netdev - Re: [PATCH net-next v7 1/8] bnxt_en: Add auxiliary driver support

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Date:   Mon, 16 Jan 2023 20:56:25 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Leon Romanovsky <leonro@...dia.com>
Cc:     Ajit Khaparde <ajit.khaparde@...adcom.com>,
        andrew.gospodarek@...adcom.com, davem@...emloft.net,
        edumazet@...gle.com, jgg@...pe.ca, leon@...nel.org,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        michael.chan@...adcom.com, netdev@...r.kernel.org,
        pabeni@...hat.com, selvin.xavier@...adcom.com
Subject: Re: [PATCH net-next v7 1/8] bnxt_en: Add auxiliary driver support

On Sat, 14 Jan 2023 12:39:09 -0800 Ajit Khaparde wrote:
> > > +static void bnxt_aux_dev_release(struct device *dev)
> > > +{
> > > +     struct bnxt_aux_dev *bnxt_adev =
> > > +             container_of(dev, struct bnxt_aux_dev, aux_dev.dev);
> > > +     struct bnxt *bp = netdev_priv(bnxt_adev->edev->net);
> > > +
> > > +     bnxt_adev->edev->en_ops = NULL;
> > > +     kfree(bnxt_adev->edev);  
> >
> > And yet the reference counted "release" function accesses the bp->adev
> > like it must exist.
> >
> > This seems odd to me - why do we need refcounting on devices at all
> > if we can free them synchronously? To be clear - I'm not sure this is
> > wrong, just seems odd.  
> I followed the existing implementations in that regard. Thanks

Leon, could you take a look? Is there no problem in assuming bnxt_adev
is still around in the release function?