linux-kernel - Re: [RFC PATCH 0/8] ACPI: change the way of enumerating PNPACPI/Platform devices

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Message-ID: <1393433267.14900.3.camel@x230>
Date:	Wed, 26 Feb 2014 16:47:48 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	"rui.zhang@...el.com" <rui.zhang@...el.com>
CC:	"dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>
Subject: Re: [RFC PATCH 0/8] ACPI: change the way of enumerating
 PNPACPI/Platform devices

On Wed, 2014-02-26 at 17:11 +0800, Zhang Rui wrote:

> 1. without the patch, the acpi_platform scan handler white list is
>    continuously growing.
> 2. with the patch set, the PNPACPI scan handler white list will become
>    smaller and smaller by
>    a) remove the ids from the PNPACPI white list, for the devices
>       that are never enumerated via ACPI
>    b) remove the ids from the PNPACPI whilte list and convert the drivers to
>       platform bus drivers, for the devices that are not PNP devices in nature.
>    which will be done later.

I agree that this is the right direction to go in. The number of acpipnp
devices that are also pnpbios or (even worse) isapnp is (a) unlikely to
increase, and (b) *very* small, and pretty much limited to superio and a
small number of sound cards on old laptops. We may come up with a better
solution for them later, but right now shifting away from requiring that
every new ACPI device driver also bump a whitelist is an improvement.

-- 
Matthew Garrett <matthew.garrett@...ula.com>