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net: stmmac: Fixed the condition of extend_desc for jumbo frame

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This patch fixed the condition of extend_desc for jumbo frame.
There is no check routine for extend_desc in the stmmac_jumbo_frm function.
Even though extend_desc is set if dma_tx is used instead of dma_etx.
It causes kernel panic.

Signed-off-by: Byungho An <bh74.an@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Byungho An 2013-08-08 15:30:26 +09:00 committed by David S. Miller
parent ffbe4a539f
commit 21ff01931e
1 changed files with 11 additions and 2 deletions
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13
drivers/net/ethernet/stmicro/stmmac/ring_mode.c
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@ -33,10 +33,15 @@ static unsigned int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)
struct stmmac_priv *priv = (struct stmmac_priv *)p;
unsigned int txsize = priv->dma_tx_size;
unsigned int entry = priv->cur_tx % txsize;
struct dma_desc *desc = priv->dma_tx + entry;
struct dma_desc *desc;
unsigned int nopaged_len = skb_headlen(skb);
unsigned int bmax, len;
if (priv->extend_desc)
desc = (struct dma_desc *)(priv->dma_etx + entry);
else
desc = priv->dma_tx + entry;
if (priv->plat->enh_desc)
bmax = BUF_SIZE_8KiB;
else
@ -54,7 +59,11 @@ static unsigned int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum)
STMMAC_RING_MODE);
wmb();
entry = (++priv->cur_tx) % txsize;
desc = priv->dma_tx + entry;
if (priv->extend_desc)
desc = (struct dma_desc *)(priv->dma_etx + entry);
else
desc = priv->dma_tx + entry;
desc->des2 = dma_map_single(priv->device, skb->data + bmax,
len, DMA_TO_DEVICE);