can: xilinx_can: Add check for NAPI Poll function

Add check for NAPI poll function to avoid enabling interrupts
with out completing the NAPI call.

Link: https://lore.kernel.org/all/20220208162053.39896-1-srinivas.neeli@xilinx.comSigned-off-by: NSrinivas Neeli <srinivas.neeli@xilinx.com>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/xilinx_can.c

@@ -1215,10 +1215,11 @@ static int xcan_rx_poll(struct napi_struct *napi, int quota)
 	}
 
 	if (work_done < quota) {
-		napi_complete_done(napi, work_done);
-		ier = priv->read_reg(priv, XCAN_IER_OFFSET);
-		ier |= xcan_rx_int_mask(priv);
-		priv->write_reg(priv, XCAN_IER_OFFSET, ier);
+		if (napi_complete_done(napi, work_done)) {
+			ier = priv->read_reg(priv, XCAN_IER_OFFSET);
+			ier |= xcan_rx_int_mask(priv);
+			priv->write_reg(priv, XCAN_IER_OFFSET, ier);
+		}
 	}
 	return work_done;
 }