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crypto/arm64: sm4-ce-ccm - Avoid pointless yield of the NEON unit

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Kernel mode NEON sections are now preemptible on arm64, and so there is
no need to yield it when calling APIs that may sleep.

Also, move the calls to kernel_neon_end() to the same scope as
kernel_neon_begin(). This is needed for a subsequent change where a
stack buffer is allocated transparently and passed to
kernel_neon_begin().

Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2025-09-17 23:30:18 +02:00
parent e9426f3e6b
commit 9520ef3771
1 changed files with 6 additions and 19 deletions
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25
arch/arm64/crypto/sm4-ce-ccm-glue.c
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@ -172,35 +172,22 @@ static int ccm_crypt(struct aead_request *req, struct skcipher_walk *walk,
if (req->assoclen)
ccm_calculate_auth_mac(req, mac);
while (walk->nbytes && walk->nbytes != walk->total) {
while (walk->nbytes) {
unsigned int tail = walk->nbytes % SM4_BLOCK_SIZE;
if (walk->nbytes == walk->total)
tail = 0;
sm4_ce_ccm_crypt(rkey_enc, walk->dst.virt.addr,
walk->src.virt.addr, walk->iv,
walk->nbytes - tail, mac);
kernel_neon_end();
err = skcipher_walk_done(walk, tail);
kernel_neon_begin();
}
if (walk->nbytes) {
sm4_ce_ccm_crypt(rkey_enc, walk->dst.virt.addr,
walk->src.virt.addr, walk->iv,
walk->nbytes, mac);
sm4_ce_ccm_final(rkey_enc, ctr0, mac);
sm4_ce_ccm_final(rkey_enc, ctr0, mac);
kernel_neon_end();
err = skcipher_walk_done(walk, 0);
} else {
sm4_ce_ccm_final(rkey_enc, ctr0, mac);
kernel_neon_end();
}
kernel_neon_end();
return err;
}