linux-kernel - Re: [PATCH 1/3] gpu: drm: dead code elimination

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Date:   Wed, 18 Dec 2019 15:11:24 -0500
From:   Alex Deucher <alexdeucher@...il.com>
To:     Pan Zhang <zhangpan26@...wei.com>
Cc:     hushiyuan@...wei.com,
        "Deucher, Alexander" <alexander.deucher@....com>,
        Christian Koenig <christian.koenig@....com>,
        Chunming Zhou <David1.Zhou@....com>,
        Dave Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] gpu: drm: dead code elimination

On Wed, Dec 18, 2019 at 3:13 AM Pan Zhang <zhangpan26@...wei.com> wrote:
>
> this set adds support for removal of gpu drm dead code.
>
> patch1:
> `num` is a data of u8 type and ATOM_MAX_HW_I2C_READ == 255,
>
> so there is a impossible condition '(num > 255) => (0-255 > 255)'.
>
> Signed-off-by: Pan Zhang <zhangpan26@...wei.com>

This change was already made by someone else.

Alex

> ---
>  drivers/gpu/drm/amd/amdgpu/atombios_i2c.c | 5 -----
>  1 file changed, 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_i2c.c b/drivers/gpu/drm/amd/amdgpu/atombios_i2c.c
> index 980c363..b4cc7c5 100644
> --- a/drivers/gpu/drm/amd/amdgpu/atombios_i2c.c
> +++ b/drivers/gpu/drm/amd/amdgpu/atombios_i2c.c
> @@ -76,11 +76,6 @@ static int amdgpu_atombios_i2c_process_i2c_ch(struct amdgpu_i2c_chan *chan,
>                 }
>                 args.lpI2CDataOut = cpu_to_le16(out);
>         } else {
> -               if (num > ATOM_MAX_HW_I2C_READ) {
> -                       DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num);
> -                       r = -EINVAL;
> -                       goto done;
> -               }
>                 args.ucRegIndex = 0;
>                 args.lpI2CDataOut = 0;
>         }
> --
> 2.7.4
>
> _______________________________________________
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> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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