[PATCH RFC 05/11] crypto: caam - Add cache coherency support to Freescale CAAM scatterlist implementation

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Add cache coherency support to the CAAM scatterlist implementation.

Signed-off-by: Victoria Milhoan <vicki.milhoan@xxxxxxxxxxxxx>
---
 drivers/crypto/caam/sg_sw_sec4.h | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/caam/sg_sw_sec4.h b/drivers/crypto/caam/sg_sw_sec4.h
index 6365585..6730b01 100644
--- a/drivers/crypto/caam/sg_sw_sec4.h
+++ b/drivers/crypto/caam/sg_sw_sec4.h
@@ -91,9 +91,14 @@ static int dma_map_sg_chained(struct device *dev, struct scatterlist *sg,
 {
 	if (unlikely(chained)) {
 		int i;
+	struct scatterlist *tsg = sg;
+
+	/* We use a local copy of the sg pointer to avoid moving the
+	 * head of the list pointed to by sg as we wall the list.
+	 */
 		for (i = 0; i < nents; i++) {
-			dma_map_sg(dev, sg, 1, dir);
-			sg = sg_next(sg);
+			dma_map_sg(dev, tsg, 1, dir);
+			tsg = scatterwalk_sg_next(tsg);
 		}
 	} else {
 		dma_map_sg(dev, sg, nents, dir);
@@ -106,6 +111,9 @@ static int dma_unmap_sg_chained(struct device *dev, struct scatterlist *sg,
 				unsigned int nents, enum dma_data_direction dir,
 				bool chained)
 {
+	if ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))
+		dma_sync_sg_for_cpu(dev, sg, nents, dir);
+
 	if (unlikely(chained)) {
 		int i;
 		for (i = 0; i < nents; i++) {
-- 
2.1.4

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