lkml.org 
[lkml]   [2010]   [Oct]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 04/30] staging/vme: allow non-dynamic allocation of bus numbers
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@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
assigned.

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.

Cheers

Emilio



\
 
 \ /
  Last update: 2010-10-27 17:17    [W:0.087 / U:9.440 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site