From: Michael Walle michael@walle.cc
[ Upstream commit b58cdd4388b1d8f5bee9f5a3897a7e780d1eaa48 ]
At the moment, if devm_of_phy_get() returns an error the serdes simply isn't set. While it is bad to ignore an error in general, there is a particular bug that network isn't working if the serdes driver is compiled as a module. In that case, devm_of_phy_get() returns -EDEFER_PROBE and the error is silently ignored.
The serdes is optional, it is not there if the port is using RGMII, in which case devm_of_phy_get() returns -ENODEV. Rearrange the error handling so that -ENODEV will be handled but other error codes will abort the probing.
Fixes: d28d6d2e37d1 ("net: lan966x: add port module support") Signed-off-by: Michael Walle michael@walle.cc Link: https://lore.kernel.org/r/20220525231239.1307298-1-michael@walle.cc Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/microchip/lan966x/lan966x_main.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c index 05f6dcc9dfd5..f180a157eea4 100644 --- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c @@ -1080,8 +1080,13 @@ static int lan966x_probe(struct platform_device *pdev) lan966x->ports[p]->fwnode = fwnode_handle_get(portnp);
serdes = devm_of_phy_get(lan966x->dev, to_of_node(portnp), NULL); - if (!IS_ERR(serdes)) - lan966x->ports[p]->serdes = serdes; + if (PTR_ERR(serdes) == -ENODEV) + serdes = NULL; + if (IS_ERR(serdes)) { + err = PTR_ERR(serdes); + goto cleanup_ports; + } + lan966x->ports[p]->serdes = serdes;
lan966x_port_init(lan966x->ports[p]); }