From: Alex Deucher <alexander.deucher@amd.com>
Date: Tue, 7 Mar 2023 08:59:13 -0500
Subject: [PATCH] drm/amdgpu: fix error checking in amdgpu_read_mm_registers
 for nv
References: bsc#1012628
Patch-mainline: 6.2.7
Git-commit: b42fee5e0b44344cfe4c38e61341ee250362c83f

commit b42fee5e0b44344cfe4c38e61341ee250362c83f upstream.

Properly skip non-existent registers as well.

Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2442
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/gpu/drm/amd/amdgpu/nv.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/nv.c b/drivers/gpu/drm/amd/amdgpu/nv.c
index 6853b93a..df3388e8 100644
--- a/drivers/gpu/drm/amd/amdgpu/nv.c
+++ b/drivers/gpu/drm/amd/amdgpu/nv.c
@@ -393,9 +393,10 @@ static int nv_read_register(struct amdgpu_device *adev, u32 se_num,
 	*value = 0;
 	for (i = 0; i < ARRAY_SIZE(nv_allowed_read_registers); i++) {
 		en = &nv_allowed_read_registers[i];
-		if (adev->reg_offset[en->hwip][en->inst] &&
-		    reg_offset != (adev->reg_offset[en->hwip][en->inst][en->seg]
-				   + en->reg_offset))
+		if (!adev->reg_offset[en->hwip][en->inst])
+			continue;
+		else if (reg_offset != (adev->reg_offset[en->hwip][en->inst][en->seg]
+					+ en->reg_offset))
 			continue;
 
 		*value = nv_get_register_value(adev,
-- 
2.35.3