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

[Guchun Chen]

Prevent further casting on chip MULLINS/KABINI/KAVERI when calling
amdgpu_dpm_is_overdrive_supported, this can avoid UBSAN complain
in init sequence.

Suggested-by: Evan Quan <evan.quan at amd.com>
Signed-off-by: Guchun Chen <guchun.chen at amd.com>
---
 drivers/gpu/drm/amd/pm/amdgpu_dpm.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
index 86246f69dbe1..ccd3ea89eacf 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
@@ -1467,8 +1467,14 @@ 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)
+		/*
+		 * SI asic and chip MULLINS/KABINI/KAVERI do not carry
+		 * od_enabled, as its pp_handle is casted from adev.
+		 */
+		if ((adev->family == AMDGPU_FAMILY_SI) ||
+		    (adev->asic_type == CHIP_MULLINS) ||
+		    (adev->asic_type == CHIP_KABINI) ||
+		    (adev->asic_type == CHIP_KAVERI))
 			return false;
 
 		hwmgr = (struct pp_hwmgr *)adev->powerplay.pp_handle;
-- 
2.25.1