[PATCH fix for v3.20] staging: vt6655: vnt_tx_packet fix dma_idx selection.

[Malcolm Priestley]

There is still a problem that dma_idx is causing packets to
go onto the wrong tx path.

Protect dma_idx fully with the present first lock and
use pTDInfo->byFlags TD_FLAGS_NETIF_SKB to set MACvTransmit.

Signed-off-by: Malcolm Priestley <tvbox...@gmail.com>
---
 drivers/staging/vt6655/device_main.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/vt6655/device_main.c 
b/drivers/staging/vt6655/device_main.c
index 4324282..f5c5872 100644
--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -1187,12 +1187,14 @@ static int vnt_tx_packet(struct vnt_private *priv, 
struct sk_buff *skb)
 {
        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
        PSTxDesc head_td;
-       u32 dma_idx = TYPE_AC0DMA;
+       u32 dma_idx;
        unsigned long flags;
 
        spin_lock_irqsave(&priv->lock, flags);
 
-       if (!ieee80211_is_data(hdr->frame_control))
+       if (ieee80211_is_data(hdr->frame_control))
+               dma_idx = TYPE_AC0DMA;
+       else
                dma_idx = TYPE_TXDMA0;
 
        if (AVAIL_TD(priv, dma_idx) < 1) {
@@ -1206,6 +1208,9 @@ static int vnt_tx_packet(struct vnt_private *priv, struct 
sk_buff *skb)
 
        head_td->pTDInfo->skb = skb;
 
+       if (dma_idx == TYPE_AC0DMA)
+               head_td->pTDInfo->byFlags = TD_FLAGS_NETIF_SKB;
+
        priv->iTDUsed[dma_idx]++;
 
        /* Take ownership */
@@ -1234,13 +1239,10 @@ static int vnt_tx_packet(struct vnt_private *priv, 
struct sk_buff *skb)
 
        head_td->buff_addr = cpu_to_le32(head_td->pTDInfo->skb_dma);
 
-       if (dma_idx == TYPE_AC0DMA) {
-               head_td->pTDInfo->byFlags = TD_FLAGS_NETIF_SKB;
-
+       if (head_td->pTDInfo->byFlags & TD_FLAGS_NETIF_SKB)
                MACvTransmitAC0(priv->PortOffset);
-       } else {
+       else
                MACvTransmit0(priv->PortOffset);
-       }
 
        spin_unlock_irqrestore(&priv->lock, flags);
 
-- 
2.1.0

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