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From: Paul Mackerras <paulus@au1.ibm.com>
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Message-ID: <15907.30411.916585.622130@argo.ozlabs.ibm.com>
Date: Tue, 14 Jan 2003 13:32:43 +1100
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       benh@kernel.crashing.org
Subject: ide-cs problem (was Re: any chance of 2.6.0-test*?)
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Alan Cox writes:

> The ide release code isnt safe in any context.

Do you mean ide_release in ide-cs.c, or ide_unregister in ide.c?

> The code is currently written on the basis that people don't mangle
> free interfaces (the free up code restores stuff which I grant is

Well, the problem is that there is no way to say that there is a hwif
present without any drives.  The low-level driver (i.e. pmac.c) has to
leave hwif->present = 0, because if you set hwif->present = 1 then the
ide probe code won't go looking for drives.  The probe code then only
sets hwif->present = 1 if it finds a drive.  If hwif->present gets
left at 0 then it is liable to be taken over for a pcmcia card.

What would be good is a way to say "I know this hwif is definitely
present, please probe for devices attached to it, but don't decide
it's not present if you don't find any devices".  I would like pmac.c
to be able to set hwif->present = 1 but still have the probe code go
looking for devices.

Regards,
Paul.
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