linux-kernel - [PATCH 07/12] can: kvaser_usb_leaf: Fix CAN state after restart

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Date:   Mon, 16 May 2022 16:47:43 +0300
From:   Anssi Hannula <anssi.hannula@...wise.fi>
To:     Jimmy Assarsson <extja@...ser.com>
Cc:     linux-can@...r.kernel.org, Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 07/12] can: kvaser_usb_leaf: Fix CAN state after restart

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.

Fixes: 080f40a6fa28 ("can: kvaser_usb: Add support for Kvaser CAN/USB devices")
Signed-off-by: Anssi Hannula <anssi.hannula@...wise.fi>
---
 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 2d30a662edb5..5f27c00179c1 100644
--- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
+++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c
@@ -1411,6 +1411,8 @@ 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;
-- 
2.34.1