[PATCH AUTOSEL 5.10 075/217] drm/amdgpu: check hive pointer before access

Sasha Levin
2020-12-23T03:07:14Z

From: Hawking Zhang <Hawking.Zhang@amd.com>

[ Upstream commit a9f5f98f796ee93a865b9886bf7cb694cf124eb5 ]

in case it is an invalid one

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
index 1162913c8bf42..ffb74fba9d867 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
@@ -395,12 +395,17 @@ void amdgpu_put_xgmi_hive(struct amdgpu_hive_info *hive)
int amdgpu_xgmi_set_pstate(struct amdgpu_device *adev, int pstate)
{
int ret = 0;
- struct amdgpu_hive_info *hive = amdgpu_get_xgmi_hive(adev);
- struct amdgpu_device *request_adev = hive->hi_req_gpu ?
- hive->hi_req_gpu : adev;
+ struct amdgpu_hive_info *hive;
+ struct amdgpu_device *request_adev;
bool is_hi_req = pstate == AMDGPU_XGMI_PSTATE_MAX_VEGA20;
- bool init_low = hive->pstate == AMDGPU_XGMI_PSTATE_UNKNOWN;
+ bool init_low;
+
+ hive = amdgpu_get_xgmi_hive(adev);
+ if (!hive)
+ return 0;

+ request_adev = hive->hi_req_gpu ? hive->hi_req_gpu : adev;
+ init_low = hive->pstate == AMDGPU_XGMI_PSTATE_UNKNOWN;
amdgpu_put_xgmi_hive(hive);
/* fw bug so temporarily disable pstate switching */
return 0;
--
2.27.0