From c99dfc3147ef08ef62e729dc2860e06ad90380d3 Mon Sep 17 00:00:00 2001
From: liukangcc <liukangcc@outlook.com>
Date: Wed, 13 Oct 2021 18:04:46 +0800
Subject: [PATCH] =?UTF-8?q?[update]=20fix=20finsh=5Fgetchar()=20=E6=9C=AA?=
 =?UTF-8?q?=E5=AF=B9=20shell->device=20=E4=B8=BA=E7=A9=BA=E5=A4=84?=
 =?UTF-8?q?=E7=90=86=E7=9A=84=E9=97=AE=E9=A2=98?=
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---
 components/finsh/shell.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/components/finsh/shell.c b/components/finsh/shell.c
index 48651d2c4f..7b577db6b6 100644
--- a/components/finsh/shell.c
+++ b/components/finsh/shell.c
@@ -151,15 +151,19 @@ char finsh_getchar(void)
     char ch = 0;
 
     RT_ASSERT(shell != RT_NULL);
+    if (shell->device == RT_NULL)
+    {
+        return -RT_ERROR;
+    }
     while (rt_device_read(shell->device, -1, &ch, 1) != 1)
         rt_sem_take(&shell->rx_sem, RT_WAITING_FOREVER);
 
     return ch;
-#endif
+#endif /* RT_USING_POSIX */
 #else
     extern char rt_hw_console_getchar(void);
     return rt_hw_console_getchar();
-#endif
+#endif /* RT_USING_DEVICE */
 }
 
 #if !defined(RT_USING_POSIX) && defined(RT_USING_DEVICE)