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net: mscc: ocelot: warn when a PTP IRQ is raised for an unknown skb

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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: 4e3b0468e6 ("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>
This commit is contained in:
Vladimir Oltean 2021-10-12 14:40:37 +03:00 committed by Jakub Kicinski
parent 52849bcf00
commit 9fde506e0c
1 changed files with 3 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/net/ethernet/mscc/ocelot.c
View file

@ -747,12 +747,12 @@ void ocelot_get_txtstamp(struct ocelot *ocelot)
spin_unlock_irqrestore(&port->tx_skbs.lock, flags); spin_unlock_irqrestore(&port->tx_skbs.lock, flags);
if (WARN_ON(!skb_match))
continue;
/* Get the h/w timestamp */ /* Get the h/w timestamp */
ocelot_get_hwtimestamp(ocelot, &ts); ocelot_get_hwtimestamp(ocelot, &ts);
if (unlikely(!skb_match))
continue;
/* Set the timestamp into the skb */ /* Set the timestamp into the skb */
memset(&shhwtstamps, 0, sizeof(shhwtstamps)); memset(&shhwtstamps, 0, sizeof(shhwtstamps));
shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec); shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);