dwc_eth_qos: do not register semi-initialized device

We move register_netdev() to the end of dwceqos_probe() to close any
races where the netdev callbacks are called before the initialization
has finished.

Reported-by: Pavel Andrianov <andrianov@ispras.ru>
Signed-off-by: Lars Persson <larper@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 20 deletions

diff --git a/drivers/net/ethernet/synopsys/dwc_eth_qos.c b/drivers/net/ethernet/synopsys/dwc_eth_qos.c
index 5a3941bf250f..4490ebaed127 100644
--- a/drivers/net/ethernet/synopsys/dwc_eth_qos.c
+++ b/drivers/net/ethernet/synopsys/dwc_eth_qos.c
@@ -1246,7 +1246,7 @@ static int dwceqos_mii_init(struct net_local *lp)
         lp->mii_bus->read  = &dwceqos_mdio_read;
         lp->mii_bus->write = &dwceqos_mdio_write;
         lp->mii_bus->priv = lp;
-        lp->mii_bus->parent = &lp->ndev->dev;
+        lp->mii_bus->parent = &lp->pdev->dev;
 
         of_address_to_resource(lp->pdev->dev.of_node, 0, &res);
         snprintf(lp->mii_bus->id, MII_BUS_ID_SIZE, "%.8llx",
@@ -2853,25 +2853,17 @@ static int dwceqos_probe(struct platform_device *pdev)
 
         ndev->features = ndev->hw_features;
 
-        netif_napi_add(ndev, &lp->napi, dwceqos_rx_poll, NAPI_POLL_WEIGHT);
-
-        ret = register_netdev(ndev);
-        if (ret) {
-                dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
-                goto err_out_clk_dis_aper;
-        }
-
         lp->phy_ref_clk = devm_clk_get(&pdev->dev, "phy_ref_clk");
         if (IS_ERR(lp->phy_ref_clk)) {
                 dev_err(&pdev->dev, "phy_ref_clk clock not found.\n");
                 ret = PTR_ERR(lp->phy_ref_clk);
-                goto err_out_unregister_netdev;
+                goto err_out_clk_dis_aper;
         }
 
         ret = clk_prepare_enable(lp->phy_ref_clk);
         if (ret) {
                 dev_err(&pdev->dev, "Unable to enable device clock.\n");
-                goto err_out_unregister_netdev;
+                goto err_out_clk_dis_aper;
         }
 
         lp->phy_node = of_parse_phandle(lp->pdev->dev.of_node,
@@ -2880,7 +2872,7 @@ static int dwceqos_probe(struct platform_device *pdev)
                 ret = of_phy_register_fixed_link(lp->pdev->dev.of_node);
                 if (ret < 0) {
                         dev_err(&pdev->dev, "invalid fixed-link");
-                        goto err_out_unregister_clk_notifier;
+                        goto err_out_clk_dis_phy;
                 }
 
                 lp->phy_node = of_node_get(lp->pdev->dev.of_node);
@@ -2889,7 +2881,7 @@ static int dwceqos_probe(struct platform_device *pdev)
         ret = of_get_phy_mode(lp->pdev->dev.of_node);
         if (ret < 0) {
                 dev_err(&lp->pdev->dev, "error in getting phy i/f\n");
-                goto err_out_unregister_clk_notifier;
+                goto err_out_clk_dis_phy;
         }
 
         lp->phy_interface = ret;
@@ -2897,14 +2889,14 @@ static int dwceqos_probe(struct platform_device *pdev)
         ret = dwceqos_mii_init(lp);
         if (ret) {
                 dev_err(&lp->pdev->dev, "error in dwceqos_mii_init\n");
-                goto err_out_unregister_clk_notifier;
+                goto err_out_clk_dis_phy;
         }
 
         ret = dwceqos_mii_probe(ndev);
         if (ret != 0) {
                 netdev_err(ndev, "mii_probe fail.\n");
                 ret = -ENXIO;
-                goto err_out_unregister_clk_notifier;
+                goto err_out_clk_dis_phy;
         }
 
         dwceqos_set_umac_addr(lp, lp->ndev->dev_addr, 0);
@@ -2922,7 +2914,7 @@ static int dwceqos_probe(struct platform_device *pdev)
         if (ret) {
                 dev_err(&lp->pdev->dev, "Unable to retrieve DT, error %d\n",
                         ret);
-                goto err_out_unregister_clk_notifier;
+                goto err_out_clk_dis_phy;
         }
         dev_info(&lp->pdev->dev, "pdev->id %d, baseaddr 0x%08lx, irq %d\n",
                  pdev->id, ndev->base_addr, ndev->irq);
@@ -2932,18 +2924,24 @@ static int dwceqos_probe(struct platform_device *pdev)
         if (ret) {
                 dev_err(&lp->pdev->dev, "Unable to request IRQ %d, error %d\n",
                         ndev->irq, ret);
-                goto err_out_unregister_clk_notifier;
+                goto err_out_clk_dis_phy;
         }
 
         if (netif_msg_probe(lp))
                 netdev_dbg(ndev, "net_local@%p\n", lp);
 
+        netif_napi_add(ndev, &lp->napi, dwceqos_rx_poll, NAPI_POLL_WEIGHT);
+
+        ret = register_netdev(ndev);
+        if (ret) {
+                dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
+                        goto err_out_clk_dis_phy;
+        }
+
         return 0;
 
-err_out_unregister_clk_notifier:
+err_out_clk_dis_phy:
         clk_disable_unprepare(lp->phy_ref_clk);
-err_out_unregister_netdev:
-        unregister_netdev(ndev);
 err_out_clk_dis_aper:
         clk_disable_unprepare(lp->apb_pclk);
 err_out_free_netdev: