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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>
This commit is contained in:
Lars Persson 2016-09-08 13:24:21 +02:00 committed by David S. Miller
parent 7303a14750
commit 47b02f7294
1 changed files with 18 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/net/ethernet/synopsys/dwc_eth_qos.c
View File

@ -1246,7 +1246,7 @@ static int dwceqos_mii_init(struct net_local *lp)
lp->mii_bus->read = &dwceqos_mdio_read; lp->mii_bus->read = &dwceqos_mdio_read;
lp->mii_bus->write = &dwceqos_mdio_write; lp->mii_bus->write = &dwceqos_mdio_write;
lp->mii_bus->priv = lp; 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); of_address_to_resource(lp->pdev->dev.of_node, 0, &res);
snprintf(lp->mii_bus->id, MII_BUS_ID_SIZE, "%.8llx", 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; 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"); lp->phy_ref_clk = devm_clk_get(&pdev->dev, "phy_ref_clk");
if (IS_ERR(lp->phy_ref_clk)) { if (IS_ERR(lp->phy_ref_clk)) {
dev_err(&pdev->dev, "phy_ref_clk clock not found.\n"); dev_err(&pdev->dev, "phy_ref_clk clock not found.\n");
ret = PTR_ERR(lp->phy_ref_clk); 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); ret = clk_prepare_enable(lp->phy_ref_clk);
if (ret) { if (ret) {
dev_err(&pdev->dev, "Unable to enable device clock.\n"); 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, 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); ret = of_phy_register_fixed_link(lp->pdev->dev.of_node);
if (ret < 0) { if (ret < 0) {
dev_err(&pdev->dev, "invalid fixed-link"); 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); 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); ret = of_get_phy_mode(lp->pdev->dev.of_node);
if (ret < 0) { if (ret < 0) {
dev_err(&lp->pdev->dev, "error in getting phy i/f\n"); 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; lp->phy_interface = ret;
@ -2897,14 +2889,14 @@ static int dwceqos_probe(struct platform_device *pdev)
ret = dwceqos_mii_init(lp); ret = dwceqos_mii_init(lp);
if (ret) { if (ret) {
dev_err(&lp->pdev->dev, "error in dwceqos_mii_init\n"); 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); ret = dwceqos_mii_probe(ndev);
if (ret != 0) { if (ret != 0) {
netdev_err(ndev, "mii_probe fail.\n"); netdev_err(ndev, "mii_probe fail.\n");
ret = -ENXIO; ret = -ENXIO;
goto err_out_unregister_clk_notifier; goto err_out_clk_dis_phy;
} }
dwceqos_set_umac_addr(lp, lp->ndev->dev_addr, 0); dwceqos_set_umac_addr(lp, lp->ndev->dev_addr, 0);
@ -2922,7 +2914,7 @@ static int dwceqos_probe(struct platform_device *pdev)
if (ret) { if (ret) {
dev_err(&lp->pdev->dev, "Unable to retrieve DT, error %d\n", dev_err(&lp->pdev->dev, "Unable to retrieve DT, error %d\n",
ret); 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", dev_info(&lp->pdev->dev, "pdev->id %d, baseaddr 0x%08lx, irq %d\n",
pdev->id, ndev->base_addr, ndev->irq); pdev->id, ndev->base_addr, ndev->irq);
@ -2932,18 +2924,24 @@ static int dwceqos_probe(struct platform_device *pdev)
if (ret) { if (ret) {
dev_err(&lp->pdev->dev, "Unable to request IRQ %d, error %d\n", dev_err(&lp->pdev->dev, "Unable to request IRQ %d, error %d\n",
ndev->irq, ret); ndev->irq, ret);
goto err_out_unregister_clk_notifier; goto err_out_clk_dis_phy;
} }
if (netif_msg_probe(lp)) if (netif_msg_probe(lp))
netdev_dbg(ndev, "net_local@%p\n", 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; return 0;
err_out_unregister_clk_notifier: err_out_clk_dis_phy:
clk_disable_unprepare(lp->phy_ref_clk); clk_disable_unprepare(lp->phy_ref_clk);
err_out_unregister_netdev:
unregister_netdev(ndev);
err_out_clk_dis_aper: err_out_clk_dis_aper:
clk_disable_unprepare(lp->apb_pclk); clk_disable_unprepare(lp->apb_pclk);
err_out_free_netdev: err_out_free_netdev: