netdev - RE: [PATCH v2 1/6] Add ancillary bus support

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Date:   Wed, 7 Oct 2020 20:30:09 +0000
From:   "Ertman, David M" <david.m.ertman@...el.com>
To:     Leon Romanovsky <leon@...nel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
CC:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "parav@...lanox.com" <parav@...lanox.com>,
        "tiwai@...e.de" <tiwai@...e.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "ranjani.sridharan@...ux.intel.com" 
        <ranjani.sridharan@...ux.intel.com>,
        "fred.oh@...ux.intel.com" <fred.oh@...ux.intel.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "dledford@...hat.com" <dledford@...hat.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Saleem, Shiraz" <shiraz.saleem@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "Patil, Kiran" <kiran.patil@...el.com>
Subject: RE: [PATCH v2 1/6] Add ancillary bus support

> -----Original Message-----
> From: Leon Romanovsky <leon@...nel.org>
> Sent: Tuesday, October 6, 2020 10:03 AM
> To: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> Cc: Ertman, David M <david.m.ertman@...el.com>; alsa-devel@...a-
> project.org; parav@...lanox.com; tiwai@...e.de; netdev@...r.kernel.org;
> ranjani.sridharan@...ux.intel.com; fred.oh@...ux.intel.com; linux-
> rdma@...r.kernel.org; dledford@...hat.com; broonie@...nel.org;
> jgg@...dia.com; gregkh@...uxfoundation.org; kuba@...nel.org; Williams,
> Dan J <dan.j.williams@...el.com>; Saleem, Shiraz
> <shiraz.saleem@...el.com>; davem@...emloft.net; Patil, Kiran
> <kiran.patil@...el.com>
> Subject: Re: [PATCH v2 1/6] Add ancillary bus support
> 
> On Tue, Oct 06, 2020 at 10:18:07AM -0500, Pierre-Louis Bossart wrote:
> > Thanks for the review Leon.

[...]

> > > > +EXPORT_SYMBOL_GPL(__ancillary_device_add);
> > > > +
> > > > +static int ancillary_probe_driver(struct device *dev)
> > > > +{
> > > > +	struct ancillary_driver *ancildrv = to_ancillary_drv(dev->driver);
> > > > +	struct ancillary_device *ancildev = to_ancillary_dev(dev);
> > > > +	int ret;
> > > > +
> > > > +	ret = dev_pm_domain_attach(dev, true);
> > > > +	if (ret) {
> > > > +		dev_warn(dev, "Failed to attach to PM Domain : %d\n", ret);
> > > > +		return ret;
> > > > +	}
> > > > +
> > > > +	ret = ancildrv->probe(ancildev, ancillary_match_id(ancildrv-
> >id_table, ancildev));
> > >
> > > I don't think that you need to call ->probe() if ancillary_match_id()
> > > returned NULL and probably that check should be done before
> > > dev_pm_domain_attach().
> >
> > we'll look into this.
> >

AKAIK, this callback is only accessed from the bus subsystem after a successful
return from ancillary_match().

-DaveE