Hello.
On 7/15/2015 12:56 AM, Sergei Shtylyov wrote:
First, dma_sync_single_for_cpu() shouldn't have been called in the first place
(it's a streaming DMA API). dma_unmap_single() should have been called instead.
^
Oops, I meant comma here.
Second, dma_unmap_single() call after handing the buffer to napi_gro_receive()
makes little sense.
Moreover, 'desc->dptr' may not be valid at this point...
Signed-off-by: Sergei Shtylyov <sergei.shtyl...@cogentembedded.com>
---
The patch is against Dave Miller's 'net.git' repo.
Don't know why I missed this DMA API misuse while working on the driver. :-<
Dave, do you want me to resend the patch with fixed up changelog?
drivers/net/ethernet/renesas/ravb_main.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
Index: net/drivers/net/ethernet/renesas/ravb_main.c
===================================================================
--- net.orig/drivers/net/ethernet/renesas/ravb_main.c
+++ net/drivers/net/ethernet/renesas/ravb_main.c
[...]
@@ -584,9 +583,6 @@ static bool ravb_rx(struct net_device *n
if (!skb)
break; /* Better luck next round. */
ravb_set_buffer_align(skb);
- dma_unmap_single(&ndev->dev, le32_to_cpu(desc->dptr),
- ALIGN(PKT_BUF_SZ, 16),
- DMA_FROM_DEVICE);
dma_addr = dma_map_single(&ndev->dev, skb->data,
le16_to_cpu(desc->ds_cc),
DMA_FROM_DEVICE);
WBR, Sergei
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