From: Ard Biesheuvel Date: Mon, 24 Jul 2017 10:28:14 +0000 (+0100) Subject: crypto: arm64/chacha20 - take may_use_simd() into account X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=611d5324f488b82ef224ab493f1ed5fb2af6f003;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git crypto: arm64/chacha20 - take may_use_simd() into account To accommodate systems that disallow the use of kernel mode NEON in some circumstances, take the return value of may_use_simd into account when deciding whether to invoke the C fallback routine. Signed-off-by: Ard Biesheuvel Signed-off-by: Herbert Xu --- diff --git a/arch/arm64/crypto/chacha20-neon-glue.c b/arch/arm64/crypto/chacha20-neon-glue.c index a7cd575ea223..cbdb75d15cd0 100644 --- a/arch/arm64/crypto/chacha20-neon-glue.c +++ b/arch/arm64/crypto/chacha20-neon-glue.c @@ -1,7 +1,7 @@ /* * ChaCha20 256-bit cipher algorithm, RFC7539, arm64 NEON functions * - * Copyright (C) 2016 Linaro, Ltd. + * Copyright (C) 2016 - 2017 Linaro, Ltd. * * 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 @@ -26,6 +26,7 @@ #include #include +#include asmlinkage void chacha20_block_xor_neon(u32 *state, u8 *dst, const u8 *src); asmlinkage void chacha20_4block_xor_neon(u32 *state, u8 *dst, const u8 *src); @@ -64,7 +65,7 @@ static int chacha20_neon(struct skcipher_request *req) u32 state[16]; int err; - if (req->cryptlen <= CHACHA20_BLOCK_SIZE) + if (!may_use_simd() || req->cryptlen <= CHACHA20_BLOCK_SIZE) return crypto_chacha20_crypt(req); err = skcipher_walk_virt(&walk, req, true);