net: dsa: microchip: set the correct number of ports

The number of ports is incorrectly set to the maximum available for a DSA
switch. Even if the extra ports are not used, this causes some functions
to be called later, like port_disable() and port_stp_state_set(). If the
driver doesn't check the port index, it will end up modifying unknown
registers.

Fixes: b987e98e50ab ("dsa: add DSA switch driver for Microchip KSZ9477")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
index 47d65b77caf77415b730f0ce3ca3b62332e0b2e0..7c17b0f705ec37d626a5298b4b5c8150e5dc7bc3 100644 (file)
--- a/drivers/net/dsa/microchip/ksz8795.c
+++ b/drivers/net/dsa/microchip/ksz8795.c
@@ -1268,6 +1268,9 @@ static int ksz8795_switch_init(struct ksz_device *dev)
                        return -ENOMEM;
        }
 
+       /* set the real number of ports */
+       dev->ds->num_ports = dev->port_cnt;
+
        return 0;
 }
 

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index 9a51b8a4de5d1432a58537dcda4654932e7cc2dc..8d15c301602461106e4c41ab83961e8c6b792169 100644 (file)
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -1588,6 +1588,9 @@ static int ksz9477_switch_init(struct ksz_device *dev)
                        return -ENOMEM;
        }
 
+       /* set the real number of ports */
+       dev->ds->num_ports = dev->port_cnt;
+
        return 0;
 }