netdev - Re: [PATCH 2/4 v3 net-next] net: stmmac: adding multiple buffers for rx

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Date:   Thu, 6 Apr 2017 14:32:17 +0200
From:   Thierry Reding <treding@...dia.com>
To:     Joao Pinto <Joao.Pinto@...opsys.com>
CC:     <davem@...emloft.net>, <clabbe.montjoie@...il.com>,
        <niklas.cassel@...s.com>, <julia.lawall@...6.fr>,
        <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/4 v3 net-next] net: stmmac: adding multiple buffers for
 rx

On Thu, Apr 06, 2017 at 09:49:09AM +0100, Joao Pinto wrote:
[...]
>  err_init_rx_buffers:
> -	while (--i >= 0)
> -		stmmac_free_rx_buffer(priv, i);
> +	while (queue >= 0) {

I /think/ this could simply be:

	while (queue--) {
		...
	}

That evaluates before the decrement and hence properly deals with the
case of 0. The difference to your code is that it will skip the first
iteration, but I think that's fine because stmmac_init_rx_buffers()
already cleans up properly, so the queue'th element doesn't have to
be freed again.

Anyway, I think your version will work just as well.

Thierry

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