netdev - Re: [PATCH v2] can: m_can: Fix runtime resume call

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Message-ID: <6af0c052-b349-967a-c86c-370aba374318@ti.com>
Date:   Tue, 10 Jul 2018 17:06:54 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-can@...r.kernel.org>, <linux-omap@...r.kernel.org>
CC:     <wg@...ndegger.com>, <mkl@...gutronix.de>, <davem@...emloft.net>
Subject: Re: [PATCH v2] can: m_can: Fix runtime resume call

Hi,

On Tuesday 03 July 2018 04:41 PM, Faiz Abbas wrote:
> pm_runtime_get_sync() returns a 1 if the state of the device is already
> 'active'. This is not a failure case and should return a success.
> 
> Therefore fix error handling for pm_runtime_get_sync() call such that
> it returns success when the value is 1.
> 
> Also cleanup the TODO for using runtime PM for sleep mode as that is
> implemented.
> 
> Signed-off-by: Faiz Abbas <faiz_abbas@...com>
> ---
> 
> Changes in v2:
> 
> rebased to latest mainline
> 
>  drivers/net/can/m_can/m_can.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
> index b397a33f3d32..ac4c6dc2f8c8 100644
> --- a/drivers/net/can/m_can/m_can.c
> +++ b/drivers/net/can/m_can/m_can.c
> @@ -634,10 +634,12 @@ static int m_can_clk_start(struct m_can_priv *priv)
>  	int err;
>  
>  	err = pm_runtime_get_sync(priv->device);
> -	if (err)
> +	if (err < 0) {
>  		pm_runtime_put_noidle(priv->device);
> +		return err;
> +	}
>  
> -	return err;
> +	return 0;
>  }
>  
>  static void m_can_clk_stop(struct m_can_priv *priv)
> @@ -1687,8 +1689,6 @@ static int m_can_plat_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> -/* TODO: runtime PM with power down or sleep mode  */
> -
>  static __maybe_unused int m_can_suspend(struct device *dev)
>  {
>  	struct net_device *ndev = dev_get_drvdata(dev);
> 

Gentle ping.

Thanks,
Faiz