linux-kernel - Re: [PATCH 1/2] can: xilinx_can: skip error message on deferred probe

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Date:   Fri, 22 Nov 2019 15:28:04 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Srinivas Neeli <srinivas.neeli@...inx.com>, wg@...ndegger.com,
        davem@...emloft.net, michal.simek@...inx.com, appanad@...inx.com
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        git@...inx.com, nagasure@...inx.com,
        Venkatesh Yadav Abbarapu <venkatesh.abbarapu@...inx.com>,
        Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>
Subject: Re: [PATCH 1/2] can: xilinx_can: skip error message on deferred probe

On 11/20/19 1:11 PM, Srinivas Neeli wrote:
> From: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@...inx.com>
> 
> When can clock is provided from the clock wizard, clock wizard driver
       ^^^

The code looks like the "bus" clock is probed here, not the "can" clock.

> may not be available when can driver probes resulting to the error
> message "bus clock not found error".
> 
> As this error message is not very useful to the end user, skip printing
> in the case of deferred probe.
> 
> Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@...inx.com>
> Signed-off-by: Srinivas Neeli <srinivas.neeli@...inx.com>
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
>  drivers/net/can/xilinx_can.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
> index 4a96e2dd7d77..c5f05b994435 100644
> --- a/drivers/net/can/xilinx_can.c
> +++ b/drivers/net/can/xilinx_can.c
> @@ -1772,7 +1772,8 @@ static int xcan_probe(struct platform_device *pdev)
>  
>  	priv->bus_clk = devm_clk_get(&pdev->dev, devtype->bus_clk_name);
              ^^^^^^^
>  	if (IS_ERR(priv->bus_clk)) {
> -		dev_err(&pdev->dev, "bus clock not found\n");
> +		if (PTR_ERR(priv->bus_clk) != -EPROBE_DEFER)
> +			dev_err(&pdev->dev, "bus clock not found\n");
>  		ret = PTR_ERR(priv->bus_clk);
>  		goto err_free;
>  	}
> 

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
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Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |



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