linux-kernel - [PATCH 00/02] ACPI: sysfs eject support for container

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Date:	Wed,  6 Feb 2013 15:50:54 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	rjw@...k.pl, linux-acpi@...r.kernel.org
Cc:	gregkh@...uxfoundation.org, bhelgaas@...gle.com,
	mika.westerberg@...ux.intel.com, matthew.garrett@...ula.com,
	yinghai@...nel.org, liuj97@...il.com, linux-kernel@...r.kernel.org,
	Toshi Kani <toshi.kani@...com>
Subject: [PATCH 00/02] ACPI: sysfs eject support for container

This patchset enables sysfs eject for ACPI scan drivers and
registers the ACPI container driver as an ACPI scan driver.
This patchset is the one I mentioned in my following reply.

Toshi

Re: [PATCH 2/2] ACPI / scan: Simplify container driver 

On Mon, 2013-02-04 at 00:47 +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> The only useful thing that the ACPI container driver does is to
> install system notify handlers for all container and module device
> objects it finds in the namespace.  The driver structure,
> acpi_container_driver, and the data structures created by its
> .add() callback are in fact not used by the driver, so remove
> them entirely.
> 
> It also makes a little sense to build that driver as a module,
> so make it non-modular and add its initialization to the
> namespace scanning code.
> 
> In addition to that, make the namespace walk callback used for
> installing the notify handlers more straightforward.

I think the container driver needs to be registered as an ACPI scan
driver so that sysfs eject will continue to work for container devices,
such as ACPI0004:XX/eject.  Since the container driver does not support
ACPI eject notification (and we have been discussing how system device
hot-plug should work), this sysfs eject is the only way to eject a
container device at this point.  I will send an update patchset that
applies on top of this patch.
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