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stmmac: dwmac-loongson: Make sure MDIO is initialized before use

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[ Upstream commit e87d3a1370 ]

Generic code will use mdio. If it is not initialized before use,
the kernel will Oops.

Fixes: 30bba69d7d ("stmmac: pci: Add dwmac support for Loongson")
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Signed-off-by: Feiyang Chen <chenfeiyang@loongson.cn>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yanteng Si 2023-12-11 18:33:11 +08:00 committed by Greg Kroah-Hartman
parent 63387fe87f
commit 918991db7d
1 changed files with 6 additions and 8 deletions
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14
drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
View file

@ -68,17 +68,15 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id
if (!plat)
return -ENOMEM;
plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
sizeof(*plat->mdio_bus_data),
GFP_KERNEL);
if (!plat->mdio_bus_data)
return -ENOMEM;
plat->mdio_node = of_get_child_by_name(np, "mdio");
if (plat->mdio_node) {
dev_info(&pdev->dev, "Found MDIO subnode\n");
plat->mdio_bus_data = devm_kzalloc(&pdev->dev,
sizeof(*plat->mdio_bus_data),
GFP_KERNEL);
if (!plat->mdio_bus_data) {
ret = -ENOMEM;
goto err_put_node;
}
plat->mdio_bus_data->needs_reset = true;
}