Re: [PATCH v1] vxcan: Support per-netns device unregistration.

[sashiko-bot@kernel.org]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] The patch calls the undefined function `unregister_netdevice_queue_net()`, resulting in a compilation error.
--

--- Patch [1]: [PATCH v1] vxcan: Support per-netns device unregistration. ---
commit 882fcd31630d9ce6b0a57cc99738c2ad0579763f
Author: Kuniyuki Iwashima <kuniyu@google.com>

vxcan: Support per-netns device unregistration.

This commit updates vxcan_dellink() to unregister local and peer devices
safely across different namespaces by using xchg(). The change aims to
prevent double-queuing of device destruction when RTNL is removed.

> diff --git a/drivers/net/can/vxcan.c b/drivers/net/can/vxcan.c
> --- a/drivers/net/can/vxcan.c
> +++ b/drivers/net/can/vxcan.c

[ ... ]

> @@ -281,24 +284,25 @@ static int vxcan_newlink(struct net_device *dev,
>  
>  static void vxcan_dellink(struct net_device *dev, struct list_head *head)
>  {

[ ... ]

>  	unregister_netdevice_queue(dev, head);
>  
> -	if (peer) {
> -		priv = netdev_priv(peer);
> -		RCU_INIT_POINTER(priv->peer, NULL);
> -		unregister_netdevice_queue(peer, head);
> -	}
> +	priv = netdev_priv(peer);
> +	dev = unrcu_pointer(xchg(&priv->peer, NULL));
> +	if (dev)
> +		unregister_netdevice_queue_net(dev_net(dev), peer, head);

[Severity: Low]
Is this missing a prerequisite patch? It appears that
unregister_netdevice_queue_net() is not defined anywhere in the kernel
tree, which leads to a compilation error when building vxcan.c.

> +
> +	netdev_put(peer, peer_tracker);
> +	netdev_put(dev, &priv->peer_tracker);
>  }

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260712212113.181121-1-kuniyu@google.com?part=1