/*
+ * Cryptographic API.
+ *
+ * Copyright (c) 2013 Chanho Min <chanho.min@lge.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/crypto.h>
+#include <linux/vmalloc.h>
+#include <linux/lz4.h>
+#include <crypto/internal/scompress.h>
+
+struct lz4_ctx {
+ void *lz4_comp_mem;
+};
+
+static void *lz4_alloc_ctx(struct crypto_scomp *tfm)
+{
+ void *ctx;
+
+ ctx = vmalloc(LZ4_MEM_COMPRESS);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+
+ 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)
+{
+ int out_len = LZ4_compress_default(src, dst,
+ slen, *dlen, ctx);
+
+ if (!out_len)
+ return -EINVAL;
+
+ *dlen = out_len;
+ return 0;
+}
+
+static int lz4_scompress(struct crypto_scomp *tfm, const u8 *src,
+ unsigned int slen, u8 *dst, unsigned int *dlen,
+ void *ctx)
+{
+ 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)
+{
+ int out_len = LZ4_decompress_safe(src, dst, slen, *dlen);
+
+ if (out_len < 0)
+ return -EINVAL;
+
+ *dlen = out_len;
+ return 0;
+}
+
+static int lz4_sdecompress(struct crypto_scomp *tfm, const u8 *src,
+ unsigned int slen, u8 *dst, unsigned int *dlen,
+ void *ctx)
+{
+ 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_flags = CRYPTO_ALG_TYPE_COMPRESS,
+ .cra_ctxsize = sizeof(struct lz4_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(alg_lz4.cra_list),
+ .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,
+ .compress = lz4_scompress,
+ .decompress = lz4_sdecompress,
+ .base = {
+ .cra_name = "lz4",
+ .cra_driver_name = "lz4-scomp",
+ .cra_module = THIS_MODULE,
+ }
+};
+
+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;
+}
+
+static void __exit lz4_mod_fini(void)
+{
+ crypto_unregister_alg(&alg_lz4);
+ crypto_unregister_scomp(&scomp);
+}
+
+module_init(lz4_mod_init);
+module_exit(lz4_mod_fini);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("LZ4 Compression Algorithm");
+MODULE_ALIAS_CRYPTO("lz4");