drm/amdgpu: check mmhub_funcs pointer before refering to it

mmhub callback functions are not initialized for all the ASICs

Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 420dcdd..08a47a5 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -799,7 +799,7 @@ static int gmc_v9_0_ecc_late_init(void *handle)
                        goto umc_late_fini;
        }
 
-       if (adev->mmhub_funcs->ras_late_init) {
+       if (adev->mmhub_funcs && adev->mmhub_funcs->ras_late_init) {
                r = adev->mmhub_funcs->ras_late_init(adev);
                if (r)
                        return r;