netdev - Re: [net-next, v2, 2/7] ptp: support ptp physical/virtual clocks conversion

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Date:   Tue, 25 May 2021 05:28:20 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Yangbo Lu <yangbo.lu@....com>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [net-next, v2, 2/7] ptp: support ptp physical/virtual clocks
 conversion

On Fri, May 21, 2021 at 12:36:14PM +0800, Yangbo Lu wrote:

> @@ -76,6 +77,11 @@ static int ptp_clock_settime(struct posix_clock *pc, const struct timespec64 *tp
>  {
>  	struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
>  
> +	if (ptp_guarantee_pclock(ptp)) {

Going to need to protect against concurrency WRT ptp->num_vclocks.

> +		pr_err("ptp: virtual clock in use, guarantee physical clock free running\n");
> +		return -EBUSY;
> +	}
> +
>  	return  ptp->info->settime64(ptp->info, tp);
>  }

Thanks,
Richard