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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2023-09-08 16:33:52 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-09-11 08:32:30 +0100 |
| commit | 86899e9e1e29e854b5f6dcc24ba4f75f792c89aa (patch) | |
| tree | 384540272566daf3c11747801d9f7a0ed78697c5 /drivers | |
| parent | ea32690daf4fa525dc5a4d164bd00ed8c756e1c6 (diff) | |
| download | linux-stable-86899e9e1e29e854b5f6dcc24ba4f75f792c89aa.tar.gz linux-stable-86899e9e1e29e854b5f6dcc24ba4f75f792c89aa.tar.bz2 linux-stable-86899e9e1e29e854b5f6dcc24ba4f75f792c89aa.zip | |
net: dsa: sja1105: block FDB accesses that are concurrent with a switch reset
Currently, when we add the first sja1105 port to a bridge with
vlan_filtering 1, then we sometimes see this output:
sja1105 spi2.2: port 4 failed to read back entry for be:79:b4:9e:9e:96 vid 3088: -ENOENT
sja1105 spi2.2: Reset switch and programmed static config. Reason: VLAN filtering
sja1105 spi2.2: port 0 failed to add be:79:b4:9e:9e:96 vid 0 to fdb: -2
It is because sja1105_fdb_add() runs from the dsa_owq which is no longer
serialized with switch resets since it dropped the rtnl_lock() in the
blamed commit.
Either performing the FDB accesses before the reset, or after the reset,
is equally fine, because sja1105_static_fdb_change() backs up those
changes in the static config, but FDB access during reset isn't ok.
Make sja1105_static_config_reload() take the fdb_lock to fix that.
Fixes: 0faf890fc519 ("net: dsa: drop rtnl_lock from dsa_slave_switchdev_event_work")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/dsa/sja1105/sja1105_main.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c index cefd72617af4..1a367e64bc3b 100644 --- a/drivers/net/dsa/sja1105/sja1105_main.c +++ b/drivers/net/dsa/sja1105/sja1105_main.c @@ -2297,6 +2297,7 @@ int sja1105_static_config_reload(struct sja1105_private *priv, int rc, i; s64 now; + mutex_lock(&priv->fdb_lock); mutex_lock(&priv->mgmt_lock); mac = priv->static_config.tables[BLK_IDX_MAC_CONFIG].entries; @@ -2409,6 +2410,7 @@ int sja1105_static_config_reload(struct sja1105_private *priv, goto out; out: mutex_unlock(&priv->mgmt_lock); + mutex_unlock(&priv->fdb_lock); return rc; } |