From 2915e43a033a778816fa4bc621f033576796521e Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Mon, 6 Mar 2023 10:35:34 -0500
Subject: [PATCH] drm/amdgpu: fix error checking in amdgpu_read_mm_registers for soc21
Git-commit: 2915e43a033a778816fa4bc621f033576796521e
Patch-mainline: v6.3-rc2
References: bsc#1206843
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
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/amd/amdgpu/soc21.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/soc21.c b/drivers/gpu/drm/amd/amdgpu/soc21.c
index 620f7409825d..9df2236007ab 100644
--- a/drivers/gpu/drm/amd/amdgpu/soc21.c
+++ b/drivers/gpu/drm/amd/amdgpu/soc21.c
@@ -291,9 +291,10 @@ static int soc21_read_register(struct amdgpu_device *adev, u32 se_num,
*value = 0;
for (i = 0; i < ARRAY_SIZE(soc21_allowed_read_registers); i++) {
en = &soc21_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 = soc21_get_register_value(adev,
--
2.35.3