crypto: marvell/cesa - factor out adding an operation and launching it

Add a helper to add the fragment operation block followed by the DMA
entry to launch the operation.

Although at the moment this pattern only strictly appears at one site,
two other sites can be factored as well by slightly changing the order
in which the DMA operations are performed.  This should be harmless as
the only thing which matters is to have all the data loaded into SRAM
prior to launching the operation.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/marvell/hash.c

@@ -471,6 +471,29 @@ static int mv_cesa_ahash_cache_req(struct ahash_request *req, bool *cached)
 	return 0;
 }
 
+static struct mv_cesa_op_ctx *
+mv_cesa_dma_add_frag(struct mv_cesa_tdma_chain *chain,
+		     struct mv_cesa_op_ctx *tmpl, unsigned int frag_len,
+		     gfp_t flags)
+{
+	struct mv_cesa_op_ctx *op;
+	int ret;
+
+	op = mv_cesa_dma_add_op(chain, tmpl, false, flags);
+	if (IS_ERR(op))
+		return op;
+
+	/* Set the operation block fragment length. */
+	mv_cesa_set_mac_op_frag_len(op, frag_len);
+
+	/* Append dummy desc to launch operation */
+	ret = mv_cesa_dma_add_dummy_launch(chain, flags);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return op;
+}
+
 static struct mv_cesa_op_ctx *
 mv_cesa_ahash_dma_add_cache(struct mv_cesa_tdma_chain *chain,
 			    struct mv_cesa_ahash_dma_iter *dma_iter,
@@ -493,18 +516,9 @@ mv_cesa_ahash_dma_add_cache(struct mv_cesa_tdma_chain *chain,
 	if (ret)
 		return ERR_PTR(ret);
 
-	if (!dma_iter->base.op_len) {
-		op = mv_cesa_dma_add_op(chain, &creq->op_tmpl, false, flags);
-		if (IS_ERR(op))
-			return op;
-
-		mv_cesa_set_mac_op_frag_len(op, creq->cache_ptr);
-
-		/* Add dummy desc to launch crypto operation */
-		ret = mv_cesa_dma_add_dummy_launch(chain, flags);
-		if (ret)
-			return ERR_PTR(ret);
-	}
+	if (!dma_iter->base.op_len)
+		op = mv_cesa_dma_add_frag(chain, &creq->op_tmpl,
+					  creq->cache_ptr, flags);
 
 	return op;
 }
@@ -518,28 +532,22 @@ mv_cesa_ahash_dma_add_data(struct mv_cesa_tdma_chain *chain,
 	struct mv_cesa_op_ctx *op;
 	int ret;
 
-	op = mv_cesa_dma_add_op(chain, &creq->op_tmpl, false, flags);
+	/* Add input transfers */
+	ret = mv_cesa_dma_add_op_transfers(chain, &dma_iter->base,
+					   &dma_iter->src, flags);
+	if (ret)
+		return ERR_PTR(ret);
+
+	op = mv_cesa_dma_add_frag(chain, &creq->op_tmpl, dma_iter->base.op_len,
+				  flags);
 	if (IS_ERR(op))
 		return op;
 
-	mv_cesa_set_mac_op_frag_len(op, dma_iter->base.op_len);
-
 	if (mv_cesa_mac_op_is_first_frag(&creq->op_tmpl))
 		mv_cesa_update_op_cfg(&creq->op_tmpl,
 				      CESA_SA_DESC_CFG_MID_FRAG,
 				      CESA_SA_DESC_CFG_FRAG_MSK);
 
-	/* Add input transfers */
-	ret = mv_cesa_dma_add_op_transfers(chain, &dma_iter->base,
-					   &dma_iter->src, flags);
-	if (ret)
-		return ERR_PTR(ret);
-
-	/* Add dummy desc to launch crypto operation */
-	ret = mv_cesa_dma_add_dummy_launch(chain, flags);
-	if (ret)
-		return ERR_PTR(ret);
-
 	return op;
 }
 
@@ -603,12 +611,6 @@ mv_cesa_ahash_dma_last_req(struct mv_cesa_tdma_chain *chain,
 				      CESA_SA_DESC_CFG_MID_FRAG,
 				      CESA_SA_DESC_CFG_FRAG_MSK);
 
-	op = mv_cesa_dma_add_op(chain, &creq->op_tmpl, false, flags);
-	if (IS_ERR(op))
-		return op;
-
-	mv_cesa_set_mac_op_frag_len(op, trailerlen - padoff);
-
 	ret = mv_cesa_dma_add_data_transfer(chain,
 					    CESA_SA_DATA_SRAM_OFFSET,
 					    ahashdreq->padding_dma +
@@ -619,12 +621,8 @@ mv_cesa_ahash_dma_last_req(struct mv_cesa_tdma_chain *chain,
 	if (ret)
 		return ERR_PTR(ret);
 
-	/* Add dummy desc to launch crypto operation */
-	ret = mv_cesa_dma_add_dummy_launch(chain, flags);
-	if (ret)
-		return ERR_PTR(ret);
-
-	return op;
+	return mv_cesa_dma_add_frag(chain, &creq->op_tmpl, trailerlen - padoff,
+				    flags);
 }
 
 static int mv_cesa_ahash_dma_req_init(struct ahash_request *req)