Re: [PATCH net] netpoll: fix a use-after-free on shutdown path

[Jakub Kicinski]

On Mon, 22 Jun 2026 08:01:23 -0700 Breno Leitao wrote:
> +		 * synchronize_net() does not protect the worker
> +		 * (queue_process() is not an RCU reader). It fences the
> +		 * senders -- the real RCU readers -- so they cannot re-arm
> +		 * tx_work after the np->dev->npinfo was set to NULL.
> +		 */
> +		synchronize_net();
> +		cancel_delayed_work_sync(&npinfo->tx_work);

Maybe we can avoid the sync_net and the comment by using
disable_delayed_work_sync() ?