spi: s3c64xx: Use dmaengine_prep_slave_single() to prepare DMA transfers

Since the driver supports only contiguous buffers, there is no need to
manually construct a scatterlist with just a single entry, when there is
a dedicated helper for this purpose.

This patch modifies prepare_dma() function to use available helper instead
of manually creating a scatterlist.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 2 insertions, 9 deletions

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 2330dceb27cc..a7a739c89488 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -389,7 +389,6 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
 {
         struct s3c64xx_spi_driver_data *sdd;
         struct dma_slave_config config;
-        struct scatterlist sg;
         struct dma_async_tx_descriptor *desc;
 
         memset(&config, 0, sizeof(config));
@@ -412,14 +411,8 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
                 dmaengine_slave_config(dma->ch, &config);
         }
 
-        sg_init_table(&sg, 1);
-        sg_dma_len(&sg) = len;
-        sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf)),
-                    len, offset_in_page(buf));
-        sg_dma_address(&sg) = buf;
-
-        desc = dmaengine_prep_slave_sg(dma->ch,
-                &sg, 1, dma->direction, DMA_PREP_INTERRUPT);
+        desc = dmaengine_prep_slave_single(dma->ch, buf, len,
+                                        dma->direction, DMA_PREP_INTERRUPT);
 
         desc->callback = s3c64xx_spi_dmacb;
         desc->callback_param = dma;