From 2f402db661072d79c71ffdee1bb71cee30d86655 Mon Sep 17 00:00:00 2001
From: liang yongxiang <tanekliang@gmail.com>
Date: Sat, 21 Jul 2018 12:34:27 +0800
Subject: [PATCH] [device][serial] call rx_indicate function only if the
 rx_length is not equal 0

---
 components/drivers/serial/serial.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/components/drivers/serial/serial.c b/components/drivers/serial/serial.c
index f94b7eda0..856e33e97 100644
--- a/components/drivers/serial/serial.c
+++ b/components/drivers/serial/serial.c
@@ -1180,7 +1180,10 @@ void rt_hw_serial_isr(struct rt_serial_device *serial, int event)
                     (serial->config.bufsz - (rx_fifo->get_index - rx_fifo->put_index));
                 rt_hw_interrupt_enable(level);
 
-                serial->parent.rx_indicate(&serial->parent, rx_length);
+                if (rx_length)
+                {
+                    serial->parent.rx_indicate(&serial->parent, rx_length);
+                }
             }
             break;
         }
-- 
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