From 77557d8d9f87767ec8f42d2e4f456986dc9749c8 Mon Sep 17 00:00:00 2001
From: Lingao Meng <menglingao@xiaomi.com>
Date: Thu, 23 Jun 2022 14:33:30 +0800
Subject: [PATCH] drivers: serial: Add error for insuff buffer

Signed-off-by: Lingao Meng <menglingao@xiaomi.com>
---
 drivers/serial/uart_bth4.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/serial/uart_bth4.c b/drivers/serial/uart_bth4.c
index c63af7e3ef..f5c68ee62f 100644
--- a/drivers/serial/uart_bth4.c
+++ b/drivers/serial/uart_bth4.c
@@ -174,6 +174,10 @@ static int uart_bth4_receive(FAR struct bt_driver_s *drv,
           uart_bth4_pollnotify(dev, POLLIN);
         }
     }
+  else
+    {
+      ret = -ENOMEM;
+    }
 
   leave_critical_section(flags);
   return ret;