[PATCH] via-rhine: link state fix

Problems with link state detection have been reported several times in the
past months.

Denis Vlasenko did all the work tracking it down. Jeff Garzik suggested the
proper place for the fix.

When using the mii library, the driver needs to check mii->force_media
and set dev->state accordingly.

Signed-off-by: Roger Luethi <rl@hellgate.ch>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/via-rhine.c

@@ -1085,6 +1085,25 @@ static void rhine_check_media(struct net_device *dev, unsigned int init_media)
 	else
 	    iowrite8(ioread8(ioaddr + ChipCmd1) & ~Cmd1FDuplex,
 		   ioaddr + ChipCmd1);
+	if (debug > 1)
+		printk(KERN_INFO "%s: force_media %d, carrier %d\n", dev->name,
+			rp->mii_if.force_media, netif_carrier_ok(dev));
+}
+
+/* Called after status of force_media possibly changed */
+void rhine_set_carrier(struct mii_if_info *mii)
+{
+	if (mii->force_media) {
+		/* autoneg is off: Link is always assumed to be up */
+		if (!netif_carrier_ok(mii->dev))
+			netif_carrier_on(mii->dev);
+	}
+	else	/* Let MMI library update carrier status */
+		rhine_check_media(mii->dev, 0);
+	if (debug > 1)
+		printk(KERN_INFO "%s: force_media %d, carrier %d\n",
+		       mii->dev->name, mii->force_media,
+		       netif_carrier_ok(mii->dev));
 }
 
 static void rhine_check_media_task(struct net_device *dev)
@@ -1782,6 +1801,7 @@ static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 	spin_lock_irq(&rp->lock);
 	rc = mii_ethtool_sset(&rp->mii_if, cmd);
 	spin_unlock_irq(&rp->lock);
+	rhine_set_carrier(&rp->mii_if);
 
 	return rc;
 }
@@ -1869,6 +1889,7 @@ static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 	spin_lock_irq(&rp->lock);
 	rc = generic_mii_ioctl(&rp->mii_if, if_mii(rq), cmd, NULL);
 	spin_unlock_irq(&rp->lock);
+	rhine_set_carrier(&rp->mii_if);
 
 	return rc;
 }