linux-kernel - [PATCH net] net: Always descend into dsa/ folder

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Date: Wed, 15 May 2024 20:33:45 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: netdev@...r.kernel.org
Cc: masahiroy@...nel.org,
	aleksander.lobakin@...el.com,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Stephen Langstaff <stephenlangstaff1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexander Lobakin <alobakin@...me>,
	Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net] net: Always descend into dsa/ folder

Stephen reported that he was unable to get the dsa_loop driver to get
probed, and the reason ended up being because he had CONFIG_FIXED_PHY=y
in his kernel configuration. As Masahiro explained it:

  "obj-m += dsa/" means everything under dsa/ must be modular.

  If there is a built-in object under dsa/ with CONFIG_NET_DSA=m,
  you cannot do  "obj-$(CONFIG_NET_DSA) += dsa/".

  You need to change it back to "obj-y += dsa/".

This was the case here whereby CONFIG_NET_DSA=m, and so the
obj-$(CONFIG_FIXED_PHY) += dsa_loop_bdinfo.o rule is not executed and
the DSA loop mdio_board info structure is not registered with the
kernel, and eventually the device is simply not found.

Fixes: 227d72063fcc ("dsa: simplify Kconfig symbols and dependencies")
Reported-by: Stephen Langstaff <stephenlangstaff1@...il.com>
Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
---
 drivers/net/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 9c053673d6b2..0f6f0f091e0e 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -49,7 +49,7 @@ obj-$(CONFIG_MHI_NET) += mhi_net.o
 obj-$(CONFIG_ARCNET) += arcnet/
 obj-$(CONFIG_CAIF) += caif/
 obj-$(CONFIG_CAN) += can/
-obj-$(CONFIG_NET_DSA) += dsa/
+obj-y += dsa/
 obj-$(CONFIG_ETHERNET) += ethernet/
 obj-$(CONFIG_FDDI) += fddi/
 obj-$(CONFIG_HIPPI) += hippi/
-- 
2.34.1