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

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Message-ID: <ffc33c9f-191a-d19c-8aaa-b18519dd25af@canonical.com>
Date:   Mon, 13 Feb 2017 16:44:06 +0000
From:   Colin Ian King <colin.king@...onical.com>
To:     Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: misc: usbtest: remove redundant check on retval < 0

On 13/02/17 10:45, Felipe Balbi wrote:
> 
> Hi,
> 
> Colin King <colin.king@...onical.com> writes:
>> 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;
> 
> you're changing return value here, are you sure there's nothing else
> depending on this error?
> 
The code in the current state will never return -EDOM and will always
return retval, so this change actually makes no functional change, it
just removes a redundant check.  So it's not going to make a jot of
difference to the current behaver.



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