[PATCH net] net: dsa: mv88e6xxx: override existent unicast portvec in port_fdb_add

[DENG Qingfang]

Having multiple destination ports for a unicast address does not make
sense.
Make port_db_load_purge override existent unicast portvec instead of
adding a new port bit.

Fixes: 884729399260 ("net: dsa: mv88e6xxx: handle multiple ports in ATU")
Signed-off-by: DENG Qingfang <dqf...@gmail.com>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index b99f27b8c084..ae0b490f00cd 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1686,7 +1686,11 @@ static int mv88e6xxx_port_db_load_purge(struct 
mv88e6xxx_chip *chip, int port,
                if (!entry.portvec)
                        entry.state = 0;
        } else {
-               entry.portvec |= BIT(port);
+               if (state == MV88E6XXX_G1_ATU_DATA_STATE_UC_STATIC)
+                       entry.portvec = BIT(port);
+               else
+                       entry.portvec |= BIT(port);
+
                entry.state = state;
        }
 
-- 
2.25.1