[PATCH] drm/amdgpu: check sdma ras funcs pointer before accessing

[Hawking Zhang]

sdma ras funcs are not supported by ASIC prior
to vega20

Signed-off-by: Hawking Zhang <Hawking.Zhang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
index f4107f9b75f3..c4b4caaf56fe 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
@@ -1810,7 +1810,10 @@ static int sdma_v4_0_late_init(void *handle)
 			RREG32_SDMA(i, mmSDMA0_EDC_COUNTER);
 	}
 
-	return adev->sdma.funcs->ras_late_init(adev, &ih_info);
+	if (adev->sdma.funcs && adev->sdma.funcs->ras_late_init)
+		return adev->sdma.funcs->ras_late_init(adev, &ih_info);
+	else
+		return 0;
 }
 
 static int sdma_v4_0_sw_init(void *handle)
@@ -1882,7 +1885,8 @@ static int sdma_v4_0_sw_fini(void *handle)
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 	int i;
 
-	adev->sdma.funcs->ras_fini(adev);
+	if (adev->sdma.funcs && adev->sdma.funcs->ras_fini)
+		adev->sdma.funcs->ras_fini(adev);
 
 	for (i = 0; i < adev->sdma.num_instances; i++) {
 		amdgpu_ring_fini(&adev->sdma.instance[i].ring);
-- 
2.17.1