linux-kernel - Re: [PATCH] net: ocelot: fix wront time

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Message-ID: <20220519231300.k6hizfdu5chi7lpu@skbuf>
Date:   Thu, 19 May 2022 23:13:01 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Pavel Skripkin <paskripkin@...il.com>,
        Clément Léger <clement.leger@...tlin.com>
CC:     Claudiu Manoil <claudiu.manoil@....com>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: ocelot: fix wront time_after usage

On Thu, May 19, 2022 at 11:40:17PM +0300, Pavel Skripkin wrote:
> Accidentally noticed, that this driver is the only user of
> while (timer_after(jiffies...)).
> 
> It looks like typo, because likely this while loop will finish after 1st
> iteration, because time_after() returns true when 1st argument _is after_
> 2nd one.
> 
> Fix it by negating time_after return value inside while loops statement
> 
> Fixes: 753a026cfec1 ("net: ocelot: add FDMA support")
> Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
> ---
>  drivers/net/ethernet/mscc/ocelot_fdma.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mscc/ocelot_fdma.c b/drivers/net/ethernet/mscc/ocelot_fdma.c
> index dffa597bffe6..4500fed3ce5c 100644
> --- a/drivers/net/ethernet/mscc/ocelot_fdma.c
> +++ b/drivers/net/ethernet/mscc/ocelot_fdma.c
> @@ -104,7 +104,7 @@ static int ocelot_fdma_wait_chan_safe(struct ocelot *ocelot, int chan)
>  		safe = ocelot_fdma_readl(ocelot, MSCC_FDMA_CH_SAFE);
>  		if (safe & BIT(chan))
>  			return 0;
> -	} while (time_after(jiffies, timeout));
> +	} while (!time_after(jiffies, timeout));
>  
>  	return -ETIMEDOUT;
>  }
> -- 
> 2.36.1
>

+Clement. Also, there seems to be a typo in the commit message (wront -> wrong),
but maybe this isn't so important.