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[PATCH] subdance: fix TX Pause bug (reset_tx, intr_handler)

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Fix TX Pause bug (reset_tx, intr_handler).  When MaxCollisions occurred, need
to re-enable Tx.  But just after re-enable, MaxCollisions maybe occurred again
and with TxStatusOverflow.  This will cause driver can't check new
MaxCollisions to re-enable Tx again, because TxStatusOverflow.  For this
reason, after re-enable Tx, we need to make sure Tx was actually enabled.

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>
This commit is contained in:
Jesse Huang 2006-10-20 14:42:11 -07:00 committed by Jeff Garzik
parent e242040df1
commit 2109f89f34
1 changed files with 14 additions and 2 deletions
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16
drivers/net/sundance.c
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@ -1079,6 +1079,8 @@ reset_tx (struct net_device *dev)
/* free all tx skbuff */
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,
@ -1094,6 +1096,10 @@ reset_tx (struct net_device *dev)
}
np->cur_tx = np->dirty_tx = 0;
np->cur_task = 0;
np->last_tx = 0;
iowrite8(127, ioaddr + TxDMAPollPeriod);
iowrite16 (StatsEnable | RxEnable | TxEnable, ioaddr + MACCtrl1);
return 0;
}
@ -1162,8 +1168,14 @@ static irqreturn_t intr_handler(int irq, void *dev_instance)
sundance_reset(dev, (NetworkReset|FIFOReset|TxReset) << 16);
/* No need to reset the Tx pointer here */
}
/* Restart the Tx. */
iowrite16 (TxEnable, ioaddr + MACCtrl1);
/* Restart the Tx. Need to make sure tx enabled */
i = 10;
do {
iowrite16(ioread16(ioaddr + MACCtrl1) | TxEnable, ioaddr + MACCtrl1);
if (ioread16(ioaddr + MACCtrl1) & TxEnabled)
break;
mdelay(1);
} while (--i);
}
/* Yup, this is a documentation bug. It cost me *hours*. */
iowrite16 (0, ioaddr + TxStatus);