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net: moxa: clear DESC1 on ndo_start_xmit()

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TX buffer length is not cleared on ndo_start_xmit().
Failing to do so can bug/hang the controller and
cause TX interrupts to stop altogether.

Remove the readl() and compute a new value for DESC1.

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=69031

Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jonas Jensen 2014-08-25 16:22:11 +02:00 committed by David S. Miller
parent db115037bb
commit b853f31940
1 changed files with 3 additions and 4 deletions
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7
drivers/net/ethernet/moxa/moxart_ether.c
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@ -346,10 +346,9 @@ static int moxart_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
len = ETH_ZLEN;
}
txdes1 = readl(desc + TX_REG_OFFSET_DESC1);
txdes1 |= TX_DESC1_LTS | TX_DESC1_FTS;
txdes1 &= ~(TX_DESC1_FIFO_COMPLETE | TX_DESC1_INTR_COMPLETE);
txdes1 |= (len & TX_DESC1_BUF_SIZE_MASK);
txdes1 = TX_DESC1_LTS | TX_DESC1_FTS | (len & TX_DESC1_BUF_SIZE_MASK);
if (tx_head == TX_DESC_NUM_MASK)
txdes1 |= TX_DESC1_END;
writel(txdes1, desc + TX_REG_OFFSET_DESC1);
writel(TX_DESC0_DMA_OWN, desc + TX_REG_OFFSET_DESC0);