linux-kernel - Re: [PATCH V5 09/12] ACPI: introduce acpi platform exclude id list

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Date:	Mon, 28 Apr 2014 09:57:03 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	bhelgaas@...gle.com, matthew.garrett@...ula.com,
	rafael.j.wysocki@...el.com, dmitry.torokhov@...il.com
Subject: Re: [PATCH V5 09/12] ACPI: introduce acpi platform exclude id list

On Mon, 2014-04-28 at 00:21 +0200, Rafael J. Wysocki wrote:
> On Tuesday, April 08, 2014 12:06:56 AM Zhang Rui wrote:
> > For ACPI PIC (PNP0000) and Timer (PNP0100) device objects, although
> > they have _HID control method, but they should not be enumerated to
> > platform bus, because there will never be any platform drivers for them.
> > 
> > Thus an exclude id list is introduced in this patch to prevent
> > those platform device nodes from being created.
> > 
> > Signed-off-by: Zhang Rui <rui.zhang@...el.com>
> 
> This should go into [6/12] as well.
> 
I think it is okay to keep them as separate patches because they do not
break bisect. And this patch is just a cleanup, it does not fix a real
BUG in patch 6/12.

thanks,
rui

> > ---
> >  drivers/acpi/acpi_platform.c |   14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> > 
> > diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c
> > index 33376a9..91ed43a 100644
> > --- a/drivers/acpi/acpi_platform.c
> > +++ b/drivers/acpi/acpi_platform.c
> > @@ -22,6 +22,17 @@
> >  
> >  ACPI_MODULE_NAME("platform");
> >  
> > +static const struct acpi_device_id excluded_id_list[] = {
> > +	{"PNP0000", 0},	/* PIC */
> > +	{"PNP0100", 0},	/* Timer */
> > +	{"", 0},
> > +};
> > +
> > +static bool is_exclusive_device(struct acpi_device *dev)
> > +{
> > +	return !acpi_match_device_ids(dev, excluded_id_list);
> > +}
> > +
> >  /**
> >   * acpi_create_platform_device - Create platform device for ACPI device node
> >   * @adev: ACPI device node to create a platform device for.
> > @@ -48,6 +59,9 @@ int acpi_create_platform_device(struct acpi_device *adev,
> >  	if (adev->physical_node_count)
> >  		return 0;
> >  
> > +	if (is_exclusive_device(adev))
> > +		return 0;
> > +
> >  	INIT_LIST_HEAD(&resource_list);
> >  	count = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
> >  	if (count < 0) {
> > 
> 


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