diff options
Diffstat (limited to 'drivers/spi/spi_imx.c')
| -rw-r--r-- | drivers/spi/spi_imx.c | 45 |
1 files changed, 22 insertions, 23 deletions
diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c index 61ba147..0b4db0c 100644 --- a/drivers/spi/spi_imx.c +++ b/drivers/spi/spi_imx.c @@ -506,20 +506,6 @@ static int map_dma_buffers(struct driver_data *drv_data) if (!IS_DMA_ALIGNED(drv_data->rx) || !IS_DMA_ALIGNED(drv_data->tx)) return -1; - /* NULL rx means write-only transfer and no map needed - since rx DMA will not be used */ - if (drv_data->rx) { - buf = drv_data->rx; - drv_data->rx_dma = dma_map_single( - dev, - buf, - drv_data->len, - DMA_FROM_DEVICE); - if (dma_mapping_error(dev, drv_data->rx_dma)) - return -1; - drv_data->rx_dma_needs_unmap = 1; - } - if (drv_data->tx == NULL) { /* Read only message --> use drv_data->dummy_dma_buf for dummy writes to achive reads */ @@ -533,18 +519,31 @@ static int map_dma_buffers(struct driver_data *drv_data) buf, drv_data->tx_map_len, DMA_TO_DEVICE); - if (dma_mapping_error(dev, drv_data->tx_dma)) { - if (drv_data->rx_dma) { - dma_unmap_single(dev, - drv_data->rx_dma, - drv_data->len, - DMA_FROM_DEVICE); - drv_data->rx_dma_needs_unmap = 0; - } + if (dma_mapping_error(dev, drv_data->tx_dma)) return -1; - } drv_data->tx_dma_needs_unmap = 1; + /* NULL rx means write-only transfer and no map needed + * since rx DMA will not be used */ + if (drv_data->rx) { + buf = drv_data->rx; + drv_data->rx_dma = dma_map_single(dev, + buf, + drv_data->len, + DMA_FROM_DEVICE); + if (dma_mapping_error(dev, drv_data->rx_dma)) { + if (drv_data->tx_dma) { + dma_unmap_single(dev, + drv_data->tx_dma, + drv_data->tx_map_len, + DMA_TO_DEVICE); + drv_data->tx_dma_needs_unmap = 0; + } + return -1; + } + drv_data->rx_dma_needs_unmap = 1; + } + return 0; } |