linux-kernel - Re: [PATCH 12/15] cxl/acpi: Skip devm_cxl_port_enumerate

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Date:   Thu, 1 Sep 2022 09:40:24 +0200
From:   Robert Richter <rrichter@....com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
CC:     Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>
Subject: Re: [PATCH 12/15] cxl/acpi: Skip devm_cxl_port_enumerate_dports()
 when in RCD mode

On 31.08.22 12:58:30, Jonathan Cameron wrote:
> On Wed, 31 Aug 2022 10:16:00 +0200
> Robert Richter <rrichter@....com> wrote:

> > +/*
> > + * A parent of an RCH (CXL 1.1 host) is a plain platform device while
> > + * a 2.0 host links to the ACPI0017 root device.
> > + */
> > +static inline bool is_rch_uport(struct cxl_port *port)
> > +{
> > +	return is_cxl_port(&port->dev) && !port->dev.parent->fwnode;
> 
> I'm not keen on the presence of fwnode being used to distinguish anything.
> That's the sort of thing that gets 'fixed' by later patches.
> 
> Can we check something more specific?

We actually know the parent device is the root device, so we can check
this. Even easier.

Thanks,

-Robert