linux-kernel - Re: [PATCH][V2] pinctrl: actions: fix unsigned less than zero comparison

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Message-ID: <CACRpkda2CkPFRPcpHSukBNjH+m6szCxq6Cfs+uK5fLHthQmZkg@mail.gmail.com>
Date:   Mon, 2 Jul 2018 16:06:02 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Andreas Färber <afaerber@...e.de>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][V2] pinctrl: actions: fix unsigned less than zero comparison

On Mon, Jul 2, 2018 at 2:47 PM Colin King <colin.king@...onical.com> wrote:

> From: Colin Ian King <colin.king@...onical.com>
>
> The check to see if platform_get_irq failed is performed on the
> unsigned value of pctrl->irq[i] and the check is never true because
> an unsigned cannot be less than zero.  Fix this by assinging the
> signed int ret to the return of platform_get_irq and checking ret
> instead.
>
> Detected by CoverityScan, CID#1470247 ("Unsigned comparison against 0")
>
> Fixes: 6c5d0736e9c0 ("pinctrl: actions: Add interrupt support for OWL S900 SoC")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>
> V2: move pctrl->irq[i] = ret assignment below the check on ret, thanks
> to Manivannan Sadhasivam for suggesting this change.

Patch applied with Manivannan's ACK!

(Hope it's the right version now.)

Yours,
Linus Walleij