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net: mdio-mux: Handle -EPROBE_DEFER correctly

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[ Upstream commit 7bd0cef5dac685f09ef8b0b2a7748ff42d284dc7 ]

When registering mdiobus children, if we get an -EPROBE_DEFER, we shouldn't
ignore it and continue registering the rest of the mdiobus children. This
would permanently prevent the deferring child mdiobus from working instead
of reattempting it in the future. So, if a child mdiobus needs to be
reattempted in the future, defer the entire mdio-mux initialization.

This fixes the issue where PHYs sitting under the mdio-mux aren't
initialized correctly if the PHY's interrupt controller is not yet ready
when the mdio-mux is being probed. Additional context in the link below.

Fixes: 0ca2997d1452 ("netdev/of/phy: Add MDIO bus multiplexer support.")
Link: https://lore.kernel.org/lkml/CAGETcx95kHrv8wA-O+-JtfH7H9biJEGJtijuPVN0V5dUKUAB3A@mail.gmail.com/#t
Signed-off-by: Saravana Kannan <saravanak@google.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Marc Zyngier <maz@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Acked-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Saravana Kannan 2021-08-17 20:38:03 -07:00 committed by Sasha Levin
parent 453486e79e
commit 84dbbf5482
1 changed files with 6 additions and 2 deletions
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8
drivers/net/phy/mdio-mux.c
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@ -175,11 +175,15 @@ int mdio_mux_init(struct device *dev,
cb->mii_bus->write = mdio_mux_write;
r = of_mdiobus_register(cb->mii_bus, child_bus_node);
if (r) {
mdiobus_free(cb->mii_bus);
if (r == -EPROBE_DEFER) {
ret_val = r;
goto err_loop;
}
devm_kfree(dev, cb);
dev_err(dev,
"Error: Failed to register MDIO bus for child %pOF\n",
child_bus_node);
mdiobus_free(cb->mii_bus);
devm_kfree(dev, cb);
} else {
cb->next = pb->children;
pb->children = cb;