From: Marc Kleine-Budde mkl@pengutronix.de
[ Upstream commit ec30c109391c5eac9b1d689a61e4bfed88148947 ]
This patch is similar to 7e193a42c37c ("can: netlink: allow configuring of fixed bit rates without need for do_set_bittiming callback") but for data bit rates instead of bit rates.
Usually CAN devices support configurable data bit rates. The limits are defined by struct can_priv::data_bittiming_const. Another way is to implement the struct can_priv::do_set_data_bittiming callback.
If the bit rate is configured via netlink, the can_changelink() function checks that either can_priv::data_bittiming_const or struct can_priv::do_set_data_bittiming is implemented.
In commit 431af779256c ("can: dev: add CAN interface API for fixed bitrates") an API for configuring bit rates on CAN interfaces that only support fixed bit rates was added. The supported bit rates are defined by struct can_priv::bitrate_const.
However the above mentioned commit forgot to add the struct can_priv::data_bitrate_const to the check in can_changelink().
In order to avoid to implement a no-op can_priv::do_set_data_bittiming callback on devices with fixed data bit rates, extend the check in can_changelink() accordingly.
Link: https://lore.kernel.org/all/20220613143633.4151884-1-mkl@pengutronix.de Fixes: 431af779256c ("can: dev: add CAN interface API for fixed bitrates") Acked-by: Max Staudt max@enpas.org Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/can/dev/netlink.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/can/dev/netlink.c b/drivers/net/can/dev/netlink.c index cdde7fecefcf..29e2beae3357 100644 --- a/drivers/net/can/dev/netlink.c +++ b/drivers/net/can/dev/netlink.c @@ -170,7 +170,8 @@ static int can_changelink(struct net_device *dev, struct nlattr *tb[], * directly via do_set_bitrate(). Bail out if neither * is given. */ - if (!priv->data_bittiming_const && !priv->do_set_data_bittiming) + if (!priv->data_bittiming_const && !priv->do_set_data_bittiming && + !priv->data_bitrate_const) return -EOPNOTSUPP;
memcpy(&dbt, nla_data(data[IFLA_CAN_DATA_BITTIMING]),