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>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/s390/net/netiucv.c b/drivers/s390/net/netiucv.c
index 4ffa66c87ea5..9ca3996f65b2 100644
--- a/drivers/s390/net/netiucv.c
+++ b/drivers/s390/net/netiucv.c
@@ -2040,6 +2040,7 @@ static struct net_device *netiucv_init_netdevice(char *username, char *userdata)
                            netiucv_setup_netdevice);
         if (!dev)
                 return NULL;
+        rtnl_lock();
         if (dev_alloc_name(dev, dev->name) < 0)
                 goto out_netdev;
 
@@ -2061,6 +2062,7 @@ static struct net_device *netiucv_init_netdevice(char *username, char *userdata)
 out_fsm:
         kfree_fsm(privptr->fsm);
 out_netdev:
+        rtnl_unlock();
         free_netdev(dev);
         return NULL;
 }
@@ -2100,6 +2102,7 @@ static ssize_t conn_write(struct device_driver *drv,
 
         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 @@ static ssize_t conn_write(struct device_driver *drv,
         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;