netdev - [PATCH net-next] net: pcs-xpcs: depend on MDIO

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Date:   Thu, 15 Oct 2020 23:00:23 +0300
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org
Cc:     rdunlap@...radead.org, Jose.Abreu@...opsys.com, andrew@...n.ch,
        sfr@...b.auug.org.au, linux-next@...r.kernel.org,
        Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH net-next] net: pcs-xpcs: depend on MDIO_BUS instead of selecting it

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 <rdunlap@...radead.org>
Acked-by: Randy Dunlap <rdunlap@...radead.org> # build-tested
Fixes: 2fa4e4b799e1 ("net: pcs: Move XPCS into new PCS subdirectory")
Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
 drivers/net/pcs/Kconfig | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/pcs/Kconfig b/drivers/net/pcs/Kconfig
index 074fb3f5db18..22ba7b0b476d 100644
--- a/drivers/net/pcs/Kconfig
+++ b/drivers/net/pcs/Kconfig
@@ -7,8 +7,7 @@ menu "PCS device drivers"
 
 config PCS_XPCS
 	tristate "Synopsys DesignWare XPCS controller"
-	select MDIO_BUS
-	depends on MDIO_DEVICE
+	depends on MDIO_DEVICE && MDIO_BUS
 	help
 	  This module provides helper functions for Synopsys DesignWare XPCS
 	  controllers.
-- 
2.17.1