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crypto: aesni - clean up mapping of associated data 

The gcm(aes-ni) driver is only built for x86_64, which does not make
use of highmem. So testing for PageHighMem is pointless and can be
omitted.

While at it, replace GFP_ATOMIC with the appropriate runtime decided
value based on the context.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2021-01-04 16:55:48 +01:00 committed by Herbert Xu
parent 30f2c18eb5
commit 2694e23ffd
1 changed files with 5 additions and 4 deletions
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9
arch/x86/crypto/aesni-intel_glue.c
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@ -667,14 +667,15 @@ static int gcmaes_crypt_by_sg(bool enc, struct aead_request *req,
gcm_tfm = &aesni_gcm_tfm_sse;
/* Linearize assoc, if not already linear */
if (req->src->length >= assoclen && req->src->length &&
(!PageHighMem(sg_page(req->src)) ||
req->src->offset + req->src->length <= PAGE_SIZE)) {
if (req->src->length >= assoclen && req->src->length) {
scatterwalk_start(&assoc_sg_walk, req->src);
assoc = scatterwalk_map(&assoc_sg_walk);
} else {
gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
GFP_KERNEL : GFP_ATOMIC;
/* assoc can be any length, so must be on heap */
assocmem = kmalloc(assoclen, GFP_ATOMIC);
assocmem = kmalloc(assoclen, flags);
if (unlikely(!assocmem))
return -ENOMEM;
assoc = assocmem;