net: mdio-mux: Handle -EPROBE_DEFER correctly
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: 0ca2997d ("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>
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99d81e94
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