Re: [PATCH 2.6.21-rc1] ibmebus: Support dynamic addition and removal ofadapters

From: Joachim Fenkes
Date: Tue Feb 20 2007 - 17:36:48 EST

John Rose <johnrose@xxxxxxxxxxxxxx> wrote on 20.02.2007 12:25:06:

> > If the probe operation succeeds, the respective device will show up
> > beneath
> > /sys/bus/ibmebus/devices.
> This approach is not particularly synchronous. Take the case of an add
> failure: how long would an application wait before deciding that the new
> device is not going to appear?
> It might be preferable to have the write to the probe function fail.
> For example, if we can't find the device node, return -EINVAL or
> something.

Can be done, sure. Just a matter of putting some more sophisticated error
handling into my code. Patch follows in a bit.

> > This is already taken care of by of_device_register().
> If we are scrapping the use of of_device for ibmebus devices, can we
> still create a devspec file for OF correlation purposes?

We don't. My recent patch only changes the fake root device.
Ibmebus-based devices will still be of_devices, of course.


Joachim Fenkes -- eHCA Linux Driver Developer and Hardware Tamer
IBM Deutschland Entwicklung GmbH -- Dept. 3627 (I/O Firmware Dev. 2)
Schoenaicher Strasse 220 -- 71032 Boeblingen -- Germany
eMail: fenkes@xxxxxxxxxx -- Phone: +49 7031 16 1239

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