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1 parent d215ab4 commit 10ad63dCopy full SHA for 10ad63d
drivers/net/mdio/mdio-mux.c
@@ -214,8 +214,10 @@ int mdio_mux_init(struct device *dev,
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snprintf(cb->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x.%x",
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cb->mii_bus->name, pb->parent_id, v);
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cb->mii_bus->parent = dev;
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- cb->mii_bus->read = mdio_mux_read;
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- cb->mii_bus->write = mdio_mux_write;
+ if (parent_bus->read)
+ cb->mii_bus->read = mdio_mux_read;
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+ if (parent_bus->write)
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+ cb->mii_bus->write = mdio_mux_write;
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if (parent_bus->read_c45)
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cb->mii_bus->read_c45 = mdio_mux_read_c45;
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if (parent_bus->write_c45)
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