| From | Kamal Mostafa <> | Subject | [PATCH 3.8 55/81] ll_temac: Reset dma descriptors indexes on ndo_open | Date | Tue, 29 Oct 2013 11:04:16 -0700 |
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3.8.13.12 -stable review patch. If anyone has any objections, please let me know.
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From: Ricardo Ribalda <ricardo.ribalda@gmail.com>
[ Upstream commit 7167cf0e8cd10287b7912b9ffcccd9616f382922 ]
The dma descriptors indexes are only initialized on the probe function.
If a packet is on the buffer when temac_stop is called, the dma descriptors indexes can be left on a incorrect state where no other package can be sent.
So an interface could be left in an usable state after ifdow/ifup.
This patch makes sure that the descriptors indexes are in a proper status when the device is open.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/net/ethernet/xilinx/ll_temac_main.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c index aad909d..33c111d 100644 --- a/drivers/net/ethernet/xilinx/ll_temac_main.c +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c @@ -308,6 +308,12 @@ static int temac_dma_bd_init(struct net_device *ndev) lp->rx_bd_p + (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1))); lp->dma_out(lp, TX_CURDESC_PTR, lp->tx_bd_p); + /* Init descriptor indexes */ + lp->tx_bd_ci = 0; + lp->tx_bd_next = 0; + lp->tx_bd_tail = 0; + lp->rx_bd_ci = 0; + return 0; out: -- 1.8.1.2
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