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Alexander" , "Zhu, James" , "Liu, Leo" , "Koenig, Christian" X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: "Dong, Ruijing via Linux-kernel-mentees" Reply-To: "Dong, Ruijing" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" [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? 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); continue; } /* wait for vcn idle */ r = SOC15_WAIT_ON_RREG(VCN, i, regUVD_STATUS, UVD_STATUS__IDLE, 0x7); Thanks Ruijing -----Original Message----- From: Khalid Masum Sent: Monday, August 15, 2022 11:11 AM To: Dong, Ruijing ; amd-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; linux-kernel@vger.kernel.org; linux-kernel-mentees@lists.linuxfoundation.org Cc: Deucher, Alexander ; Koenig, Christian ; Pan, Xinhui ; David Airlie ; Daniel Vetter ; Zhu, James ; Jiang, Sonny ; Wan Jiabing ; Liu, Leo Subject: Re: [PATCH linux-next] drm/amdgpu/vcn: Remove unused assignment in vcn_v4_0_stop On 8/15/22 20:15, Dong, Ruijing wrote: > [AMD Official Use Only - General] > > Sorry, which "r" value was overwritten? I didn't see the point of making this change. > > Thanks > Ruijing > > -----Original Message----- > From: Khalid Masum > Sent: Monday, August 15, 2022 3:01 AM > To: amd-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; > linux-kernel@vger.kernel.org; > linux-kernel-mentees@lists.linuxfoundation.org > Cc: Deucher, Alexander ; Koenig, Christian > ; Pan, Xinhui ; David > Airlie ; Daniel Vetter ; Zhu, James > ; Jiang, Sonny ; Dong, Ruijing > ; Wan Jiabing ; Liu, Leo > ; Khalid Masum > Subject: [PATCH linux-next] drm/amdgpu/vcn: Remove unused assignment > in vcn_v4_0_stop > > The value assigned from vcn_v4_0_stop_dbg_mode to r is overwritten before it can be used. Remove this assignment. > > Addresses-Coverity: 1504988 ("Unused value") > Fixes: 8da1170a16e4 ("drm/amdgpu: add VCN4 ip block support") > Signed-off-by: Khalid Masum > --- > drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c > b/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c > index ca14c3ef742e..80b8a2c66b36 100644 > --- a/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c > +++ b/drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c > @@ -1154,7 +1154,7 @@ static int vcn_v4_0_stop(struct amdgpu_device *adev) > fw_shared->sq.queue_mode |= FW_QUEUE_DPG_HOLD_OFF; > > if (adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) { > - r = vcn_v4_0_stop_dpg_mode(adev, i); > + vcn_v4_0_stop_dpg_mode(adev, i); > continue; > } > > -- > 2.37.1 > After value is overwritten soon right after the diff. See: drivers/gpu/drm/amd/amdgpu/vcn_v4_0.c static int vcn_v4_0_stop(struct amdgpu_device *adev) { volatile struct amdgpu_vcn4_fw_shared *fw_shared; ... for (i = 0; i < adev->vcn.num_vcn_inst; ++i) { fw_shared = adev->vcn.inst[i].fw_shared.cpu_addr; fw_shared->sq.queue_mode |= FW_QUEUE_DPG_HOLD_OFF; if (adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) { r = vcn_v4_0_stop_dpg_mode(adev, i); continue; } /* wait for vcn idle */ r = SOC15_WAIT_ON_RREG(VCN, i, regUVD_STATUS, UVD_STATUS__IDLE, 0x7); Here, any value assigned to r is overwritten before it could be used. So the assignment in the true branch of the if statement here can be removed. Thanks, -- Khalid Masum _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0E932C25B0E for ; Mon, 15 Aug 2022 15:18:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9C5C3CB823; Mon, 15 Aug 2022 15:18:28 +0000 (UTC) Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2040.outbound.protection.outlook.com [40.107.236.40]) by gabe.freedesktop.org (Postfix) with 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