Re: hotpluggable ide cd-rom drive?

[Oliver Neukum <oliver@neukum.name>]

Am Montag, 17. März 2003 20:09 schrieb Greg KH:
> On Mon, Mar 17, 2003 at 08:05:21PM +0100, Oliver Neukum wrote:
> > Am Montag, 17. März 2003 18:50 schrieb Greg KH:
> > > On Mon, Mar 17, 2003 at 06:56:28AM -0600, Kari Karhi wrote:
> > > > Is there a user level command to kick the ide-probe module into
> > > > probing the ide bus again?  Or is work going on to get the kernel to
> > > > support hot-pluggable ide drives?  Or am I just missing some
> > > > configuration parameter?
> > >
> > > Unfortunately this is usually done in a hardware specific way, and
> > > since neither Dell, nor any other laptop manufacturer has provided the
> > > specs for how to detect and do this kind of hot-swap, Linux does not
> > > support it.
> >
> > Not entirely true. It's supported in Apple Powerbooks.
>
> Oh, forgot, some laptops support this if you suspend to ram, swap out
> the drive, and then resume.  Works for some APM based laptops, don't
> know about ACPI based ones.

Powerbooks do it on a live system. Look at drivers/macintosh/mediabay.c.

> > What happens if we suspend to disk and wake up with a changed drive ?
>
> Heh, I don't want to think about that :)

Let me guess, you have an aversion against horror movies? ;-)

Seriously, looking power.c::device_resume()  the code assumes that resumption
is always successful. That is bad. Error codes need to be returned and 
evaluated.

	Regards
		Oliver



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