# \[PATCH 5.4 60/85\] mdio: fix mdio-thunder.c dependency \& build error

- From: Greg Kroah-Hartman \<gregkh@linuxfoundation.org\>
- Date: 2020-10-12 13:43:35 
- List: netdev
- Page: https://ratatoskr.run/netdev/2020/10/6137144
- Thread: https://ratatoskr.run/stable/2020/10/6137119/t.md

```text
From: Randy Dunlap <rdunlap@infradead.org>

[ Upstream commit 7dbbcf496f2a4b6d82cfc7810a0746e160b79762 ]

Fix build error by selecting MDIO_DEVRES for MDIO_THUNDER.
Fixes this build error:

ld: drivers/net/phy/mdio-thunder.o: in function `thunder_mdiobus_pci_probe':
drivers/net/phy/mdio-thunder.c:78: undefined reference to `devm_mdiobus_alloc_size'

Fixes: 379d7ac7ca31 ("phy: mdio-thunder: Add driver for Cavium Thunder SoC MDIO buses.")
Reported-by: kernel test robot <redacted>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Bartosz Golaszewski <redacted>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Heiner Kallweit <hkallweit1@gmail.com>
Cc: <redacted>
Cc: David Daney <redacted>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/phy/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index fe602648b99f5..dcf2051ef2c04 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -193,6 +193,7 @@ config MDIO_THUNDER
 	depends on 64BIT
 	depends on PCI
 	select MDIO_CAVIUM
+	select MDIO_DEVRES
 	help
 	  This driver supports the MDIO interfaces found on Cavium
 	  ThunderX SoCs when the MDIO bus device appears as a PCI
-- 
2.25.1



```