netdev - Re: [PATCH 6/8] net: sfc: use skb_list_walk

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Date:   Tue, 18 Feb 2020 15:34:46 +0000
From:   Edward Cree <ecree@...arflare.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
CC:     <netdev@...r.kernel.org>
Subject: Re: [PATCH 6/8] net: sfc: use skb_list_walk_safe helper for gso
 segments

On 08/01/2020 21:59, Jason A. Donenfeld wrote:
> This is a straight-forward conversion case for the new function, and
> while we're at it, we can remove a null write to skb->next by replacing
> it with skb_mark_not_on_list.
>
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---
>  drivers/net/ethernet/sfc/tx.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c
> index 00c1c4402451..547692b33b4d 100644
> --- a/drivers/net/ethernet/sfc/tx.c
> +++ b/drivers/net/ethernet/sfc/tx.c
> @@ -473,12 +473,9 @@ static int efx_tx_tso_fallback(struct efx_tx_queue *tx_queue,
>  	dev_consume_skb_any(skb);
>  	skb = segments;
>  
> -	while (skb) {
> -		next = skb->next;
> -		skb->next = NULL;
> -
> +	skb_list_walk_safe(skb, skb, next) {
Could this be replaced with
    skb_list_walk_safe(segments, skb, next) {
and elide the assignment just above?
Or is there some reason I'm missing not to do that?
-ed
> +		skb_mark_not_on_list(skb);
>  		efx_enqueue_skb(tx_queue, skb);
> -		skb = next;
>  	}
>  
>  	return 0;