crypto: s5p-sss - use the new scatterwalk functions

s5p_sg_copy_buf() open-coded a copy from/to a scatterlist using
scatterwalk_* functions that are planned for removal.  Replace it with
the new functions memcpy_from_sglist() and memcpy_to_sglist() instead.
Also take the opportunity to replace calls to scatterwalk_map_and_copy()
in the same file; this eliminates the confusing 'out' argument.

Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Cc: linux-samsung-soc@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: ebiggers

drivers/crypto/s5p-sss.c

@@ -458,19 +458,6 @@ static void s5p_free_sg_cpy(struct s5p_aes_dev *dev, struct scatterlist **sg)
 	*sg = NULL;
 }
 
-static void s5p_sg_copy_buf(void *buf, struct scatterlist *sg,
-			    unsigned int nbytes, int out)
-{
-	struct scatter_walk walk;
-
-	if (!nbytes)
-		return;
-
-	scatterwalk_start(&walk, sg);
-	scatterwalk_copychunks(buf, &walk, nbytes, out);
-	scatterwalk_done(&walk, out, 0);
-}
-
 static void s5p_sg_done(struct s5p_aes_dev *dev)
 {
 	struct skcipher_request *req = dev->req;
@@ -480,8 +467,8 @@ static void s5p_sg_done(struct s5p_aes_dev *dev)
 		dev_dbg(dev->dev,
 			"Copying %d bytes of output data back to original place\n",
 			dev->req->cryptlen);
-		s5p_sg_copy_buf(sg_virt(dev->sg_dst_cpy), dev->req->dst,
-				dev->req->cryptlen, 1);
+		memcpy_to_sglist(dev->req->dst, 0, sg_virt(dev->sg_dst_cpy),
+				 dev->req->cryptlen);
 	}
 	s5p_free_sg_cpy(dev, &dev->sg_src_cpy);
 	s5p_free_sg_cpy(dev, &dev->sg_dst_cpy);
@@ -526,7 +513,7 @@ static int s5p_make_sg_cpy(struct s5p_aes_dev *dev, struct scatterlist *src,
 		return -ENOMEM;
 	}
 
-	s5p_sg_copy_buf(pages, src, dev->req->cryptlen, 0);
+	memcpy_from_sglist(pages, src, 0, dev->req->cryptlen);
 
 	sg_init_table(*dst, 1);
 	sg_set_buf(*dst, pages, len);
@@ -1035,8 +1022,7 @@ static int s5p_hash_copy_sgs(struct s5p_hash_reqctx *ctx,
 	if (ctx->bufcnt)
 		memcpy(buf, ctx->dd->xmit_buf, ctx->bufcnt);
 
-	scatterwalk_map_and_copy(buf + ctx->bufcnt, sg, ctx->skip,
-				 new_len, 0);
+	memcpy_from_sglist(buf + ctx->bufcnt, sg, ctx->skip, new_len);
 	sg_init_table(ctx->sgl, 1);
 	sg_set_buf(ctx->sgl, buf, len);
 	ctx->sg = ctx->sgl;
@@ -1229,8 +1215,7 @@ static int s5p_hash_prepare_request(struct ahash_request *req, bool update)
 		if (len > nbytes)
 			len = nbytes;
 
-		scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, req->src,
-					 0, len, 0);
+		memcpy_from_sglist(ctx->buffer + ctx->bufcnt, req->src, 0, len);
 		ctx->bufcnt += len;
 		nbytes -= len;
 		ctx->skip = len;
@@ -1253,9 +1238,8 @@ static int s5p_hash_prepare_request(struct ahash_request *req, bool update)
 		hash_later = ctx->total - xmit_len;
 		/* copy hash_later bytes from end of req->src */
 		/* previous bytes are in xmit_buf, so no overwrite */
-		scatterwalk_map_and_copy(ctx->buffer, req->src,
-					 req->nbytes - hash_later,
-					 hash_later, 0);
+		memcpy_from_sglist(ctx->buffer, req->src,
+				   req->nbytes - hash_later, hash_later);
 	}
 
 	if (xmit_len > BUFLEN) {
@@ -1267,8 +1251,8 @@ static int s5p_hash_prepare_request(struct ahash_request *req, bool update)
 		/* have buffered data only */
 		if (unlikely(!ctx->bufcnt)) {
 			/* first update didn't fill up buffer */
-			scatterwalk_map_and_copy(ctx->dd->xmit_buf, req->src,
-						 0, xmit_len, 0);
+			memcpy_from_sglist(ctx->dd->xmit_buf, req->src,
+					   0, xmit_len);
 		}
 
 		sg_init_table(ctx->sgl, 1);
@@ -1506,8 +1490,8 @@ static int s5p_hash_update(struct ahash_request *req)
 		return 0;
 
 	if (ctx->bufcnt + req->nbytes <= BUFLEN) {
-		scatterwalk_map_and_copy(ctx->buffer + ctx->bufcnt, req->src,
-					 0, req->nbytes, 0);
+		memcpy_from_sglist(ctx->buffer + ctx->bufcnt, req->src,
+				   0, req->nbytes);
 		ctx->bufcnt += req->nbytes;
 		return 0;
 	}