Re: [PATCH v7 3/3] crypto: Add Inside Secure SafeXcel EIP-93 crypto engine support

[Herbert Xu]

On Tue, Nov 12, 2024 at 02:59:00AM +0100, Christian Marangi wrote:
>
> +static int eip93_hash_export(struct ahash_request *req, void *out)
> +{
> +	struct eip93_hash_reqctx *rctx = ahash_request_ctx(req);
> +	struct eip93_hash_export_state *state = out;
> +	DECLARE_CRYPTO_WAIT(wait);
> +	int ret;
> +
> +	crypto_init_wait(&wait);
> +	/* Set the req callback for hash_partial_final wait */
> +	ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
> +				   crypto_req_done, &wait);
> +
> +	/* Set for partial hash generation */
> +	rctx->partial_hash = true;
> +	rctx->export_state = true;
> +	rctx->state = state;
> +
> +	/* Save the first block in state data */
> +	if (rctx->left_last || rctx->len) {
> +		struct mkt_hash_block *block;
> +
> +		block = list_first_entry(&rctx->blocks,
> +					 struct mkt_hash_block,
> +					 list);
> +
> +		memcpy(state->data, block->data,
> +		       SHA256_BLOCK_SIZE - rctx->left_last);
> +	}
> +
> +	/* Call hash_partial_final.
> +	 * This will send a dummpy 0 length packet. This is done to
> +	 * wait for every descriptor to being handled and sync the sa_state
> +	 * from the host. Partial hash and any other data will be copied in
> +	 * eip93_hash_handle_result()
> +	 */
> +	ret = crypto_wait_req(eip93_hash_partial_final(req), &wait);

Sorry, you can't do that here.  Your hash state should have been
exported when the request previously completed.  The export function
must not sleep.

Cheers,
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt