From: Eric Dumazet <eric.duma...@gmail.com>
Date: Thu, 02 Feb 2017 10:31:35 -0800
> From: Eric Dumazet <eduma...@google.com>
>
> Dmitry reported a warning [1] showing that we were calling
> net_disable_timestamp() -> static_key_slow_dec() from a non
> process context.
>
> Grabbing a mutex while holding a spinlock or rcu_read_lock()
> is not allowed.
>
> As Cong suggested, we now use a work queue.
>
> It is possible netstamp_clear() exits while netstamp_needed_deferred
> is not zero, but it is probably not worth trying to do better than that.
>
> netstamp_needed_deferred atomic tracks the exact number of deferred
> decrements.
...
> Fixes: b90e5794c5bd ("net: dont call jump_label_dec from irq context")
> Suggested-by: Cong Wang <xiyou.wangc...@gmail.com>
> Reported-by: Dmitry Vyukov <dvyu...@google.com>
> Signed-off-by: Eric Dumazet <eduma...@google.com>
Applied and queued up for -stable, thanks Eric.
