linux-kernel - Re: [PATCH v4] can: Convert to runtime

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Date:	Tue, 23 Dec 2014 14:43:08 -0800
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Kedareswara rao Appana <appana.durga.rao@...inx.com>
CC:	<wg@...ndegger.com>, <mkl@...gutronix.de>,
	<michal.simek@...inx.com>, <grant.likely@...aro.org>,
	<linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	Kedareswara rao Appana <appanad@...inx.com>
Subject: Re: [PATCH v4] can: Convert to runtime_pm

On Tue, 2014-12-23 at 05:55PM +0530, Kedareswara rao Appana wrote:
> Instead of enabling/disabling clocks at several locations in the driver,
> use the runtime_pm framework. This consolidates the actions for
> runtime PM in the appropriate callbacks and makes the driver more
> readable and mantainable.
> 
> Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
> ---
> Chnages for v4:
>  - Updated with the review comments.
> Changes for v3:
>   - Converted the driver to use runtime_pm.
> Changes for v2:
>   - Removed the struct platform_device* from suspend/resume
>     as suggest by Lothar.
> 
>  drivers/net/can/xilinx_can.c |  123 +++++++++++++++++++++++++-----------------
>  1 files changed, 74 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
> index 6c67643..c71f683 100644
> --- a/drivers/net/can/xilinx_can.c
> +++ b/drivers/net/can/xilinx_can.c
> @@ -32,6 +32,7 @@
>  #include <linux/can/dev.h>
>  #include <linux/can/error.h>
>  #include <linux/can/led.h>
> +#include <linux/pm_runtime.h>
>  
>  #define DRIVER_NAME	"xilinx_can"
>  
> @@ -138,7 +139,7 @@ struct xcan_priv {
>  	u32 (*read_reg)(const struct xcan_priv *priv, enum xcan_reg reg);
>  	void (*write_reg)(const struct xcan_priv *priv, enum xcan_reg reg,
>  			u32 val);
> -	struct net_device *dev;
> +	struct device *dev;
>  	void __iomem *reg_base;
>  	unsigned long irq_flags;
>  	struct clk *bus_clk;
> @@ -842,6 +843,13 @@ static int xcan_open(struct net_device *ndev)
>  	struct xcan_priv *priv = netdev_priv(ndev);
>  	int ret;
>  
> +	ret = pm_runtime_get_sync(priv->dev);
> +	if (ret < 0) {
> +		netdev_err(ndev, "%s: pm_runtime_get failed\r(%d)\n\r",

Does this create the intended output? I haven't seen '\r' anywhere else.
Shouldn't this simply be:
	netdev_err(ndev, "%s: pm_runtime_get failed (%d)\n",

[...]
> @@ -934,27 +927,20 @@ static int xcan_get_berr_counter(const struct net_device *ndev,
>  	struct xcan_priv *priv = netdev_priv(ndev);
>  	int ret;
>  
> -	ret = clk_prepare_enable(priv->can_clk);
> -	if (ret)
> -		goto err;
> -
> -	ret = clk_prepare_enable(priv->bus_clk);
> -	if (ret)
> -		goto err_clk;
> +	ret = pm_runtime_get_sync(priv->dev);
> +	if (ret < 0) {
> +		netdev_err(ndev, "%s: pm_runtime_get failed\r(%d)\n\r",

ditto

	Sören
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