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amd-xgbe: Fix DMA API debug warning

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When running a kernel configured with CONFIG_DMA_API_DEBUG=y a warning
is issued:
  DMA-API: device driver tries to sync DMA memory it has not allocated

This warning is the result of mapping the full range of the Rx buffer
pages allocated and then performing a dma_sync_single_for_cpu against
a calculated DMA address. The proper thing to do is to use the
dma_sync_single_range_for_cpu with a base DMA address and an offset.

Reported-by: Kim Phillips <kim.phillips@arm.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Kim Phillips <kim.phillips@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lendacky, Thomas
2015-07-06 11:57:37 -05:00
committed by David S. Miller
parent 95ec655bc4
commit cfbfd86bfd
4 changed files with 22 additions and 12 deletions
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17
drivers/net/ethernet/amd/xgbe/xgbe-drv.c
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@@ -1765,8 +1765,9 @@ static struct sk_buff *xgbe_create_skb(struct xgbe_prv_data *pdata,
/* Start with the header buffer which may contain just the header
* or the header plus data
*/
dma_sync_single_for_cpu(pdata->dev, rdata->rx.hdr.dma,
rdata->rx.hdr.dma_len, DMA_FROM_DEVICE);
dma_sync_single_range_for_cpu(pdata->dev, rdata->rx.hdr.dma_base,
rdata->rx.hdr.dma_off,
rdata->rx.hdr.dma_len, DMA_FROM_DEVICE);
packet = page_address(rdata->rx.hdr.pa.pages) +
rdata->rx.hdr.pa.pages_offset;
@@ -1778,8 +1779,11 @@ static struct sk_buff *xgbe_create_skb(struct xgbe_prv_data *pdata,
len -= copy_len;
if (len) {
/* Add the remaining data as a frag */
dma_sync_single_for_cpu(pdata->dev, rdata->rx.buf.dma,
rdata->rx.buf.dma_len, DMA_FROM_DEVICE);
dma_sync_single_range_for_cpu(pdata->dev,
rdata->rx.buf.dma_base,
rdata->rx.buf.dma_off,
rdata->rx.buf.dma_len,
DMA_FROM_DEVICE);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
rdata->rx.buf.pa.pages,
@@ -1945,8 +1949,9 @@ read_again:
if (!skb)
error = 1;
} else if (rdesc_len) {
dma_sync_single_for_cpu(pdata->dev,
rdata->rx.buf.dma,
dma_sync_single_range_for_cpu(pdata->dev,
rdata->rx.buf.dma_base,
rdata->rx.buf.dma_off,
rdata->rx.buf.dma_len,
DMA_FROM_DEVICE);