netdev - Re: [PATCH v2] can: ti_hecc: add missing prepare and unprepare of the clock

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Date:   Wed, 18 Jan 2017 13:03:55 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     yegorslists@...glemail.com, linux-can@...r.kernel.org
Cc:     netdev@...r.kernel.org, wg@...ndegger.com
Subject: Re: [PATCH v2] can: ti_hecc: add missing prepare and unprepare of the
 clock

On 01/18/2017 11:35 AM, yegorslists@...glemail.com wrote:
> From: Yegor Yefremov <yegorslists@...glemail.com>
> 
> In order to make the driver work with the common clock framework, this
> patch converts the clk_enable()/clk_disable() to
> clk_prepare_enable()/clk_disable_unprepare().
> 
> Also add error checking for clk_prepare_enable().
> 
> Signed-off-by: Yegor Yefremov <yegorslists@...glemail.com>
> ---
> Changes v1 -> v2:
> 	- add error checking for clk_prepare_enable (Marc Kleine-Budde)
> 
>  drivers/net/can/ti_hecc.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
> index 680d1ff..8771531 100644
> --- a/drivers/net/can/ti_hecc.c
> +++ b/drivers/net/can/ti_hecc.c
> @@ -948,7 +948,12 @@ static int ti_hecc_probe(struct platform_device *pdev)
>  	netif_napi_add(ndev, &priv->napi, ti_hecc_rx_poll,
>  		HECC_DEF_NAPI_WEIGHT);
>  
> -	clk_enable(priv->clk);
> +	err = clk_prepare_enable(priv->clk);
> +	if (err) {
> +		dev_err(&pdev->dev, "clk_prepare_enable() failed\n");
> +		goto probe_exit_clk;
> +	}
> +
>  	err = register_candev(ndev);
>  	if (err) {
>  		dev_err(&pdev->dev, "register_candev() failed\n");
> @@ -981,7 +986,7 @@ static int ti_hecc_remove(struct platform_device *pdev)
>  	struct ti_hecc_priv *priv = netdev_priv(ndev);
>  
>  	unregister_candev(ndev);
> -	clk_disable(priv->clk);
> +	clk_disable_unprepare(priv->clk);
>  	clk_put(priv->clk);
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	iounmap(priv->base);
> @@ -1006,7 +1011,7 @@ static int ti_hecc_suspend(struct platform_device *pdev, pm_message_t state)
>  	hecc_set_bit(priv, HECC_CANMC, HECC_CANMC_PDR);
>  	priv->can.state = CAN_STATE_SLEEPING;
>  
> -	clk_disable(priv->clk);
> +	clk_disable_unprepare(priv->clk);
>  
>  	return 0;
>  }
> @@ -1016,7 +1021,7 @@ static int ti_hecc_resume(struct platform_device *pdev)
>  	struct net_device *dev = platform_get_drvdata(pdev);
>  	struct ti_hecc_priv *priv = netdev_priv(dev);
>  
> -	clk_enable(priv->clk);
> +	clk_prepare_enable(priv->clk);

I've added error checking here, too.

>  
>  	hecc_clear_bit(priv, HECC_CANMC, HECC_CANMC_PDR);
>  	priv->can.state = CAN_STATE_ERROR_ACTIVE;
> 

Applied to can.

Tnx,
Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |



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