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Date:   Wed, 16 Sep 2020 23:33:21 -0700
From:   Francesco Ruggeri <>
To:     open list <>,
        netdev <>,,,,
        Eric Dumazet <>,,, Jakub Kicinski <>,
        David Miller <>,
        Francesco Ruggeri <>
Subject: Re: [PATCH] net: make netdev_wait_allrefs wake-able

>  static inline void dev_put(struct net_device *dev)
>  {
> +       struct task_struct *destroy_task = dev->destroy_task;
> +
>         this_cpu_dec(*dev->pcpu_refcnt);
> +       if (destroy_task)
> +               wake_up_process(destroy_task);
>  }

I just realized that this introduces a race, if dev_put drops the last
reference, an already running netdev_wait_allrefs runs to completion
and then dev_put tries to wake it up.
Any suggestions on how to avoid this without resorting to


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