| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 101/103] net: mscc: ocelot: warn when a PTP IRQ is raised for an unknown skb | Date | Mon, 18 Oct 2021 15:25:17 +0200 |
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From: Vladimir Oltean <vladimir.oltean@nxp.com>
commit 9fde506e0c53b8309f69b18b4b8144c544b4b3b1 upstream.
When skb_match is NULL, it means we received a PTP IRQ for a timestamp ID that the kernel has no idea about, since there is no skb in the timestamping queue with that timestamp ID.
This is a grave error and not something to just "continue" over. So print a big warning in case this happens.
Also, move the check above ocelot_get_hwtimestamp(), there is no point in reading the full 64-bit current PTP time if we're not going to do anything with it anyway for this skb.
Fixes: 4e3b0468e6d7 ("net: mscc: PTP Hardware Clock (PHC) support") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/net/ethernet/mscc/ocelot.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/net/ethernet/mscc/ocelot.c +++ b/drivers/net/ethernet/mscc/ocelot.c @@ -594,12 +594,12 @@ void ocelot_get_txtstamp(struct ocelot * spin_unlock_irqrestore(&port->tx_skbs.lock, flags); + if (WARN_ON(!skb_match)) + continue; + /* Get the h/w timestamp */ ocelot_get_hwtimestamp(ocelot, &ts); - if (unlikely(!skb_match)) - continue; - /* Set the timestamp into the skb */ memset(&shhwtstamps, 0, sizeof(shhwtstamps)); shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
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