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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2017-07-24 11:28:14 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-08-04 09:27:22 +0800 |
| commit | 611d5324f488b82ef224ab493f1ed5fb2af6f003 (patch) | |
| tree | ad249afec60f0407b096c6278367c3aca3426ab8 /arch | |
| parent | e211506979e205e5a00b0a9d321fb3cbb44ee9ea (diff) | |
| download | linux-611d5324f488b82ef224ab493f1ed5fb2af6f003.tar.gz linux-611d5324f488b82ef224ab493f1ed5fb2af6f003.tar.bz2 linux-611d5324f488b82ef224ab493f1ed5fb2af6f003.zip | |
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 <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/crypto/chacha20-neon-glue.c | 5 |
1 files changed, 3 insertions, 2 deletions
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. <ard.biesheuvel@linaro.org> + * Copyright (C) 2016 - 2017 Linaro, Ltd. <ard.biesheuvel@linaro.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 @@ -26,6 +26,7 @@ #include <asm/hwcap.h> #include <asm/neon.h> +#include <asm/simd.h> 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); |