From: Jesse Huang Solve host error problem in low performance embedded system when continune down and up. It will cause IP100A DMA TargetAbort. So we need more safe process to up and down IP100A with wait hardware completely stop and software cur_tx/ dirty_tx/cur_task/last_tx be clear. Signed-off-by: Jesse Huang Signed-off-by: Andrew Morton --- drivers/net/sundance.c | 26 +++++++++++++++++++++++--- 1 files changed, 23 insertions(+), 3 deletions(-) diff -puN drivers/net/sundance.c~sundance-solve-host-error-problem-in-low-performance-embedded drivers/net/sundance.c --- a/drivers/net/sundance.c~sundance-solve-host-error-problem-in-low-performance-embedded +++ a/drivers/net/sundance.c @@ -1643,6 +1643,14 @@ static int netdev_close(struct net_devic struct sk_buff *skb; int i; + /* Wait and kill tasklet */ + tasklet_kill(&np->rx_tasklet); + tasklet_kill(&np->tx_tasklet); + np->cur_tx = 0; + np->dirty_tx = 0; + np->cur_task = 0; + np->last_tx = 0; + netif_stop_queue(dev); if (netif_msg_ifdown(np)) { @@ -1663,9 +1671,20 @@ static int netdev_close(struct net_devic /* Stop the chip's Tx and Rx processes. */ iowrite16(TxDisable | RxDisable | StatsDisable, ioaddr + MACCtrl1); - /* Wait and kill tasklet */ - tasklet_kill(&np->rx_tasklet); - tasklet_kill(&np->tx_tasklet); + for (i = 2000; i > 0; i--) { + if ((ioread32(ioaddr + DMACtrl) & 0xc000) == 0) + break; + mdelay(1); + } + + iowrite16(GlobalReset | DMAReset | FIFOReset | NetworkReset, + ioaddr +ASICCtrl + 2); + + for (i = 2000; i > 0; i--) { + if ((ioread16(ioaddr + ASICCtrl +2) & ResetBusy) == 0) + break; + mdelay(1); + } #ifdef __i386__ if (netif_msg_hw(np)) { @@ -1703,6 +1722,7 @@ static int netdev_close(struct net_devic } } for (i = 0; i < TX_RING_SIZE; i++) { + np->tx_ring[i].next_desc = 0; skb = np->tx_skbuff[i]; if (skb) { pci_unmap_single(np->pci_dev, _