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@kernel.org>
Closes: https://lore.kernel.org/all/CAMZ6RqL_nGszwoLPXn1Li8op-ox4k3Hs6p=Hw6+w0W=DTtobPw@mail.gmail.com/
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202511280531.YnWW2Rxc-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202511280842.djCQ0N0O-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202511282325.uVQFRTkA-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202511291520.guIE1QHj-lkp@intel.com/
Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://patch.msgid.link/20251129090500.17484-1-socketcan@hartkopp.net
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 52c8be5c160e47796c1e0d7a77f8dc17aaee810d..f6416a56e95d51cb590441ace861ad92a746bf0b 100644 (file)
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -111,7 +111,14 @@ struct net_device *alloc_candev_mqs(int sizeof_priv, unsigned int echo_skb_max,
 void free_candev(struct net_device *dev);
 
 /* a candev safe wrapper around netdev_priv */
+#if IS_ENABLED(CONFIG_CAN_NETLINK)
 struct can_priv *safe_candev_priv(struct net_device *dev);
+#else
+static inline struct can_priv *safe_candev_priv(struct net_device *dev)
+{
+       return NULL;
+}
+#endif
 
 int open_candev(struct net_device *dev);
 void close_candev(struct net_device *dev);

diff --git a/net/can/Kconfig b/net/can/Kconfig
index af64a6f764588cc63862ce285ee47f3245d72d5e..e4ccf731a24ce491bfebe90e119e5c4888218f7d 100644 (file)
--- a/net/can/Kconfig
+++ b/net/can/Kconfig
@@ -5,6 +5,7 @@
 
 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