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

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Date:   Fri, 20 May 2022 10:21:51 +0200
From:   Clément Léger <clement.leger@...tlin.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Pavel Skripkin <paskripkin@...il.com>,
        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

Le Thu, 19 May 2022 23:13:01 +0000,
Vladimir Oltean <vladimir.oltean@....com> a écrit :

> 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.

Hi Pavel,

Thanks for this fix which is indeed necessary.

Acked-by: Clément Léger <clement.leger@...tlin.com>


-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com