linux-kernel - Re: [PATCH] pinctrl: paris: fix check on EINT

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Date:   Tue, 25 Sep 2018 17:58:21 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Sean Wang <sean.wang@...iatek.com>, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pinctrl: paris: fix check on EINT_NA comparison

On Tue, Sep 25, 2018 at 02:21:30PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently, the check on desc->eint.eint_n == EINT_NA is always false
> because this is comparing a u16 to -1 which can never be true.  Fix
> this by casting EINT_NA to u16.
> 
> Fixes: fb5fa8dc151b ("pinctrl: mediatek: extend struct mtk_pin_desc to pinctrl-mtk-common-v2.c")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/pinctrl/mediatek/pinctrl-paris.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
> index 4cf0fea30b7d..77d380145dfd 100644
> --- a/drivers/pinctrl/mediatek/pinctrl-paris.c
> +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
> @@ -729,7 +729,7 @@ static int mtk_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
>  
>  	desc = (const struct mtk_pin_desc *)&hw->soc->pins[offset];
>  
> -	if (desc->eint.eint_n == EINT_NA)
> +	if (desc->eint.eint_n == (u16)EINT_NA)

Adding casts is ugly...  I reported this earlier and think Sean Wang is
going to send a fix for it.

regards,
dan carpenter