linux-kernel - Re: [PATCH 06/24] thunderbolt: Introduce thunderbolt bus and connection manager

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Message-ID: <20170519081526.GD3267@lahna.fi.intel.com>
Date:   Fri, 19 May 2017 11:15:26 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        Lukas Wunner <lukas@...ner.de>,
        Amir Levy <amir.jer.levy@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Mario Limonciello <Mario.Limonciello@...l.com>,
        Jared.Dominguez@...l.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/24] thunderbolt: Introduce thunderbolt bus and
 connection manager

On Thu, May 18, 2017 at 07:43:13PM +0300, Andy Shevchenko wrote:
> On Thu, May 18, 2017 at 5:38 PM, Mika Westerberg
> <mika.westerberg@...ux.intel.com> wrote:
> > Thunderbolt fabric consists of one or more switches. This fabric is
> > called domain and it is controlled by an entity called connection
> > manager. The connection manager can be either internal (driven by a
> > firmware running on the host controller) or external (software driver).
> > This driver currently implements support for the latter.
> >
> > In order to manage switches and their properties more easily we model
> > this domain structure as a Linux bus. Each host controller adds a domain
> > device to this bus, and these devices are named as domainN where N
> > stands for index or id of the current domain.
> >
> > We then abstract connection manager specific operations into a new
> > structure tb_cm_ops and convert the existing tb.c to fill those
> > accordingly. This makes it easier to add support for the internal
> > connection manager in subsequent patches.
> 
> One nit below.
> 
> > +static void tb_domain_release(struct device *dev)
> > +{
> > +       struct tb *tb = container_of(dev, struct tb, dev);
> > +
> > +       if (tb->ctl)
> > +               tb_ctl_free(tb->ctl);
> 
> The usual pattern is to put such checks inside *_free() type of functions.

tb_ctl_free() and these patterns are from the original code. I just
moved the calls from tb.c intto here. No problem doing that change but I
suppose that should be done first in a separate patch before this patch.

> > +
> > +       destroy_workqueue(tb->wq);
> > +       ida_simple_remove(&tb_domain_ida, tb->index);
> > +       kfree(tb);
> > +}
> 
> -- 
> With Best Regards,
> Andy Shevchenko