---

yaml
---
r: 119527
b: refs/heads/master
c: 4e253d2
h: refs/heads/master
i:
  119525: e116544
  119523: 66cd2c3
  119519: ddaf1e2
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 6a010b56e9bd2fdb32efd153e1a08305949b6b53
+refs/heads/master: 4e253d23003b54c88d0919d6088be74f00eec3c7

trunk/drivers/spi/au1550_spi.c

@@ -369,10 +369,23 @@ static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t)
 	dma_rx_addr = t->rx_dma;
 
 	/*
-	 * check if buffers are already dma mapped, map them otherwise
+	 * check if buffers are already dma mapped, map them otherwise:
+	 * - first map the TX buffer, so cache data gets written to memory
+	 * - then map the RX buffer, so that cache entries (with
+	 *   soon-to-be-stale data) get removed
 	 * use rx buffer in place of tx if tx buffer was not provided
 	 * use temp rx buffer (preallocated or realloc to fit) for rx dma
 	 */
+	if (t->tx_buf) {
+		if (t->tx_dma == 0) {	/* if DMA_ADDR_INVALID, map it */
+			dma_tx_addr = dma_map_single(hw->dev,
+					(void *)t->tx_buf,
+					t->len, DMA_TO_DEVICE);
+			if (dma_mapping_error(hw->dev, dma_tx_addr))
+				dev_err(hw->dev, "tx dma map error\n");
+		}
+	}
+
 	if (t->rx_buf) {
 		if (t->rx_dma == 0) {	/* if DMA_ADDR_INVALID, map it */
 			dma_rx_addr = dma_map_single(hw->dev,
@@ -396,15 +409,8 @@ static int au1550_spi_dma_txrxb(struct spi_device *spi, struct spi_transfer *t)
 		dma_sync_single_for_device(hw->dev, dma_rx_addr,
 			t->len, DMA_FROM_DEVICE);
 	}
-	if (t->tx_buf) {
-		if (t->tx_dma == 0) {	/* if DMA_ADDR_INVALID, map it */
-			dma_tx_addr = dma_map_single(hw->dev,
-					(void *)t->tx_buf,
-					t->len, DMA_TO_DEVICE);
-			if (dma_mapping_error(hw->dev, dma_tx_addr))
-				dev_err(hw->dev, "tx dma map error\n");
-		}
-	} else {
+
+	if (!t->tx_buf) {
 		dma_sync_single_for_device(hw->dev, dma_rx_addr,
 				t->len, DMA_BIDIRECTIONAL);
 		hw->tx = hw->rx;