linux-kernel - Re: Please revert 5adc55da4a7758021bcc374904b0f8b076508a11 (PCI_MULTITHREAD

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Date:	Wed, 9 May 2007 11:52:59 -0700 (PDT)
From:	david@...g.hm
To:	Cornelia Huck <cornelia.huck@...ibm.com>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>, Greg K-H <greg@...ah.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Duncan Sands <duncan.sands@...h.u-psud.fr>
Subject: Re: Please revert 5adc55da4a7758021bcc374904b0f8b076508a11
 (PCI_MULTITHREAD_PROBE)

On Wed, 9 May 2007, Cornelia Huck wrote:

> On Wed, 9 May 2007 10:53:52 -0700 (PDT),
> david@...g.hm wrote:
>
>> if you want the registration to use hotplug and be async then do do the
>> registration during step 2 and make step 4 be a noop, in fact some drivers
>> may do all their work in step 2, while others (everything currently) will
>> do all their work during step 1
>
> The added benefit of setup() I was thinking of was being able to
> enable/disable devices later on (where enable entails the "heavy
> lifting").
>
> Say you have a range of devices you only use seldomly for some special
> purpose. They may take a long time to get up and use a lot of resources
> when they're on. You don't want to slow the boot process down for them,
> so they start disabled with just very basic setup (the fast stuff)
> done. (It is also useful if you want some manual configuration between
> the fast stuff and the heavy lifting.) When you need them, you spin
> them up (may take some time) and then use them. Afterwards, you could
> spin them down again. (This is what the ccw/ccwgroup/ap bus online
> attribute does today.)

this sounds like something that you want to load the driver module for 
when you want to use it and unload the driver module when you are done.

if you want to make a seperate enable/disable function I think it would 
probably be more appropriate to use the power management functions.

David Lang
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