From 619fa4d9d8ef12ae11744d412ae00805796fb4b5 Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Sat, 31 Jul 2021 01:37:53 +0800
Subject: [PATCH] =?UTF-8?q?[ringbuffer]=20=E9=87=87=E7=94=A8=E5=B1=80?=
 =?UTF-8?q?=E9=83=A8=E5=8F=98=E9=87=8F=EF=BC=8C=E9=98=B2=E6=AD=A2=E5=87=BA?=
 =?UTF-8?q?=E7=8E=B0=E8=B5=84=E6=BA=90=E7=AB=9E=E4=BA=89?=
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---
 components/drivers/src/ringbuffer.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/components/drivers/src/ringbuffer.c b/components/drivers/src/ringbuffer.c
index 29de20b087..8d26fc45da 100644
--- a/components/drivers/src/ringbuffer.c
+++ b/components/drivers/src/ringbuffer.c
@@ -333,11 +333,15 @@ rt_size_t rt_ringbuffer_data_len(struct rt_ringbuffer *rb)
         return rb->buffer_size;
     case RT_RINGBUFFER_HALFFULL:
     default:
-        if (rb->write_index > rb->read_index)
-            return rb->write_index - rb->read_index;
+    {
+        rt_size_t wi = rb->write_index, ri = rb->read_index;
+
+        if (wi > ri)
+            return wi - ri;
         else
-            return rb->buffer_size - (rb->read_index - rb->write_index);
-    };
+            return rb->buffer_size - (ri - wi);
+    }
+    }
 }
 RTM_EXPORT(rt_ringbuffer_data_len);
 
-- 
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