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Date:   Fri, 16 Oct 2020 16:56:27 -0700
From:   Jakub Kicinski <>
To:     Ioana Ciornei <>
Subject: Re: [PATCH net-next] net: pcs-xpcs: depend on MDIO_BUS instead of
 selecting it

On Thu, 15 Oct 2020 23:00:23 +0300 Ioana Ciornei wrote:
> The below compile time error can be seen when PHYLIB is configured as a
> module.
>  ld: drivers/net/pcs/pcs-xpcs.o: in function `xpcs_read':
>  pcs-xpcs.c:(.text+0x29): undefined reference to `mdiobus_read'
>  ld: drivers/net/pcs/pcs-xpcs.o: in function `xpcs_soft_reset.constprop.7':
>  pcs-xpcs.c:(.text+0x80): undefined reference to `mdiobus_write'
>  ld: drivers/net/pcs/pcs-xpcs.o: in function `xpcs_config_aneg':
>  pcs-xpcs.c:(.text+0x318): undefined reference to `mdiobus_write'
>  ld: pcs-xpcs.c:(.text+0x38e): undefined reference to `mdiobus_write'
>  ld: pcs-xpcs.c:(.text+0x3eb): undefined reference to `mdiobus_write'
>  ld: pcs-xpcs.c:(.text+0x437): undefined reference to `mdiobus_write'
>  ld: drivers/net/pcs/pcs-xpcs.o:pcs-xpcs.c:(.text+0xb1e): more undefined references to `mdiobus_write' follow
> PHYLIB being a module leads to MDIO_BUS being a module as well while the
> XPCS is still built-in. What should happen in this configuration is that
> PCS_XPCS should be forced to build as module. However, that select only
> acts in the opposite way so we should turn it into a depends.
> Fix this up by explicitly depending on MDIO_BUS.
> Reported-by: Randy Dunlap <>
> Acked-by: Randy Dunlap <> # build-tested
> Fixes: 2fa4e4b799e1 ("net: pcs: Move XPCS into new PCS subdirectory")
> Signed-off-by: Ioana Ciornei <>

Applied, thanks!

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