libata: Integrate ACPI-based PATA/SATA hotplug - version 5
Modern laptops with hotswap bays still tend to utilise a PATA interface on a SATA bridge, generally with the host controller in some legacy emulation mode rather than AHCI. This means that the existing hotplug code in libata is unable to work. The ACPI specification states that these devices can send notifications when hotswapped, which avoids the need to obtain notification from the controller. This patch uses the existing libata-acpi code and simply registers a notification in order to trigger a rescan whenever the firmware signals an event. Signed-off-by: NMatthew Garrett <mjg59@srcf.ucam.org> Signed-off-by: NJeff Garzik <jeff@garzik.org>
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