stmmac: dwmac-loongson: fix missing of_node_put() while module exiting

The node returned by of_get_child_by_name() with refcount decremented,
of_node_put() needs be called when finish using it. So add it in the
error path in loongson_dwmac_probe() and in loongson_dwmac_remove().

Fixes: 2ae34111fe4e ("stmmac: dwmac-loongson: fix invalid mdio_node")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
index 2d480bc..a25c187 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
@@ -75,20 +75,24 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id
                plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
                                                   sizeof(*plat->mdio_bus_data),
                                                   GFP_KERNEL);
-               if (!plat->mdio_bus_data)
-                       return -ENOMEM;
+               if (!plat->mdio_bus_data) {
+                       ret = -ENOMEM;
+                       goto err_put_node;
+               }
                plat->mdio_bus_data->needs_reset = true;
        }
 
        plat->dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*plat->dma_cfg), GFP_KERNEL);
-       if (!plat->dma_cfg)
-               return -ENOMEM;
+       if (!plat->dma_cfg) {
+               ret = -ENOMEM;
+               goto err_put_node;
+       }
 
        /* Enable pci device */
        ret = pci_enable_device(pdev);
        if (ret) {
                dev_err(&pdev->dev, "%s: ERROR: failed to enable device\n", __func__);
-               return ret;
+               goto err_put_node;
        }
 
        /* Get the base address of device */
@@ -152,13 +156,18 @@ err_disable_msi:
        pci_disable_msi(pdev);
 err_disable_device:
        pci_disable_device(pdev);
+err_put_node:
+       of_node_put(plat->mdio_node);
        return ret;
 }
 
 static void loongson_dwmac_remove(struct pci_dev *pdev)
 {
+       struct net_device *ndev = dev_get_drvdata(&pdev->dev);
+       struct stmmac_priv *priv = netdev_priv(ndev);
        int i;
 
+       of_node_put(priv->plat->mdio_node);
        stmmac_dvr_remove(&pdev->dev);
 
        for (i = 0; i < PCI_STD_NUM_BARS; i++) {