linux-kernel - Re: [PATCH] drm/amdgpu: remove unreachable code

Open Source and information security mailing list archives

Date:   Tue, 25 May 2021 17:27:25 +0200
From:   Christian König <ckoenig.leichtzumerken@...il.com>
To:     Alex Deucher <alexdeucher@...il.com>,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Cc:     Dave Airlie <airlied@...ux.ie>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        "moderated list:DMA BUFFER SHARING FRAMEWORK" 
        <linaro-mm-sig@...ts.linaro.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        "Deucher, Alexander" <alexander.deucher@....com>,
        Christian Koenig <christian.koenig@....com>,
        linux-media <linux-media@...r.kernel.org>
Subject: Re: [PATCH] drm/amdgpu: remove unreachable code

Am 24.05.21 um 20:48 schrieb Alex Deucher:
> Applied.  Thanks!

Ok, that's unfortunate.

IIRC we added the code because of a different compiler warning.

Christian.

>
> Alex
>
> On Mon, May 24, 2021 at 6:47 AM Jiapeng Chong
> <jiapeng.chong@...ux.alibaba.com> wrote:
>> In the function amdgpu_uvd_cs_msg(), every branch in the switch
>> statement will have a return, so the code below the switch statement
>> will not be executed.
>>
>> Eliminate the follow smatch warning:
>>
>> drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c:845 amdgpu_uvd_cs_msg() warn:
>> ignoring unreachable code.
>>
>> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
>> Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c | 2 --
>>   1 file changed, 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
>> index 82f0542..375b346 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
>> @@ -842,8 +842,6 @@ static int amdgpu_uvd_cs_msg(struct amdgpu_uvd_cs_ctx *ctx,
>>                  DRM_ERROR("Illegal UVD message type (%d)!\n", msg_type);
>>                  return -EINVAL;
>>          }
>> -       BUG();
>> -       return -EINVAL;
>>   }
>>
>>   /**
>> --
>> 1.8.3.1
>>
> _______________________________________________
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> amd-gfx@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx

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