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drm/amdgpu: check hive pointer before access

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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>
This commit is contained in:
Hawking Zhang 2020-09-05 23:11:17 +08:00 • committed by Alex Deucher
parent 3f66bf401e
commit a9f5f98f79
1 changed files with 9 additions and 4 deletions
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13
drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
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@ -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;