linux-kernel - Re: [PATCH] libata: Register for dock events when the drive is inside a dock station

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Message-ID: <20080228110927.GA5745@homac.suse.de>
Date:	Thu, 28 Feb 2008 12:09:27 +0100
From:	Holger Macht <hmacht@...e.de>
To:	Tejun Heo <htejun@...il.com>
Cc:	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
Subject: Re: [PATCH] libata: Register for dock events when the drive is
	inside a dock station

On Thu 28. Feb - 18:35:06, Tejun Heo wrote:
> Holger Macht wrote:
> > The hotplug handler is only called if the device is actually inside the
> > dock station. If it is not, nothing will happen. I hope that I got your
> > question right?
> 
> Yes, right.
> 
> > However, if this would be helpful, it would be easy to add something like
> > a am_I_on_dock_station?(...) function to the dock driver.
> 
> Hmm.. as long as the event is only delivered when the device is actually
> connected behind dock, I think it's okay.

The dock driver also export a is_dock_device(acpi_handle) function, which
could be used to make more fine-grained decisions, but it shouldn't be
needed here.

> Does the attached patch fix the previous undock problem?  It now
> explicitly tells libata EH to detach the notified devices on
> EJECT_REQUEST and wait for EH to complete such that control is returned
> to ACPI after all notified devices are actually detached.

No it does not. Apparently, it freezes faster (from 1 second down to
immediately). Before, it just froze when someone (in this case HAL) tried
to access the device. The "echo 1 > undock" call does not even return, so
it might have introduced another problem.

Regards,
	Holger
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