net: lan966x: check for ptp to be enabled in lan966x_ptp_deinit()

[ Upstream commit b0e380b5d4275299adf43e249f18309331b6f54f ]

If ptp was not enabled due to missing IRQ for instance,
lan966x_ptp_deinit() will dereference NULL pointers.

Fixes: d096459494a8 ("net: lan966x: Add support for ptp clocks")
Signed-off-by: Clément Léger <clement.leger@bootlin.com>
Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
index e5a2bbe..8e36831 100644 (file)
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c
@@ -853,6 +853,9 @@ void lan966x_ptp_deinit(struct lan966x *lan966x)
        struct lan966x_port *port;
        int i;
 
+       if (!lan966x->ptp)
+               return;
+
        for (i = 0; i < lan966x->num_phys_ports; i++) {
                port = lan966x->ports[i];
                if (!port)