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

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Date:   Tue, 6 Oct 2020 17:50:21 +0000
From:   "Saleem, Shiraz" <shiraz.saleem@...el.com>
To:     Leon Romanovsky <leon@...nel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
CC:     "Ertman, David M" <david.m.ertman@...el.com>,
        "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>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "Patil, Kiran" <kiran.patil@...el.com>
Subject: RE: [PATCH v2 1/6] Add ancillary bus support

> 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.
> >
> > > > Add support for the Ancillary Bus, ancillary_device and ancillary_driver.
> > > > It enables drivers to create an ancillary_device and bind an
> > > > ancillary_driver to it.
> > >
> > > I was under impression that this name is going to be changed.
> >
> > It's part of the opens stated in the cover letter.
> 
> ok, so what are the variants?
> system bus (sysbus), sbsystem bus (subbus), crossbus ?
> 
> >
> > [...]
> >
> > > > +	const struct my_driver my_drv = {
> > > > +		.ancillary_drv = {
> > > > +			.driver = {
> > > > +				.name = "myancillarydrv",
> > >
> > > Why do we need to give control over driver name to the driver authors?
> > > It can be problematic if author puts name that already exists.
> >
> > Good point. When I used the ancillary_devices for my own SoundWire
> > test, the driver name didn't seem specifically meaningful but needed
> > to be set to something, what mattered was the id_table. Just thinking
> > aloud, maybe we can add prefixing with KMOD_BUILD, as we've done
> > already to avoid collisions between device names?
> 
> IMHO, it shouldn't be controlled by the drivers at all and need to have kernel
> module name hardwired. Users will use it later for various bind/unbind/autoprobe
> tricks and it will give predictability for them.
> 

+1. This name is not used in the match. Having the bus hardwire the modname sounds like a good idea.

Shiraz