| Message ID | 1408976531-15589-1-git-send-email-jonas.jensen@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
From: Jonas Jensen <jonas.jensen@gmail.com> Date: Mon, 25 Aug 2014 16:22:11 +0200 > 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> Applied.
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);
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> --- 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(-)