mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and...

[karo-tx-linux.git] / drivers / net / phy / mdio-mux.c

diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
index 4d4d25efc1e10a2b87e3c8ab993ae3ba6167a7dd..280c7c311f72442c4877815ece73c2a36745be49 100644 (file)
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -113,18 +113,18 @@ int mdio_mux_init(struct device *dev,
        if (!parent_bus_node)
                return -ENODEV;
 
-       parent_bus = of_mdio_find_bus(parent_bus_node);
-       if (parent_bus == NULL) {
-               ret_val = -EPROBE_DEFER;
-               goto err_parent_bus;
-       }
-
        pb = devm_kzalloc(dev, sizeof(*pb), GFP_KERNEL);
        if (pb == NULL) {
                ret_val = -ENOMEM;
                goto err_parent_bus;
        }
 
+       parent_bus = of_mdio_find_bus(parent_bus_node);
+       if (parent_bus == NULL) {
+               ret_val = -EPROBE_DEFER;
+               goto err_parent_bus;
+       }
+
        pb->switch_data = data;
        pb->switch_fn = switch_fn;
        pb->current_child = -1;
@@ -173,6 +173,10 @@ int mdio_mux_init(struct device *dev,
                dev_info(dev, "Version " DRV_VERSION "\n");
                return 0;
        }
+
+       /* balance the reference of_mdio_find_bus() took */
+       put_device(&pb->mii_bus->dev);
+
 err_parent_bus:
        of_node_put(parent_bus_node);
        return ret_val;
@@ -189,6 +193,9 @@ void mdio_mux_uninit(void *mux_handle)
                mdiobus_free(cb->mii_bus);
                cb = cb->next;
        }
+
+       /* balance the reference of_mdio_find_bus() in mdio_mux_init() took */
+       put_device(&pb->mii_bus->dev);
 }
 EXPORT_SYMBOL_GPL(mdio_mux_uninit);