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From:   Sean Wang <sean.wang@kernel.org>
Date:   Tue, 27 Nov 2018 12:38:29 -0800
Message-ID: <CAGp9Lzp=D72LZCk-h5XU9V2DePLHKTRCmioKEjZRjHGW6P_y6g@mail.gmail.com>
Subject: Re: [PATCH V2] gpio: mt7621: pass mediatek_gpio_bank_probe() failure
 up the stack
To:     hofrat@osadl.org
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        sergio.paracuellos@gmail.com, linux-gpio@vger.kernel.org,
        linux-kernel@vger.kernel.org, bgolaszewski@baylibre.com,
        linux-mediatek@lists.infradead.org,
        Matthias Brugger <matthias.bgg@gmail.com>,
        linux-arm-kernel@lists.infradead.org
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Nicholas Mc Guire <hofrat@osadl.org> =E6=96=BC 2018=E5=B9=B411=E6=9C=8827=
=E6=97=A5 =E9=80=B1=E4=BA=8C =E4=B8=8A=E5=8D=889:07=E5=AF=AB=E9=81=93=EF=BC=
=9A
>
> The error cases of mediatek_gpio_bank_probe() would go unnoticed (except
> for the dev_err() messages). The probe function should return an error
> if one of the banks failed to initialize properly indicated by
> not returning non-0.
>
> Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>

Acked-by: Sean Wang <sean.wang@kernel.org>

> Fixes: 4ba9c3afda41 ("gpio: mt7621: Add a driver for MT7621")
> ---
>
> V2: A logic error spoted by Sean Wang <sean.wang@kernel.org> the
>     success case is 0 and thus returning early should be on on
>     ret!=3D0 and not on !ret - thanks for catching this stupid mistake !
>
> Patch was compile tested with: omega2p_defconfig, SOC_MT7621=3Dy,
> GPIOLIB=3Dy, GPIO_MT7621=3Dy
>
> Patch is against 4.20-rc3 (localversion-next is next-20181121)
>
>  drivers/gpio/gpio-mt7621.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpio/gpio-mt7621.c b/drivers/gpio/gpio-mt7621.c
> index 1ec95bc..68fca8b 100644
> --- a/drivers/gpio/gpio-mt7621.c
> +++ b/drivers/gpio/gpio-mt7621.c
> @@ -297,6 +297,7 @@ mediatek_gpio_probe(struct platform_device *pdev)
>         struct device_node *np =3D dev->of_node;
>         struct mtk *mtk;
>         int i;
> +       int ret;
>
>         mtk =3D devm_kzalloc(dev, sizeof(*mtk), GFP_KERNEL);
>         if (!mtk)
> @@ -311,8 +312,11 @@ mediatek_gpio_probe(struct platform_device *pdev)
>         platform_set_drvdata(pdev, mtk);
>         mediatek_gpio_irq_chip.name =3D dev_name(dev);
>
> -       for (i =3D 0; i < MTK_BANK_CNT; i++)
> -               mediatek_gpio_bank_probe(dev, np, i);
> +       for (i =3D 0; i < MTK_BANK_CNT; i++) {
> +               ret =3D mediatek_gpio_bank_probe(dev, np, i);
> +               if (ret)
> +                       return ret;
> +       }
>
>         return 0;
>  }
> --
> 2.1.4
>
>
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