netdev - [can-next] can: Kconfig: select CAN driver infrastructure by default

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Message-ID: <20251128100803.65707-1-socketcan@hartkopp.net>
Date: Fri, 28 Nov 2025 11:08:03 +0100
From: Oliver Hartkopp <socketcan@...tkopp.net>
To: linux-can@...r.kernel.org
Cc: netdev@...r.kernel.org,
	davem@...emloft.net,
	kuba@...nel.org,
	kernel@...gutronix.de,
	mkl@...gutronix.de,
	Oliver Hartkopp <socketcan@...tkopp.net>,
	Vincent Mailhol <mailhol@...nel.org>
Subject: [can-next] can: Kconfig: select CAN driver infrastructure by default

The CAN bus support enabled with CONFIG_CAN provides a socket-based
access to CAN interfaces. With the introduction of the latest CAN protocol
CAN XL additional configuration status information needs to be exposed to
the network layer than formerly provided by standard Linux network drivers.

This requires the CAN driver infrastructure to be selected by default.
As the CAN network layer can only operate on CAN interfaces anyway all
distributions and common default configs enable at least one CAN driver.

So selecting CONFIG_CAN_DEV when CONFIG_CAN is selected by the user has
no effect on established configurations but solves potential build issues
when CONFIG_CAN[_XXX]=y is set together with CANFIG_CAN_DEV=m

Fixes: 1a620a723853 ("can: raw: instantly reject unsupported CAN frames")
Reported-by: Vincent Mailhol <mailhol@...nel.org>
Suggested-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>
---
 net/can/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/can/Kconfig b/net/can/Kconfig
index af64a6f76458..e4ccf731a24c 100644
--- a/net/can/Kconfig
+++ b/net/can/Kconfig
@@ -3,10 +3,11 @@
 # Controller Area Network (CAN) network layer core configuration
 #
 
 menuconfig CAN
 	tristate "CAN bus subsystem support"
+	select CAN_DEV
 	help
 	  Controller Area Network (CAN) is a slow (up to 1Mbit/s) serial
 	  communications protocol. Development of the CAN bus started in
 	  1983 at Robert Bosch GmbH, and the protocol was officially
 	  released in 1986. The CAN bus was originally mainly for automotive,
-- 
2.47.3