linux-kernel - Re: [PATCH -next] drm: bridge: fix wrong pointer passed to PTR

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Message-ID: <CAG3jFytWqa9CwPto4Q1b5wZvHkviLgtY_pqYWyVCa5Trx0otwg@mail.gmail.com>
Date:   Mon, 17 May 2021 11:01:13 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Qiheng Lin <linqiheng@...wei.com>
Cc:     Phong LE <ple@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org, Hulk Robot <hulkci@...wei.com>
Subject: Re: [PATCH -next] drm: bridge: fix wrong pointer passed to PTR_ERR()

Hey Qiheng,

Thanks for submitting this bugfix.

The title of this patch should probably be:
drm: bridge: it66121: fix wrong pointer passed to PTR_ERR()

With this fixed, feel free to add my r-b.
Reviewed-by: Robert Foss <robert.foss@...aro.org>


On Fri, 14 May 2021 at 09:03, Qiheng Lin <linqiheng@...wei.com> wrote:
>
> PTR_ERR should access the value just tested by IS_ERR, otherwise
> the wrong error code will be returned.
>
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Qiheng Lin <linqiheng@...wei.com>
> ---
>  drivers/gpu/drm/bridge/ite-it66121.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
> index d8a60691fd32..6980c9801d0d 100644
> --- a/drivers/gpu/drm/bridge/ite-it66121.c
> +++ b/drivers/gpu/drm/bridge/ite-it66121.c
> @@ -943,7 +943,7 @@ static int it66121_probe(struct i2c_client *client,
>         ctx->regmap = devm_regmap_init_i2c(client, &it66121_regmap_config);
>         if (IS_ERR(ctx->regmap)) {
>                 ite66121_power_off(ctx);
> -               return PTR_ERR(ctx);
> +               return PTR_ERR(ctx->regmap);
>         }
>
>         regmap_read(ctx->regmap, IT66121_VENDOR_ID0_REG, &vendor_ids[0]);
>