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net: phy: add a Kconfig option for mdio_devres 

If phylib is built as a module and CONFIG_MDIO_DEVICE is 'y', the
mdio_device and mdio_bus code will be in the phylib module, not in the
kernel image. Meanwhile we build mdio_devres depending on the
CONFIG_MDIO_DEVICE symbol, so if it's 'y', it will go into the kernel
and we'll hit the following linker error:

   ld: drivers/net/phy/mdio_devres.o: in function `devm_mdiobus_alloc_size':
>> drivers/net/phy/mdio_devres.c:38: undefined reference to `mdiobus_alloc_size'
   ld: drivers/net/phy/mdio_devres.o: in function `devm_mdiobus_free':
>> drivers/net/phy/mdio_devres.c:16: undefined reference to `mdiobus_free'
   ld: drivers/net/phy/mdio_devres.o: in function `__devm_mdiobus_register':
>> drivers/net/phy/mdio_devres.c:87: undefined reference to `__mdiobus_register'
   ld: drivers/net/phy/mdio_devres.o: in function `devm_mdiobus_unregister':
>> drivers/net/phy/mdio_devres.c:53: undefined reference to `mdiobus_unregister'
   ld: drivers/net/phy/mdio_devres.o: in function `devm_of_mdiobus_register':
>> drivers/net/phy/mdio_devres.c:120: undefined reference to `of_mdiobus_register'

Add a hidden Kconfig option for MDIO_DEVRES which will be currently
selected by CONFIG_PHYLIB as there are no non-phylib users of these
helpers.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: ac3a68d566 ("net: phy: don't abuse devres in devm_mdiobus_register()")
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bartosz Golaszewski 2020-07-05 11:55:47 +02:00 committed by David S. Miller
parent 9914175f9c
commit 1814cff267
2 changed files with 5 additions and 2 deletions
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4
drivers/net/phy/Kconfig
View File

@ -21,6 +21,9 @@ config MDIO_BUS
if MDIO_BUS
config MDIO_DEVRES
tristate
config MDIO_ASPEED
tristate "ASPEED MDIO bus controller"
depends on ARCH_ASPEED || COMPILE_TEST
@ -252,6 +255,7 @@ menuconfig PHYLIB
tristate "PHY Device support and infrastructure"
depends on NETDEVICES
select MDIO_DEVICE
select MDIO_DEVRES
help
Ethernet controllers are usually attached to PHY
devices. This option provides infrastructure for

3
drivers/net/phy/Makefile
View File

@ -4,7 +4,6 @@
libphy-y := phy.o phy-c45.o phy-core.o phy_device.o \
linkmode.o
mdio-bus-y += mdio_bus.o mdio_device.o
mdio-devres-y += mdio_devres.o
ifdef CONFIG_MDIO_DEVICE
obj-y += mdio-boardinfo.o
@ -18,7 +17,7 @@ libphy-y += $(mdio-bus-y)
else
obj-$(CONFIG_MDIO_DEVICE) += mdio-bus.o
endif
obj-$(CONFIG_MDIO_DEVICE) += mdio-devres.o
obj-$(CONFIG_MDIO_DEVRES) += mdio_devres.o
libphy-$(CONFIG_SWPHY) += swphy.o
libphy-$(CONFIG_LED_TRIGGER_PHY) += phy_led_triggers.o