From 123515f97cab450b42bdd61fb5e22d09deaccf3e Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Thu, 5 Dec 2024 16:55:16 +0200 Subject: [PATCH] net: mscc: ocelot: improve handling of TX timestamp for unknown skb [ Upstream commit b6fba4b3f0becb794e274430f3a0839d8ba31262 ] This condition, theoretically impossible to trigger, is not really handled well. By "continuing", we are skipping the write to SYS_PTP_NXT which advances the timestamp FIFO to the next entry. So we are reading the same FIFO entry all over again, printing stack traces and eventually killing the kernel. No real problem has been observed here. This is part of a larger rework of the timestamp IRQ procedure, with this logical change split out into a patch of its own. We will need to "goto next_ts" for other conditions as well. Fixes: 9fde506e0c53 ("net: mscc: ocelot: warn when a PTP IRQ is raised for an unknown skb") Signed-off-by: Vladimir Oltean Link: https://patch.msgid.link/20241205145519.1236778-3-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/mscc/ocelot_ptp.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/mscc/ocelot_ptp.c b/drivers/net/ethernet/mscc/ocelot_ptp.c index db00a51a7430..95a5267bc9ce 100644 --- a/drivers/net/ethernet/mscc/ocelot_ptp.c +++ b/drivers/net/ethernet/mscc/ocelot_ptp.c @@ -786,7 +786,7 @@ try_again: spin_unlock_irqrestore(&port->tx_skbs.lock, flags); if (WARN_ON(!skb_match)) - continue; + goto next_ts; if (!ocelot_validate_ptp_skb(skb_match, seqid)) { dev_err_ratelimited(ocelot->dev, @@ -804,7 +804,7 @@ try_again: shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec); skb_complete_tx_timestamp(skb_match, &shhwtstamps); - /* Next ts */ +next_ts: ocelot_write(ocelot, SYS_PTP_NXT_PTP_NXT, SYS_PTP_NXT); } }