linux-kernel - Re: [PATCH] usb: phy: Quiet unable to find transceiver message

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Date:	Sat, 25 Jan 2014 10:37:37 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Josh Boyer <jwboyer@...oraproject.org>
cc:	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<valentine.barshak@...entembedded.com>
Subject: Re: [PATCH] usb: phy: Quiet unable to find transceiver message

On Sat, 25 Jan 2014, Josh Boyer wrote:

> commit 1ae5799ef6317 ("usb: hcd: Initialize USB phy if needed") allows
> the USB layer to initialize external PHYs if needed.  However, a PHY is
> not needed in all cases.  The usb_get_phy_device function will print
> an error message, "unable to find transceiver" but everything still
> functions normally.
> 
> Drop the severity of this message to pr_debug.
> 
> Signed-off-by: Josh Boyer <jwboyer@...oraproject.org>
> ---
>  drivers/usb/phy/phy.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/phy/phy.c b/drivers/usb/phy/phy.c
> index e6f61e4..c7fe880 100644
> --- a/drivers/usb/phy/phy.c
> +++ b/drivers/usb/phy/phy.c
> @@ -228,7 +228,7 @@ struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index)
>  
>  	phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
>  	if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
> -		pr_err("unable to find transceiver\n");
> +		pr_debug("unable to find transceiver\n");
>  		goto err0;
>  	}

Wouldn't it make more sense to change this to dev_debug?  As it stands, 
the user has no idea which device is lacking a transceiver.

(The same is probably true for other log messages in this source file.)

Alan Stern

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