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SubjectRe: [patch] Declare explicit, hardware based lock ranking in serio
Date
On Saturday 03 June 2006 04:50, Arjan van de Ven wrote:
> > Thanks.
> >
> > So we're taking ps2->cmd_mutex and then we're recurring back into
> > ps2_command() and then taking ps2->serio->cmd_mutex.
> >
> > I suspect that's all correct/natural/expected and needs another
> > make-lockdep-shut-up patch.
>
>
> The PS/2 code has a natural device order and there is a one level
> recursion in this device order in terms of the cmd_mutex; annotate
> this explicit recursion as ok
>

It is not necessarily single depth - one could have 2 or more pass-through
ports chained together, although currently in kernel we only have Synaptics
pass-through. If we were ever to implement pass-through port for IBMs
trackpoints then we'd have:

Synaptics<->pass-through<->TP<->pass-through<->some mouse

--
Dmitry
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