[PATCH] sundance: solve host error problem in low performance embedded system when continune down and up

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 <jesse@icplus.com.tw>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 23 insertions, 3 deletions

diff --git a/drivers/net/sundance.c b/drivers/net/sundance.c
index fba64d39ba19..02679e688c4c 100644
--- a/drivers/net/sundance.c
+++ b/drivers/net/sundance.c
@@ -1642,6 +1642,14 @@ static int netdev_close(struct net_device *dev)
         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)) {
@@ -1662,9 +1670,20 @@ static int netdev_close(struct net_device *dev)
         /* 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)) {
@@ -1702,6 +1721,7 @@ static int netdev_close(struct net_device *dev)
                 }
         }
         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,