linux-kernel - Re: [PATCH 2/3] ACPI / hotplug: Fix PCI host bridge hot removal

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Date:	Mon, 18 Nov 2013 11:10:05 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH 2/3] ACPI / hotplug: Fix PCI host bridge hot removal

On Thu, 2013-11-14 at 00:16 +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Since the PCI host bridge scan handler does not set hotplug.enabled,
> the check of it in acpi_bus_device_eject() effectively prevents the
> root bridge hot removal from working after commit a3b1b1ef78cd
> (ACPI / hotplug: Merge device hot-removal routines).  However, that
> check is not necessary, because the other acpi_bus_device_eject()
> users, acpi_hotplug_notify_cb and acpi_eject_store(), do the same
> check by themselves before executing that function.
> 
> For this reason, remove the scan handler check from
> acpi_bus_device_eject() to make PCI hot bridge hot removal work
> again.

I am curious why the PCI host bridge scan handler does not set
hotplug.enabled.  Is this how it disables hotplug via sysfs eject but
enables via ACPI notification?  

Thanks,
-Toshi


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