netdev - Re: [PATCH] can: mcba_usb: Fix termination command argument

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Date:   Thu, 24 Nov 2022 18:52:14 +0900
From:   Yasushi SHOJI <yasushi.shoji@...il.com>
To:     Vincent Mailhol <vincent.mailhol@...il.com>
Cc:     Yasushi SHOJI <yashi@...cecubics.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] can: mcba_usb: Fix termination command argument

On Thu, Nov 24, 2022 at 9:53 AM Vincent Mailhol
<vincent.mailhol@...il.com> wrote:
> > diff --git a/drivers/net/can/usb/mcba_usb.c b/drivers/net/can/usb/mcba_usb.c
> > index 218b098b261d..67beff1a3876 100644
> > --- a/drivers/net/can/usb/mcba_usb.c
> > +++ b/drivers/net/can/usb/mcba_usb.c
> > @@ -785,9 +785,9 @@ static int mcba_set_termination(struct net_device *netdev, u16 term)
> >         };
> >
> >         if (term == MCBA_TERMINATION_ENABLED)
> > -               usb_msg.termination = 1;
> > -       else
> >                 usb_msg.termination = 0;
> > +       else
> > +               usb_msg.termination = 1;
> >
> >         mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
>
> Nitpick: does it make sense to rename the field to something like
> usb_msg.termination_disable or usb_msg.termination_off? This would
> make it more explicit that this is a "reverse" boolean.

I'd rather define the values like

#define TERMINATION_ON (0)
#define TERMINATION_OFF (1)

So the block becomes

if (term == MCBA_TERMINATION_ENABLED)
    usb_msg.termination = TERMINATION_ON;
else
    usb_msg.termination = TERMINATION_OFF;
--
             yashi