netdev - [PATCH net-next 3/3] net: dsa: sja1105: Empty the RX timestamping queue on PTP settings change

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Date:   Fri, 27 Dec 2019 04:37:50 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net, jakub.kicinski@...ronome.com
Cc:     richardcochran@...il.com, f.fainelli@...il.com,
        vivien.didelot@...il.com, andrew@...n.ch, netdev@...r.kernel.org,
        Vladimir Oltean <olteanv@...il.com>
Subject: [PATCH net-next 3/3] net: dsa: sja1105: Empty the RX timestamping queue on PTP settings change

When disabling PTP timestamping, don't reset the switch with the new
static config until all existing PTP frames have been timestamped on the
RX path or dropped. There's nothing we can do with these afterwards.

Signed-off-by: Vladimir Oltean <olteanv@...il.com>
---
 drivers/net/dsa/sja1105/sja1105_ptp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/dsa/sja1105/sja1105_ptp.c b/drivers/net/dsa/sja1105/sja1105_ptp.c
index d843c6395e52..a16628cd5f66 100644
--- a/drivers/net/dsa/sja1105/sja1105_ptp.c
+++ b/drivers/net/dsa/sja1105/sja1105_ptp.c
@@ -102,6 +102,8 @@ static int sja1105_change_rxtstamping(struct sja1105_private *priv,
 		kfree_skb(priv->tagger_data.stampable_skb);
 		priv->tagger_data.stampable_skb = NULL;
 	}
+	ptp_cancel_worker_sync(ptp_data->clock);
+	skb_queue_purge(&ptp_data->skb_rxtstamp_queue);
 
 	return sja1105_static_config_reload(priv, SJA1105_RX_HWTSTAMPING);
 }
-- 
2.17.1