netdev - Re: [PATCH net] net: stmmac: Premature loop termination check was ignored

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Date:   Tue, 21 Feb 2023 17:41:25 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Jochen Henneberg <jh@...neberg-systemdesign.com>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: stmmac: Premature loop termination check was
 ignored

On Tue, Feb 21, 2023 at 02:38:27PM +0100, Jochen Henneberg wrote:
> 
> The premature loop termination check makes sense only in case of the
> jump to read_again where the count may have been updated. But
> read_again did not include the check.

I think a fixes tag appropriate here.

> Signed-off-by: Jochen Henneberg <jh@...neberg-systemdesign.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Code change makes sense to me.

> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 1a5b8dab5e9b..de98c009866a 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -5031,10 +5031,10 @@ static int stmmac_rx_zc(struct stmmac_priv *priv, int limit, u32 queue)
>  			len = 0;
>  		}
>  
> +read_again:
>  		if (count >= limit)
>  			break;
>  
> -read_again:
>  		buf1_len = 0;
>  		entry = next_entry;
>  		buf = &rx_q->buf_pool[entry];
> @@ -5221,10 +5221,10 @@ static int stmmac_rx(struct stmmac_priv *priv, int limit, u32 queue)
>  			len = 0;
>  		}
>  
> +read_again:
>  		if (count >= limit)
>  			break;
>  
> -read_again:
>  		buf1_len = 0;
>  		buf2_len = 0;
>  		entry = next_entry;
> -- 
> 2.39.2
>