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

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Date:	Thu, 28 Feb 2008 22:05:53 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Tejun Heo <htejun@...il.com>, 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

Holger Macht wrote:
> 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.

The code should be in generally right direction.  Can you be persuaded
into tracking down what's going on?

Thanks.

-- 
tejun
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