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Message-Id: <1408976531-15589-1-git-send-email-jonas.jensen@gmail.com> Date: Mon, 25 Aug 2014 16:22:11 +0200 From: Jonas Jensen <jonas.jensen@...il.com> To: netdev@...r.kernel.org Cc: davem@...emloft.net, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, f.fainelli@...il.com, eric.dumazet@...il.com, mirqus@...il.com, Jonas Jensen <jonas.jensen@...il.com> Subject: [PATCH v6 1/4] net: moxa: clear DESC1 on ndo_start_xmit() 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@...il.com> --- Notes: Changes since v5: 1. remove readl(desc + TX_REG_OFFSET_DESC1) in moxart_mac_start_xmit() 2. compute entirely new values for DESC1 3. set TX_DESC1_END if (tx_head == TX_DESC_NUM_MASK) Applies to next-20140825 drivers/net/ethernet/moxa/moxart_ether.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/moxa/moxart_ether.c b/drivers/net/ethernet/moxa/moxart_ether.c index 5020fd4..eed70d9 100644 --- a/drivers/net/ethernet/moxa/moxart_ether.c +++ b/drivers/net/ethernet/moxa/moxart_ether.c @@ -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); -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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