h63xx: initial omap board support.

[linux-2.6-omap-h63xx.git] / drivers / spi / pxa2xx_spi.c

diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
index dae87b1a4c6effa5c18cff538c3a634a846a2957..cf12f2d84be2c2547fdbe88caf81ea25d733f867 100644 (file)
--- a/drivers/spi/pxa2xx_spi.c
+++ b/drivers/spi/pxa2xx_spi.c
@@ -352,21 +352,21 @@ static int map_dma_buffers(struct driver_data *drv_data)
        } else
                drv_data->tx_map_len = drv_data->len;
 
-       /* Stream map the rx buffer */
-       drv_data->rx_dma = dma_map_single(dev, drv_data->rx,
-                                               drv_data->rx_map_len,
-                                               DMA_FROM_DEVICE);
-       if (dma_mapping_error(dev, drv_data->rx_dma))
-               return 0;
-
-       /* Stream map the tx buffer */
+       /* Stream map the tx buffer. Always do DMA_TO_DEVICE first
+        * so we flush the cache *before* invalidating it, in case
+        * the tx and rx buffers overlap.
+        */
        drv_data->tx_dma = dma_map_single(dev, drv_data->tx,
-                                               drv_data->tx_map_len,
-                                               DMA_TO_DEVICE);
+                                       drv_data->tx_map_len, DMA_TO_DEVICE);
+       if (dma_mapping_error(dev, drv_data->tx_dma))
+               return 0;
 
-       if (dma_mapping_error(dev, drv_data->tx_dma)) {
-               dma_unmap_single(dev, drv_data->rx_dma,
+       /* Stream map the rx buffer */
+       drv_data->rx_dma = dma_map_single(dev, drv_data->rx,
                                        drv_data->rx_map_len, DMA_FROM_DEVICE);
+       if (dma_mapping_error(dev, drv_data->rx_dma)) {
+               dma_unmap_single(dev, drv_data->tx_dma,
+                                       drv_data->tx_map_len, DMA_TO_DEVICE);
                return 0;
        }