netdev - Re: [RFC][PATCH] Fix another namespace issue with devices assigned to classes

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Message-ID: <AANLkTilUd2Bp1h4SzlW5f5KevoRM-os_fQrivLHbZyKY@mail.gmail.com>
Date:	Tue, 8 Jun 2010 18:39:28 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg KH <greg@...ah.com>, netdev <netdev@...r.kernel.org>
Subject: Re: [RFC][PATCH] Fix another namespace issue with devices assigned to 
	classes

On Tue, Jun 8, 2010 at 18:33, Johannes Berg <johannes@...solutions.net> wrote:
> On Tue, 2010-06-08 at 18:26 +0200, Kay Sievers wrote:
>
>> >> To fix the hwsim driver core interaction, core changes will probably
>> >> be needed to allow network modules to be removed while their devices
>> >> are active. That's something which seems not to work for bus devices
>> >> currently.
>> >
>> > Well it just needs to pin the module refcount from the bus and/or device
>> > struct. That seems not too hard?
>>
>> How? If we ever get a reference of the module, it will not be able to
>> be unloaded while stuff is active, right?
>
> Hmm, true, but how does this work with class devices it has now? It
> seems to work fine now. It's because we have a generic release function
> there I guess?

Because the code to cleanup is always built into the core, yes. Even
the empty release function thing we can not do. :)

That all works if you have two modules, like almost all buses have.
That's what I meant, that we need to add stuff to the core to be able
to cleanup bus devices internally too, if we use everything in a
single module, which is also supposed to cleanup on unload, like the
network devices like to do.

Kay
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