Re: [PATCH net v2] net: ntb_netdev: Fix statistics races

[Jakub Kicinski]

On Sat, 29 Aug 2026 00:41:22 +0900 Koichiro Den wrote:
> Note that transport callbacks may still complete after
> unregister_netdev(), so tie the tstats lifetime to the client device.

We shouldn't really call devm_netdev_alloc_pcpu_stats() for types
of stats declared by netdev core. We should set the pointer type
like you did in v1.

Could you instead fix the fact that the Tx callback runs on 
an unregistered device? Maybe just wrap the whole body of
ntb_netdev_tx_handler() in RCU and check 

	READ_ONCE(ndev->reg_state) == NETREG_REGISTERED

?