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References: <20200427075238.2828-1-bernard@vivo.com>
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From:   Chun-Kuang Hu <chunkuang.hu@kernel.org>
Date:   Wed, 29 Apr 2020 22:22:50 +0800
Message-ID: <CAAOTY_86d-UryKQrLy8-zjTbrTRrHL4k3x=bx1KqvWxPL5jj2Q@mail.gmail.com>
Subject: Re: [PATCH] drm/mediatek: cleanup coding style in mediatek a bit
To:     Bernard Zhao <bernard@vivo.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@kernel.org>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        DRI Development <dri-devel@lists.freedesktop.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@lists.infradead.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        opensource.kernel@vivo.com
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Hi, Bernard:

Bernard Zhao <bernard@vivo.com> =E6=96=BC 2020=E5=B9=B44=E6=9C=8827=E6=97=
=A5 =E9=80=B1=E4=B8=80 =E4=B8=8B=E5=8D=883:53=E5=AF=AB=E9=81=93=EF=BC=9A
>
> This code change is to make code bit more readable.
> Optimise array size align to HDMI macro define.
> Add check if len is overange.

One patch should just do one thing, but this do three things.
So break this into three patches.

Regards,
Chun-Kuang.

>
> Signed-off-by: Bernard Zhao <bernard@vivo.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 22 +++++++++++-----------
>  1 file changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediat=
ek/mtk_hdmi.c
> index ff43a3d80410..40fb5154ed5d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -311,15 +311,15 @@ static void mtk_hdmi_hw_send_info_frame(struct mtk_=
hdmi *hdmi, u8 *buffer,
>         u8 checksum;
>         int ctrl_frame_en =3D 0;
>
> -       frame_type =3D *buffer;
> -       buffer +=3D 1;
> -       frame_ver =3D *buffer;
> -       buffer +=3D 1;
> -       frame_len =3D *buffer;
> -       buffer +=3D 1;
> -       checksum =3D *buffer;
> -       buffer +=3D 1;
> +       frame_type =3D *buffer++;
> +       frame_ver =3D *buffer++;
> +       frame_len =3D *buffer++;
> +       checksum =3D *buffer++;
>         frame_data =3D buffer;
> +       if ((frame_len + HDMI_INFOFRAME_HEADER_SIZE) > len) {
> +               dev_err(hdmi->dev, "Wrong frame len: %d\n", frame_len;
> +               return;
> +       }
>
>         dev_dbg(hdmi->dev,
>                 "frame_type:0x%x,frame_ver:0x%x,frame_len:0x%x,checksum:0=
x%x\n",
> @@ -982,7 +982,7 @@ static int mtk_hdmi_setup_avi_infoframe(struct mtk_hd=
mi *hdmi,
>                                         struct drm_display_mode *mode)
>  {
>         struct hdmi_avi_infoframe frame;
> -       u8 buffer[17];
> +       u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
>         ssize_t err;
>
>         err =3D drm_hdmi_avi_infoframe_from_display_mode(&frame,
> @@ -1008,7 +1008,7 @@ static int mtk_hdmi_setup_spd_infoframe(struct mtk_=
hdmi *hdmi,
>                                         const char *product)
>  {
>         struct hdmi_spd_infoframe frame;
> -       u8 buffer[29];
> +       u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_SPD_INFOFRAME_SIZE];
>         ssize_t err;
>
>         err =3D hdmi_spd_infoframe_init(&frame, vendor, product);
> @@ -1031,7 +1031,7 @@ static int mtk_hdmi_setup_spd_infoframe(struct mtk_=
hdmi *hdmi,
>  static int mtk_hdmi_setup_audio_infoframe(struct mtk_hdmi *hdmi)
>  {
>         struct hdmi_audio_infoframe frame;
> -       u8 buffer[14];
> +       u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AUDIO_INFOFRAME_SIZE]=
;
>         ssize_t err;
>
>         err =3D hdmi_audio_infoframe_init(&frame);
> --
> 2.26.2
>
>
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