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Date:   Sat, 7 Aug 2021 07:22:59 -0700
From:   Richard Cochran <richardcochran@gmail.com>
To:     Vinicius Costa Gomes <vinicius.gomes@intel.com>
Cc:     Yangbo Lu <yangbo.lu@nxp.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
        mptcp@lists.linux.dev, "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Mat Martineau <mathew.j.martineau@linux.intel.com>,
        Matthieu Baerts <matthieu.baerts@tessares.net>,
        Shuah Khan <shuah@kernel.org>,
        Michal Kubecek <mkubecek@suse.cz>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Andrew Lunn <andrew@lunn.ch>, Rui Sousa <rui.sousa@nxp.com>,
        Sebastien Laveze <sebastien.laveze@nxp.com>
Subject: Re: [net-next, v5, 02/11] ptp: support ptp physical/virtual clocks
 conversion
Message-ID: <20210807142259.GB22362@hoboy.vegasvil.org>
References: <20210630081202.4423-1-yangbo.lu@nxp.com>
 <20210630081202.4423-3-yangbo.lu@nxp.com>
 <87r1f6kqby.fsf@vcostago-mobl2.amr.corp.intel.com>
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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