netdev - [PATCH 2/3] NET: MIPS: lantiq: non existing phy was not handled gracefully

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Date:	Wed, 16 Nov 2011 15:41:47 +0100
From:	John Crispin <blogic@...nwrt.org>
To:	netdev@...r.kernel.org
Cc:	John Crispin <blogic@...nwrt.org>
Subject: [PATCH 2/3] NET: MIPS: lantiq: non existing phy was not handled gracefully

The code blindly assumed that that a PHY device was present causing a BadVA.
In addition the driver should not fail to load incase no PHY was found.
Instead we print the following line and continue with no attached PHY.

   etop: mdio probe failed

Signed-off-by: John Crispin <blogic@...nwrt.org>
Cc: netdev@...r.kernel.org
---
 drivers/net/ethernet/lantiq_etop.c |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/lantiq_etop.c b/drivers/net/ethernet/lantiq_etop.c
index d3d4931..9fd6779 100644
--- a/drivers/net/ethernet/lantiq_etop.c
+++ b/drivers/net/ethernet/lantiq_etop.c
@@ -612,7 +612,8 @@ ltq_etop_open(struct net_device *dev)
 		ltq_dma_open(&ch->dma);
 		napi_enable(&ch->napi);
 	}
-	phy_start(priv->phydev);
+	if (priv->phydev)
+		phy_start(priv->phydev);
 	netif_tx_start_all_queues(dev);
 	return 0;
 }
@@ -624,7 +625,8 @@ ltq_etop_stop(struct net_device *dev)
 	int i;
 
 	netif_tx_stop_all_queues(dev);
-	phy_stop(priv->phydev);
+	if (priv->phydev)
+		phy_stop(priv->phydev);
 	for (i = 0; i < MAX_DMA_CHAN; i++) {
 		struct ltq_etop_chan *ch = &priv->ch[i];
 
@@ -770,9 +772,10 @@ ltq_etop_init(struct net_device *dev)
 	if (err)
 		goto err_netdev;
 	ltq_etop_set_multicast_list(dev);
-	err = ltq_etop_mdio_init(dev);
-	if (err)
-		goto err_netdev;
+	if (!ltq_etop_mdio_init(dev))
+		dev->ethtool_ops = &ltq_etop_ethtool_ops;
+	else
+		pr_warn("etop: mdio probe failed\n");;
 	return 0;
 
 err_netdev:
@@ -868,7 +871,6 @@ ltq_etop_probe(struct platform_device *pdev)
 	dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4);
 	strcpy(dev->name, "eth%d");
 	dev->netdev_ops = &ltq_eth_netdev_ops;
-	dev->ethtool_ops = &ltq_etop_ethtool_ops;
 	priv = netdev_priv(dev);
 	priv->res = res;
 	priv->pldata = dev_get_platdata(&pdev->dev);
-- 
1.7.7.1

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