Messages in this thread Patch in this message | | | Date | Mon, 28 Feb 2011 08:23:16 -0800 | From | Greg KH <> | Subject | [55/68] p54pci: update receive dma buffers before and after processing |
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2.6.32-longterm review patch. If anyone has any objections, please let us know.
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From: Christian Lamparter <chunkeey@googlemail.com>
commit 0bf719dfdecc5552155cbec78e49fa06e531e35c upstream.
Documentation/DMA-API-HOWTO.txt states:
"DMA transfers need to be synced properly in order for the cpu and device to see the most uptodate and correct copy of the DMA buffer."
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/net/wireless/p54/p54pci.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)
--- a/drivers/net/wireless/p54/p54pci.c +++ b/drivers/net/wireless/p54/p54pci.c @@ -198,6 +198,7 @@ static void p54p_check_rx_ring(struct ie while (i != idx) { u16 len; struct sk_buff *skb; + dma_addr_t dma_addr; desc = &ring[i]; len = le16_to_cpu(desc->len); skb = rx_buf[i]; @@ -215,17 +216,20 @@ static void p54p_check_rx_ring(struct ie len = priv->common.rx_mtu; } + dma_addr = le32_to_cpu(desc->host_addr); + pci_dma_sync_single_for_cpu(priv->pdev, dma_addr, + priv->common.rx_mtu + 32, PCI_DMA_FROMDEVICE); skb_put(skb, len); if (p54_rx(dev, skb)) { - pci_unmap_single(priv->pdev, - le32_to_cpu(desc->host_addr), - priv->common.rx_mtu + 32, - PCI_DMA_FROMDEVICE); + pci_unmap_single(priv->pdev, dma_addr, + priv->common.rx_mtu + 32, PCI_DMA_FROMDEVICE); rx_buf[i] = NULL; - desc->host_addr = 0; + desc->host_addr = cpu_to_le32(0); } else { skb_trim(skb, 0); + pci_dma_sync_single_for_device(priv->pdev, dma_addr, + priv->common.rx_mtu + 32, PCI_DMA_FROMDEVICE); desc->len = cpu_to_le16(priv->common.rx_mtu + 32); }
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