linux-kernel - Re: [PATCH][next] Input: qt1050: fix less than zero comparison on an unsigned int

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Message-ID: <20190507082744.GK2269@kadam>
Date:   Tue, 7 May 2019 11:27:44 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh@...nel.org>,
        Marco Felsch <m.felsch@...gutronix.de>,
        linux-input@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] Input: qt1050: fix less than zero comparison on an
 unsigned int

On Tue, May 07, 2019 at 09:21:35AM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the less than zero comparison of val is always false because
> val is an unsigned int. Fix this by making val a signed int.
> 
> Addresses-Coverity: ("Unsigned compared against zero")
> Fixes: a33ff45923c8 ("Input: qt1050 - add Microchip AT42QT1050 support")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/input/keyboard/qt1050.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/keyboard/qt1050.c b/drivers/input/keyboard/qt1050.c
> index 6b1603cb7515..4debddb13972 100644
> --- a/drivers/input/keyboard/qt1050.c
> +++ b/drivers/input/keyboard/qt1050.c
> @@ -222,7 +222,7 @@ static struct regmap_config qt1050_regmap_config = {
>  
>  static bool qt1050_identify(struct qt1050_priv *ts)
>  {
> -	unsigned int val;
> +	int val;

This code is checking the wrong thing anyway.  It should be:

	int ret;

	ret = regmap_read(&val);
	if (ret)
		return false;

regards,
dan carpenter