From: Celeste Liu uwu@coelacanthus.name

The gs_usb driver supports USB devices with more than 1 CAN channel. In old kernel before 3.15, it uses net_device->dev_id to distinguish different channel in userspace, which was done in commit acff76fa45b4 ("can: gs_usb: gs_make_candev(): set netdev->dev_id"). But since 3.15, the correct way is populating net_device->dev_port. And according to documentation, if network device support multiple interface, lack of net_device->dev_port SHALL be treated as a bug.

Fixes: acff76fa45b4 ("can: gs_usb: gs_make_candev(): set netdev->dev_id") Cc: stable@vger.kernel.org Signed-off-by: Celeste Liu uwu@coelacanthus.name Link: https://patch.msgid.link/20250930-gs-usb-populate-net_device-dev_port-v1-1-6... Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de --- drivers/net/can/usb/gs_usb.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c index 9fb4cbbd6d6d..69b8d6da651b 100644 --- a/drivers/net/can/usb/gs_usb.c +++ b/drivers/net/can/usb/gs_usb.c @@ -1245,6 +1245,7 @@ static struct gs_can *gs_make_candev(unsigned int channel,

netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */ netdev->dev_id = channel; + netdev->dev_port = channel;

/* dev setup */ strcpy(dev->bt_const.name, KBUILD_MODNAME);