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From: Michal Schmidt <mschmidt@redhat.com>
To: intel-wired-lan@osuosl.org
Subject: [Intel-wired-lan] [PATCH net] ice: Fix race during aux device (un)plugging
Date: Fri, 15 Apr 2022 13:12:03 +0200	[thread overview]
Message-ID: <CADEbmW3eUAnvn4gvNxqjCMmO333-=OdObGhDXkrTbDwn0YkJDw@mail.gmail.com> (raw)
In-Reply-To: <20220414163907.1456925-1-ivecera@redhat.com>

On Thu, Apr 14, 2022 at 6:39 PM Ivan Vecera <ivecera@redhat.com> wrote:

> Function ice_plug_aux_dev() assigns pf->adev field too early prior
> aux device initialization and on other side ice_unplug_aux_dev()
> starts aux device deinit and at the end assigns NULL to pf->adev.
> This is wrong and can causes a crash when ice_send_event_to_aux()
> call occurs during these operations because that function depends
> on non-NULL value of pf->adev and does not assume that aux device
> is half-initialized or half-destroyed.
>
> Modify affected functions so pf->adev field is set after aux device
> init and prior aux device destroy.
>
[...]

> @@ -320,12 +319,14 @@ int ice_plug_aux_dev(struct ice_pf *pf)
>   */
>  void ice_unplug_aux_dev(struct ice_pf *pf)
>  {
> -       if (!pf->adev)
> +       struct auxiliary_device *adev = pf->adev;
> +
> +       if (!adev)
>                 return;
>
> -       auxiliary_device_delete(pf->adev);
> -       auxiliary_device_uninit(pf->adev);
>         pf->adev = NULL;
> +       auxiliary_device_delete(adev);
> +       auxiliary_device_uninit(adev);
>  }
>

Hi Ivan,
What prevents ice_unplug_aux_dev() from running immediately after
ice_send_event_to_aux() gets past its "if (!pf->adev)" test ?
Michal
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  reply	other threads:[~2022-04-15 11:12 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-14 16:39 [PATCH net] ice: Fix race during aux device (un)plugging Ivan Vecera
2022-04-14 16:39 ` [Intel-wired-lan] " Ivan Vecera
2022-04-15 11:12 ` Michal Schmidt [this message]
2022-04-15 15:49   ` Ivan Vecera
2022-04-15 15:49     ` [Intel-wired-lan] " Ivan Vecera
2022-04-15 17:53     ` Ertman, David M
2022-04-15 17:53       ` [Intel-wired-lan] " Ertman, David M
2022-04-20  6:36     ` Leon Romanovsky
2022-04-20  6:36       ` [Intel-wired-lan] " Leon Romanovsky
2022-04-20 13:59       ` Ivan Vecera

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