linux-kernel - Re: [PATCH 2.6.21-rc1] ibmebus: Support dynamic addition and removal of adapters

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Message-ID: <OF11FDFA50.7BF76A97-ON85257288.006AC46B-85257288.007C2AD7@de.ibm.com>
Date:	Tue, 20 Feb 2007 17:36:16 -0500
From:	Joachim Fenkes <FENKES@...ibm.com>
To:	John Rose <johnrose@...tin.ibm.com>
Cc:	Hoang-Nam Nguyen <hnguyen@...ux.vnet.ibm.com>,
	Me Notes <johnrose@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	External List <linuxppc-dev@...abs.org>,
	Paul Mackerras <paulus@...ba.org>,
	Paul Mackerras <pmac@....ibm.com>
Subject: Re: [PATCH 2.6.21-rc1] ibmebus: Support dynamic addition	and	removal of
 adapters

John Rose <johnrose@...tin.ibm.com> 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.

Regards,
  Joachim

---
Joachim Fenkes  --  eHCA Linux Driver Developer and Hardware Tamer
IBM Deutschland Entwicklung GmbH  --  Dept. 3627 (I/O Firmware Dev. 2)
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eMail: fenkes@...ibm.com  --  Phone: +49 7031 16 1239 

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