linux-kernel - RE: [PATCH v3 4/8] platform/x86: wmi: create character devices when requested by drivers

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Date:   Sun, 1 Oct 2017 14:25:00 +0000
From:   <Mario.Limonciello@...l.com>
To:     <gregkh@...uxfoundation.org>
CC:     <dvhart@...radead.org>, <andy.shevchenko@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <platform-driver-x86@...r.kernel.org>, <luto@...nel.org>,
        <quasisec@...gle.com>, <pali.rohar@...il.com>, <rjw@...ysocki.net>,
        <mjg59@...gle.com>, <hch@....de>
Subject: RE: [PATCH v3 4/8] platform/x86: wmi: create character devices when
 requested by drivers

> -----Original Message-----
> From: Greg KH [mailto:gregkh@...uxfoundation.org]
> Sent: Sunday, October 1, 2017 8:24 AM
> To: Limonciello, Mario <Mario_Limonciello@...l.com>
> Cc: dvhart@...radead.org; andy.shevchenko@...il.com; linux-
> kernel@...r.kernel.org; platform-driver-x86@...r.kernel.org; luto@...nel.org;
> quasisec@...gle.com; pali.rohar@...il.com; rjw@...ysocki.net;
> mjg59@...gle.com; hch@....de
> Subject: Re: [PATCH v3 4/8] platform/x86: wmi: create character devices when
> requested by drivers
> 
> On Sat, Sep 30, 2017 at 07:26:57PM +0000, Mario.Limonciello@...l.com wrote:
> > I think what's Darren's most interested in is the that conceptually this is
> > an approach you can agree with.
> >
> > "A WMI vendor driver binds to the WMI bus and requests the WMI bus to
> create
> > a character device.  The WMI bus creates a character device /dev/wmi/$driver
> > which the WMI vendor driver will process all various file operations."
> 
> We've been over this before, let's see that actual implementation which
> defines the "will process all..." implementation to see if that is
> actually an acceptable thing.
> 
> thanks,
> 
> greg k-h

I'm working on changes still (that you'll be CC on), but I don't expect this specific 
concept to change in the future changes:

Bus creating character device:
https://patchwork.kernel.org/patch/9975283/

Driver requesting character device:
https://patchwork.kernel.org/patch/9975263/