This is a note to let you know that I've just added the patch titled
can: kvaser_usb_leaf: Fix bogus restart events
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
can-kvaser_usb_leaf-fix-bogus-restart-events.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e79de62249fd0599b09d1b5125507f108b1f4192
Author: Anssi Hannula <anssi.hannula@xxxxxxxxxx>
Date: Mon Oct 10 20:52:35 2022 +0200
can: kvaser_usb_leaf: Fix bogus restart events
[ Upstream commit 90904d326269a38fe5dd895fb2db7c03199654c4 ]
When auto-restart is enabled, the kvaser_usb_leaf driver considers
transition from any state >= CAN_STATE_BUS_OFF as a bus-off recovery
event (restart).
However, these events may occur at interface startup time before
kvaser_usb_open() has set the state to CAN_STATE_ERROR_ACTIVE, causing
restarts counter to increase and CAN_ERR_RESTARTED to be sent despite no
actual restart having occurred.
Fix that by making the auto-restart condition checks more strict so that
they only trigger when the interface was actually in the BUS_OFF state.
Fixes: 080f40a6fa28 ("can: kvaser_usb: Add support for Kvaser CAN/USB devices")
Tested-by: Jimmy Assarsson <extja@xxxxxxxxxx>
Signed-off-by: Anssi Hannula <anssi.hannula@xxxxxxxxxx>
Signed-off-by: Jimmy Assarsson <extja@xxxxxxxxxx>
Link: https://lore.kernel.org/all/20221010185237.319219-10-extja@xxxxxxxxxx
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
index 52ac6446634d..d1877ff2ff71 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -899,7 +899,7 @@ static void kvaser_usb_leaf_tx_acknowledge(const struct kvaser_usb *dev,
context = &priv->tx_contexts[tid % dev->max_tx_urbs];
/* Sometimes the state change doesn't come after a bus-off event */
- if (priv->can.restart_ms && priv->can.state >= CAN_STATE_BUS_OFF) {
+ if (priv->can.restart_ms && priv->can.state == CAN_STATE_BUS_OFF) {
struct sk_buff *skb;
struct can_frame *cf;
@@ -1002,7 +1002,7 @@ kvaser_usb_leaf_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
}
if (priv->can.restart_ms &&
- cur_state >= CAN_STATE_BUS_OFF &&
+ cur_state == CAN_STATE_BUS_OFF &&
new_state < CAN_STATE_BUS_OFF)
priv->can.can_stats.restarts++;
@@ -1092,7 +1092,7 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
}
if (priv->can.restart_ms &&
- old_state >= CAN_STATE_BUS_OFF &&
+ old_state == CAN_STATE_BUS_OFF &&
new_state < CAN_STATE_BUS_OFF) {
cf->can_id |= CAN_ERR_RESTARTED;
netif_carrier_on(priv->netdev);
