linux-kernel - Re: [net-next, v5, 02/11] ptp: support ptp physical/virtual clocks conversion

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Date:   Sat, 7 Aug 2021 07:22:59 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Vinicius Costa Gomes <vinicius.gomes@...el.com>
Cc:     Yangbo Lu <yangbo.lu@....com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        mptcp@...ts.linux.dev, "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Shuah Khan <shuah@...nel.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Rui Sousa <rui.sousa@....com>,
        Sebastien Laveze <sebastien.laveze@....com>
Subject: Re: [net-next, v5, 02/11] ptp: support ptp physical/virtual clocks
 conversion

On Fri, Aug 06, 2021 at 06:15:29PM -0700, Vinicius Costa Gomes wrote:

> >  int ptp_clock_unregister(struct ptp_clock *ptp)
> >  {
> > +	if (ptp_vclock_in_use(ptp)) {
> > +		pr_err("ptp: virtual clock in use\n");
> > +		return -EBUSY;
> > +	}
> > +
> 
> None of the drivers (that I looked) expect ptp_clock_unregister() to
> return an error.
> 
> So, what should we do?
>  1. Fix all the drivers to return an error on module unloading (that's
>  usually the path ptp_clock_unregister() is called)?
>  2. Remove all the PTP virtual clocks when the physical clock is
>  unregistered?

This:

 3. Let the vclocks hold a reference to the underlying posix dynamic clock.


Thanks,
Richard