drm/amd/pm: avoid potential UBSAN issue on legacy asics

Prevent further dpm casting on legacy asics without od_enabled in
amdgpu_dpm_is_overdrive_supported. This can avoid UBSAN complain
in init sequence.

v2: add a macro to check legacy dpm instead of checking asic family/type
v3: refine macro name for naming consistency

Suggested-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
index 86246f6..078aaaa 100644 (file)
--- a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
@@ -36,6 +36,8 @@
 #define amdgpu_dpm_enable_bapm(adev, e) \
                ((adev)->powerplay.pp_funcs->enable_bapm((adev)->powerplay.pp_handle, (e)))
 
+#define amdgpu_dpm_is_legacy_dpm(adev) ((adev)->powerplay.pp_handle == (adev))
+
 int amdgpu_dpm_get_sclk(struct amdgpu_device *adev, bool low)
 {
        const struct amd_pm_funcs *pp_funcs = adev->powerplay.pp_funcs;
@@ -1467,8 +1469,11 @@ int amdgpu_dpm_is_overdrive_supported(struct amdgpu_device *adev)
        } else {
                struct pp_hwmgr *hwmgr;
 
-               /* SI asic does not carry od_enabled */
-               if (adev->family == AMDGPU_FAMILY_SI)
+               /*
+                * dpm on some legacy asics don't carry od_enabled member
+                * as its pp_handle is casted directly from adev.
+                */
+               if (amdgpu_dpm_is_legacy_dpm(adev))
                        return false;
 
                hwmgr = (struct pp_hwmgr *)adev->powerplay.pp_handle;