linux-kernel - [PATCH RFC 2/5] can: dev: turn can_set_static

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Message-Id: <20250918-can-fix-mtu-v1-2-471edb942295@kernel.org>
Date: Thu, 18 Sep 2025 21:59:12 +0900
From: Vincent Mailhol <mailhol@...nel.org>
To: Oliver Hartkopp <socketcan@...tkopp.net>, 
 Marc Kleine-Budde <mkl@...gutronix.de>
Cc: linux-can@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Vincent Mailhol <mailhol@...nel.org>
Subject: [PATCH RFC 2/5] can: dev: turn can_set_static_ctrlmode() into a
 non-inline function

can_set_static_ctrlmode() is declared as a static inline. But it is
only called in the probe function of the devices and so does not
really benefit from any kind of optimization.

Transform it into a "normal" function by moving it to

  drivers/net/can/dev/dev.c

Signed-off-by: Vincent Mailhol <mailhol@...nel.org>
---
This also serves as a preparation for the next patch in which we are
adding can_set_default_mtu(). That function will only be used by the
can_dev.ko module and so we do not need to export its GPL
symbol. However, if can_set_static_ctrlmode() stays as a static
inline, then the call to set_default_mtu(), which we plan to add in
can_set_static_ctrlmode(), would also be inlined and thus would become
visible to the users of can_set_static_ctrlmode().

Making can_set_static_ctrlmode() a non-inline function resolve this
dependency.
---
 drivers/net/can/dev/dev.c | 21 +++++++++++++++++++++
 include/linux/can/dev.h   | 23 ++---------------------
 2 files changed, 23 insertions(+), 21 deletions(-)

diff --git a/drivers/net/can/dev/dev.c b/drivers/net/can/dev/dev.c
index 3913971125de0ab16b4ad9f36712954141014ddf..a0ae659beedcd1fa0979662c12614ae7846032c0 100644
--- a/drivers/net/can/dev/dev.c
+++ b/drivers/net/can/dev/dev.c
@@ -347,6 +347,27 @@ int can_change_mtu(struct net_device *dev, int new_mtu)
 }
 EXPORT_SYMBOL_GPL(can_change_mtu);
 
+/* helper to define static CAN controller features at device creation time */
+int can_set_static_ctrlmode(struct net_device *dev, u32 static_mode)
+{
+	struct can_priv *priv = netdev_priv(dev);
+
+	/* alloc_candev() succeeded => netdev_priv() is valid at this point */
+	if (priv->ctrlmode_supported & static_mode) {
+		netdev_warn(dev,
+			    "Controller features can not be supported and static at the same time\n");
+		return -EINVAL;
+	}
+	priv->ctrlmode = static_mode;
+
+	/* override MTU which was set by default in can_setup()? */
+	if (static_mode & CAN_CTRLMODE_FD)
+		dev->mtu = CANFD_MTU;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(can_set_static_ctrlmode);
+
 /* generic implementation of netdev_ops::ndo_eth_ioctl for CAN devices
  * supporting hardware timestamps
  */
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 9a92cbe5b2cb7ccdfca3121718856d096e9ecfa6..5dc58360c2d74a1711d4e02d28fe52ae20b146e0 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -125,27 +125,6 @@ static inline s32 can_get_relative_tdco(const struct can_priv *priv)
 	return (s32)priv->fd.tdc.tdco - sample_point_in_tc;
 }
 
-/* helper to define static CAN controller features at device creation time */
-static inline int __must_check can_set_static_ctrlmode(struct net_device *dev,
-						       u32 static_mode)
-{
-	struct can_priv *priv = netdev_priv(dev);
-
-	/* alloc_candev() succeeded => netdev_priv() is valid at this point */
-	if (priv->ctrlmode_supported & static_mode) {
-		netdev_warn(dev,
-			    "Controller features can not be supported and static at the same time\n");
-		return -EINVAL;
-	}
-	priv->ctrlmode = static_mode;
-
-	/* override MTU which was set by default in can_setup()? */
-	if (static_mode & CAN_CTRLMODE_FD)
-		dev->mtu = CANFD_MTU;
-
-	return 0;
-}
-
 static inline u32 can_get_static_ctrlmode(struct can_priv *priv)
 {
 	return priv->ctrlmode & ~priv->ctrlmode_supported;
@@ -188,6 +167,8 @@ struct can_priv *safe_candev_priv(struct net_device *dev);
 int open_candev(struct net_device *dev);
 void close_candev(struct net_device *dev);
 int can_change_mtu(struct net_device *dev, int new_mtu);
+int __must_check can_set_static_ctrlmode(struct net_device *dev,
+					 u32 static_mode);
 int can_eth_ioctl_hwts(struct net_device *netdev, struct ifreq *ifr, int cmd);
 int can_ethtool_op_get_ts_info_hwts(struct net_device *dev,
 				    struct kernel_ethtool_ts_info *info);

-- 
2.49.1