netiucv: Hold rtnl between name allocation and device registration.
fixes a race condition between concurrent initializations of netiucv devices
that try to use the same name.
sysfs: cannot create duplicate filename '/devices/iucv/netiucv2'
[...]
Call Trace:
([<00000000002edea4>] sysfs_add_one+0xb0/0xdc)
[<00000000002eecd4>] create_dir+0x80/0xfc
[<00000000002eee38>] sysfs_create_dir+0xe8/0x118
[<00000000003835a8>] kobject_add_internal+0x120/0x2d0
[<00000000003839d6>] kobject_add+0x62/0x9c
[<00000000003d9564>] device_add+0xcc/0x510
[<000003e00212c7b4>] netiucv_register_device+0xc0/0x1ec [netiucv]
Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
Tested-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/s390/net/netiucv.c b/drivers/s390/net/netiucv.c
index 4ffa66c..9ca3996 100644
--- a/drivers/s390/net/netiucv.c
+++ b/drivers/s390/net/netiucv.c
@@ -2040,6 +2040,7 @@
netiucv_setup_netdevice);
if (!dev)
return NULL;
+ rtnl_lock();
if (dev_alloc_name(dev, dev->name) < 0)
goto out_netdev;
@@ -2061,6 +2062,7 @@
out_fsm:
kfree_fsm(privptr->fsm);
out_netdev:
+ rtnl_unlock();
free_netdev(dev);
return NULL;
}
@@ -2100,6 +2102,7 @@
rc = netiucv_register_device(dev);
if (rc) {
+ rtnl_unlock();
IUCV_DBF_TEXT_(setup, 2,
"ret %d from netiucv_register_device\n", rc);
goto out_free_ndev;
@@ -2109,7 +2112,8 @@
priv = netdev_priv(dev);
SET_NETDEV_DEV(dev, priv->dev);
- rc = register_netdev(dev);
+ rc = register_netdevice(dev);
+ rtnl_unlock();
if (rc)
goto out_unreg;