netdev - Re: [PATCH net-next 18/29] can: pch_can: do not report txerr and rxerr during bus-off

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Date:   Thu, 21 Jul 2022 17:47:25 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        linux-can@...r.kernel.org, kernel@...gutronix.de,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        llvm@...ts.linux.dev
Subject: Re: [PATCH net-next 18/29] can: pch_can: do not report txerr and
 rxerr during bus-off

On 21.07.2022 08:27:06, Nathan Chancellor wrote:
> On Wed, Jul 20, 2022 at 10:10:23AM +0200, Marc Kleine-Budde wrote:
> > From: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> > 
> > During bus off, the error count is greater than 255 and can not fit in
> > a u8.
> > 
> > Fixes: 0c78ab76a05c ("pch_can: Add setting TEC/REC statistics processing")
> > Link: https://lore.kernel.org/all/20220719143550.3681-2-mailhol.vincent@wanadoo.fr
> > Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> > Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
> > ---
> >  drivers/net/can/pch_can.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
> > index fde3ac516d26..497ef77340ea 100644
> > --- a/drivers/net/can/pch_can.c
> > +++ b/drivers/net/can/pch_can.c
> > @@ -496,6 +496,9 @@ static void pch_can_error(struct net_device *ndev, u32 status)
> >  		cf->can_id |= CAN_ERR_BUSOFF;
> >  		priv->can.can_stats.bus_off++;
> >  		can_bus_off(ndev);
> > +	} else {
> > +		cf->data[6] = errc & PCH_TEC;
> > +		cf->data[7] = (errc & PCH_REC) >> 8;
> >  	}
> >  
> >  	errc = ioread32(&priv->regs->errc);
> > @@ -556,9 +559,6 @@ static void pch_can_error(struct net_device *ndev, u32 status)
> >  		break;
> >  	}
> >  
> > -	cf->data[6] = errc & PCH_TEC;
> > -	cf->data[7] = (errc & PCH_REC) >> 8;
> > -
> >  	priv->can.state = state;
> >  	netif_receive_skb(skb);
> >  }
> > -- 
> > 2.35.1
> > 
> > 
> > 
> 
> Apologies if this has been reported already, I didn't see anything on
> the mailing lists.
> 
> This commit is now in -next as commit 3a5c7e4611dd ("can: pch_can: do
> not report txerr and rxerr during bus-off"), where it causes the
> following clang warning:
> 
>   ../drivers/net/can/pch_can.c:501:17: error: variable 'errc' is uninitialized when used here [-Werror,-Wuninitialized]
>                   cf->data[6] = errc & PCH_TEC;
>                                 ^~~~
>   ../drivers/net/can/pch_can.c:484:10: note: initialize the variable 'errc' to silence this warning
>           u32 errc, lec;
>                   ^
>                    = 0
>   1 error generated.
> 
> errc is initialized underneath this now, should it be hoisted or is
> there another fix?

Doh! I'll send a fix.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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