linux-kernel - [PATCH 5/5] Solve host error problem in low performance embedded system when continune down and up.

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Message-Id: <1160855860.2266.9.camel@localhost.localdomain>
Date:	Sat, 14 Oct 2006 15:57:40 -0400
From:	Jesse Huang <jesse@...lus.com.tw>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	akpm@...l.org, jgarzik@...ox.com, jesse@...lus.com.tw
Subject: [PATCH 5/5] Solve host error problem in low performance embedded
	system when continune down and up.

From: Jesse Huang <jesse@...lus.com.tw>

Change Logs:
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@...lus.com.tw>
---

 drivers/net/sundance.c |   26 +++++++++++++++++++++++---
 1 files changed, 23 insertions(+), 3 deletions(-)

c06c70e20a85facd640528ca66e0b579fc3ee745
diff --git a/drivers/net/sundance.c b/drivers/net/sundance.c
index 14b4933..b4a6010 100755
--- a/drivers/net/sundance.c
+++ b/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 @@ #endif /* __i386__ debugging only */
 		}
 	}
 	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,
-- 
1.3.GIT



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