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

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Date:	Thu, 28 Feb 2013 22:49:27 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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 Wednesday, February 27, 2013 06:33:13 PM Greg Kroah-Hartman wrote:
> 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 :)

Heh, thanks!

Still, it seems that we can do a bit better that this.

The two patches that will follow should be almost functionally equivalent to
the $subject one, but the resulting code looks somewhat cleaner to me.

[1/2] Add .macth() callback to struct acpi_bus_type (instead of the bus pointer).
[2/2] Drop .find_bridge() from struct acpi_bus_type

Thanks,
Rafael


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