[RFC PATCH 06/14] can: netlink: make can_tdc_changelink() FD agnostic

[Vincent Mailhol <mailhol.vincent@wanadoo.fr>]

This is a preparation patch for the introduction of CAN XL.

can_tdc_changelink() depends on some varibles which are specific to
CAN FD. Move these to the function parameters list so that, later on,
this function can be reused for the CAN XL TDC.

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
---
 drivers/net/can/dev/netlink.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/can/dev/netlink.c b/drivers/net/can/dev/netlink.c
index f346b4208f1c..50c1658f17a4 100644
--- a/drivers/net/can/dev/netlink.c
+++ b/drivers/net/can/dev/netlink.c
@@ -136,15 +136,16 @@ static int can_validate(struct nlattr *tb[], struct nlattr *data[],
 	return 0;
 }
 
-static int can_tdc_changelink(struct can_priv *priv, const struct nlattr *nla,
+static int can_tdc_changelink(struct data_bittiming_params *dbt_params,
+			      bool tdc_is_enabled, const struct nlattr *nla,
 			      struct netlink_ext_ack *extack)
 {
 	struct nlattr *tb_tdc[IFLA_CAN_TDC_MAX + 1];
 	struct can_tdc tdc = { 0 };
-	const struct can_tdc_const *tdc_const = priv->fd.tdc_const;
+	const struct can_tdc_const *tdc_const = dbt_params->tdc_const;
 	int err;
 
-	if (!tdc_const || !can_fd_tdc_is_enabled(priv))
+	if (!tdc_const || !tdc_is_enabled)
 		return -EOPNOTSUPP;
 
 	err = nla_parse_nested(tb_tdc, IFLA_CAN_TDC_MAX, nla,
@@ -179,7 +180,7 @@ static int can_tdc_changelink(struct can_priv *priv, const struct nlattr *nla,
 		tdc.tdcf = tdcf;
 	}
 
-	priv->fd.tdc = tdc;
+	dbt_params->tdc = tdc;
 
 	return 0;
 }
@@ -336,8 +337,8 @@ static int can_changelink(struct net_device *dev, struct nlattr *tb[],
 		memset(&priv->fd.tdc, 0, sizeof(priv->fd.tdc));
 		if (data[IFLA_CAN_TDC]) {
 			/* TDC parameters are provided: use them */
-			err = can_tdc_changelink(priv, data[IFLA_CAN_TDC],
-						 extack);
+			err = can_tdc_changelink(&priv->fd, can_fd_tdc_is_enabled(priv),
+						 data[IFLA_CAN_TDC], extack);
 			if (err) {
 				priv->ctrlmode &= ~CAN_CTRLMODE_FD_TDC_MASK;
 				return err;
-- 
2.45.2