From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: libata hotplug question
Date: Tue, 01 Dec 2009 16:35:40 +1100
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To: Tejun Heo <tj@kernel.org>
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On Tue, 2009-12-01 at 14:22 +0900, Tejun Heo wrote:
> libata-acpi.c does that.  Setting ATA_DFLAG_DETACH device flag and
> scheduling EH will do that.  Please take a look at
> ata_acpi_detach_device() but you must be *sure* that your hot unplug
> notification is completely reliable.

That looks even better than prereset hook actually... I'll have a look

Cheers
Ben.