netdev - Re: [PATCH net v2] net: avoid registering new queue objects after device unregistration

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Date:   Mon, 22 Nov 2021 17:56:06 +0100
From:   Antoine Tenart <atenart@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     davem@...emloft.net, alexander.duyck@...il.com,
        netdev@...r.kernel.org, Michal Kubecek <mkubecek@...e.cz>
Subject: Re: [PATCH net v2] net: avoid registering new queue objects after device unregistration

Quoting Jakub Kicinski (2021-11-22 17:31:44)
> On Mon, 22 Nov 2021 17:20:07 +0100 Antoine Tenart wrote:
> >    veth_set_channels+0x1c3/0x550
> >    ethnl_set_channels+0x524/0x610
> 
> The patch looks fine, but ethtool calls should not happen after
> unregister IMHO. Too many drivers would be surprised. 
> 
> Maybe we should catch unregistered devices in ethnl_ops_begin()?

That might be good to have indeed, I'll have a look. I'm not sure about
other paths that could do the same: if there are, we might want to keep
the check in this patch as well. Or WARN to catch future misuses?

Thanks!
Antoine