drm/amdgpu: Add NULL checks for function pointers

Check if function is implemented before making the call.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/soc15.c

@@ -1423,8 +1423,10 @@ static void soc15_common_get_clockgating_state(void *handle, u64 *flags)
 	if (amdgpu_sriov_vf(adev))
 		*flags = 0;
 
+	if (adev->nbio.funcs && adev->nbio.funcs->get_clockgating_state)
 		adev->nbio.funcs->get_clockgating_state(adev, flags);
 
+	if (adev->hdp.funcs && adev->hdp.funcs->get_clock_gating_state)
 		adev->hdp.funcs->get_clock_gating_state(adev, flags);
 
 	if (amdgpu_ip_version(adev, MP0_HWIP, 0) != IP_VERSION(13, 0, 2)) {
@@ -1440,8 +1442,10 @@ static void soc15_common_get_clockgating_state(void *handle, u64 *flags)
 	}
 
 	/* AMD_CG_SUPPORT_ROM_MGCG */
+	if (adev->smuio.funcs && adev->smuio.funcs->get_clock_gating_state)
 		adev->smuio.funcs->get_clock_gating_state(adev, flags);
 
+	if (adev->df.funcs && adev->df.funcs->get_clockgating_state)
 		adev->df.funcs->get_clockgating_state(adev, flags);
 }