diff --git a/components/dfs/src/dfs.c b/components/dfs/src/dfs.c
index 4e38615ba756d675f5710ef412221012dd42c8a8..7e56137abab4447a395ae31aba4985c7101a9901 100644
--- a/components/dfs/src/dfs.c
+++ b/components/dfs/src/dfs.c
@@ -234,7 +234,11 @@ int fd_is_open(const char *pathname)
             mountpath = fullpath + strlen(fs->path);
 
         dfs_lock();
+#ifdef DFS_USING_STDIO
+        for (index = 3; index < DFS_FD_MAX+3; index++)
+#else
         for (index = 0; index < DFS_FD_MAX; index++)
+#endif
         {
             fd = &(fd_table[index]);
             if (fd->fs == RT_NULL)
diff --git a/components/drivers/src/ringbuffer.c b/components/drivers/src/ringbuffer.c
index 6212b10258a8d2b85a414293a6afbef24bb9dd6c..8c2705ceb11535d32293dd8bf091336489e52496 100644
--- a/components/drivers/src/ringbuffer.c
+++ b/components/drivers/src/ringbuffer.c
@@ -100,13 +100,13 @@ rt_size_t rt_ringbuffer_put_force(struct rt_ringbuffer *rb,
                             const rt_uint8_t     *ptr,
                             rt_uint16_t           length)
 {
-    enum rt_ringbuffer_state old_state;
+    rt_uint16_t space_length;
 
     RT_ASSERT(rb != RT_NULL);
 
-    old_state = rt_ringbuffer_status(rb);
+    space_length = rt_ringbuffer_space_len(rb);
 
-    if (length > rb->buffer_size)
+    if (length > space_length)
         length = rb->buffer_size;
 
     if (rb->buffer_size - rb->write_index > length)
@@ -117,7 +117,7 @@ rt_size_t rt_ringbuffer_put_force(struct rt_ringbuffer *rb,
          * length of data in current mirror */
         rb->write_index += length;
 
-        if (old_state == RT_RINGBUFFER_FULL)
+        if (length > space_length)
             rb->read_index = rb->write_index;
 
         return length;
@@ -134,7 +134,7 @@ rt_size_t rt_ringbuffer_put_force(struct rt_ringbuffer *rb,
     rb->write_mirror = ~rb->write_mirror;
     rb->write_index = length - (rb->buffer_size - rb->write_index);
 
-    if (old_state == RT_RINGBUFFER_FULL)
+    if (length > space_length)
     {
         rb->read_mirror = ~rb->read_mirror;
         rb->read_index = rb->write_index;