DM9000: Use delayed work to update MII PHY state

Periodically check the MII PHY status to ensure that the
network layer's link status is updated and the user informed
of any changes.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/dm9000.c

@@ -117,6 +117,9 @@ typedef struct board_info {
 
 	struct mutex	 addr_lock;	/* phy and eeprom access lock */
 
+	struct delayed_work phy_poll;
+	struct net_device  *ndev;
+
 	spinlock_t lock;
 
 	struct mii_if_info mii;
@@ -297,6 +300,10 @@ static void dm9000_set_io(struct board_info *db, int byte_width)
 	}
 }
 
+static void dm9000_schedule_poll(board_info_t *db)
+{
+	schedule_delayed_work(&db->phy_poll, HZ * 2);
+}
 
 /* Our watchdog timed out. Called by the networking layer */
 static void dm9000_timeout(struct net_device *dev)
@@ -465,6 +472,17 @@ static const struct ethtool_ops dm9000_ethtool_ops = {
  	.set_eeprom		= dm9000_set_eeprom,
 };
 
+static void
+dm9000_poll_work(struct work_struct *w)
+{
+	struct delayed_work *dw = container_of(w, struct delayed_work, work);
+	board_info_t *db = container_of(dw, board_info_t, phy_poll);
+
+	mii_check_media(&db->mii, netif_msg_link(db), 0);
+
+	if (netif_running(db->ndev))
+		dm9000_schedule_poll(db);
+}
 
 /* dm9000_release_board
  *
@@ -532,10 +550,14 @@ dm9000_probe(struct platform_device *pdev)
 	memset(db, 0, sizeof (*db));
 
 	db->dev = &pdev->dev;
+	db->ndev = ndev;
 
 	spin_lock_init(&db->lock);
 	mutex_init(&db->addr_lock);
 
+	INIT_DELAYED_WORK(&db->phy_poll, dm9000_poll_work);
+
+
 	if (pdev->num_resources < 2) {
 		ret = -ENODEV;
 		goto out;
@@ -761,6 +783,8 @@ dm9000_open(struct net_device *dev)
 
 	mii_check_media(&db->mii, netif_msg_link(db), 1);
 	netif_start_queue(dev);
+
+	dm9000_schedule_poll(db);
 
 	return 0;
 }
@@ -879,6 +903,8 @@ dm9000_stop(struct net_device *ndev)
 	if (netif_msg_ifdown(db))
 		dev_dbg(db->dev, "shutting down %s\n", ndev->name);
 
+	cancel_delayed_work(&db->phy_poll);
+
 	netif_stop_queue(ndev);
 	netif_carrier_off(ndev);