[PATCH v2 04/12] crypto: talitos - move dma mapping code in talitos_submit() into a standalone dma_map_request() function

[Paul Louvel <paul.louvel@bootlin.com>]

Previously added code to talitos_submit() in order to map an entire
descriptor chain.

Move that code into a standalone function to improve readability.

Cc: stable@vger.kernel.org
Signed-off-by: Paul Louvel <paul.louvel@bootlin.com>
---
 drivers/crypto/talitos.c | 79 ++++++++++++++++++++++++++----------------------
 1 file changed, 43 insertions(+), 36 deletions(-)

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index e26689bf7c9d..3b1d8e34e86e 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -256,6 +256,48 @@ static int init_device(struct device *dev)
 	return 0;
 }
 
+static void dma_map_request(struct device *dev, struct talitos_request *request,
+			    struct talitos_desc *desc, bool is_sec1)
+{
+	struct talitos_edesc *edesc =
+		container_of(desc, struct talitos_edesc, desc);
+	dma_addr_t dma_desc, prev_dma_desc;
+	struct talitos_edesc *prev_edesc = NULL;
+
+	if (is_sec1) {
+		request->desc_chain = edesc->node.prev;
+
+		list_for_each_entry(edesc, request->desc_chain, node) {
+			edesc->desc.hdr1 = edesc->desc.hdr;
+
+			dma_desc = dma_map_single(dev, &edesc->desc.hdr1,
+						  TALITOS_DESC_SIZE,
+						  DMA_BIDIRECTIONAL);
+
+			if (!prev_edesc) {
+				request->dma_desc = dma_desc;
+				goto next;
+			}
+
+			/* Chain in any previous descriptors. */
+
+			prev_edesc->desc.next_desc = cpu_to_be32(dma_desc);
+
+			dma_sync_single_for_device(dev, prev_dma_desc,
+						   TALITOS_DESC_SIZE,
+						   DMA_TO_DEVICE);
+
+next:
+			prev_edesc = edesc;
+			prev_dma_desc = dma_desc;
+		}
+	} else {
+		request->dma_desc = dma_map_single(dev, desc, TALITOS_DESC_SIZE,
+						   DMA_BIDIRECTIONAL);
+		request->desc_chain = NULL;
+	}
+}
+
 /**
  * talitos_submit - submits a descriptor to the device for processing
  * @dev:	the SEC device to be used
@@ -274,10 +316,7 @@ static int talitos_submit(struct device *dev, int ch, struct talitos_desc *desc,
 					   void *context, int error),
 			  void *context)
 {
-	struct talitos_edesc *edesc = container_of(desc, struct talitos_edesc, desc);
 	struct talitos_private *priv = dev_get_drvdata(dev);
-	dma_addr_t dma_desc, prev_dma_desc;
-	struct talitos_edesc *prev_edesc = NULL;
 	struct talitos_request *request;
 	unsigned long flags;
 	int head;
@@ -295,39 +334,7 @@ static int talitos_submit(struct device *dev, int ch, struct talitos_desc *desc,
 	request = &priv->chan[ch].fifo[head];
 
 	/* map descriptor and save caller data */
-	if (is_sec1) {
-		request->desc_chain = edesc->node.prev;
-
-		list_for_each_entry(edesc, request->desc_chain, node) {
-			edesc->desc.hdr1 = edesc->desc.hdr;
-
-			dma_desc = dma_map_single(dev, &edesc->desc.hdr1,
-						  TALITOS_DESC_SIZE,
-						  DMA_BIDIRECTIONAL);
-
-			if (!prev_edesc) {
-				request->dma_desc = dma_desc;
-				goto next;
-			}
-
-			/* Chain in any previous descriptors. */
-
-			prev_edesc->desc.next_desc = cpu_to_be32(dma_desc);
-
-			dma_sync_single_for_device(dev, prev_dma_desc,
-						   TALITOS_DESC_SIZE,
-						   DMA_TO_DEVICE);
-
-next:
-			prev_edesc = edesc;
-			prev_dma_desc = dma_desc;
-		}
-	} else {
-		request->dma_desc = dma_map_single(dev, desc,
-						   TALITOS_DESC_SIZE,
-						   DMA_BIDIRECTIONAL);
-		request->desc_chain = NULL;
-	}
+	dma_map_request(dev, request, desc, is_sec1);
 	request->callback = callback;
 	request->context = context;
 

-- 
2.53.0