linux-kernel - Re: [PATCH] usb: musb: da8xx: Don't print phy error on -EPROBE

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Message-ID: <20161102214559.GA2338@localhost.localdomain>
Date:   Wed, 2 Nov 2016 22:45:59 +0100
From:   Ladislav Michl <ladis@...ux-mips.org>
To:     David Lechner <david@...hnology.com>
Cc:     Bin Liu <b-liu@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexandre Bailon <abailon@...libre.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: musb: da8xx: Don't print phy error on -EPROBE_DEFER

Hi,

On Tue, Oct 25, 2016 at 02:02:50PM -0500, David Lechner wrote:
> This suppresses printing the error message "failed to get phy" in the
> kernel log when the error is -EPROBE_DEFER. This prevents usless noise
> in the kernel log.
> 
> Signed-off-by: David Lechner <david@...hnology.com>
> ---
>  drivers/usb/musb/da8xx.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
> index 481d786..f8a1591 100644
> --- a/drivers/usb/musb/da8xx.c
> +++ b/drivers/usb/musb/da8xx.c
> @@ -516,7 +516,8 @@ static int da8xx_probe(struct platform_device *pdev)
>  
>  	glue->phy = devm_phy_get(&pdev->dev, "usb-phy");
>  	if (IS_ERR(glue->phy)) {
> -		dev_err(&pdev->dev, "failed to get phy\n");
> +		if (PTR_ERR(glue->phy) != -EPROBE_DEFER)
> +			dev_err(&pdev->dev, "failed to get phy\n");

What about something like this?

dev_printk(PTR_ERR(glue->phy) == -EPROBE_DEFER ? KERN_DEBUG : KERN_ERR, ...

At least it outputs something if debug is enabled, making debugging easier.

	ladis

>  		return PTR_ERR(glue->phy);
>  	}
>