From: Vlad Buslov <vla...@mellanox.com>
Date: Tue, 14 Aug 2018 21:46:16 +0300
> Recently, ops->init() and ops->dump() of all actions were modified to
> always obtain tcf_lock when accessing private action state. Actions that
> don't depend on tcf_lock for synchronization with their data path use
> non-bh locking API. However, tcf_lock is also used to protect rate
> estimator stats in softirq context by timer callback.
>
> Change ops->init() and ops->dump() of all actions to disable bh when using
> tcf_lock to prevent deadlock reported by following lockdep warning:
...
> Taking tcf_lock in sample action with bh disabled causes lockdep to issue a
> warning regarding possible irq lock inversion dependency between tcf_lock,
> and psample_groups_lock that is taken when holding tcf_lock in sample init:
...
> In order to prevent potential lock inversion dependency between tcf_lock
> and psample_groups_lock, extract call to psample_group_get() from tcf_lock
> protected section in sample action init function.
>
> Fixes: 4e232818bd32 ("net: sched: act_mirred: remove dependency on rtnl lock")
> Fixes: 764e9a24480f ("net: sched: act_vlan: remove dependency on rtnl lock")
> Fixes: 729e01260989 ("net: sched: act_tunnel_key: remove dependency on rtnl
> lock")
> Fixes: d77284956656 ("net: sched: act_sample: remove dependency on rtnl lock")
> Fixes: e8917f437006 ("net: sched: act_gact: remove dependency on rtnl lock")
> Fixes: b6a2b971c0b0 ("net: sched: act_csum: remove dependency on rtnl lock")
> Fixes: 2142236b4584 ("net: sched: act_bpf: remove dependency on rtnl lock")
> Signed-off-by: Vlad Buslov <vla...@mellanox.com>
Applied, thanks Vlad.
