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staging: vt6655: vnt_tx_packet Correct TX order of OWNED_BY_NIC
The state of m_td0TD0.f1Owner should change after the buff_addr has been filled otherwise the device grabs the buffer too early. m_td0TD0.f1Owner is protected by memory barriers on both sides of change. iTDUsed is best incremented after MACvTransmit. It appears that f1Owner actually polls to do the memory transfer. A back port patch will be needed for v3.19 Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com> Cc: <stable@vger.kernel.org> # v4.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 7 additions and 8 deletions
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@ -1206,14 +1206,6 @@ static int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
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if (dma_idx == TYPE_AC0DMA)
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head_td->pTDInfo->byFlags = TD_FLAGS_NETIF_SKB;
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priv->iTDUsed[dma_idx]++;
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/* Take ownership */
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wmb();
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head_td->m_td0TD0.f1Owner = OWNED_BY_NIC;
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/* get Next */
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wmb();
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priv->apCurrTD[dma_idx] = head_td->next;
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spin_unlock_irqrestore(&priv->lock, flags);
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@ -1234,11 +1226,18 @@ static int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
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head_td->buff_addr = cpu_to_le32(head_td->pTDInfo->skb_dma);
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/* Poll Transmit the adapter */
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wmb();
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head_td->m_td0TD0.f1Owner = OWNED_BY_NIC;
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wmb(); /* second memory barrier */
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if (head_td->pTDInfo->byFlags & TD_FLAGS_NETIF_SKB)
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MACvTransmitAC0(priv->PortOffset);
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else
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MACvTransmit0(priv->PortOffset);
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priv->iTDUsed[dma_idx]++;
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spin_unlock_irqrestore(&priv->lock, flags);
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return 0;
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