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crypto: arm/ghash - use the new scatterwalk functions

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Use scatterwalk_next() which consolidates scatterwalk_clamp() and
scatterwalk_map(), and use scatterwalk_done_src() which consolidates
scatterwalk_unmap(), scatterwalk_advance(), and scatterwalk_done().
Remove unnecessary code that seemed to be intended to advance to the
next sg entry, which is already handled by the scatterwalk functions.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2025-02-19 10:23:30 -08:00 committed by Herbert Xu
parent c89edd931a
commit 5dc14e0bce
1 changed files with 4 additions and 11 deletions
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15
arch/arm/crypto/ghash-ce-glue.c
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@ -459,17 +459,12 @@ static void gcm_calculate_auth_mac(struct aead_request *req, u64 dg[], u32 len)
scatterwalk_start(&walk, req->src);
do {
u32 n = scatterwalk_clamp(&walk, len);
u8 *p;
unsigned int n;
const u8 *p;
if (!n) {
scatterwalk_start(&walk, sg_next(walk.sg));
n = scatterwalk_clamp(&walk, len);
}
p = scatterwalk_map(&walk);
p = scatterwalk_next(&walk, len, &n);
gcm_update_mac(dg, p, n, buf, &buf_count, ctx);
scatterwalk_unmap(p);
scatterwalk_done_src(&walk, p, n);
if (unlikely(len / SZ_4K > (len - n) / SZ_4K)) {
kernel_neon_end();
@ -477,8 +472,6 @@ static void gcm_calculate_auth_mac(struct aead_request *req, u64 dg[], u32 len)
}
len -= n;
scatterwalk_advance(&walk, n);
scatterwalk_done(&walk, 0, len);
} while (len);
if (buf_count) {