[PATCH net-next 09/13] net: dsa: lantiq_gswip: Forbid gswip_add_single_port_br on the CPU port

[Martin Schiller]

From: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>

Calling gswip_add_single_port_br() with the CPU port would be a bug
because then only the CPU port could talk to itself. Add the CPU port to
the validation at the beginning of gswip_add_single_port_br().

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
---
 drivers/net/dsa/lantiq_gswip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index ee8296d5b901..d2195271ffe9 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -657,7 +657,7 @@ static int gswip_add_single_port_br(struct gswip_priv *priv, int port, bool add)
 	unsigned int max_ports = priv->hw_info->max_ports;
 	int err;
 
-	if (port >= max_ports) {
+	if (port >= max_ports || dsa_is_cpu_port(priv->ds, port)) {
 		dev_err(priv->dev, "single port for %i supported\n", port);
 		return -EIO;
 	}
-- 
2.39.2