drm/amdgpu: print warning and taint kernel if lockup timeout is disabled

Make sure that we notice this in error reports.
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -3324,6 +3324,8 @@ static int amdgpu_device_get_job_timeout_settings(struct amdgpu_device *adev)
 				continue;
 			} else if (timeout < 0) {
 				timeout = MAX_SCHEDULE_TIMEOUT;
+				dev_warn(adev->dev, "lockup timeout disabled");
+				add_taint(TAINT_SOFTLOCKUP, LOCKDEP_STILL_OK);
 			} else {
 				timeout = msecs_to_jiffies(timeout);
 			}