| Message ID | 20231211-b4-stmmac-handle-mdio-enodev-v1-1-73c20c44f8d6@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [net] net: stmmac: Handle disabled MDIO busses from devicetree | expand |
On Mon, Dec 11, 2023 at 03:31:17PM -0600, Andrew Halaney wrote: > Many hardware configurations have the MDIO bus disabled, and are instead > using some other MDIO bus to talk to the MAC's phy. > > of_mdiobus_register() returns -ENODEV in this case. Let's handle it > gracefully instead of failing to probe the MAC. > > Fixes: 47dd7a540b8a (net: add support for STMicroelectronics Ethernet controllers.") > Signed-off-by: Andrew Halaney <ahalaney@redhat.com> > --- > drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c > index fa9e7e7040b9..a39be15d41a8 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c > @@ -591,7 +591,13 @@ int stmmac_mdio_register(struct net_device *ndev) > new_bus->parent = priv->device; > > err = of_mdiobus_register(new_bus, mdio_node); > - if (err != 0) { > + if (err) { > + if (err == -ENODEV) { > + /* The bus is disabled in the devicetree, that's ok */ > + mdiobus_free(new_bus); > + return 0; > + } > + > dev_err_probe(dev, err, "Cannot register the MDIO bus\n"); > goto bus_register_fail; > } This can be implemented a bit simpler, more maintainable and saving one indentations level: err = of_mdiobus_register(new_bus, mdio_node); if (err == -ENODEV) { err = 0; dev_warn(dev, "MDIO bus is disabled\n"); goto bus_register_fail; } else if (err) { dev_err_probe(dev, err, "Cannot register the MDIO bus\n"); goto bus_register_fail; } -Serge(y) > > --- > base-commit: bbd220ce4e29ed55ab079007cff0b550895258eb > change-id: 20231211-b4-stmmac-handle-mdio-enodev-82168de68c6a > > Best regards, > -- > Andrew Halaney <ahalaney@redhat.com> >
On Tue, Dec 12, 2023 at 01:59:25PM +0300, Serge Semin wrote: > On Mon, Dec 11, 2023 at 03:31:17PM -0600, Andrew Halaney wrote: > > Many hardware configurations have the MDIO bus disabled, and are instead > > using some other MDIO bus to talk to the MAC's phy. > > > > of_mdiobus_register() returns -ENODEV in this case. Let's handle it > > gracefully instead of failing to probe the MAC. > > > > Fixes: 47dd7a540b8a (net: add support for STMicroelectronics Ethernet controllers.") > > Signed-off-by: Andrew Halaney <ahalaney@redhat.com> > > --- > > drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 8 +++++++- > > 1 file changed, 7 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c > > index fa9e7e7040b9..a39be15d41a8 100644 > > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c > > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c > > @@ -591,7 +591,13 @@ int stmmac_mdio_register(struct net_device *ndev) > > new_bus->parent = priv->device; > > > > err = of_mdiobus_register(new_bus, mdio_node); > > - if (err != 0) { > > + if (err) { > > + if (err == -ENODEV) { > > + /* The bus is disabled in the devicetree, that's ok */ > > + mdiobus_free(new_bus); > > + return 0; > > + } > > + > > dev_err_probe(dev, err, "Cannot register the MDIO bus\n"); > > goto bus_register_fail; > > } > > This can be implemented a bit simpler, more maintainable and saving > one indentations level: > > err = of_mdiobus_register(new_bus, mdio_node); > if (err == -ENODEV) { > err = 0; > dev_warn(dev, "MDIO bus is disabled\n"); Thanks for all your reviews, I agree this is cleaner! I'm going to opt to use dev_info() here as this isn't something that's wrong, just worth noting. > goto bus_register_fail; > } else if (err) { > dev_err_probe(dev, err, "Cannot register the MDIO bus\n"); > goto bus_register_fail; > } > > -Serge(y) > > > > > --- > > base-commit: bbd220ce4e29ed55ab079007cff0b550895258eb > > change-id: 20231211-b4-stmmac-handle-mdio-enodev-82168de68c6a > > > > Best regards, > > -- > > Andrew Halaney <ahalaney@redhat.com> > > >
On Mon, Dec 11, 2023 at 03:31:17PM -0600, Andrew Halaney wrote: > Many hardware configurations have the MDIO bus disabled, and are instead > using some other MDIO bus to talk to the MAC's phy. > > of_mdiobus_register() returns -ENODEV in this case. Let's handle it > gracefully instead of failing to probe the MAC. > > Fixes: 47dd7a540b8a (net: add support for STMicroelectronics Ethernet controllers.") nit: the tag above is malformed, there is a '"' missing before 'net:'. Fixes: 47dd7a540b8a ("net: add support for STMicroelectronics Ethernet controllers.") > Signed-off-by: Andrew Halaney <ahalaney@redhat.com> ...
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c index fa9e7e7040b9..a39be15d41a8 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c @@ -591,7 +591,13 @@ int stmmac_mdio_register(struct net_device *ndev) new_bus->parent = priv->device; err = of_mdiobus_register(new_bus, mdio_node); - if (err != 0) { + if (err) { + if (err == -ENODEV) { + /* The bus is disabled in the devicetree, that's ok */ + mdiobus_free(new_bus); + return 0; + } + dev_err_probe(dev, err, "Cannot register the MDIO bus\n"); goto bus_register_fail; }
Many hardware configurations have the MDIO bus disabled, and are instead using some other MDIO bus to talk to the MAC's phy. of_mdiobus_register() returns -ENODEV in this case. Let's handle it gracefully instead of failing to probe the MAC. Fixes: 47dd7a540b8a (net: add support for STMicroelectronics Ethernet controllers.") Signed-off-by: Andrew Halaney <ahalaney@redhat.com> --- drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- base-commit: bbd220ce4e29ed55ab079007cff0b550895258eb change-id: 20231211-b4-stmmac-handle-mdio-enodev-82168de68c6a Best regards,