linux-kernel - Re: [Update][PATCH 1/6] ACPI / scan: Start matching drivers after trying scan handlers

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Date:	Tue, 05 Nov 2013 16:27:41 -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: [Update][PATCH 1/6] ACPI / scan: Start matching drivers after
 trying scan handlers

On Mon, 2013-11-04 at 14:30 +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> ACPI scan handlers should always be attached to struct acpi_device
> objects before any ACPI drivers, but there is a window during which
> a driver may be attached to a struct acpi_device before checking if
> there is a matching scan handler.  Namely, that will happen if an
> ACPI driver module is loaded during acpi_bus_scan() right after
> the first namespace walk is complete and before the given device
> is processed by the second namespace walk.
> 
> To prevent that from happening, set the match_driver flags of
> struct acpi_device objects right before running device_attach()
> for them in acpi_bus_device_attach().
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Acked-by: Toshi Kani <toshi.kani@...com>

Thanks,
-Toshi

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