| Message ID | 20231212-b4-stmmac-handle-mdio-enodev-v2-1-600171acf79f@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [net,v2] net: stmmac: Handle disabled MDIO busses from devicetree | expand |
On Tue, Dec 12, 2023 at 04:18:33PM -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> > --- > Changes in v2: > - Improve error handling code (Serge) > - Fix malformed Fixes tag (Simon) > - Link to v1: https://lore.kernel.org/r/20231211-b4-stmmac-handle-mdio-enodev-v1-1-73c20c44f8d6@redhat.com Looking good. Thanks! Reviewed-by: Serge Semin <fancer.lancer@gmail.com> -Serge(y) > --- > drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 6 +++++- > 1 file changed, 5 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..0542cfd1817e 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c > @@ -591,7 +591,11 @@ 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 == -ENODEV) { > + err = 0; > + dev_info(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; > } > > --- > base-commit: bbd220ce4e29ed55ab079007cff0b550895258eb > change-id: 20231211-b4-stmmac-handle-mdio-enodev-82168de68c6a > > Best regards, > -- > Andrew Halaney <ahalaney@redhat.com> >
Hello: This patch was applied to netdev/net.git (main) by Paolo Abeni <pabeni@redhat.com>: On Tue, 12 Dec 2023 16:18:33 -0600 you 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> > > [...] Here is the summary with links: - [net,v2] net: stmmac: Handle disabled MDIO busses from devicetree https://git.kernel.org/netdev/net/c/e23c0d21ce92 You are awesome, thank you!
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c index fa9e7e7040b9..0542cfd1817e 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c @@ -591,7 +591,11 @@ 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 == -ENODEV) { + err = 0; + dev_info(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; }
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> --- Changes in v2: - Improve error handling code (Serge) - Fix malformed Fixes tag (Simon) - Link to v1: https://lore.kernel.org/r/20231211-b4-stmmac-handle-mdio-enodev-v1-1-73c20c44f8d6@redhat.com --- drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- base-commit: bbd220ce4e29ed55ab079007cff0b550895258eb change-id: 20231211-b4-stmmac-handle-mdio-enodev-82168de68c6a Best regards,