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

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Message-ID: <20130228023313.GC4042@kroah.com>
Date:	Wed, 27 Feb 2013 18:33:13 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	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>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [Resend][PATCH] ACPI / glue: Drop .find_bridge() callback from
 struct acpi_bus_type

On Thu, Feb 28, 2013 at 02:11:58AM +0100, Rafael J. Wysocki wrote:
> On Wednesday, February 27, 2013 02:20:32 PM Greg Kroah-Hartman 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?
> 
> That won't be necessary afer this patch.  Or do you want to fix up USB
> separately first?

No, sorry, my misunderstanding, I was assuming we still needed to do
other USB work after this.  If not, that's an even better reason to
accept this patch :)

thanks,

greg k-h
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