linux-kernel - Re: [RFC PATCH 2/8] PNPACPI: use whilte list for pnpacpi device enumeration

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Message-ID: <1394342970.9294.2.camel@rzhang1-mobl4>
Date:	Sun, 09 Mar 2014 13:29:30 +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: [RFC PATCH 2/8] PNPACPI: use whilte list for pnpacpi device
 enumeration

On Fri, 2014-03-07 at 02:44 +0100, Rafael J. Wysocki wrote:
> On Wednesday, February 26, 2014 05:11:08 PM Zhang Rui wrote:
> > +
> > +static int __init acpi_pnp_scan_handler_attach(struct acpi_device *adev,
> 
> This can't be __init.
> 
> > +                                   const struct acpi_device_id *id)
> > +{
> > +	return 1;
> > +}
> > +
> > +static int __init acpi_pnp_scan_handler_match(char *devid, char *handlerid)
> 
> And this too.
> 
> > +{
> > +	int i;
> > +
> > +	if (!ispnpidacpi(devid))
> > +		return 0;
> > +
> > +	if (memcmp(devid, handlerid, 3))
> > +		return 0;
> > +
> > +        for (i = 3; i < 7; i++) {
> > +                if (handlerid[i] != 'X' &&
> > +		    toupper(devid[i]) != toupper(handlerid[i]))
> > +                        return 0;
> > +        }
> > +	return 1;
> > +}
> > +
> > +static struct acpi_scan_handler pnpacpi_handler __initdata = {
> 
> And this cannot be __initdata, because the list of ACPI scan handlers is
> walked during hotplug.
> 
right. will update it in next version.

> > +	.ids = acpi_pnp_device_ids,
> > +	.match = acpi_pnp_scan_handler_match,
> > +	.attach = acpi_pnp_scan_handler_attach,
> > +};
> > +
> > +void __init acpi_pnp_init(void)
> > +{
> > +	acpi_scan_add_handler(&pnpacpi_handler);
> > +}
> > +
> > +static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
> > +						     u32 lvl, void *context,
> > +						     void **rv)
> > +{
> > +	struct acpi_device *device;
> > +
> > +	if (acpi_bus_get_device(handle, &device))
> > +		return AE_CTRL_DEPTH;
> > +	if (device->handler == &pnpacpi_handler)
> > +		pnpacpi_add_device(device);
> 
> Why don't you do that in acpi_pnp_scan_handler_attach() ?
> 
because the PNP bus is not ready at that time.

thanks,
rui

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