[PATCH v2 net-next 07/15] net: dsa: sja1105: exit sja1105_vlan_filtering when called multiple times

From: Vladimir Oltean
Date: Mon May 11 2020 - 09:54:56 EST


From: Vladimir Oltean <vladimir.oltean@xxxxxxx>

VLAN filtering is a global property for sja1105, and that means that we
rely on the DSA core to not call us more than once.

But we need to introduce some per-port state for the tagger, namely the
xmit_tpid, and the best place to do that is where the xmit_tpid changes,
namely in sja1105_vlan_filtering. So at the moment, exit early from the
function to avoid unnecessarily resetting the switch for each port call.
Then we'll change the xmit_tpid prior to the early exit in the next
patch.

Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
---
Changes in v2:
None.

drivers/net/dsa/sja1105/sja1105_main.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index d2755ab2853d..82b424a03658 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -2158,6 +2158,9 @@ static int sja1105_vlan_filtering(struct dsa_switch *ds, int port, bool enabled)
else
state = SJA1105_VLAN_FILTERING_FULL;

+ if (priv->vlan_state == state)
+ return 0;
+
priv->vlan_state = state;

table = &priv->static_config.tables[BLK_IDX_GENERAL_PARAMS];
--
2.17.1