netdev - [PATCH net-next 5/5] ptp: start virtual clocks at current system time.

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Message-Id: <20220127114536.1121765-6-mlichvar@redhat.com>
Date:   Thu, 27 Jan 2022 12:45:36 +0100
From:   Miroslav Lichvar <mlichvar@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Miroslav Lichvar <mlichvar@...hat.com>,
        Yangbo Lu <yangbo.lu@....com>,
        Richard Cochran <richardcochran@...il.com>
Subject: [PATCH net-next 5/5] ptp: start virtual clocks at current system time.

When a virtual clock is being created, initialize the timecounter to the
current system time instead of the Unix epoch to avoid very large steps
when the clock will be synchronized.

Signed-off-by: Miroslav Lichvar <mlichvar@...hat.com>
Cc: Yangbo Lu <yangbo.lu@....com>
Cc: Richard Cochran <richardcochran@...il.com>
---
 drivers/ptp/ptp_vclock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c
index cb179a3ea508..5a24a5128013 100644
--- a/drivers/ptp/ptp_vclock.c
+++ b/drivers/ptp/ptp_vclock.c
@@ -187,7 +187,8 @@ struct ptp_vclock *ptp_vclock_register(struct ptp_clock *pclock)
 		return NULL;
 	}
 
-	timecounter_init(&vclock->tc, &vclock->cc, 0);
+	timecounter_init(&vclock->tc, &vclock->cc,
+			 ktime_to_ns(ktime_get_real()));
 	ptp_schedule_worker(vclock->clock, PTP_VCLOCK_REFRESH_INTERVAL);
 
 	return vclock;
-- 
2.34.1