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

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Date:	Thu, 28 Feb 2013 08:23:54 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"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 2013年02月28日 07:31, Yinghai Lu wrote:
> 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>]
Ok. I will fix it later.
> 
>>
>>> Please let me know if there are any objections.
> 
> I still prefer to ask USB to add bus_type instead at first.
> 
> Thanks
> 
> Yinghai
> 


-- 
Best regards
Tianyu Lan
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