[3.19.y-ckt stable] Patch "staging: vt6655: vnt_tx_packet fix dma_idx selection." has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    staging: vt6655: vnt_tx_packet fix dma_idx selection.

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt2.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From bfb16bb2d9af57ca7d1fe76977e0c386fdf9f033 Mon Sep 17 00:00:00 2001
From: Malcolm Priestley <tvboxspy at gmail.com>
Date: Mon, 9 Feb 2015 19:11:33 +0000
Subject: staging: vt6655: vnt_tx_packet fix dma_idx selection.

commit c312530589ed9524fc7cc921105dc9b67ea32d6a upstream.

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 <tvboxspy at gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.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 4d29c05..7d9f563 100644
--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -1205,12 +1205,14 @@ 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) {
@@ -1224,6 +1226,9 @@ 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 */
@@ -1252,13 +1257,10 @@ 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);

--
1.9.1