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Date:   Tue, 03 Aug 2021 11:59:34 +0200
From:   "Hannes Frederic Sowa" <>
To:     "Kefeng Wang" <>,,
Cc:     "Daniel Borkmann" <>,
        "David Miller" <>,
        "Eric Dumazet" <>,
        "Minmin chen" <>,
        "Jakub Kicinski" <>,
        "Greg Kroah-Hartman" <>,
        "Andrew Morton" <>
Subject: Re: [PATCH] once: Fix panic when module unload


On Tue, Aug 3, 2021, at 04:11, Kefeng Wang wrote:
> Hi ALL, I don't know who maintain the lib/once.c, add Greg and Andrew too,
> Hi David, I check the history, the lib/once.c is from net/core/utils.c 
> since
> commit 46234253b9363894a254844a6550b4cc5f3edfe8
> Author: Hannes Frederic Sowa <>
> Date:   Thu Oct 8 01:20:35 2015 +0200
>      net: move net_get_random_once to lib
> This bug is found in our product test, we want to make sure that whether 
> this solution
> is correct or not, so could David or any others help to review this patch.
> Many thinks.

Thanks for the patch.

I see that it got marked as not applicable for the net trees:

Back then I added this code via the net/ tree thus I think it should get
picked up nonetheless hopefully.

Regarding your patch, I think it mostly looks fine:

It might be worthwhile to increment the reference counter inside the
preempt disabled bracket in find_module_by_key (and thus also rename
that function to make this fact more clear).

The other option would be to use the macro DO_ONCE and always pass in
THIS_MODULE from there, increment its ref counter in once_disable_jump.
This might be more canonical.

Thanks and sorry for the delay,

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