habanalabs: check TPC vector pipe is empty

The driver waits for the TPC vector pipe to be empty before checking if the
TPC kernel has finished executing, but the code doesn't validate that the
pipe was indeed empty, it just wait for it without checking the return
value.
Reported-by: Nkernel test robot <lkp@intel.com>
Reviewed-by: NTomer Tayar <ttayar@habana.ai>
Signed-off-by: NOded Gabbay <oded.gabbay@gmail.com>

drivers/misc/habanalabs/gaudi/gaudi.c

@@ -6304,6 +6304,15 @@ static int gaudi_run_tpc_kernel(struct hl_device *hdev, u64 tpc_kernel,
 		1000,
 		kernel_timeout);
 
+	if (rc) {
+		dev_err(hdev->dev,
+			"Timeout while waiting for TPC%d vector pipe\n",
+			tpc_id);
+		hdev->asic_funcs->set_clock_gating(hdev);
+		mutex_unlock(&gaudi->clk_gate_mutex);
+		return -EIO;
+	}
+
 	rc = hl_poll_timeout(
 		hdev,
 		mmTPC0_CFG_WQ_INFLIGHT_CNTR + offset,