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[ Upstream commit2ae34111fe] In current code "plat->mdio_node" is always NULL, the mdio support is lost as there is no "mdio_bus_data". The original driver could work as the "mdio" variable is never set to false, which is described in commit <b0e03950dd71> ("stmmac: dwmac-loongson: fix uninitialized variable ......"). And after this commit merged, the "mdio" variable is always false, causing the mdio supoort logic lost. Fixes:30bba69d7d("stmmac: pci: Add dwmac support for Loongson") Signed-off-by: Liu Peibao <liupeibao@loongson.cn> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://lore.kernel.org/r/20221101060218.16453-1-liupeibao@loongson.cn Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>