[PATCH linux-next] drm/amdgpu/vcn: Remove unused assignment in vcn_v4_0_stop

[Dong, Ruijing]

[AMD Official Use Only - General]

Then please update commit message, this change is due to "value r is never used, and remove unnecessary assignment", that makes sense to me.

Thanks
Ruijing

-----Original Message-----
From: Khalid Masum <khalid.masum.92 at gmail.com>
Sent: Monday, August 15, 2022 11:54 AM
To: Dong, Ruijing <Ruijing.Dong at amd.com>; amd-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org; linux-kernel at vger.kernel.org; linux-kernel-mentees at lists.linuxfoundation.org
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>; Pan, Xinhui <Xinhui.Pan at amd.com>; David Airlie <airlied at linux.ie>; Daniel Vetter <daniel at ffwll.ch>; Zhu, James <James.Zhu at amd.com>; Jiang, Sonny <Sonny.Jiang at amd.com>; Wan Jiabing <wanjiabing at vivo.com>; Liu, Leo <Leo.Liu at amd.com>
Subject: Re: [PATCH linux-next] drm/amdgpu/vcn: Remove unused assignment in vcn_v4_0_stop

On 8/15/22 21:17, Dong, Ruijing wrote:
> [AMD Official Use Only - General]
>
> If the condition was met and it came to execute vcn_4_0_stop_dpg_mode, then it would never have a chance to go for /*wait for vcn idle*/, isn't it?

Hypothetically, some other thread might set adev->pg_flags NULL and in that case it will get the chance to go for /* wait for vcn idle */.


> I still didn't see obvious purpose of this change.
>
>                  if (adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) {
>       ==>              r = vcn_v4_0_stop_dpg_mode(adev, i);

Regardless of that, this assignment to r is unnecessary. Because this
value of r is never used. This patch simply removes this unnecessary
assignment.

>                           continue;
>                   }
>
>                   /* wait for vcn idle */
>                   r = SOC15_WAIT_ON_RREG(VCN, i, regUVD_STATUS, UVD_STATUS__IDLE, 0x7);
>
> Thanks
> Ruijing
>

Thanks,
   -- Khalid Masum