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From: Adrian Chadd <adr...@freebsd.org>
Newsgroups: fa.freebsd.hackers
Subject: Re: VIMAGE crashes on 9.x with hotplug net80211 devices
Date: Mon, 22 Oct 2012 14:13:15 UTC
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To: Marko Zec <z...@fer.hr>
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On 22 October 2012 03:08, Marko Zec <z...@fer.hr> wrote:

> The only option I can think of now is to update all of the hotunpluggable
> device_detach() handlers to do CURVNET_SET(ifp->if_vnet) before calling
> further down into the networking stack, because as you already observed,
> whatever triggers a device_detach() handler is not aware of the nature of
> the driver.

Right. Well, since most things are in theory hotpluggable these days
(or soon will be, with pcie hotplug), I think we need a slightly more
generic solution.

>> (how the hell does this work for devices attached at probe time? What
>> vnet context do they have, and why doesn't the kernel panic there?)
>
> Because at boot / autoconfiguration time curvnet is implicitly set to vnet0
> between SI_SUB_VNET and SI_SUB_VNET_DONE (i.e. before going SMP).
>
> Similarly, curvnet is set to vnet0 during kldload events.

. like this.

The trouble is going to be handling unplug and kldunload events too.
Does curvnet -> vnet0 during kldunload events?

Thanks,



Adrian
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