linux-kernel - Re: [Resend][PATCH] ACPI / glue: Drop .find_bridge() callback from struct acpi_bus

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Message-ID: <CAE9FiQVEBZy+HP+tthD_C_gJ_6v2be-pGCD0A4TE0z+c8MHXtA@mail.gmail.com>
Date:	Wed, 27 Feb 2013 15:31:08 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lan Tianyu <tianyu.lan@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-usb@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	Jeff Garzik <jgarzik@...ox.com>
Subject: Re: [Resend][PATCH] ACPI / glue: Drop .find_bridge() callback from
 struct acpi_bus_type

On Wed, Feb 27, 2013 at 2:20 PM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Wed, Feb 27, 2013 at 11:06:52PM +0100, Rafael J. Wysocki wrote:
>> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>
>> After PCI has stopped using the .find_bridge() callback in
>> struct acpi_bus_type, the only remaining users of it are SATA and
>> USB.  However, SATA only pretends to be a user, because it points
>> that callback to a stub always returning -ENODEV, and USB uses it
>> incorrectly, because as a result of the way it is used by USB every
>> device in the system that doesn't have a bus type or parent is
>> passed to usb_acpi_find_device() for inspection.
>>
>> What USB actually needs, though, is to call usb_acpi_find_device()
>> for USB ports that don't have a bus type defined, but have
>> usb_port_device_type as their device type.
>
> Ick, that's not good.  Can you have the original creator of that code
> (someone else from Intel, I can't remember at the moment), fix that up
> properly and send me patches?

[Add To: Lan Tianyu <tianyu.lan@...el.com>]

>
>> Please let me know if there are any objections.

I still prefer to ask USB to add bus_type instead at first.

Thanks

Yinghai
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