Messages in this thread | | | From | Dmitry Torokhov <> | Subject | Re: [patch] Declare explicit, hardware based lock ranking in serio | Date | Sat, 3 Jun 2006 07:56:39 -0400 |
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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
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