netdev - Re: [PATCH] can: xilinx CAN controller support.

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Date:	Mon, 17 Feb 2014 10:42:46 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Kedareswara rao Appana <appana.durga.rao@...inx.com>,
	wg@...ndegger.com, michal.simek@...inx.com,
	grant.likely@...aro.org, robh+dt@...nel.org,
	linux-can@...r.kernel.org
CC:	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Kedareswara rao Appana <appanad@...inx.com>
Subject: Re: [PATCH] can: xilinx CAN controller support.

On 02/17/2014 10:23 AM, Kedareswara rao Appana wrote:
> +/**
> + * xcan_get_berr_counter - error counter routine
> + * @ndev:	Pointer to net_device structure
> + * @bec:	Pointer to can_berr_counter structure
> + *
> + * This is the driver error counter routine.
> + * Return: 0 always
> + */
> +static int xcan_get_berr_counter(const struct net_device *ndev,
> +					struct can_berr_counter *bec)
> +{
> +	struct xcan_priv *priv = netdev_priv(ndev);
> +	int ret;
> +
> +	ret = clk_prepare_enable(priv->devclk);
> +	if (ret)
> +		goto err;
> +
> +	ret = clk_prepare_enable(priv->aperclk);
> +	if (ret)
> +		goto err_clk;
> +
> +	bec->txerr = priv->read_reg(priv, XCAN_ECR_OFFSET) & XCAN_ECR_TEC_MASK;
> +	bec->rxerr = ((priv->read_reg(priv, XCAN_ECR_OFFSET) &
> +			XCAN_ECR_REC_MASK) >> XCAN_ESR_REC_SHIFT);

You have to disable the clock when leaving this function. Otherwise the
clocks will be unbalanced.

> +	return 0;
> +
> +err_clk:
> +	clk_disable_unprepare(priv->devclk);
> +err:
> +	return ret;
> +}

Marc

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