linux-kernel - Re: [PATCH] usb: misc: usbtest: remove redundant check on retval

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Message-ID: <20170213094959.GA1483@b29397-desktop>
Date:   Mon, 13 Feb 2017 17:49:59 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Peter Chen <peter.chen@....com>,
        Alan Stern <stern@...land.harvard.edu>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        linux-usb@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: misc: usbtest: remove redundant check on retval < 0

On Sun, Feb 12, 2017 at 06:35:18PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The check for retval being less than zero is always true since
> retval equal to -EPIPE at that point.  Replace the existing
> conditional with just return retval.
> 
> Detected with CoverityScan, CID#114349 ("Logically dead code")
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/usb/misc/usbtest.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
> index 3525626..17c0810 100644
> --- a/drivers/usb/misc/usbtest.c
> +++ b/drivers/usb/misc/usbtest.c
> @@ -992,7 +992,7 @@ static int ch9_postconfig(struct usbtest_dev *dev)
>  				dev_err(&iface->dev,
>  						"hs dev qualifier --> %d\n",
>  						retval);
> -				return (retval < 0) ? retval : -EDOM;
> +				return retval;
>  			}
>  			/* usb2.0 but not high-speed capable; fine */
>  		} else if (retval != sizeof(struct usb_qualifier_descriptor)) {

Reviewed-by: Peter Chen <peter.chen@....com>

-- 

Best Regards,
Peter Chen