Subject: Re: [PATCH net v2] net: airoha: add RCU lock around dev_fill_forward_path

From: Lorenzo Bianconi <[email-masked]>
Date: Fri, 20 Mar 2026 10:54:38 +0100

> Since 0417adf367a0 ("ppp: fix race conditions in ppp_fill_forward_path")
> dev_fill_forward_path() should be called with RCU read lock held. This
> fix was applied to net, while the Airoha flowtable commit was applied to
> net-next, so it hadn't been an issue until net was merged into net-next.
> 
> Fixes: a8bdd935d1dd ("net: airoha: Add wlan flowtable TX offload")
> Signed-off-by: Qingfang Deng <[email-masked]>

My acked-by tag is still valid.

Acked-by: Lorenzo Bianconi <[email-masked]>

> ---
> v2: update fixes tag to the flowtable commit
>   - https://lore.kernel.org/netdev/[email-masked]/
> 
>  drivers/net/ethernet/airoha/airoha_ppe.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/airoha/airoha_ppe.c b/drivers/net/ethernet/airoha/airoha_ppe.c
> index ec5ce41dad80..02deb739a1c7 100644
> --- a/drivers/net/ethernet/airoha/airoha_ppe.c
> +++ b/drivers/net/ethernet/airoha/airoha_ppe.c
> @@ -227,7 +227,9 @@ static int airoha_ppe_get_wdma_info(struct net_device *dev, const u8 *addr,
>  	if (!dev)
>  		return -ENODEV;
>  
> +	rcu_read_lock();
>  	err = dev_fill_forward_path(dev, addr, &stack);
> +	rcu_read_unlock();
>  	if (err)
>  		return err;
>  
> -- 
> 2.43.0
>