netdev - [PATCH net-next 22/29] can: kvaser_usb_leaf: Fix wrong CAN state after stopping

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Date:   Wed, 26 Oct 2022 10:40:00 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Anssi Hannula <anssi.hannula@...wise.fi>,
        Jimmy Assarsson <extja@...ser.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 22/29] can: kvaser_usb_leaf: Fix wrong CAN state after stopping

From: Anssi Hannula <anssi.hannula@...wise.fi>

0bfd:0124 Kvaser Mini PCI Express 2xHS FW 4.18.778 sends a
CMD_CHIP_STATE_EVENT indicating bus-off after stopping the device,
causing a stopped device to appear as CAN_STATE_BUS_OFF instead of
CAN_STATE_STOPPED.

Fix that by not handling error events on stopped devices.

Fixes: 080f40a6fa28 ("can: kvaser_usb: Add support for Kvaser CAN/USB devices")
Tested-by: Jimmy Assarsson <extja@...ser.com>
Signed-off-by: Anssi Hannula <anssi.hannula@...wise.fi>
Signed-off-by: Jimmy Assarsson <extja@...ser.com>
Link: https://lore.kernel.org/all/20221010185237.319219-8-extja@kvaser.com
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 4 ++++
 1 file changed, 4 insertions(+)

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 12f3d023b72b..d6ca2ac8626c 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -1045,6 +1045,10 @@ static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
 	leaf = priv->sub_priv;
 	stats = &priv->netdev->stats;
 
+	/* Ignore e.g. state change to bus-off reported just after stopping */
+	if (!netif_running(priv->netdev))
+		return;
+
 	/* Update all of the CAN interface's state and error counters before
 	 * trying any memory allocation that can actually fail with -ENOMEM.
 	 *
-- 
2.35.1