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

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Date: Fri, 21 Jun 2024 14:49:08 +0530
From: Ratheesh Kannoth <rkannoth@...vell.com>
To: Martin Hundebøll <martin@...nix.com>
CC: Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Marc Kleine-Budde
	<mkl@...gutronix.de>,
        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 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"
> -	/* return false if time out (-ETIMEDOUT), else return true */
> -	return !niso_timeout;
> +	return niso == 0;
>  }
>
>