On Mon, Jun 15, 2020 at 10:14:48AM +0300, Tero Kristo wrote: > > +static int sa_sha_update(struct ahash_request *req) > +{ > + struct sa_sha_req_ctx *rctx = ahash_request_ctx(req); > + struct scatterlist *sg; > + void *buf; > + int pages; > + struct page *pg; > + > + if (!req->nbytes) > + return 0; > + > + if (rctx->buf_free >= req->nbytes) { > + pg = sg_page(rctx->sg_next); > + buf = kmap_atomic(pg); > + scatterwalk_map_and_copy(buf + rctx->offset, req->src, 0, > + req->nbytes, 0); > + kunmap_atomic(buf); > + rctx->buf_free -= req->nbytes; > + rctx->sg_next->length += req->nbytes; > + rctx->offset += req->nbytes; > + } else { > + pages = get_order(req->nbytes); > + buf = (void *)__get_free_pages(GFP_ATOMIC, pages); > + if (!buf) > + return -ENOMEM; > + > + sg = kzalloc(sizeof(*sg) * 2, GFP_KERNEL); > + if (!sg) > + return -ENOMEM; > + > + sg_init_table(sg, 1); > + sg_set_buf(sg, buf, req->nbytes); > + scatterwalk_map_and_copy(buf, req->src, 0, req->nbytes, 0); > + > + rctx->buf_free = (PAGE_SIZE << pages) - req->nbytes; > + > + if (rctx->sg_next) { > + sg_unmark_end(rctx->sg_next); > + sg_chain(rctx->sg_next, 2, sg); > + } else { > + rctx->src = sg; > + } > + > + rctx->sg_next = sg; > + rctx->src_nents++; > + > + rctx->offset = req->nbytes; > + } > + > + rctx->len += req->nbytes; > + > + return 0; > +} This is not how it's supposed to work. To support the partial hashing interface, you must actually hash the data and not just save it in your context. Otherwise your export is completely meaningless. If your hardware cannot export partially hashed state, then you should use a software fallback for everything but digest. Cheers, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt