netdev - [PATCH net 4/4] can: kvaser_usb_leaf: Fix CAN state after restart

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Date:   Tue, 11 Oct 2022 09:48:15 +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>,
        stable@...r.kernel.org, Jimmy Assarsson <extja@...ser.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net 4/4] can: kvaser_usb_leaf: Fix CAN state after restart

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

can_restart() expects CMD_START_CHIP to set the error state to
ERROR_ACTIVE as it calls netif_carrier_on() immediately afterwards.

Otherwise the user may immediately trigger restart again and hit a
BUG_ON() in can_restart().

Fix kvaser_usb_leaf set_mode(CMD_START_CHIP) to set the expected state.

Cc: stable@...r.kernel.org
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/20221010150829.199676-5-extja@kvaser.com
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 2 ++
 1 file changed, 2 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 59c220ef3049..50f2ac8319ff 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -1431,6 +1431,8 @@ static int kvaser_usb_leaf_set_mode(struct net_device *netdev,
 		err = kvaser_usb_leaf_simple_cmd_async(priv, CMD_START_CHIP);
 		if (err)
 			return err;
+
+		priv->can.state = CAN_STATE_ERROR_ACTIVE;
 		break;
 	default:
 		return -EOPNOTSUPP;
-- 
2.35.1