netdev - [PATCH] ks8842: Fix TX cache flush issue

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Date:	Mon, 22 Nov 2010 13:50:57 +0100
From:	Richard Röjfors 
	<richard.rojfors@...agicore.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, ferringb@...il.com
Subject: [PATCH] ks8842: Fix TX cache flush issue

This patch fixes a cache sync issue found in MeeGo 1.1.

It was found that bytes after the first 64 of the TX buffer was not
flushed from the cache correctly.

The patch switches out kmalloc/dma_map_single/dma_sync_single_for_device
to dma_alloc_coherent.

Signed-off-by: Richard Röjfors <richard.rojfors@...agicore.com>
---
diff --git a/drivers/net/ks8842.c b/drivers/net/ks8842.c
index 928b2b8..55a11ba 100644
--- a/drivers/net/ks8842.c
+++ b/drivers/net/ks8842.c
@@ -449,10 +449,6 @@ static int ks8842_tx_frame_dma(struct sk_buff *skb, struct net_device *netdev)
 	*buf++ = (skb->len >> 8) & 0xff;
 	skb_copy_from_linear_data(skb, buf, skb->len);
 
-	dma_sync_single_range_for_device(adapter->dev,
-		sg_dma_address(&ctl->sg), 0, sg_dma_len(&ctl->sg),
-		DMA_TO_DEVICE);
-
 	/* make sure the length is a multiple of 4 */
 	if (sg_dma_len(&ctl->sg) % 4)
 		sg_dma_len(&ctl->sg) += 4 - sg_dma_len(&ctl->sg) % 4;
@@ -908,12 +904,10 @@ static void ks8842_dealloc_dma_bufs(struct ks8842_adapter *adapter)
 
 	tasklet_kill(&rx_ctl->tasklet);
 
-	if (sg_dma_address(&tx_ctl->sg))
-		dma_unmap_single(adapter->dev, sg_dma_address(&tx_ctl->sg),
-			DMA_BUFFER_SIZE, DMA_TO_DEVICE);
+	if (tx_ctl->buf)
+		dma_free_coherent(adapter->dev, DMA_BUFFER_SIZE,
+			tx_ctl->buf, sg_dma_address(&tx_ctl->sg));
 	sg_dma_address(&tx_ctl->sg) = 0;
-
-	kfree(tx_ctl->buf);
 	tx_ctl->buf = NULL;
 }
 
@@ -945,21 +939,13 @@ static int ks8842_alloc_dma_bufs(struct net_device *netdev)
 	}
 
 	/* allocate DMA buffer */
-	tx_ctl->buf = kmalloc(DMA_BUFFER_SIZE, GFP_KERNEL);
+	tx_ctl->buf = dma_alloc_coherent(adapter->dev, DMA_BUFFER_SIZE,
+		&sg_dma_address(&tx_ctl->sg), GFP_KERNEL);
 	if (!tx_ctl->buf) {
 		err = -ENOMEM;
 		goto err;
 	}
 
-	sg_dma_address(&tx_ctl->sg) = dma_map_single(adapter->dev,
-		tx_ctl->buf, DMA_BUFFER_SIZE, DMA_TO_DEVICE);
-	err = dma_mapping_error(adapter->dev,
-		sg_dma_address(&tx_ctl->sg));
-	if (err) {
-		sg_dma_address(&tx_ctl->sg) = 0;
-		goto err;
-	}
-
 	rx_ctl->chan = dma_request_channel(mask, ks8842_dma_filter_fn,
 					   (void *)(long)rx_ctl->channel);
 	if (!rx_ctl->chan) {

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