From: Jiri Pirko <j...@resnulli.us>
Date: Wed, 27 Jan 2016 15:16:43 +0100
> From: Ido Schimmel <ido...@mellanox.com>
>
> When switchdev drivers process FDB notifications from the underlying
> device they resolve the netdev to which the entry points to and notify
> the bridge using the switchdev notifier.
>
> However, since the RTNL mutex is not held there is nothing preventing
> the netdev from disappearing in the middle, which will cause
> br_switchdev_event() to dereference a non-existing netdev.
>
> Make switchdev drivers hold the lock at the beginning of the
> notification processing session and release it once it ends, after
> notifying the bridge.
>
> Also, remove switchdev_mutex and fdb_lock, as they are no longer needed
> when RTNL mutex is held.
>
> Fixes: 03bf0c281234 ("switchdev: introduce switchdev notifier")
> Signed-off-by: Ido Schimmel <ido...@mellanox.com>
> Signed-off-by: Jiri Pirko <j...@mellanox.com>
Applied and queued up for -stable, thanks Jiri.
