[PATCH] bond_main.c: fix device deregistration in init exception path

[Florin Malita <fmalita@gmail.com>]

bond_init() is not releasing rtnl_sem after register_netdevice() and
before calling unregister_netdevice() (from bond_free_all()) in the
exception path. As the device registration is not completed
(dev->reg_state == NETREG_REGISTERING), the call to
unregister_netdevice() triggers BUG_ON(dev->reg_state != NETREG_REGISTERED).

Signed-off-by: Florin Malita <fmalita@gmail.com>
----
diff --git a/drivers/net/bonding/bond_main.c
b/drivers/net/bonding/bond_main.c
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -5039,6 +5039,10 @@ static int __init bonding_init(void)
        return 0;

 out_err:
+       /* give register_netdevice() a chance to complete */
+       rtnl_unlock();
+       rtnl_lock();
+
        /* free and unregister all bonds that were successfully added */
        bond_free_all();