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crypto: aspeed/hash - Add fallback

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If a hash request fails due to a DMA mapping error, or if it is too
large to fit in the the driver buffer, use a fallback to do the hash
rather than failing.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu
2025-05-13 14:04:06 +08:00
parent 5f38ebefc3
commit 5087122286
1 changed files with 27 additions and 1 deletions
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28
drivers/crypto/aspeed/aspeed-hace-hash.c
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@@ -420,6 +420,32 @@ static int aspeed_hace_hash_handle_queue(struct aspeed_hace_dev *hace_dev,
hace_dev->crypt_engine_hash, req);
}
static noinline int aspeed_ahash_fallback(struct ahash_request *req)
{
struct aspeed_sham_reqctx *rctx = ahash_request_ctx(req);
HASH_FBREQ_ON_STACK(fbreq, req);
u8 *state = rctx->buffer;
struct scatterlist sg[2];
struct scatterlist *ssg;
int ret;
ssg = scatterwalk_ffwd(sg, req->src, rctx->offset);
ahash_request_set_crypt(fbreq, ssg, req->result,
rctx->total - rctx->offset);
ret = aspeed_sham_export(req, state) ?:
crypto_ahash_import_core(fbreq, state);
if (rctx->flags & SHA_FLAGS_FINUP)
ret = ret ?: crypto_ahash_finup(fbreq);
else
ret = ret ?: crypto_ahash_update(fbreq);
crypto_ahash_export_core(fbreq, state) ?:
aspeed_sham_import(req, state);
HASH_REQUEST_ZERO(fbreq);
return ret;
}
static int aspeed_ahash_do_request(struct crypto_engine *engine, void *areq)
{
struct ahash_request *req = ahash_request_cast(areq);
@@ -434,7 +460,7 @@ static int aspeed_ahash_do_request(struct crypto_engine *engine, void *areq)
ret = aspeed_ahash_req_update(hace_dev);
if (ret != -EINPROGRESS)
return ret;
return aspeed_ahash_fallback(req);
return 0;
}