linux-kernel - Re: [PATCH v2 01/21] usb: phy: use match

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Date:   Thu, 31 May 2018 19:55:10 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Yisheng Xie <xieyisheng1@...wei.com>, linux-kernel@...r.kernel.org
Cc:     andy.shevchenko@...il.com, linux-usb@...r.kernel.org,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2 01/21] usb: phy: use match_string() helper

Hello!

On 05/31/2018 02:11 PM, Yisheng Xie wrote:

> match_string() returns the index of an array for a matching string,
> which can be used instead of open coded variant.
> 
> Cc: linux-usb@...r.kernel.org
> Cc: Felipe Balbi <balbi@...nel.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
> ---
> v2:
>  - donot rename err to ret  - per Andy

   Hm...

> 
>  drivers/usb/phy/of.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/usb/phy/of.c b/drivers/usb/phy/of.c
> index 1ab134f..9d74081 100644
> --- a/drivers/usb/phy/of.c
> +++ b/drivers/usb/phy/of.c
> @@ -28,16 +28,16 @@
>  enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np)
>  {
>  	const char *phy_type;
> -	int err, i;
> +	int err;
>  
>  	err = of_property_read_string(np, "phy_type", &phy_type);
>  	if (err < 0)
>  		return USBPHY_INTERFACE_MODE_UNKNOWN;
>  
> -	for (i = 0; i < ARRAY_SIZE(usbphy_modes); i++)
> -		if (!strcmp(phy_type, usbphy_modes[i]))
> -			return i;
> +	err = match_string(usbphy_modes, ARRAY_SIZE(usbphy_modes), phy_type);
> +	if (err < 0)

   This is one of the few cases when 'err' is not the best name for such a
variable. I'd prefer to see something like 'match' or even 'rc' or 'ret'... :-)

> +		return USBPHY_INTERFACE_MODE_UNKNOWN;
>  
> -	return USBPHY_INTERFACE_MODE_UNKNOWN;
> +	return err;
>  }
>  EXPORT_SYMBOL_GPL(of_usb_get_phy_mode);
> 

MBR, Sergei