From e8dd273d199f5bbe295a8e3d8b777c5505b6b2e1 Mon Sep 17 00:00:00 2001 From: Salah Triki Date: Thu, 17 Sep 2026 14:00:52 +0100 Subject: iio: proximity: isl29501: Fix return type of isl29501_register_write isl29501_register_write() was returning a u32 instead of an int. Since the function returns negative error codes (such as -ERANGE or return values from i2c_smbus_write_byte_data()), returning an unsigned integer type prevents callers from correctly checking for negative error conditions. Fix this by changing the function return type from u32 to int. This was found through manual code review. Fixes: 1c28799257bc ("iio: light: isl29501: Add support for the ISL29501 ToF sensor.") Signed-off-by: Salah Triki Reviewed-by: Joshua Crofts Cc: stable@vger.kernel.org Signed-off-by: Jonathan Cameron --- crypto/zstd.c | 315 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 315 insertions(+) create mode 100644 crypto/zstd.c (limited to 'crypto/zstd.c') diff --git a/crypto/zstd.c b/crypto/zstd.c new file mode 100644 index 000000000..556f5d2bd --- /dev/null +++ b/crypto/zstd.c @@ -0,0 +1,315 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Cryptographic API. + * + * Copyright (c) 2017-present, Facebook, Inc. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#define ZSTD_DEF_LEVEL 3 +#define ZSTD_MAX_WINDOWLOG 18 +#define ZSTD_MAX_SIZE BIT(ZSTD_MAX_WINDOWLOG) + +struct zstd_ctx { + zstd_cctx *cctx; + zstd_dctx *dctx; + size_t wksp_size; + zstd_parameters params; + u8 wksp[] __aligned(8) __counted_by(wksp_size); +}; + +static DEFINE_MUTEX(zstd_stream_lock); + +static void *zstd_alloc_stream(void) +{ + zstd_parameters params; + struct zstd_ctx *ctx; + size_t wksp_size; + + params = zstd_get_params(ZSTD_DEF_LEVEL, ZSTD_MAX_SIZE); + + wksp_size = max(zstd_cstream_workspace_bound(¶ms.cParams), + zstd_dstream_workspace_bound(ZSTD_MAX_SIZE)); + if (!wksp_size) + return ERR_PTR(-EINVAL); + + ctx = kvmalloc_flex(*ctx, wksp, wksp_size); + if (!ctx) + return ERR_PTR(-ENOMEM); + + ctx->params = params; + ctx->wksp_size = wksp_size; + + return ctx; +} + +static void zstd_free_stream(void *ctx) +{ + kvfree(ctx); +} + +static struct crypto_acomp_streams zstd_streams = { + .alloc_ctx = zstd_alloc_stream, + .free_ctx = zstd_free_stream, +}; + +static int zstd_init(struct crypto_acomp *acomp_tfm) +{ + int ret = 0; + + mutex_lock(&zstd_stream_lock); + ret = crypto_acomp_alloc_streams(&zstd_streams); + mutex_unlock(&zstd_stream_lock); + + return ret; +} + +static int zstd_compress_one(struct acomp_req *req, struct zstd_ctx *ctx, + const void *src, void *dst, unsigned int *dlen) +{ + size_t out_len; + + ctx->cctx = zstd_init_cctx(ctx->wksp, ctx->wksp_size); + if (!ctx->cctx) + return -EINVAL; + + out_len = zstd_compress_cctx(ctx->cctx, dst, req->dlen, src, req->slen, + &ctx->params); + if (zstd_is_error(out_len)) + return -EINVAL; + + *dlen = out_len; + + return 0; +} + +static int zstd_compress(struct acomp_req *req) +{ + struct crypto_acomp_stream *s; + unsigned int pos, scur, dcur; + unsigned int total_out = 0; + bool data_available = true; + zstd_out_buffer outbuf; + struct acomp_walk walk; + zstd_in_buffer inbuf; + struct zstd_ctx *ctx; + size_t pending_bytes; + size_t num_bytes; + int ret; + + s = crypto_acomp_lock_stream_bh(&zstd_streams); + ctx = s->ctx; + + ret = acomp_walk_virt(&walk, req, true); + if (ret) + goto out; + + ctx->cctx = zstd_init_cstream(&ctx->params, 0, ctx->wksp, ctx->wksp_size); + if (!ctx->cctx) { + ret = -EINVAL; + goto out; + } + + do { + dcur = acomp_walk_next_dst(&walk); + if (!dcur) { + ret = -ENOSPC; + goto out; + } + + outbuf.pos = 0; + outbuf.dst = (u8 *)walk.dst.virt.addr; + outbuf.size = dcur; + + do { + scur = acomp_walk_next_src(&walk); + if (dcur == req->dlen && scur == req->slen) { + ret = zstd_compress_one(req, ctx, walk.src.virt.addr, + walk.dst.virt.addr, &total_out); + acomp_walk_done_src(&walk, scur); + acomp_walk_done_dst(&walk, dcur); + goto out; + } + + if (scur) { + inbuf.pos = 0; + inbuf.src = walk.src.virt.addr; + inbuf.size = scur; + } else { + data_available = false; + break; + } + + num_bytes = zstd_compress_stream(ctx->cctx, &outbuf, &inbuf); + if (ZSTD_isError(num_bytes)) { + ret = -EIO; + goto out; + } + + pending_bytes = zstd_flush_stream(ctx->cctx, &outbuf); + if (ZSTD_isError(pending_bytes)) { + ret = -EIO; + goto out; + } + acomp_walk_done_src(&walk, inbuf.pos); + } while (dcur != outbuf.pos); + + total_out += outbuf.pos; + acomp_walk_done_dst(&walk, dcur); + } while (data_available); + + pos = outbuf.pos; + num_bytes = zstd_end_stream(ctx->cctx, &outbuf); + if (ZSTD_isError(num_bytes)) + ret = -EIO; + else + total_out += (outbuf.pos - pos); + +out: + if (ret) + req->dlen = 0; + else + req->dlen = total_out; + + crypto_acomp_unlock_stream_bh(s); + + return ret; +} + +static int zstd_decompress_one(struct acomp_req *req, struct zstd_ctx *ctx, + const void *src, void *dst, unsigned int *dlen) +{ + size_t out_len; + + ctx->dctx = zstd_init_dctx(ctx->wksp, ctx->wksp_size); + if (!ctx->dctx) + return -EINVAL; + + out_len = zstd_decompress_dctx(ctx->dctx, dst, req->dlen, src, req->slen); + if (zstd_is_error(out_len)) + return -EINVAL; + + *dlen = out_len; + + return 0; +} + +static int zstd_decompress(struct acomp_req *req) +{ + struct crypto_acomp_stream *s; + unsigned int total_out = 0; + unsigned int scur, dcur; + zstd_out_buffer outbuf; + struct acomp_walk walk; + zstd_in_buffer inbuf; + struct zstd_ctx *ctx; + size_t pending_bytes; + int ret; + + s = crypto_acomp_lock_stream_bh(&zstd_streams); + ctx = s->ctx; + + ret = acomp_walk_virt(&walk, req, true); + if (ret) + goto out; + + ctx->dctx = zstd_init_dstream(ZSTD_MAX_SIZE, ctx->wksp, ctx->wksp_size); + if (!ctx->dctx) { + ret = -EINVAL; + goto out; + } + + do { + scur = acomp_walk_next_src(&walk); + if (scur) { + inbuf.pos = 0; + inbuf.size = scur; + inbuf.src = walk.src.virt.addr; + } else { + break; + } + + do { + dcur = acomp_walk_next_dst(&walk); + if (dcur == req->dlen && scur == req->slen) { + ret = zstd_decompress_one(req, ctx, walk.src.virt.addr, + walk.dst.virt.addr, &total_out); + acomp_walk_done_dst(&walk, dcur); + acomp_walk_done_src(&walk, scur); + goto out; + } + + if (!dcur) { + ret = -ENOSPC; + goto out; + } + + outbuf.pos = 0; + outbuf.dst = (u8 *)walk.dst.virt.addr; + outbuf.size = dcur; + + pending_bytes = zstd_decompress_stream(ctx->dctx, &outbuf, &inbuf); + if (ZSTD_isError(pending_bytes)) { + ret = -EIO; + goto out; + } + + total_out += outbuf.pos; + + acomp_walk_done_dst(&walk, outbuf.pos); + } while (inbuf.pos != scur); + + acomp_walk_done_src(&walk, scur); + } while (ret == 0); + +out: + if (ret) + req->dlen = 0; + else + req->dlen = total_out; + + crypto_acomp_unlock_stream_bh(s); + + return ret; +} + +static struct acomp_alg zstd_acomp = { + .base = { + .cra_name = "zstd", + .cra_driver_name = "zstd-generic", + .cra_flags = CRYPTO_ALG_REQ_VIRT, + .cra_module = THIS_MODULE, + }, + .init = zstd_init, + .compress = zstd_compress, + .decompress = zstd_decompress, +}; + +static int __init zstd_mod_init(void) +{ + return crypto_register_acomp(&zstd_acomp); +} + +static void __exit zstd_mod_fini(void) +{ + crypto_unregister_acomp(&zstd_acomp); + crypto_acomp_free_streams(&zstd_streams); +} + +module_init(zstd_mod_init); +module_exit(zstd_mod_fini); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Zstd Compression Algorithm"); +MODULE_ALIAS_CRYPTO("zstd"); -- cgit v1.3.1