linux-kernel - Re: [PATCH] Fixups to ATA ACPI hotplug

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Date:	Tue, 20 May 2008 10:49:29 +0200
From:	Holger Macht <hmacht@...e.de>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Tejun Heo <htejun@...il.com>, linux-ide@...r.kernel.org,
	Jeff Garzik <jeff@...zik.org>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fixups to ATA ACPI hotplug

On Mon 19. May - 17:29:34, Matthew Garrett wrote:
> The libata-acpi.c code currently accepts hotplug messages from both the 
> port and the device. This does not match the behaviour of the bay 
> driver, and may result in confusion when two hotplug requests are 
> received for the same device. This patch limits the hotplug notification 
> to removable ACPI devices, which in turn allows it to use the _STA 
> method to determine whether the device has been removed or inserted. 
> On removal, devices are marked as detached. On insertion, a hotplug scan 
> is started. This should avoid lockups caused by the ata layer attempting 
> to scan devices which have been removed. The uevent sending is moved 
> outside the spinlock in order to avoid a warning generated by it firing 
> when interrupts are disabled.
> 
> Signed-off-by: Matthew Garrett <mjg@...hat.com>
> 
> ---
> 
> Holger, I'm pretty sure that this deals with the docking station removal 
> case, but don't have the hardware to test. If EJECT_REQUEST is genuinely 

I tried it, it doesn't.

 Undock --> some userspace app accesses the device --> hard lockup

> the only notification we receive (ie, no BUS_CHECK or DEVICE_CHECK) then 
> we'll need to add a separate callback for docking.

Yes, see my patch.

Regards,
	Holger
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