linux-kernel - Re: [PATCH v3 13/13] can: slcan: extend the protocol with CAN state info

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Message-ID: <20220614072237.d6crkhtqmbgjlw4e@pengutronix.de>
Date:   Tue, 14 Jun 2022 09:22:37 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Dario Binacchi <dario.binacchi@...rulasolutions.com>
Cc:     linux-kernel@...r.kernel.org, michael@...rulasolutions.com,
        Amarula patchwork <linux-amarula@...rulasolutions.com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 13/13] can: slcan: extend the protocol with CAN state
 info

On 14.06.2022 08:29:57, Dario Binacchi wrote:
> > > +     cmd[SLC_STATE_BE_TXCNT_LEN] = 0;
> > > +     if (kstrtou32(cmd, 10, &txerr))
> > > +             return;
> > > +
> > > +     *cmd = 0;
> > > +     cmd -= SLC_STATE_BE_RXCNT_LEN;
> > > +     if (kstrtou32(cmd, 10, &rxerr))
> > > +             return;
> >
> > Why do you parse TX first and then RX?
> 
> Since adding the end-of-string character to the counter to be decoded
> invalidates the next one.
> If I had started from the rx counter, I would have found the
> transmission counter always at 0.

Thanks for the explanation.

regards,
Marc

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