[SRU][N][PATCH 1/2] drm/amdgpu: validate the flush_gpu_tlb_pasid()

[AceLan Kao]

From: Prike Liang <Prike.Liang at amd.com>

BugLink: https://bugs.launchpad.net/bugs/2144577

Validate flush_gpu_tlb_pasid() availability before flushing tlb.

Signed-off-by: Prike Liang <Prike.Liang at amd.com>
Reviewed-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
(cherry picked from commit f4db9913e4d3dabe9ff3ea6178f2c1bc286012b8)
Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao at canonical.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 f311aaaa5acc2..7861b35db0029 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -695,6 +695,10 @@ 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,
-- 
2.53.0