From: Codrin Ciubotariu codrin.ciubotariu@microchip.com
[ Upstream commit af199a1a9cb02ec0194804bd46c174b6db262075 ]
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/dsa/microchip/ksz8795.c | 3 +++ drivers/net/dsa/microchip/ksz9477.c | 3 +++ 2 files changed, 6 insertions(+)
--- a/drivers/net/dsa/microchip/ksz8795.c +++ b/drivers/net/dsa/microchip/ksz8795.c @@ -1270,6 +1270,9 @@ static int ksz8795_switch_init(struct ks /* set the real number of ports */ dev->ds->num_ports = dev->port_cnt;
+ /* set the real number of ports */ + dev->ds->num_ports = dev->port_cnt; + return 0; }
--- a/drivers/net/dsa/microchip/ksz9477.c +++ b/drivers/net/dsa/microchip/ksz9477.c @@ -515,6 +515,9 @@ static int ksz9477_port_vlan_filtering(s PORT_VLAN_LOOKUP_VID_0, false); }
+ /* set the real number of ports */ + dev->ds->num_ports = dev->port_cnt; + return 0; }