linux-kernel - RE: [PATCH v3 2/4] bus: fsl-mc: add restool userspace support

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Date:   Fri, 23 Mar 2018 20:13:47 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Laurentiu Tudor <laurentiu.tudor@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stuyoder@...il.com" <stuyoder@...il.com>,
        Ruxandra Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
        "arnd@...db.de" <arnd@...db.de>,
        Razvan Stefanescu <razvan.stefanescu@....com>,
        Roy Pledge <roy.pledge@....com>
Subject: RE: [PATCH v3 2/4] bus: fsl-mc: add restool userspace support

> >
> > >
> > > On Fri, Mar 23, 2018 at 10:38:56AM -0500, Ioana Ciornei wrote:
> > > > +#include "fsl-mc-private.h"
> > > > +
> > > > +#define FSL_MC_BUS_MAX_MINORS	1
> > >
> > > As you only need/want one character device here, why not just use
> > > the misc device api?  It's much simpler, and handles all of the
> > > housekeeping for you correctly.  It also means I don't have to audit
> > > all of your chardev code to verify it is correct :)
> >
> > I have considered the misc device api but the fsl-mc bus, since it is
> > a platform driver, is probing before the misc char driver.
> 
> How?  The misc code is just "core code" there's nothing to "probe" here.
> Is this an init-call ordering issue somehow?  A platform driver probe should be
> after the misc core is initialized.  And if not, you can always defer your probe.

Sorry for the previous improper wording. I have tested again using the misc device api and indeed the devices on the fsl-mc bus are probing before the misc core is initialized but I am able to complete the misc registration deferring the probe the first time.

I will update the patch set and send a new version.

Ioana C


> 
> thanks,
> 
> greg k-h