linux-kernel - Re: [PATCH v4] can: m_can: don't enable transceiver when probing

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Message-ID: <20240621-witty-alluring-fossa-9e37f9-mkl@pengutronix.de>
Date: Fri, 21 Jun 2024 11:27:35 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Ratheesh Kannoth <rkannoth@...vell.com>
Cc: Martin Hundebøll <martin@...nix.com>, 
	Chandrasekar Ramakrishnan <rcsekar@...sung.com>, Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Markus Schneider-Pargmann <msp@...libre.com>, linux-can@...r.kernel.org, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] can: m_can: don't enable transceiver when probing

On 21.06.2024 14:49:08, Ratheesh Kannoth wrote:
> On 2024-06-07 at 16:22:08, Martin Hundebøll (martin@...nix.com) wrote:
> >
> > -		usleep_range(1, 5);
> > +	/* Then clear the it again. */
> > +	ret = m_can_cccr_update_bits(cdev, CCCR_NISO, 0);
> > +	if (ret) {
> > +		dev_err(cdev->dev, "failed to revert the NON-ISO bit in CCCR\n");
> > +		return ret;
> >  	}
> >
> > -	/* Clear NISO */
> > -	cccr_reg &= ~(CCCR_NISO);
> > -	m_can_write(cdev, M_CAN_CCCR, cccr_reg);
> > +	ret = m_can_config_disable(cdev);
> > +	if (ret)
> > +		return ret;

> if ret != 0, then the function returns "true", right ?
> as indicated by the below comment. But as i understand,
> this is an error case and should return "false"

AFAICS: This patch changes the return type to int. It Returns 1 if the
bit is writable, 0 if it is not, or negative on error. The caller has
been adopted, too.

Marc

> > -	/* return false if time out (-ETIMEDOUT), else return true */
> > -	return !niso_timeout;
> > +	return niso == 0;
> >  }
> >
> >
> 
> 

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