[BOND]: Fix bond_init() error path handling.

From: 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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index f8dedb623dc0..90449a0f2a6c 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -5039,6 +5039,14 @@ static int __init bonding_init(void)
         return 0;
 
 out_err:
+        /*
+         * rtnl_unlock() will run netdev_run_todo(), putting the
+         * thus-far-registered bonding devices into a state which
+         * unregigister_netdevice() will accept
+         */
+        rtnl_unlock();
+        rtnl_lock();
+
         /* free and unregister all bonds that were successfully added */
         bond_free_all();