linux-kernel - Re: [PATCH] Add intel drm blacklist to intel_opregion

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Date:	Tue, 24 Aug 2010 14:35:19 -0700
From:	Greg KH <gregkh@...e.de>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Joey Lee <jlee@...ell.com>, trenn@...e.de,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dennis.Jansen@....de
Subject: Re: [PATCH] Add intel drm blacklist to intel_opregion_present
 detect

On Tue, Aug 24, 2010 at 03:58:03PM +0100, Matthew Garrett wrote:
> On Tue, Aug 24, 2010 at 07:51:30AM -0700, Greg KH wrote:
> > On Tue, Aug 24, 2010 at 03:22:19PM +0100, Matthew Garrett wrote:
> > > Erm. Sorry about that - I just realised that there's actually a fairly 
> > > significant problem with it :) Right now you'll perform the register 
> > > call unconditionally on module load. You need to make sure that there's 
> > > actually Poulsbo hardware in the system, either by registering as a 
> > > proper PCI driver and calling acpi_video_register in your probe function 
> > > (and unregister in your remove function) or walking the PCI device list 
> > > looking for a psb device.
> > 
> > Ick, don't walk the pci device list, just register a "real" pci device
> > and do it that way, it's much simpler and plays nicer with the driver
> > model and the rest of the kernel.
> 
> My only concern with that (and it's not a strong one) is that it'll 
> block the psb driver from binding. Of course, the psb driver should be 
> doing the acpi handling itself anyway, so...

If a system really does have this type of driver on it, it can unbind
this driver and then bind itself, from userspace, so I don't see a
problem with this.

thanks,

greg k-h
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