From: <sean.wang@mediatek.com>
To: <john@phrozen.org>, <davem@davemloft.net>
Cc: <nbd@openwrt.org>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-mediatek@lists.infradead.org>, <keyhaede@gmail.com>,
Sean Wang <sean.wang@mediatek.com>
Subject: [PATCH v2 net 1/2] net: ethernet: mediatek: fix inconsistency between TXD and the used buffer
Date: Fri, 14 Apr 2017 11:19:11 +0800 [thread overview]
Message-ID: <1492139952-8104-2-git-send-email-sean.wang@mediatek.com> (raw)
In-Reply-To: <1492139952-8104-1-git-send-email-sean.wang@mediatek.com>
From: Sean Wang <sean.wang@mediatek.com>
Fix inconsistency between the TXD descriptor and the used buffer that
would cause unexpected logic at mtk_tx_unmap() during skb housekeeping.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
---
drivers/net/ethernet/mediatek/mtk_eth_soc.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 14e1bd1..48ba617 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -613,7 +613,7 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
struct mtk_mac *mac = netdev_priv(dev);
struct mtk_eth *eth = mac->hw;
struct mtk_tx_dma *itxd, *txd;
- struct mtk_tx_buf *tx_buf;
+ struct mtk_tx_buf *itx_buf, *tx_buf;
dma_addr_t mapped_addr;
unsigned int nr_frags;
int i, n_desc = 1;
@@ -627,8 +627,8 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
fport = (mac->id + 1) << TX_DMA_FPORT_SHIFT;
txd4 |= fport;
- tx_buf = mtk_desc_to_tx_buf(ring, itxd);
- memset(tx_buf, 0, sizeof(*tx_buf));
+ itx_buf = mtk_desc_to_tx_buf(ring, itxd);
+ memset(itx_buf, 0, sizeof(*itx_buf));
if (gso)
txd4 |= TX_DMA_TSO;
@@ -647,9 +647,9 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
return -ENOMEM;
WRITE_ONCE(itxd->txd1, mapped_addr);
- tx_buf->flags |= MTK_TX_FLAGS_SINGLE0;
- dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr);
- dma_unmap_len_set(tx_buf, dma_len0, skb_headlen(skb));
+ itx_buf->flags |= MTK_TX_FLAGS_SINGLE0;
+ dma_unmap_addr_set(itx_buf, dma_addr0, mapped_addr);
+ dma_unmap_len_set(itx_buf, dma_len0, skb_headlen(skb));
/* TX SG offload */
txd = itxd;
@@ -685,10 +685,9 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
last_frag * TX_DMA_LS0));
WRITE_ONCE(txd->txd4, fport);
- tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC;
tx_buf = mtk_desc_to_tx_buf(ring, txd);
memset(tx_buf, 0, sizeof(*tx_buf));
-
+ tx_buf->skb = (struct sk_buff *)MTK_DMA_DUMMY_DESC;
tx_buf->flags |= MTK_TX_FLAGS_PAGE0;
dma_unmap_addr_set(tx_buf, dma_addr0, mapped_addr);
dma_unmap_len_set(tx_buf, dma_len0, frag_map_size);
@@ -698,7 +697,7 @@ static int mtk_tx_map(struct sk_buff *skb, struct net_device *dev,
}
/* store skb to cleanup */
- tx_buf->skb = skb;
+ itx_buf->skb = skb;
WRITE_ONCE(itxd->txd4, txd4);
WRITE_ONCE(itxd->txd3, (TX_DMA_SWC | TX_DMA_PLEN0(skb_headlen(skb)) |
--
1.9.1
next prev parent reply other threads:[~2017-04-14 3:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-14 3:19 [PATCH v2 net 0/2] Fix crash caused by reporting inconsistent skb->len to BQL sean.wang
2017-04-14 3:19 ` sean.wang [this message]
2017-04-14 3:19 ` [PATCH v2 net 2/2] net: ethernet: mediatek: fix inconsistency of port number carried in TXD sean.wang
2017-04-17 17:34 ` [PATCH v2 net 0/2] Fix crash caused by reporting inconsistent skb->len to BQL David Miller
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