[PATCH 04/30] staging/vme: allow non-dynamic allocation of bus numbers
Emilio G. Cota
cota at braap.org
Wed Nov 3 20:40:56 PDT 2010
On Wed, Oct 27, 2010 at 11:13:27 -0400, Emilio G. Cota wrote:
> On Wed, Oct 27, 2010 at 10:41:18 +0100, Martyn Welch wrote:
> > On 26/10/10 02:10, Emilio G. Cota wrote:
> > > From: Emilio G. Cota <cota at braap.org>
> > >
> > > In a configuration with several bridges, each bridge is
> > > assigned a certain bus number depending on the order in which
> > > vme_register_bridge is called. This can complicate multi-bridge
> > > installations because the eventual bus numbers will depend
> > > on the order the bridges were loaded.
> > >
> > > The appended allows bridges to register with a bus number of
> > > their choice, while keeping the previous 'first come, first
> > > served' behaviour as the default.
> > >
> > I can't see where this is being used.
> Each driver's .probe is fed with bus_number and slot_number.
> Normally the driver will check that pair against what it received
> through modparams and act accordingly.
> For this to be reliable bus numbering should be consistent on
> a given system, i.e. it should be possible to always allocate
> the same bus number to a given bus. Otherwise, depending on
> which bridge is installed first, we'd get different bus numbers
> Does that make it clearer now?
> > I assume this is a part of future changes you wish to make?
> AFAICT it affects the current model.
Have you had time to re-check this one?
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