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Diffstat (limited to 'net/dsa/dsa.c')
-rw-r--r--net/dsa/dsa.c41
1 files changed, 34 insertions, 7 deletions
diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 76e3800765f8..c59fa5d9c22c 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -634,6 +634,10 @@ static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
port_index++;
}
kfree(pd->chip[i].rtable);
+
+ /* Drop our reference to the MDIO bus device */
+ if (pd->chip[i].host_dev)
+ put_device(pd->chip[i].host_dev);
}
kfree(pd->chip);
}
@@ -661,16 +665,22 @@ static int dsa_of_probe(struct device *dev)
return -EPROBE_DEFER;
ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
- if (!ethernet)
- return -EINVAL;
+ if (!ethernet) {
+ ret = -EINVAL;
+ goto out_put_mdio;
+ }
ethernet_dev = of_find_net_device_by_node(ethernet);
- if (!ethernet_dev)
- return -EPROBE_DEFER;
+ if (!ethernet_dev) {
+ ret = -EPROBE_DEFER;
+ goto out_put_mdio;
+ }
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
- if (!pd)
- return -ENOMEM;
+ if (!pd) {
+ ret = -ENOMEM;
+ goto out_put_ethernet;
+ }
dev->platform_data = pd;
pd->of_netdev = ethernet_dev;
@@ -691,7 +701,9 @@ static int dsa_of_probe(struct device *dev)
cd = &pd->chip[chip_index];
cd->of_node = child;
- cd->host_dev = &mdio_bus->dev;
+
+ /* When assigning the host device, increment its refcount */
+ cd->host_dev = get_device(&mdio_bus->dev);
sw_addr = of_get_property(child, "reg", NULL);
if (!sw_addr)
@@ -711,6 +723,12 @@ static int dsa_of_probe(struct device *dev)
ret = -EPROBE_DEFER;
goto out_free_chip;
}
+
+ /* Drop the mdio_bus device ref, replacing the host
+ * device with the mdio_bus_switch device, keeping
+ * the refcount from of_mdio_find_bus() above.
+ */
+ put_device(cd->host_dev);
cd->host_dev = &mdio_bus_switch->dev;
}
@@ -744,6 +762,10 @@ static int dsa_of_probe(struct device *dev)
}
}
+ /* The individual chips hold their own refcount on the mdio bus,
+ * so drop ours */
+ put_device(&mdio_bus->dev);
+
return 0;
out_free_chip:
@@ -751,6 +773,10 @@ out_free_chip:
out_free:
kfree(pd);
dev->platform_data = NULL;
+out_put_ethernet:
+ put_device(&ethernet_dev->dev);
+out_put_mdio:
+ put_device(&mdio_bus->dev);
return ret;
}
@@ -762,6 +788,7 @@ static void dsa_of_remove(struct device *dev)
return;
dsa_of_free_platform_data(pd);
+ put_device(&pd->of_netdev->dev);
kfree(pd);
}
#else