[PATCH] drm/amdgpu: validate the flush_gpu_tlb_pasid()

[Prike Liang]

Validate flush_gpu_tlb_pasid() availability before flushing tlb.

Signed-off-by: Prike Liang <prike.li...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index cd4acc6adc9e..f871f1693483 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -780,6 +780,10 @@ int amdgpu_gmc_flush_gpu_tlb_pasid(struct amdgpu_device 
*adev, uint16_t pasid,
                return 0;
 
        if (!adev->gmc.flush_pasid_uses_kiq || !ring->sched.ready) {
+
+               if (!adev->gmc.gmc_funcs->flush_gpu_tlb_pasid)
+                       return 0;
+
                if (adev->gmc.flush_tlb_needs_extra_type_2)
                        adev->gmc.gmc_funcs->flush_gpu_tlb_pasid(adev, pasid,
                                                                 2, all_hub,
-- 
2.34.1