linux-kernel - Re: [PATCH][V2] pinctrl: ti-iodelay: remove redundant pin

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Message-ID: <7cc8f5f0-7899-ca16-2bbb-8869abfda650@canonical.com>
Date:   Mon, 16 Jan 2017 15:52:04 +0000
From:   Colin Ian King <colin.king@...onical.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Nishanth Menon <nm@...com>, Lokesh Vutla <lokeshvutla@...com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][V2] pinctrl: ti-iodelay: remove redundant pin < 0 check
 on unsigned int

On 16/01/17 15:45, Rob Herring wrote:
> On Fri, Jan 13, 2017 at 3:06 PM, Colin King <colin.king@...onical.com> wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> pin is an unsigned int and therefore can never be < 0 so
>> this check is redundant. Remove the check and the associated
>> dev_err error message.
> 
> Not sure why I got copied on this...
> 
>> Fixes CoverityScan CID#1396438 ("Unsigned compared against 0")
>>
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  drivers/pinctrl/ti/pinctrl-ti-iodelay.c | 6 ------
> 
> This file doesn't exist in mainline.
> 
>>  1 file changed, 6 deletions(-)
>>
>> diff --git a/drivers/pinctrl/ti/pinctrl-ti-iodelay.c b/drivers/pinctrl/ti/pinctrl-ti-iodelay.c
>> index 3b86d3d..a345166 100644
>> --- a/drivers/pinctrl/ti/pinctrl-ti-iodelay.c
>> +++ b/drivers/pinctrl/ti/pinctrl-ti-iodelay.c
>> @@ -665,12 +665,6 @@ static void ti_iodelay_pin_dbg_show(struct pinctrl_dev *pctldev,
>>         r = iod->reg_data;
>>
>>         offset = ti_iodelay_pin_to_offset(iod, pin);
>> -       if (pin < 0) {
> 
> Shouldn't this be "if (offset < 0)"?

Yep. However if the code was correct and using offset:

	if (offset < 0) {
		...
	
then we still get the same issue, that is, offset is unsigned so that
comparison is redundant since it can't be < 0.  Perhaps I should re-send
a V3 with an updated commit message.


> 
> 
>> -               dev_err(iod->dev, "invalid pin offset for pin%i\n", pin);
>> -
>> -               return;
>> -       }
>> -
>>         pd = &iod->pa[pin];
>>         cfg = pd->drv_data;
>>
>> --
>> 2.10.2
>>