linux-kernel - Re: [PATCH 0/4] ACPI: kill acpi_pci_root

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Message-ID: <16287303.8DVGGcjq5E@vostro.rjw.lan>
Date:	Thu, 04 Oct 2012 23:23:24 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Len Brown <lenb@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 0/4] ACPI: kill acpi_pci_root_start

On Wednesday 03 of October 2012 16:00:10 Yinghai Lu wrote:
> Now acpi_pci_root_driver has two ops: .add and .start, aka acpi_pci_root_add
> and acpi_pci_root_start.
> 
> That is for hotplug handling: .add need to return early to make sure all
> acpi device could be created and added early. So .start could device_add
> pci device that are found in acpi_pci_root_add/pci_acpi_scan_root().
> 
> That is holding pci devics to be out of devices for while.
> 
> We could use bus notifier to handle hotplug case.
> 	CONFIG_HOTPLUG is enabled always now.
> Need to add drivers_autoprobe bit in acpi_device to hold attaching drivers
> for acpi_devices, so could make sure all acpi_devices get created at first.
> Then acpi_bus_attach() that is called from acpi_bus_add will attach driver
> for all acpi_devices that are just created.
> 
> That make the logic more simple: hotplug path handling just like booting path
> that drivers are attached after all acpi device get created.
> 
> At last we could remove all acpi_bus_start workaround.

Do I understand correctly that you just want to prevent acpi_pci_root_driver
from binding to the host bridge's struct acpi_device created while we're
walking the ACPI namespace?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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